diff options
Diffstat (limited to 'arch/microblaze/kernel')
36 files changed, 8134 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/.gitignore b/arch/microblaze/kernel/.gitignore new file mode 100644 index 000000000..c5f676c3c --- /dev/null +++ b/arch/microblaze/kernel/.gitignore @@ -0,0 +1 @@ +vmlinux.lds diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile new file mode 100644 index 000000000..dd7163743 --- /dev/null +++ b/arch/microblaze/kernel/Makefile @@ -0,0 +1,30 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile +# + +ifdef CONFIG_FUNCTION_TRACER +# Do not trace early boot code and low level code +CFLAGS_REMOVE_timer.o = -pg +CFLAGS_REMOVE_intc.o = -pg +CFLAGS_REMOVE_early_printk.o = -pg +CFLAGS_REMOVE_ftrace.o = -pg +CFLAGS_REMOVE_process.o = -pg +endif + +extra-y := head.o vmlinux.lds + +obj-y += dma.o exceptions.o \ + hw_exception_handler.o irq.o \ + process.o prom.o ptrace.o \ + reset.o setup.o signal.o sys_microblaze.o timer.o traps.o unwind.o + +obj-y += cpu/ + +obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o +obj-$(CONFIG_MMU) += misc.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o +obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount.o +obj-$(CONFIG_KGDB) += kgdb.o + +obj-y += entry$(MMU).o diff --git a/arch/microblaze/kernel/asm-offsets.c b/arch/microblaze/kernel/asm-offsets.c new file mode 100644 index 000000000..c1b459c97 --- /dev/null +++ b/arch/microblaze/kernel/asm-offsets.c @@ -0,0 +1,128 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/stddef.h> +#include <linux/sched.h> +#include <linux/kernel_stat.h> +#include <linux/ptrace.h> +#include <linux/hardirq.h> +#include <linux/thread_info.h> +#include <linux/kbuild.h> +#include <asm/cpuinfo.h> + +int main(int argc, char *argv[]) +{ + /* struct pt_regs */ + DEFINE(PT_SIZE, sizeof(struct pt_regs)); + DEFINE(PT_MSR, offsetof(struct pt_regs, msr)); + DEFINE(PT_EAR, offsetof(struct pt_regs, ear)); + DEFINE(PT_ESR, offsetof(struct pt_regs, esr)); + DEFINE(PT_FSR, offsetof(struct pt_regs, fsr)); + DEFINE(PT_PC, offsetof(struct pt_regs, pc)); + DEFINE(PT_R0, offsetof(struct pt_regs, r0)); + DEFINE(PT_R1, offsetof(struct pt_regs, r1)); + DEFINE(PT_R2, offsetof(struct pt_regs, r2)); + DEFINE(PT_R3, offsetof(struct pt_regs, r3)); + DEFINE(PT_R4, offsetof(struct pt_regs, r4)); + DEFINE(PT_R5, offsetof(struct pt_regs, r5)); + DEFINE(PT_R6, offsetof(struct pt_regs, r6)); + DEFINE(PT_R7, offsetof(struct pt_regs, r7)); + DEFINE(PT_R8, offsetof(struct pt_regs, r8)); + DEFINE(PT_R9, offsetof(struct pt_regs, r9)); + DEFINE(PT_R10, offsetof(struct pt_regs, r10)); + DEFINE(PT_R11, offsetof(struct pt_regs, r11)); + DEFINE(PT_R12, offsetof(struct pt_regs, r12)); + DEFINE(PT_R13, offsetof(struct pt_regs, r13)); + DEFINE(PT_R14, offsetof(struct pt_regs, r14)); + DEFINE(PT_R15, offsetof(struct pt_regs, r15)); + DEFINE(PT_R16, offsetof(struct pt_regs, r16)); + DEFINE(PT_R17, offsetof(struct pt_regs, r17)); + DEFINE(PT_R18, offsetof(struct pt_regs, r18)); + DEFINE(PT_R19, offsetof(struct pt_regs, r19)); + DEFINE(PT_R20, offsetof(struct pt_regs, r20)); + DEFINE(PT_R21, offsetof(struct pt_regs, r21)); + DEFINE(PT_R22, offsetof(struct pt_regs, r22)); + DEFINE(PT_R23, offsetof(struct pt_regs, r23)); + DEFINE(PT_R24, offsetof(struct pt_regs, r24)); + DEFINE(PT_R25, offsetof(struct pt_regs, r25)); + DEFINE(PT_R26, offsetof(struct pt_regs, r26)); + DEFINE(PT_R27, offsetof(struct pt_regs, r27)); + DEFINE(PT_R28, offsetof(struct pt_regs, r28)); + DEFINE(PT_R29, offsetof(struct pt_regs, r29)); + DEFINE(PT_R30, offsetof(struct pt_regs, r30)); + DEFINE(PT_R31, offsetof(struct pt_regs, r31)); + DEFINE(PT_MODE, offsetof(struct pt_regs, pt_mode)); + BLANK(); + + /* Magic offsets for PTRACE PEEK/POKE etc */ + DEFINE(PT_TEXT_ADDR, sizeof(struct pt_regs) + 1); + DEFINE(PT_TEXT_LEN, sizeof(struct pt_regs) + 2); + DEFINE(PT_DATA_ADDR, sizeof(struct pt_regs) + 3); + BLANK(); + + /* struct task_struct */ + DEFINE(TS_THREAD_INFO, offsetof(struct task_struct, stack)); +#ifdef CONFIG_MMU + DEFINE(TASK_STATE, offsetof(struct task_struct, state)); + DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags)); + DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace)); + DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked)); + DEFINE(TASK_MM, offsetof(struct task_struct, mm)); + DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm)); + DEFINE(TASK_PID, offsetof(struct task_struct, pid)); + DEFINE(TASK_THREAD, offsetof(struct task_struct, thread)); + DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp)); + BLANK(); + + DEFINE(PGDIR, offsetof(struct thread_struct, pgdir)); + BLANK(); +#endif + + /* struct thread_info */ + DEFINE(TI_TASK, offsetof(struct thread_info, task)); + DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); + DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit)); + DEFINE(TI_CPU_CONTEXT, offsetof(struct thread_info, cpu_context)); + DEFINE(TI_PREEMPT_COUNT, offsetof(struct thread_info, preempt_count)); + BLANK(); + + /* struct cpu_context */ + DEFINE(CC_R1, offsetof(struct cpu_context, r1)); /* r1 */ + DEFINE(CC_R2, offsetof(struct cpu_context, r2)); + /* dedicated registers */ + DEFINE(CC_R13, offsetof(struct cpu_context, r13)); + DEFINE(CC_R14, offsetof(struct cpu_context, r14)); + DEFINE(CC_R15, offsetof(struct cpu_context, r15)); + DEFINE(CC_R16, offsetof(struct cpu_context, r16)); + DEFINE(CC_R17, offsetof(struct cpu_context, r17)); + DEFINE(CC_R18, offsetof(struct cpu_context, r18)); + /* non-volatile registers */ + DEFINE(CC_R19, offsetof(struct cpu_context, r19)); + DEFINE(CC_R20, offsetof(struct cpu_context, r20)); + DEFINE(CC_R21, offsetof(struct cpu_context, r21)); + DEFINE(CC_R22, offsetof(struct cpu_context, r22)); + DEFINE(CC_R23, offsetof(struct cpu_context, r23)); + DEFINE(CC_R24, offsetof(struct cpu_context, r24)); + DEFINE(CC_R25, offsetof(struct cpu_context, r25)); + DEFINE(CC_R26, offsetof(struct cpu_context, r26)); + DEFINE(CC_R27, offsetof(struct cpu_context, r27)); + DEFINE(CC_R28, offsetof(struct cpu_context, r28)); + DEFINE(CC_R29, offsetof(struct cpu_context, r29)); + DEFINE(CC_R30, offsetof(struct cpu_context, r30)); + /* special purpose registers */ + DEFINE(CC_MSR, offsetof(struct cpu_context, msr)); + DEFINE(CC_EAR, offsetof(struct cpu_context, ear)); + DEFINE(CC_ESR, offsetof(struct cpu_context, esr)); + DEFINE(CC_FSR, offsetof(struct cpu_context, fsr)); + BLANK(); + + return 0; +} diff --git a/arch/microblaze/kernel/cpu/Makefile b/arch/microblaze/kernel/cpu/Makefile new file mode 100644 index 000000000..059afc75a --- /dev/null +++ b/arch/microblaze/kernel/cpu/Makefile @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Build the appropriate CPU version support +# + +ifdef CONFIG_FUNCTION_TRACER +CFLAGS_REMOVE_cache.o = -pg +endif + +ccflags-y := -DCPU_MAJOR=$(CPU_MAJOR) -DCPU_MINOR=$(CPU_MINOR) \ + -DCPU_REV=$(CPU_REV) + +obj-y += cache.o cpuinfo.o cpuinfo-pvr-full.o cpuinfo-static.o mb.o pvr.o diff --git a/arch/microblaze/kernel/cpu/cache.c b/arch/microblaze/kernel/cpu/cache.c new file mode 100644 index 000000000..dcba53803 --- /dev/null +++ b/arch/microblaze/kernel/cpu/cache.c @@ -0,0 +1,656 @@ +/* + * Cache control for MicroBlaze cache memories + * + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <asm/cacheflush.h> +#include <linux/cache.h> +#include <asm/cpuinfo.h> +#include <asm/pvr.h> + +static inline void __enable_icache_msr(void) +{ + __asm__ __volatile__ (" msrset r0, %0;" \ + "nop;" \ + : : "i" (MSR_ICE) : "memory"); +} + +static inline void __disable_icache_msr(void) +{ + __asm__ __volatile__ (" msrclr r0, %0;" \ + "nop;" \ + : : "i" (MSR_ICE) : "memory"); +} + +static inline void __enable_dcache_msr(void) +{ + __asm__ __volatile__ (" msrset r0, %0;" \ + "nop;" \ + : : "i" (MSR_DCE) : "memory"); +} + +static inline void __disable_dcache_msr(void) +{ + __asm__ __volatile__ (" msrclr r0, %0;" \ + "nop; " \ + : : "i" (MSR_DCE) : "memory"); +} + +static inline void __enable_icache_nomsr(void) +{ + __asm__ __volatile__ (" mfs r12, rmsr;" \ + "nop;" \ + "ori r12, r12, %0;" \ + "mts rmsr, r12;" \ + "nop;" \ + : : "i" (MSR_ICE) : "memory", "r12"); +} + +static inline void __disable_icache_nomsr(void) +{ + __asm__ __volatile__ (" mfs r12, rmsr;" \ + "nop;" \ + "andi r12, r12, ~%0;" \ + "mts rmsr, r12;" \ + "nop;" \ + : : "i" (MSR_ICE) : "memory", "r12"); +} + +static inline void __enable_dcache_nomsr(void) +{ + __asm__ __volatile__ (" mfs r12, rmsr;" \ + "nop;" \ + "ori r12, r12, %0;" \ + "mts rmsr, r12;" \ + "nop;" \ + : : "i" (MSR_DCE) : "memory", "r12"); +} + +static inline void __disable_dcache_nomsr(void) +{ + __asm__ __volatile__ (" mfs r12, rmsr;" \ + "nop;" \ + "andi r12, r12, ~%0;" \ + "mts rmsr, r12;" \ + "nop;" \ + : : "i" (MSR_DCE) : "memory", "r12"); +} + + +/* Helper macro for computing the limits of cache range loops + * + * End address can be unaligned which is OK for C implementation. + * ASM implementation align it in ASM macros + */ +#define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size) \ +do { \ + int align = ~(cache_line_length - 1); \ + if (start < UINT_MAX - cache_size) \ + end = min(start + cache_size, end); \ + start &= align; \ +} while (0) + +/* + * Helper macro to loop over the specified cache_size/line_length and + * execute 'op' on that cacheline + */ +#define CACHE_ALL_LOOP(cache_size, line_length, op) \ +do { \ + unsigned int len = cache_size - line_length; \ + int step = -line_length; \ + WARN_ON(step >= 0); \ + \ + __asm__ __volatile__ (" 1: " #op " %0, r0;" \ + "bgtid %0, 1b;" \ + "addk %0, %0, %1;" \ + : : "r" (len), "r" (step) \ + : "memory"); \ +} while (0) + +/* Used for wdc.flush/clear which can use rB for offset which is not possible + * to use for simple wdc or wic. + * + * start address is cache aligned + * end address is not aligned, if end is aligned then I have to subtract + * cacheline length because I can't flush/invalidate the next cacheline. + * If is not, I align it because I will flush/invalidate whole line. + */ +#define CACHE_RANGE_LOOP_2(start, end, line_length, op) \ +do { \ + int step = -line_length; \ + int align = ~(line_length - 1); \ + int count; \ + end = ((end & align) == end) ? end - line_length : end & align; \ + count = end - start; \ + WARN_ON(count < 0); \ + \ + __asm__ __volatile__ (" 1: " #op " %0, %1;" \ + "bgtid %1, 1b;" \ + "addk %1, %1, %2;" \ + : : "r" (start), "r" (count), \ + "r" (step) : "memory"); \ +} while (0) + +/* It is used only first parameter for OP - for wic, wdc */ +#define CACHE_RANGE_LOOP_1(start, end, line_length, op) \ +do { \ + unsigned int volatile temp = 0; \ + unsigned int align = ~(line_length - 1); \ + end = ((end & align) == end) ? end - line_length : end & align; \ + WARN_ON(end < start); \ + \ + __asm__ __volatile__ (" 1: " #op " %1, r0;" \ + "cmpu %0, %1, %2;" \ + "bgtid %0, 1b;" \ + "addk %1, %1, %3;" \ + : : "r" (temp), "r" (start), "r" (end), \ + "r" (line_length) : "memory"); \ +} while (0) + +#define ASM_LOOP + +static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.icache_line_length, cpuinfo.icache_size); + + local_irq_save(flags); + __disable_icache_msr(); + +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic); +#else + for (i = start; i < end; i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif + __enable_icache_msr(); + local_irq_restore(flags); +} + +static void __flush_icache_range_nomsr_irq(unsigned long start, + unsigned long end) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.icache_line_length, cpuinfo.icache_size); + + local_irq_save(flags); + __disable_icache_nomsr(); + +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic); +#else + for (i = start; i < end; i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif + + __enable_icache_nomsr(); + local_irq_restore(flags); +} + +static void __flush_icache_range_noirq(unsigned long start, + unsigned long end) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.icache_line_length, cpuinfo.icache_size); +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic); +#else + for (i = start; i < end; i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __flush_icache_all_msr_irq(void) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); + + local_irq_save(flags); + __disable_icache_msr(); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic); +#else + for (i = 0; i < cpuinfo.icache_size; + i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif + __enable_icache_msr(); + local_irq_restore(flags); +} + +static void __flush_icache_all_nomsr_irq(void) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); + + local_irq_save(flags); + __disable_icache_nomsr(); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic); +#else + for (i = 0; i < cpuinfo.icache_size; + i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif + __enable_icache_nomsr(); + local_irq_restore(flags); +} + +static void __flush_icache_all_noirq(void) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic); +#else + for (i = 0; i < cpuinfo.icache_size; + i += cpuinfo.icache_line_length) + __asm__ __volatile__ ("wic %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __invalidate_dcache_all_msr_irq(void) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); + + local_irq_save(flags); + __disable_dcache_msr(); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc); +#else + for (i = 0; i < cpuinfo.dcache_size; + i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif + __enable_dcache_msr(); + local_irq_restore(flags); +} + +static void __invalidate_dcache_all_nomsr_irq(void) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); + + local_irq_save(flags); + __disable_dcache_nomsr(); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc); +#else + for (i = 0; i < cpuinfo.dcache_size; + i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif + __enable_dcache_nomsr(); + local_irq_restore(flags); +} + +static void __invalidate_dcache_all_noirq_wt(void) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc); +#else + for (i = 0; i < cpuinfo.dcache_size; + i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif +} + +/* + * FIXME It is blindly invalidation as is expected + * but can't be called on noMMU in microblaze_cache_init below + * + * MS: noMMU kernel won't boot if simple wdc is used + * The reason should be that there are discared data which kernel needs + */ +static void __invalidate_dcache_all_wb(void) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, + wdc); +#else + for (i = 0; i < cpuinfo.dcache_size; + i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __invalidate_dcache_range_wb(unsigned long start, + unsigned long end) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.dcache_line_length, cpuinfo.dcache_size); +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear); +#else + for (i = start; i < end; i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc.clear %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __invalidate_dcache_range_nomsr_wt(unsigned long start, + unsigned long end) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + CACHE_LOOP_LIMITS(start, end, + cpuinfo.dcache_line_length, cpuinfo.dcache_size); + +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc); +#else + for (i = start; i < end; i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __invalidate_dcache_range_msr_irq_wt(unsigned long start, + unsigned long end) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + CACHE_LOOP_LIMITS(start, end, + cpuinfo.dcache_line_length, cpuinfo.dcache_size); + + local_irq_save(flags); + __disable_dcache_msr(); + +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc); +#else + for (i = start; i < end; i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif + + __enable_dcache_msr(); + local_irq_restore(flags); +} + +static void __invalidate_dcache_range_nomsr_irq(unsigned long start, + unsigned long end) +{ + unsigned long flags; +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.dcache_line_length, cpuinfo.dcache_size); + + local_irq_save(flags); + __disable_dcache_nomsr(); + +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc); +#else + for (i = start; i < end; i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc %0, r0;" \ + : : "r" (i)); +#endif + + __enable_dcache_nomsr(); + local_irq_restore(flags); +} + +static void __flush_dcache_all_wb(void) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s\n", __func__); +#ifdef ASM_LOOP + CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, + wdc.flush); +#else + for (i = 0; i < cpuinfo.dcache_size; + i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc.flush %0, r0;" \ + : : "r" (i)); +#endif +} + +static void __flush_dcache_range_wb(unsigned long start, unsigned long end) +{ +#ifndef ASM_LOOP + int i; +#endif + pr_debug("%s: start 0x%x, end 0x%x\n", __func__, + (unsigned int)start, (unsigned int) end); + + CACHE_LOOP_LIMITS(start, end, + cpuinfo.dcache_line_length, cpuinfo.dcache_size); +#ifdef ASM_LOOP + CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush); +#else + for (i = start; i < end; i += cpuinfo.dcache_line_length) + __asm__ __volatile__ ("wdc.flush %0, r0;" \ + : : "r" (i)); +#endif +} + +/* struct for wb caches and for wt caches */ +struct scache *mbc; + +/* new wb cache model */ +static const struct scache wb_msr = { + .ie = __enable_icache_msr, + .id = __disable_icache_msr, + .ifl = __flush_icache_all_noirq, + .iflr = __flush_icache_range_noirq, + .iin = __flush_icache_all_noirq, + .iinr = __flush_icache_range_noirq, + .de = __enable_dcache_msr, + .dd = __disable_dcache_msr, + .dfl = __flush_dcache_all_wb, + .dflr = __flush_dcache_range_wb, + .din = __invalidate_dcache_all_wb, + .dinr = __invalidate_dcache_range_wb, +}; + +/* There is only difference in ie, id, de, dd functions */ +static const struct scache wb_nomsr = { + .ie = __enable_icache_nomsr, + .id = __disable_icache_nomsr, + .ifl = __flush_icache_all_noirq, + .iflr = __flush_icache_range_noirq, + .iin = __flush_icache_all_noirq, + .iinr = __flush_icache_range_noirq, + .de = __enable_dcache_nomsr, + .dd = __disable_dcache_nomsr, + .dfl = __flush_dcache_all_wb, + .dflr = __flush_dcache_range_wb, + .din = __invalidate_dcache_all_wb, + .dinr = __invalidate_dcache_range_wb, +}; + +/* Old wt cache model with disabling irq and turn off cache */ +static const struct scache wt_msr = { + .ie = __enable_icache_msr, + .id = __disable_icache_msr, + .ifl = __flush_icache_all_msr_irq, + .iflr = __flush_icache_range_msr_irq, + .iin = __flush_icache_all_msr_irq, + .iinr = __flush_icache_range_msr_irq, + .de = __enable_dcache_msr, + .dd = __disable_dcache_msr, + .dfl = __invalidate_dcache_all_msr_irq, + .dflr = __invalidate_dcache_range_msr_irq_wt, + .din = __invalidate_dcache_all_msr_irq, + .dinr = __invalidate_dcache_range_msr_irq_wt, +}; + +static const struct scache wt_nomsr = { + .ie = __enable_icache_nomsr, + .id = __disable_icache_nomsr, + .ifl = __flush_icache_all_nomsr_irq, + .iflr = __flush_icache_range_nomsr_irq, + .iin = __flush_icache_all_nomsr_irq, + .iinr = __flush_icache_range_nomsr_irq, + .de = __enable_dcache_nomsr, + .dd = __disable_dcache_nomsr, + .dfl = __invalidate_dcache_all_nomsr_irq, + .dflr = __invalidate_dcache_range_nomsr_irq, + .din = __invalidate_dcache_all_nomsr_irq, + .dinr = __invalidate_dcache_range_nomsr_irq, +}; + +/* New wt cache model for newer Microblaze versions */ +static const struct scache wt_msr_noirq = { + .ie = __enable_icache_msr, + .id = __disable_icache_msr, + .ifl = __flush_icache_all_noirq, + .iflr = __flush_icache_range_noirq, + .iin = __flush_icache_all_noirq, + .iinr = __flush_icache_range_noirq, + .de = __enable_dcache_msr, + .dd = __disable_dcache_msr, + .dfl = __invalidate_dcache_all_noirq_wt, + .dflr = __invalidate_dcache_range_nomsr_wt, + .din = __invalidate_dcache_all_noirq_wt, + .dinr = __invalidate_dcache_range_nomsr_wt, +}; + +static const struct scache wt_nomsr_noirq = { + .ie = __enable_icache_nomsr, + .id = __disable_icache_nomsr, + .ifl = __flush_icache_all_noirq, + .iflr = __flush_icache_range_noirq, + .iin = __flush_icache_all_noirq, + .iinr = __flush_icache_range_noirq, + .de = __enable_dcache_nomsr, + .dd = __disable_dcache_nomsr, + .dfl = __invalidate_dcache_all_noirq_wt, + .dflr = __invalidate_dcache_range_nomsr_wt, + .din = __invalidate_dcache_all_noirq_wt, + .dinr = __invalidate_dcache_range_nomsr_wt, +}; + +/* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */ +#define CPUVER_7_20_A 0x0c +#define CPUVER_7_20_D 0x0f + +void microblaze_cache_init(void) +{ + if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) { + if (cpuinfo.dcache_wb) { + pr_info("wb_msr\n"); + mbc = (struct scache *)&wb_msr; + if (cpuinfo.ver_code <= CPUVER_7_20_D) { + /* MS: problem with signal handling - hw bug */ + pr_info("WB won't work properly\n"); + } + } else { + if (cpuinfo.ver_code >= CPUVER_7_20_A) { + pr_info("wt_msr_noirq\n"); + mbc = (struct scache *)&wt_msr_noirq; + } else { + pr_info("wt_msr\n"); + mbc = (struct scache *)&wt_msr; + } + } + } else { + if (cpuinfo.dcache_wb) { + pr_info("wb_nomsr\n"); + mbc = (struct scache *)&wb_nomsr; + if (cpuinfo.ver_code <= CPUVER_7_20_D) { + /* MS: problem with signal handling - hw bug */ + pr_info("WB won't work properly\n"); + } + } else { + if (cpuinfo.ver_code >= CPUVER_7_20_A) { + pr_info("wt_nomsr_noirq\n"); + mbc = (struct scache *)&wt_nomsr_noirq; + } else { + pr_info("wt_nomsr\n"); + mbc = (struct scache *)&wt_nomsr; + } + } + } + /* + * FIXME Invalidation is done in U-BOOT + * WT cache: Data is already written to main memory + * WB cache: Discard data on noMMU which caused that kernel doesn't boot + */ + /* invalidate_dcache(); */ + enable_dcache(); + + invalidate_icache(); + enable_icache(); +} diff --git a/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c new file mode 100644 index 000000000..a32daec96 --- /dev/null +++ b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c @@ -0,0 +1,115 @@ +/* + * Support for MicroBlaze PVR (processor version register) + * + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007 John Williams <john.williams@petalogix.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/string.h> +#include <asm/pvr.h> +#include <asm/cpuinfo.h> + +/* + * Helper macro to map between fields in our struct cpuinfo, and + * the PVR macros in pvr.h. + */ + +#define CI(c, p) { ci->c = PVR_##p(pvr); } + +#if defined(CONFIG_EARLY_PRINTK) && defined(CONFIG_SERIAL_UARTLITE_CONSOLE) +#define err_printk(x) \ + early_printk("ERROR: Microblaze " x "-different for PVR and DTS\n"); +#else +#define err_printk(x) \ + pr_info("ERROR: Microblaze " x "-different for PVR and DTS\n"); +#endif + +void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu) +{ + struct pvr_s pvr; + u32 temp; /* for saving temp value */ + get_pvr(&pvr); + + CI(ver_code, VERSION); + if (!ci->ver_code) { + pr_err("ERROR: MB has broken PVR regs -> use DTS setting\n"); + return; + } + + temp = PVR_USE_BARREL(pvr) | PVR_USE_MSR_INSTR(pvr) | + PVR_USE_PCMP_INSTR(pvr) | PVR_USE_DIV(pvr); + if (ci->use_instr != temp) + err_printk("BARREL, MSR, PCMP or DIV"); + ci->use_instr = temp; + + temp = PVR_USE_HW_MUL(pvr) | PVR_USE_MUL64(pvr); + if (ci->use_mult != temp) + err_printk("HW_MUL"); + ci->use_mult = temp; + + temp = PVR_USE_FPU(pvr) | PVR_USE_FPU2(pvr); + if (ci->use_fpu != temp) + err_printk("HW_FPU"); + ci->use_fpu = temp; + + ci->use_exc = PVR_OPCODE_0x0_ILLEGAL(pvr) | + PVR_UNALIGNED_EXCEPTION(pvr) | + PVR_ILL_OPCODE_EXCEPTION(pvr) | + PVR_IOPB_BUS_EXCEPTION(pvr) | + PVR_DOPB_BUS_EXCEPTION(pvr) | + PVR_DIV_ZERO_EXCEPTION(pvr) | + PVR_FPU_EXCEPTION(pvr) | + PVR_FSL_EXCEPTION(pvr); + + CI(pvr_user1, USER1); + CI(pvr_user2, USER2); + + CI(mmu, USE_MMU); + CI(mmu_privins, MMU_PRIVINS); + CI(endian, ENDIAN); + + CI(use_icache, USE_ICACHE); + CI(icache_tagbits, ICACHE_ADDR_TAG_BITS); + CI(icache_write, ICACHE_ALLOW_WR); + ci->icache_line_length = PVR_ICACHE_LINE_LEN(pvr) << 2; + CI(icache_size, ICACHE_BYTE_SIZE); + CI(icache_base, ICACHE_BASEADDR); + CI(icache_high, ICACHE_HIGHADDR); + + CI(use_dcache, USE_DCACHE); + CI(dcache_tagbits, DCACHE_ADDR_TAG_BITS); + CI(dcache_write, DCACHE_ALLOW_WR); + ci->dcache_line_length = PVR_DCACHE_LINE_LEN(pvr) << 2; + CI(dcache_size, DCACHE_BYTE_SIZE); + CI(dcache_base, DCACHE_BASEADDR); + CI(dcache_high, DCACHE_HIGHADDR); + + temp = PVR_DCACHE_USE_WRITEBACK(pvr); + if (ci->dcache_wb != temp) + err_printk("DCACHE WB"); + ci->dcache_wb = temp; + + CI(use_dopb, D_OPB); + CI(use_iopb, I_OPB); + CI(use_dlmb, D_LMB); + CI(use_ilmb, I_LMB); + CI(num_fsl, FSL_LINKS); + + CI(irq_edge, INTERRUPT_IS_EDGE); + CI(irq_positive, EDGE_IS_POSITIVE); + + CI(area_optimised, AREA_OPTIMISED); + + CI(hw_debug, DEBUG_ENABLED); + CI(num_pc_brk, NUMBER_OF_PC_BRK); + CI(num_rd_brk, NUMBER_OF_RD_ADDR_BRK); + CI(num_wr_brk, NUMBER_OF_WR_ADDR_BRK); + + CI(fpga_family_code, TARGET_FAMILY); +} diff --git a/arch/microblaze/kernel/cpu/cpuinfo-static.c b/arch/microblaze/kernel/cpu/cpuinfo-static.c new file mode 100644 index 000000000..85dbda4a0 --- /dev/null +++ b/arch/microblaze/kernel/cpu/cpuinfo-static.c @@ -0,0 +1,145 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007 John Williams <john.williams@petalogix.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/string.h> +#include <asm/cpuinfo.h> +#include <asm/pvr.h> + +static const char family_string[] = CONFIG_XILINX_MICROBLAZE0_FAMILY; +static const char cpu_ver_string[] = CONFIG_XILINX_MICROBLAZE0_HW_VER; + +#define err_printk(x) \ + early_printk("ERROR: Microblaze " x "-different for kernel and DTS\n"); + +void __init set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu) +{ + u32 i = 0; + + ci->use_instr = + (fcpu(cpu, "xlnx,use-barrel") ? PVR0_USE_BARREL_MASK : 0) | + (fcpu(cpu, "xlnx,use-msr-instr") ? PVR2_USE_MSR_INSTR : 0) | + (fcpu(cpu, "xlnx,use-pcmp-instr") ? PVR2_USE_PCMP_INSTR : 0) | + (fcpu(cpu, "xlnx,use-div") ? PVR0_USE_DIV_MASK : 0); + if (CONFIG_XILINX_MICROBLAZE0_USE_BARREL) + i |= PVR0_USE_BARREL_MASK; + if (CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR) + i |= PVR2_USE_MSR_INSTR; + if (CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR) + i |= PVR2_USE_PCMP_INSTR; + if (CONFIG_XILINX_MICROBLAZE0_USE_DIV) + i |= PVR0_USE_DIV_MASK; + if (ci->use_instr != i) + err_printk("BARREL, MSR, PCMP or DIV"); + + ci->use_mult = fcpu(cpu, "xlnx,use-hw-mul"); + if (ci->use_mult != CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL) + err_printk("HW_MUL"); + ci->use_mult = + (ci->use_mult > 1 ? + (PVR2_USE_MUL64_MASK | PVR0_USE_HW_MUL_MASK) : + (ci->use_mult == 1 ? PVR0_USE_HW_MUL_MASK : 0)); + + ci->use_fpu = fcpu(cpu, "xlnx,use-fpu"); + if (ci->use_fpu != CONFIG_XILINX_MICROBLAZE0_USE_FPU) + err_printk("HW_FPU"); + ci->use_fpu = (ci->use_fpu > 1 ? + (PVR2_USE_FPU2_MASK | PVR0_USE_FPU_MASK) : + (ci->use_fpu == 1 ? PVR0_USE_FPU_MASK : 0)); + + ci->use_exc = + (fcpu(cpu, "xlnx,unaligned-exceptions") ? + PVR2_UNALIGNED_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,ill-opcode-exception") ? + PVR2_ILL_OPCODE_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,iopb-bus-exception") ? + PVR2_IOPB_BUS_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,dopb-bus-exception") ? + PVR2_DOPB_BUS_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,div-zero-exception") ? + PVR2_DIV_ZERO_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,fpu-exception") ? PVR2_FPU_EXC_MASK : 0) | + (fcpu(cpu, "xlnx,fsl-exception") ? PVR2_USE_EXTEND_FSL : 0); + + ci->use_icache = fcpu(cpu, "xlnx,use-icache"); + ci->icache_tagbits = fcpu(cpu, "xlnx,addr-tag-bits"); + ci->icache_write = fcpu(cpu, "xlnx,allow-icache-wr"); + ci->icache_line_length = fcpu(cpu, "xlnx,icache-line-len") << 2; + if (!ci->icache_line_length) { + if (fcpu(cpu, "xlnx,icache-use-fsl")) + ci->icache_line_length = 4 << 2; + else + ci->icache_line_length = 1 << 2; + } + ci->icache_size = fcpu(cpu, "i-cache-size"); + ci->icache_base = fcpu(cpu, "i-cache-baseaddr"); + ci->icache_high = fcpu(cpu, "i-cache-highaddr"); + + ci->use_dcache = fcpu(cpu, "xlnx,use-dcache"); + ci->dcache_tagbits = fcpu(cpu, "xlnx,dcache-addr-tag"); + ci->dcache_write = fcpu(cpu, "xlnx,allow-dcache-wr"); + ci->dcache_line_length = fcpu(cpu, "xlnx,dcache-line-len") << 2; + if (!ci->dcache_line_length) { + if (fcpu(cpu, "xlnx,dcache-use-fsl")) + ci->dcache_line_length = 4 << 2; + else + ci->dcache_line_length = 1 << 2; + } + ci->dcache_size = fcpu(cpu, "d-cache-size"); + ci->dcache_base = fcpu(cpu, "d-cache-baseaddr"); + ci->dcache_high = fcpu(cpu, "d-cache-highaddr"); + ci->dcache_wb = fcpu(cpu, "xlnx,dcache-use-writeback"); + + ci->use_dopb = fcpu(cpu, "xlnx,d-opb"); + ci->use_iopb = fcpu(cpu, "xlnx,i-opb"); + ci->use_dlmb = fcpu(cpu, "xlnx,d-lmb"); + ci->use_ilmb = fcpu(cpu, "xlnx,i-lmb"); + + ci->num_fsl = fcpu(cpu, "xlnx,fsl-links"); + ci->irq_edge = fcpu(cpu, "xlnx,interrupt-is-edge"); + ci->irq_positive = fcpu(cpu, "xlnx,edge-is-positive"); + ci->area_optimised = 0; + + ci->hw_debug = fcpu(cpu, "xlnx,debug-enabled"); + ci->num_pc_brk = fcpu(cpu, "xlnx,number-of-pc-brk"); + ci->num_rd_brk = fcpu(cpu, "xlnx,number-of-rd-addr-brk"); + ci->num_wr_brk = fcpu(cpu, "xlnx,number-of-wr-addr-brk"); + + ci->pvr_user1 = fcpu(cpu, "xlnx,pvr-user1"); + ci->pvr_user2 = fcpu(cpu, "xlnx,pvr-user2"); + + ci->mmu = fcpu(cpu, "xlnx,use-mmu"); + ci->mmu_privins = fcpu(cpu, "xlnx,mmu-privileged-instr"); + ci->endian = fcpu(cpu, "xlnx,endianness"); + + ci->ver_code = 0; + ci->fpga_family_code = 0; + + /* Do various fixups based on CPU version and FPGA family strings */ + + /* Resolved the CPU version code */ + for (i = 0; cpu_ver_lookup[i].s != NULL; i++) { + if (strcmp(cpu_ver_lookup[i].s, cpu_ver_string) == 0) + ci->ver_code = cpu_ver_lookup[i].k; + } + + /* Resolved the fpga family code */ + for (i = 0; family_string_lookup[i].s != NULL; i++) { + if (strcmp(family_string_lookup[i].s, family_string) == 0) + ci->fpga_family_code = family_string_lookup[i].k; + } + + /* FIXME - mb3 and spartan2 do not exist in PVR */ + /* This is mb3 and on a non Spartan2 */ + if (ci->ver_code == 0x20 && ci->fpga_family_code != 0xf0) + /* Hardware Multiplier in use */ + ci->use_mult = 1; +} diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c new file mode 100644 index 000000000..96b3f26d1 --- /dev/null +++ b/arch/microblaze/kernel/cpu/cpuinfo.c @@ -0,0 +1,139 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007 John Williams <john.williams@petalogix.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/clk.h> +#include <linux/init.h> +#include <asm/cpuinfo.h> +#include <asm/pvr.h> + +const struct cpu_ver_key cpu_ver_lookup[] = { + /* These key value are as per MBV field in PVR0 */ + {"5.00.a", 0x01}, + {"5.00.b", 0x02}, + {"5.00.c", 0x03}, + {"6.00.a", 0x04}, + {"6.00.b", 0x06}, + {"7.00.a", 0x05}, + {"7.00.b", 0x07}, + {"7.10.a", 0x08}, + {"7.10.b", 0x09}, + {"7.10.c", 0x0a}, + {"7.10.d", 0x0b}, + {"7.20.a", 0x0c}, + {"7.20.b", 0x0d}, + {"7.20.c", 0x0e}, + {"7.20.d", 0x0f}, + {"7.30.a", 0x10}, + {"7.30.b", 0x11}, + {"8.00.a", 0x12}, + {"8.00.b", 0x13}, + {"8.10.a", 0x14}, + {"8.20.a", 0x15}, + {"8.20.b", 0x16}, + {"8.30.a", 0x17}, + {"8.40.a", 0x18}, + {"8.40.b", 0x19}, + {"8.50.a", 0x1a}, + {"8.50.b", 0x1c}, + {"8.50.c", 0x1e}, + {"9.0", 0x1b}, + {"9.1", 0x1d}, + {"9.2", 0x1f}, + {"9.3", 0x20}, + {"9.4", 0x21}, + {"9.5", 0x22}, + {"9.6", 0x23}, + {"10.0", 0x24}, + {NULL, 0}, +}; + +/* + * FIXME Not sure if the actual key is defined by Xilinx in the PVR + */ +const struct family_string_key family_string_lookup[] = { + {"virtex2", 0x4}, + {"virtex2pro", 0x5}, + {"spartan3", 0x6}, + {"virtex4", 0x7}, + {"virtex5", 0x8}, + {"spartan3e", 0x9}, + {"spartan3a", 0xa}, + {"spartan3an", 0xb}, + {"spartan3adsp", 0xc}, + {"spartan6", 0xd}, + {"virtex6", 0xe}, + {"virtex7", 0xf}, + /* FIXME There is no key code defined for spartan2 */ + {"spartan2", 0xf0}, + {"kintex7", 0x10}, + {"artix7", 0x11}, + {"zynq7000", 0x12}, + {"UltraScale Virtex", 0x13}, + {"UltraScale Kintex", 0x14}, + {"UltraScale+ Zynq", 0x15}, + {"UltraScale+ Virtex", 0x16}, + {"UltraScale+ Kintex", 0x17}, + {"Spartan7", 0x18}, + {NULL, 0}, +}; + +struct cpuinfo cpuinfo; +static struct device_node *cpu; + +void __init setup_cpuinfo(void) +{ + cpu = (struct device_node *) of_find_node_by_type(NULL, "cpu"); + if (!cpu) + pr_err("You don't have cpu!!!\n"); + + pr_info("%s: initialising\n", __func__); + + switch (cpu_has_pvr()) { + case 0: + pr_warn("%s: No PVR support. Using static CPU info from FDT\n", + __func__); + set_cpuinfo_static(&cpuinfo, cpu); + break; +/* FIXME I found weird behavior with MB 7.00.a/b 7.10.a + * please do not use FULL PVR with MMU */ + case 1: + pr_info("%s: Using full CPU PVR support\n", + __func__); + set_cpuinfo_static(&cpuinfo, cpu); + set_cpuinfo_pvr_full(&cpuinfo, cpu); + break; + default: + pr_warn("%s: Unsupported PVR setting\n", __func__); + set_cpuinfo_static(&cpuinfo, cpu); + } + + if (cpuinfo.mmu_privins) + pr_warn("%s: Stream instructions enabled" + " - USERSPACE CAN LOCK THIS KERNEL!\n", __func__); +} + +void __init setup_cpuinfo_clk(void) +{ + struct clk *clk; + + clk = of_clk_get(cpu, 0); + if (IS_ERR(clk)) { + pr_err("ERROR: CPU CCF input clock not found\n"); + /* take timebase-frequency from DTS */ + cpuinfo.cpu_clock_freq = fcpu(cpu, "timebase-frequency"); + } else { + cpuinfo.cpu_clock_freq = clk_get_rate(clk); + } + + if (!cpuinfo.cpu_clock_freq) { + pr_err("ERROR: CPU clock frequency not setup\n"); + BUG(); + } +} diff --git a/arch/microblaze/kernel/cpu/mb.c b/arch/microblaze/kernel/cpu/mb.c new file mode 100644 index 000000000..9581d194d --- /dev/null +++ b/arch/microblaze/kernel/cpu/mb.c @@ -0,0 +1,158 @@ +/* + * CPU-version specific code + * + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2006-2009 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/string.h> +#include <linux/seq_file.h> +#include <linux/cpu.h> +#include <linux/initrd.h> + +#include <linux/bug.h> +#include <asm/cpuinfo.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <asm/page.h> +#include <linux/param.h> +#include <asm/pvr.h> +#include <asm/sections.h> +#include <asm/setup.h> + +static int show_cpuinfo(struct seq_file *m, void *v) +{ + char *fpga_family = "Unknown"; + char *cpu_ver = "Unknown"; + int i; + + /* Denormalised to get the fpga family string */ + for (i = 0; family_string_lookup[i].s != NULL; i++) { + if (cpuinfo.fpga_family_code == family_string_lookup[i].k) { + fpga_family = (char *)family_string_lookup[i].s; + break; + } + } + + /* Denormalised to get the hw version string */ + for (i = 0; cpu_ver_lookup[i].s != NULL; i++) { + if (cpuinfo.ver_code == cpu_ver_lookup[i].k) { + cpu_ver = (char *)cpu_ver_lookup[i].s; + break; + } + } + + seq_printf(m, + "CPU-Family: MicroBlaze\n" + "FPGA-Arch: %s\n" + "CPU-Ver: %s, %s endian\n" + "CPU-MHz: %d.%02d\n" + "BogoMips: %lu.%02lu\n", + fpga_family, + cpu_ver, + cpuinfo.endian ? "little" : "big", + cpuinfo.cpu_clock_freq / 1000000, + cpuinfo.cpu_clock_freq % 1000000, + loops_per_jiffy / (500000 / HZ), + (loops_per_jiffy / (5000 / HZ)) % 100); + + seq_printf(m, + "HW:\n Shift:\t\t%s\n" + " MSR:\t\t%s\n" + " PCMP:\t\t%s\n" + " DIV:\t\t%s\n", + (cpuinfo.use_instr & PVR0_USE_BARREL_MASK) ? "yes" : "no", + (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) ? "yes" : "no", + (cpuinfo.use_instr & PVR2_USE_PCMP_INSTR) ? "yes" : "no", + (cpuinfo.use_instr & PVR0_USE_DIV_MASK) ? "yes" : "no"); + + seq_printf(m, " MMU:\t\t%x\n", cpuinfo.mmu); + + seq_printf(m, + " MUL:\t\t%s\n" + " FPU:\t\t%s\n", + (cpuinfo.use_mult & PVR2_USE_MUL64_MASK) ? "v2" : + (cpuinfo.use_mult & PVR0_USE_HW_MUL_MASK) ? "v1" : "no", + (cpuinfo.use_fpu & PVR2_USE_FPU2_MASK) ? "v2" : + (cpuinfo.use_fpu & PVR0_USE_FPU_MASK) ? "v1" : "no"); + + seq_printf(m, + " Exc:\t\t%s%s%s%s%s%s%s%s\n", + (cpuinfo.use_exc & PVR2_OPCODE_0x0_ILL_MASK) ? "op0x0 " : "", + (cpuinfo.use_exc & PVR2_UNALIGNED_EXC_MASK) ? "unal " : "", + (cpuinfo.use_exc & PVR2_ILL_OPCODE_EXC_MASK) ? "ill " : "", + (cpuinfo.use_exc & PVR2_IOPB_BUS_EXC_MASK) ? "iopb " : "", + (cpuinfo.use_exc & PVR2_DOPB_BUS_EXC_MASK) ? "dopb " : "", + (cpuinfo.use_exc & PVR2_DIV_ZERO_EXC_MASK) ? "zero " : "", + (cpuinfo.use_exc & PVR2_FPU_EXC_MASK) ? "fpu " : "", + (cpuinfo.use_exc & PVR2_USE_FSL_EXC) ? "fsl " : ""); + + seq_printf(m, + "Stream-insns:\t%sprivileged\n", + cpuinfo.mmu_privins ? "un" : ""); + + if (cpuinfo.use_icache) + seq_printf(m, + "Icache:\t\t%ukB\tline length:\t%dB\n", + cpuinfo.icache_size >> 10, + cpuinfo.icache_line_length); + else + seq_puts(m, "Icache:\t\tno\n"); + + if (cpuinfo.use_dcache) { + seq_printf(m, + "Dcache:\t\t%ukB\tline length:\t%dB\n", + cpuinfo.dcache_size >> 10, + cpuinfo.dcache_line_length); + seq_puts(m, "Dcache-Policy:\t"); + if (cpuinfo.dcache_wb) + seq_puts(m, "write-back\n"); + else + seq_puts(m, "write-through\n"); + } else { + seq_puts(m, "Dcache:\t\tno\n"); + } + + seq_printf(m, + "HW-Debug:\t%s\n", + cpuinfo.hw_debug ? "yes" : "no"); + + seq_printf(m, + "PVR-USR1:\t%02x\n" + "PVR-USR2:\t%08x\n", + cpuinfo.pvr_user1, + cpuinfo.pvr_user2); + + seq_printf(m, "Page size:\t%lu\n", PAGE_SIZE); + + return 0; +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + int i = *pos; + + return i < NR_CPUS ? (void *) (i + 1) : NULL; +} + +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return c_start(m, pos); +} + +static void c_stop(struct seq_file *m, void *v) +{ +} + +const struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; diff --git a/arch/microblaze/kernel/cpu/pvr.c b/arch/microblaze/kernel/cpu/pvr.c new file mode 100644 index 000000000..8d0dc6db4 --- /dev/null +++ b/arch/microblaze/kernel/cpu/pvr.c @@ -0,0 +1,80 @@ +/* + * Support for MicroBlaze PVR (processor version register) + * + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007 John Williams <john.williams@petalogix.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kernel.h> +#include <linux/compiler.h> +#include <asm/exceptions.h> +#include <asm/pvr.h> + +/* + * Until we get an assembler that knows about the pvr registers, + * this horrible cruft will have to do. + * That hardcoded opcode is mfs r3, rpvrNN + */ + +#define get_single_pvr(pvrid, val) \ +{ \ + register unsigned tmp __asm__("r3"); \ + tmp = 0x0; /* Prevent warning about unused */ \ + __asm__ __volatile__ ( \ + "mfs %0, rpvr" #pvrid ";" \ + : "=r" (tmp) : : "memory"); \ + val = tmp; \ +} + +/* + * Does the CPU support the PVR register? + * return value: + * 0: no PVR + * 1: simple PVR + * 2: full PVR + * + * This must work on all CPU versions, including those before the + * PVR was even an option. + */ + +int cpu_has_pvr(void) +{ + unsigned long flags; + unsigned pvr0; + + local_save_flags(flags); + + /* PVR bit in MSR tells us if there is any support */ + if (!(flags & PVR_MSR_BIT)) + return 0; + + get_single_pvr(0, pvr0); + pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0); + + if (pvr0 & PVR0_PVR_FULL_MASK) + return 1; + + /* for partial PVR use static cpuinfo */ + return 2; +} + +void get_pvr(struct pvr_s *p) +{ + get_single_pvr(0, p->pvr[0]); + get_single_pvr(1, p->pvr[1]); + get_single_pvr(2, p->pvr[2]); + get_single_pvr(3, p->pvr[3]); + get_single_pvr(4, p->pvr[4]); + get_single_pvr(5, p->pvr[5]); + get_single_pvr(6, p->pvr[6]); + get_single_pvr(7, p->pvr[7]); + get_single_pvr(8, p->pvr[8]); + get_single_pvr(9, p->pvr[9]); + get_single_pvr(10, p->pvr[10]); + get_single_pvr(11, p->pvr[11]); +} diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c new file mode 100644 index 000000000..71032cf64 --- /dev/null +++ b/arch/microblaze/kernel/dma.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2009-2010 PetaLogix + * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation + * + * Provide default implementations of the DMA mapping callbacks for + * directly mapped busses. + */ + +#include <linux/device.h> +#include <linux/dma-noncoherent.h> +#include <linux/gfp.h> +#include <linux/dma-debug.h> +#include <linux/export.h> +#include <linux/bug.h> +#include <asm/cacheflush.h> + +static void __dma_sync(struct device *dev, phys_addr_t paddr, size_t size, + enum dma_data_direction direction) +{ + switch (direction) { + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + flush_dcache_range(paddr, paddr + size); + break; + case DMA_FROM_DEVICE: + invalidate_dcache_range(paddr, paddr + size); + break; + default: + BUG(); + } +} + +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) +{ + __dma_sync(dev, paddr, size, dir); +} + +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) +{ + __dma_sync(dev, paddr, size, dir); +} + +int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t handle, size_t size, + unsigned long attrs) +{ +#ifdef CONFIG_MMU + unsigned long user_count = vma_pages(vma); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long off = vma->vm_pgoff; + unsigned long pfn; + + if (off >= count || user_count > (count - off)) + return -ENXIO; + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + pfn = consistent_virt_to_pfn(cpu_addr); + return remap_pfn_range(vma, vma->vm_start, pfn + off, + vma->vm_end - vma->vm_start, vma->vm_page_prot); +#else + return -ENXIO; +#endif +} diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S new file mode 100644 index 000000000..7e394fc2c --- /dev/null +++ b/arch/microblaze/kernel/entry-nommu.S @@ -0,0 +1,622 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/linkage.h> +#include <asm/thread_info.h> +#include <linux/errno.h> +#include <asm/entry.h> +#include <asm/asm-offsets.h> +#include <asm/registers.h> +#include <asm/unistd.h> +#include <asm/percpu.h> +#include <asm/signal.h> + +#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR + .macro disable_irq + msrclr r0, MSR_IE + .endm + + .macro enable_irq + msrset r0, MSR_IE + .endm + + .macro clear_bip + msrclr r0, MSR_BIP + .endm +#else + .macro disable_irq + mfs r11, rmsr + andi r11, r11, ~MSR_IE + mts rmsr, r11 + .endm + + .macro enable_irq + mfs r11, rmsr + ori r11, r11, MSR_IE + mts rmsr, r11 + .endm + + .macro clear_bip + mfs r11, rmsr + andi r11, r11, ~MSR_BIP + mts rmsr, r11 + .endm +#endif + +ENTRY(_interrupt) + swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ + swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ + lwi r11, r0, PER_CPU(KM) /* load mode indicator */ + beqid r11, 1f + nop + brid 2f /* jump over */ + addik r1, r1, (-PT_SIZE) /* room for pt_regs (delay slot) */ +1: /* switch to kernel stack */ + lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ + lwi r1, r1, TS_THREAD_INFO /* get the thread info */ + /* calculate kernel stack pointer */ + addik r1, r1, THREAD_SIZE - PT_SIZE +2: + swi r11, r1, PT_MODE /* store the mode */ + lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ + swi r2, r1, PT_R2 + swi r3, r1, PT_R3 + swi r4, r1, PT_R4 + swi r5, r1, PT_R5 + swi r6, r1, PT_R6 + swi r7, r1, PT_R7 + swi r8, r1, PT_R8 + swi r9, r1, PT_R9 + swi r10, r1, PT_R10 + swi r11, r1, PT_R11 + swi r12, r1, PT_R12 + swi r13, r1, PT_R13 + swi r14, r1, PT_R14 + swi r14, r1, PT_PC + swi r15, r1, PT_R15 + swi r16, r1, PT_R16 + swi r17, r1, PT_R17 + swi r18, r1, PT_R18 + swi r19, r1, PT_R19 + swi r20, r1, PT_R20 + swi r21, r1, PT_R21 + swi r22, r1, PT_R22 + swi r23, r1, PT_R23 + swi r24, r1, PT_R24 + swi r25, r1, PT_R25 + swi r26, r1, PT_R26 + swi r27, r1, PT_R27 + swi r28, r1, PT_R28 + swi r29, r1, PT_R29 + swi r30, r1, PT_R30 + swi r31, r1, PT_R31 + /* special purpose registers */ + mfs r11, rmsr + swi r11, r1, PT_MSR + mfs r11, rear + swi r11, r1, PT_EAR + mfs r11, resr + swi r11, r1, PT_ESR + mfs r11, rfsr + swi r11, r1, PT_FSR + /* reload original stack pointer and save it */ + lwi r11, r0, PER_CPU(ENTRY_SP) + swi r11, r1, PT_R1 + /* update mode indicator we are in kernel mode */ + addik r11, r0, 1 + swi r11, r0, PER_CPU(KM) + /* restore r31 */ + lwi r31, r0, PER_CPU(CURRENT_SAVE) + /* prepare the link register, the argument and jump */ + addik r15, r0, ret_from_intr - 8 + addk r6, r0, r15 + braid do_IRQ + add r5, r0, r1 + +ret_from_intr: + lwi r11, r1, PT_MODE + bneid r11, no_intr_resched + +3: + lwi r6, r31, TS_THREAD_INFO /* get thread info */ + lwi r19, r6, TI_FLAGS /* get flags in thread info */ + /* do an extra work if any bits are set */ + + andi r11, r19, _TIF_NEED_RESCHED + beqi r11, 1f + bralid r15, schedule + nop + bri 3b +1: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME + beqid r11, no_intr_resched + addk r5, r1, r0 + bralid r15, do_notify_resume + addk r6, r0, r0 + bri 3b + +no_intr_resched: + /* Disable interrupts, we are now committed to the state restore */ + disable_irq + + /* save mode indicator */ + lwi r11, r1, PT_MODE + swi r11, r0, PER_CPU(KM) + + /* save r31 */ + swi r31, r0, PER_CPU(CURRENT_SAVE) +restore_context: + /* special purpose registers */ + lwi r11, r1, PT_FSR + mts rfsr, r11 + lwi r11, r1, PT_ESR + mts resr, r11 + lwi r11, r1, PT_EAR + mts rear, r11 + lwi r11, r1, PT_MSR + mts rmsr, r11 + + lwi r31, r1, PT_R31 + lwi r30, r1, PT_R30 + lwi r29, r1, PT_R29 + lwi r28, r1, PT_R28 + lwi r27, r1, PT_R27 + lwi r26, r1, PT_R26 + lwi r25, r1, PT_R25 + lwi r24, r1, PT_R24 + lwi r23, r1, PT_R23 + lwi r22, r1, PT_R22 + lwi r21, r1, PT_R21 + lwi r20, r1, PT_R20 + lwi r19, r1, PT_R19 + lwi r18, r1, PT_R18 + lwi r17, r1, PT_R17 + lwi r16, r1, PT_R16 + lwi r15, r1, PT_R15 + lwi r14, r1, PT_PC + lwi r13, r1, PT_R13 + lwi r12, r1, PT_R12 + lwi r11, r1, PT_R11 + lwi r10, r1, PT_R10 + lwi r9, r1, PT_R9 + lwi r8, r1, PT_R8 + lwi r7, r1, PT_R7 + lwi r6, r1, PT_R6 + lwi r5, r1, PT_R5 + lwi r4, r1, PT_R4 + lwi r3, r1, PT_R3 + lwi r2, r1, PT_R2 + lwi r1, r1, PT_R1 + rtid r14, 0 + nop + +ENTRY(_reset) + brai 0; + +ENTRY(_user_exception) + swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ + swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ + lwi r11, r0, PER_CPU(KM) /* load mode indicator */ + beqid r11, 1f /* Already in kernel mode? */ + nop + brid 2f /* jump over */ + addik r1, r1, (-PT_SIZE) /* Room for pt_regs (delay slot) */ +1: /* Switch to kernel stack */ + lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ + lwi r1, r1, TS_THREAD_INFO /* get the thread info */ + /* calculate kernel stack pointer */ + addik r1, r1, THREAD_SIZE - PT_SIZE +2: + swi r11, r1, PT_MODE /* store the mode */ + lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ + /* save them on stack */ + swi r2, r1, PT_R2 + swi r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */ + swi r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */ + swi r5, r1, PT_R5 + swi r6, r1, PT_R6 + swi r7, r1, PT_R7 + swi r8, r1, PT_R8 + swi r9, r1, PT_R9 + swi r10, r1, PT_R10 + swi r11, r1, PT_R11 + /* r12: _always_ in clobber list; see unistd.h */ + swi r12, r1, PT_R12 + swi r13, r1, PT_R13 + /* r14: _always_ in clobber list; see unistd.h */ + swi r14, r1, PT_R14 + /* but we want to return to the next inst. */ + addik r14, r14, 0x4 + swi r14, r1, PT_PC /* increment by 4 and store in pc */ + swi r15, r1, PT_R15 + swi r16, r1, PT_R16 + swi r17, r1, PT_R17 + swi r18, r1, PT_R18 + swi r19, r1, PT_R19 + swi r20, r1, PT_R20 + swi r21, r1, PT_R21 + swi r22, r1, PT_R22 + swi r23, r1, PT_R23 + swi r24, r1, PT_R24 + swi r25, r1, PT_R25 + swi r26, r1, PT_R26 + swi r27, r1, PT_R27 + swi r28, r1, PT_R28 + swi r29, r1, PT_R29 + swi r30, r1, PT_R30 + swi r31, r1, PT_R31 + + disable_irq + nop /* make sure IE bit is in effect */ + clear_bip /* once IE is in effect it is safe to clear BIP */ + nop + + /* special purpose registers */ + mfs r11, rmsr + swi r11, r1, PT_MSR + mfs r11, rear + swi r11, r1, PT_EAR + mfs r11, resr + swi r11, r1, PT_ESR + mfs r11, rfsr + swi r11, r1, PT_FSR + /* reload original stack pointer and save it */ + lwi r11, r0, PER_CPU(ENTRY_SP) + swi r11, r1, PT_R1 + /* update mode indicator we are in kernel mode */ + addik r11, r0, 1 + swi r11, r0, PER_CPU(KM) + /* restore r31 */ + lwi r31, r0, PER_CPU(CURRENT_SAVE) + /* re-enable interrupts now we are in kernel mode */ + enable_irq + + /* See if the system call number is valid. */ + addi r11, r12, -__NR_syscalls + bgei r11, 1f /* return to user if not valid */ + /* Figure out which function to use for this system call. */ + /* Note Microblaze barrel shift is optional, so don't rely on it */ + add r12, r12, r12 /* convert num -> ptr */ + addik r30, r0, 1 /* restarts allowed */ + add r12, r12, r12 + lwi r12, r12, sys_call_table /* Get function pointer */ + addik r15, r0, ret_to_user-8 /* set return address */ + bra r12 /* Make the system call. */ + bri 0 /* won't reach here */ +1: + brid ret_to_user /* jump to syscall epilogue */ + addi r3, r0, -ENOSYS /* set errno in delay slot */ + +/* + * Debug traps are like a system call, but entered via brki r14, 0x60 + * All we need to do is send the SIGTRAP signal to current, ptrace and + * do_notify_resume will handle the rest + */ +ENTRY(_debug_exception) + swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ + lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ + lwi r1, r1, TS_THREAD_INFO /* get the thread info */ + addik r1, r1, THREAD_SIZE - PT_SIZE /* get the kernel stack */ + swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ + lwi r11, r0, PER_CPU(KM) /* load mode indicator */ +//save_context: + swi r11, r1, PT_MODE /* store the mode */ + lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ + /* save them on stack */ + swi r2, r1, PT_R2 + swi r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */ + swi r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */ + swi r5, r1, PT_R5 + swi r6, r1, PT_R6 + swi r7, r1, PT_R7 + swi r8, r1, PT_R8 + swi r9, r1, PT_R9 + swi r10, r1, PT_R10 + swi r11, r1, PT_R11 + /* r12: _always_ in clobber list; see unistd.h */ + swi r12, r1, PT_R12 + swi r13, r1, PT_R13 + /* r14: _always_ in clobber list; see unistd.h */ + swi r14, r1, PT_R14 + swi r14, r1, PT_PC /* Will return to interrupted instruction */ + swi r15, r1, PT_R15 + swi r16, r1, PT_R16 + swi r17, r1, PT_R17 + swi r18, r1, PT_R18 + swi r19, r1, PT_R19 + swi r20, r1, PT_R20 + swi r21, r1, PT_R21 + swi r22, r1, PT_R22 + swi r23, r1, PT_R23 + swi r24, r1, PT_R24 + swi r25, r1, PT_R25 + swi r26, r1, PT_R26 + swi r27, r1, PT_R27 + swi r28, r1, PT_R28 + swi r29, r1, PT_R29 + swi r30, r1, PT_R30 + swi r31, r1, PT_R31 + + disable_irq + nop /* make sure IE bit is in effect */ + clear_bip /* once IE is in effect it is safe to clear BIP */ + nop + + /* special purpose registers */ + mfs r11, rmsr + swi r11, r1, PT_MSR + mfs r11, rear + swi r11, r1, PT_EAR + mfs r11, resr + swi r11, r1, PT_ESR + mfs r11, rfsr + swi r11, r1, PT_FSR + /* reload original stack pointer and save it */ + lwi r11, r0, PER_CPU(ENTRY_SP) + swi r11, r1, PT_R1 + /* update mode indicator we are in kernel mode */ + addik r11, r0, 1 + swi r11, r0, PER_CPU(KM) + /* restore r31 */ + lwi r31, r0, PER_CPU(CURRENT_SAVE) + /* re-enable interrupts now we are in kernel mode */ + enable_irq + + addi r5, r0, SIGTRAP /* sending the trap signal */ + add r6, r0, r31 /* to current */ + bralid r15, send_sig + add r7, r0, r0 /* 3rd param zero */ + + addik r30, r0, 1 /* restarts allowed ??? */ + /* Restore r3/r4 to work around how ret_to_user works */ + lwi r3, r1, PT_R3 + lwi r4, r1, PT_R4 + bri ret_to_user + +ENTRY(_break) + bri 0 + +/* struct task_struct *_switch_to(struct thread_info *prev, + struct thread_info *next); */ +ENTRY(_switch_to) + /* prepare return value */ + addk r3, r0, r31 + + /* save registers in cpu_context */ + /* use r11 and r12, volatile registers, as temp register */ + addik r11, r5, TI_CPU_CONTEXT + swi r1, r11, CC_R1 + swi r2, r11, CC_R2 + /* skip volatile registers. + * they are saved on stack when we jumped to _switch_to() */ + /* dedicated registers */ + swi r13, r11, CC_R13 + swi r14, r11, CC_R14 + swi r15, r11, CC_R15 + swi r16, r11, CC_R16 + swi r17, r11, CC_R17 + swi r18, r11, CC_R18 + /* save non-volatile registers */ + swi r19, r11, CC_R19 + swi r20, r11, CC_R20 + swi r21, r11, CC_R21 + swi r22, r11, CC_R22 + swi r23, r11, CC_R23 + swi r24, r11, CC_R24 + swi r25, r11, CC_R25 + swi r26, r11, CC_R26 + swi r27, r11, CC_R27 + swi r28, r11, CC_R28 + swi r29, r11, CC_R29 + swi r30, r11, CC_R30 + /* special purpose registers */ + mfs r12, rmsr + swi r12, r11, CC_MSR + mfs r12, rear + swi r12, r11, CC_EAR + mfs r12, resr + swi r12, r11, CC_ESR + mfs r12, rfsr + swi r12, r11, CC_FSR + + /* update r31, the current */ + lwi r31, r6, TI_TASK + swi r31, r0, PER_CPU(CURRENT_SAVE) + + /* get new process' cpu context and restore */ + addik r11, r6, TI_CPU_CONTEXT + + /* special purpose registers */ + lwi r12, r11, CC_FSR + mts rfsr, r12 + lwi r12, r11, CC_ESR + mts resr, r12 + lwi r12, r11, CC_EAR + mts rear, r12 + lwi r12, r11, CC_MSR + mts rmsr, r12 + /* non-volatile registers */ + lwi r30, r11, CC_R30 + lwi r29, r11, CC_R29 + lwi r28, r11, CC_R28 + lwi r27, r11, CC_R27 + lwi r26, r11, CC_R26 + lwi r25, r11, CC_R25 + lwi r24, r11, CC_R24 + lwi r23, r11, CC_R23 + lwi r22, r11, CC_R22 + lwi r21, r11, CC_R21 + lwi r20, r11, CC_R20 + lwi r19, r11, CC_R19 + /* dedicated registers */ + lwi r18, r11, CC_R18 + lwi r17, r11, CC_R17 + lwi r16, r11, CC_R16 + lwi r15, r11, CC_R15 + lwi r14, r11, CC_R14 + lwi r13, r11, CC_R13 + /* skip volatile registers */ + lwi r2, r11, CC_R2 + lwi r1, r11, CC_R1 + + rtsd r15, 8 + nop + +ENTRY(ret_from_fork) + addk r5, r0, r3 + brlid r15, schedule_tail + nop + swi r31, r1, PT_R31 /* save r31 in user context. */ + /* will soon be restored to r31 in ret_to_user */ + addk r3, r0, r0 + brid ret_to_user + nop + +ENTRY(ret_from_kernel_thread) + brlid r15, schedule_tail + addk r5, r0, r3 + brald r15, r20 + addk r5, r0, r19 + brid ret_to_user + addk r3, r0, r0 + +work_pending: + lwi r11, r1, PT_MODE + bneid r11, 2f +3: + enable_irq + andi r11, r19, _TIF_NEED_RESCHED + beqi r11, 1f + bralid r15, schedule + nop + bri 4f +1: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME + beqi r11, no_work_pending + addk r5, r30, r0 + bralid r15, do_notify_resume + addik r6, r0, 1 + addk r30, r0, r0 /* no restarts from now on */ +4: + disable_irq + lwi r6, r31, TS_THREAD_INFO /* get thread info */ + lwi r19, r6, TI_FLAGS /* get flags in thread info */ + bri 3b + +ENTRY(ret_to_user) + disable_irq + + swi r4, r1, PT_R4 /* return val */ + swi r3, r1, PT_R3 /* return val */ + + lwi r6, r31, TS_THREAD_INFO /* get thread info */ + lwi r19, r6, TI_FLAGS /* get flags in thread info */ + bnei r19, work_pending /* do an extra work if any bits are set */ +no_work_pending: + disable_irq + +2: + /* save r31 */ + swi r31, r0, PER_CPU(CURRENT_SAVE) + /* save mode indicator */ + lwi r18, r1, PT_MODE + swi r18, r0, PER_CPU(KM) +//restore_context: + /* special purpose registers */ + lwi r18, r1, PT_FSR + mts rfsr, r18 + lwi r18, r1, PT_ESR + mts resr, r18 + lwi r18, r1, PT_EAR + mts rear, r18 + lwi r18, r1, PT_MSR + mts rmsr, r18 + + lwi r31, r1, PT_R31 + lwi r30, r1, PT_R30 + lwi r29, r1, PT_R29 + lwi r28, r1, PT_R28 + lwi r27, r1, PT_R27 + lwi r26, r1, PT_R26 + lwi r25, r1, PT_R25 + lwi r24, r1, PT_R24 + lwi r23, r1, PT_R23 + lwi r22, r1, PT_R22 + lwi r21, r1, PT_R21 + lwi r20, r1, PT_R20 + lwi r19, r1, PT_R19 + lwi r18, r1, PT_R18 + lwi r17, r1, PT_R17 + lwi r16, r1, PT_R16 + lwi r15, r1, PT_R15 + lwi r14, r1, PT_PC + lwi r13, r1, PT_R13 + lwi r12, r1, PT_R12 + lwi r11, r1, PT_R11 + lwi r10, r1, PT_R10 + lwi r9, r1, PT_R9 + lwi r8, r1, PT_R8 + lwi r7, r1, PT_R7 + lwi r6, r1, PT_R6 + lwi r5, r1, PT_R5 + lwi r4, r1, PT_R4 /* return val */ + lwi r3, r1, PT_R3 /* return val */ + lwi r2, r1, PT_R2 + lwi r1, r1, PT_R1 + + rtid r14, 0 + nop + +sys_rt_sigreturn_wrapper: + addk r30, r0, r0 /* no restarts for this one */ + brid sys_rt_sigreturn + addk r5, r1, r0 + + /* Interrupt vector table */ + .section .init.ivt, "ax" + .org 0x0 + brai _reset + brai _user_exception + brai _interrupt + brai _break + brai _hw_exception_handler + .org 0x60 + brai _debug_exception + +.section .rodata,"a" +#include "syscall_table.S" + +syscall_table_size=(.-sys_call_table) + +type_SYSCALL: + .ascii "SYSCALL\0" +type_IRQ: + .ascii "IRQ\0" +type_IRQ_PREEMPT: + .ascii "IRQ (PREEMPTED)\0" +type_SYSCALL_PREEMPT: + .ascii " SYSCALL (PREEMPTED)\0" + + /* + * Trap decoding for stack unwinder + * Tuples are (start addr, end addr, string) + * If return address lies on [start addr, end addr], + * unwinder displays 'string' + */ + + .align 4 +.global microblaze_trap_handlers +microblaze_trap_handlers: + /* Exact matches come first */ + .word ret_to_user ; .word ret_to_user ; .word type_SYSCALL + .word ret_from_intr; .word ret_from_intr ; .word type_IRQ + /* Fuzzy matches go here */ + .word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT + .word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT + /* End of table */ + .word 0 ; .word 0 ; .word 0 diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S new file mode 100644 index 000000000..4e1b567be --- /dev/null +++ b/arch/microblaze/kernel/entry.S @@ -0,0 +1,1015 @@ +/* + * Low-level system-call handling, trap handlers and context-switching + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> + * Copyright (C) 2001,2002 NEC Corporation + * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + * Heavily modified by John Williams for Microblaze + */ + +#include <linux/sys.h> +#include <linux/linkage.h> + +#include <asm/entry.h> +#include <asm/current.h> +#include <asm/processor.h> +#include <asm/exceptions.h> +#include <asm/asm-offsets.h> +#include <asm/thread_info.h> + +#include <asm/page.h> +#include <asm/unistd.h> + +#include <linux/errno.h> +#include <asm/signal.h> + +#undef DEBUG + +#ifdef DEBUG +/* Create space for syscalls counting. */ +.section .data +.global syscall_debug_table +.align 4 +syscall_debug_table: + .space (__NR_syscalls * 4) +#endif /* DEBUG */ + +#define C_ENTRY(name) .globl name; .align 4; name + +/* + * Various ways of setting and clearing BIP in flags reg. + * This is mucky, but necessary using microblaze version that + * allows msr ops to write to BIP + */ +#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR + .macro clear_bip + msrclr r0, MSR_BIP + .endm + + .macro set_bip + msrset r0, MSR_BIP + .endm + + .macro clear_eip + msrclr r0, MSR_EIP + .endm + + .macro set_ee + msrset r0, MSR_EE + .endm + + .macro disable_irq + msrclr r0, MSR_IE + .endm + + .macro enable_irq + msrset r0, MSR_IE + .endm + + .macro set_ums + msrset r0, MSR_UMS + msrclr r0, MSR_VMS + .endm + + .macro set_vms + msrclr r0, MSR_UMS + msrset r0, MSR_VMS + .endm + + .macro clear_ums + msrclr r0, MSR_UMS + .endm + + .macro clear_vms_ums + msrclr r0, MSR_VMS | MSR_UMS + .endm +#else + .macro clear_bip + mfs r11, rmsr + andi r11, r11, ~MSR_BIP + mts rmsr, r11 + .endm + + .macro set_bip + mfs r11, rmsr + ori r11, r11, MSR_BIP + mts rmsr, r11 + .endm + + .macro clear_eip + mfs r11, rmsr + andi r11, r11, ~MSR_EIP + mts rmsr, r11 + .endm + + .macro set_ee + mfs r11, rmsr + ori r11, r11, MSR_EE + mts rmsr, r11 + .endm + + .macro disable_irq + mfs r11, rmsr + andi r11, r11, ~MSR_IE + mts rmsr, r11 + .endm + + .macro enable_irq + mfs r11, rmsr + ori r11, r11, MSR_IE + mts rmsr, r11 + .endm + + .macro set_ums + mfs r11, rmsr + ori r11, r11, MSR_VMS + andni r11, r11, MSR_UMS + mts rmsr, r11 + .endm + + .macro set_vms + mfs r11, rmsr + ori r11, r11, MSR_VMS + andni r11, r11, MSR_UMS + mts rmsr, r11 + .endm + + .macro clear_ums + mfs r11, rmsr + andni r11, r11, MSR_UMS + mts rmsr,r11 + .endm + + .macro clear_vms_ums + mfs r11, rmsr + andni r11, r11, (MSR_VMS|MSR_UMS) + mts rmsr,r11 + .endm +#endif + +/* Define how to call high-level functions. With MMU, virtual mode must be + * enabled when calling the high-level function. Clobbers R11. + * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL + */ + +/* turn on virtual protected mode save */ +#define VM_ON \ + set_ums; \ + rted r0, 2f; \ + nop; \ +2: + +/* turn off virtual protected mode save and user mode save*/ +#define VM_OFF \ + clear_vms_ums; \ + rted r0, TOPHYS(1f); \ + nop; \ +1: + +#define SAVE_REGS \ + swi r2, r1, PT_R2; /* Save SDA */ \ + swi r3, r1, PT_R3; \ + swi r4, r1, PT_R4; \ + swi r5, r1, PT_R5; \ + swi r6, r1, PT_R6; \ + swi r7, r1, PT_R7; \ + swi r8, r1, PT_R8; \ + swi r9, r1, PT_R9; \ + swi r10, r1, PT_R10; \ + swi r11, r1, PT_R11; /* save clobbered regs after rval */\ + swi r12, r1, PT_R12; \ + swi r13, r1, PT_R13; /* Save SDA2 */ \ + swi r14, r1, PT_PC; /* PC, before IRQ/trap */ \ + swi r15, r1, PT_R15; /* Save LP */ \ + swi r16, r1, PT_R16; \ + swi r17, r1, PT_R17; \ + swi r18, r1, PT_R18; /* Save asm scratch reg */ \ + swi r19, r1, PT_R19; \ + swi r20, r1, PT_R20; \ + swi r21, r1, PT_R21; \ + swi r22, r1, PT_R22; \ + swi r23, r1, PT_R23; \ + swi r24, r1, PT_R24; \ + swi r25, r1, PT_R25; \ + swi r26, r1, PT_R26; \ + swi r27, r1, PT_R27; \ + swi r28, r1, PT_R28; \ + swi r29, r1, PT_R29; \ + swi r30, r1, PT_R30; \ + swi r31, r1, PT_R31; /* Save current task reg */ \ + mfs r11, rmsr; /* save MSR */ \ + swi r11, r1, PT_MSR; + +#define RESTORE_REGS_GP \ + lwi r2, r1, PT_R2; /* restore SDA */ \ + lwi r3, r1, PT_R3; \ + lwi r4, r1, PT_R4; \ + lwi r5, r1, PT_R5; \ + lwi r6, r1, PT_R6; \ + lwi r7, r1, PT_R7; \ + lwi r8, r1, PT_R8; \ + lwi r9, r1, PT_R9; \ + lwi r10, r1, PT_R10; \ + lwi r11, r1, PT_R11; /* restore clobbered regs after rval */\ + lwi r12, r1, PT_R12; \ + lwi r13, r1, PT_R13; /* restore SDA2 */ \ + lwi r14, r1, PT_PC; /* RESTORE_LINK PC, before IRQ/trap */\ + lwi r15, r1, PT_R15; /* restore LP */ \ + lwi r16, r1, PT_R16; \ + lwi r17, r1, PT_R17; \ + lwi r18, r1, PT_R18; /* restore asm scratch reg */ \ + lwi r19, r1, PT_R19; \ + lwi r20, r1, PT_R20; \ + lwi r21, r1, PT_R21; \ + lwi r22, r1, PT_R22; \ + lwi r23, r1, PT_R23; \ + lwi r24, r1, PT_R24; \ + lwi r25, r1, PT_R25; \ + lwi r26, r1, PT_R26; \ + lwi r27, r1, PT_R27; \ + lwi r28, r1, PT_R28; \ + lwi r29, r1, PT_R29; \ + lwi r30, r1, PT_R30; \ + lwi r31, r1, PT_R31; /* Restore cur task reg */ + +#define RESTORE_REGS \ + lwi r11, r1, PT_MSR; \ + mts rmsr , r11; \ + RESTORE_REGS_GP + +#define RESTORE_REGS_RTBD \ + lwi r11, r1, PT_MSR; \ + andni r11, r11, MSR_EIP; /* clear EIP */ \ + ori r11, r11, MSR_EE | MSR_BIP; /* set EE and BIP */ \ + mts rmsr , r11; \ + RESTORE_REGS_GP + +#define SAVE_STATE \ + swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */ \ + /* See if already in kernel mode.*/ \ + mfs r1, rmsr; \ + andi r1, r1, MSR_UMS; \ + bnei r1, 1f; \ + /* Kernel-mode state save. */ \ + /* Reload kernel stack-ptr. */ \ + lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ + /* FIXME: I can add these two lines to one */ \ + /* tophys(r1,r1); */ \ + /* addik r1, r1, -PT_SIZE; */ \ + addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; \ + SAVE_REGS \ + brid 2f; \ + swi r1, r1, PT_MODE; \ +1: /* User-mode state save. */ \ + lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\ + tophys(r1,r1); \ + lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \ + /* MS these three instructions can be added to one */ \ + /* addik r1, r1, THREAD_SIZE; */ \ + /* tophys(r1,r1); */ \ + /* addik r1, r1, -PT_SIZE; */ \ + addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; \ + SAVE_REGS \ + lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \ + swi r11, r1, PT_R1; /* Store user SP. */ \ + swi r0, r1, PT_MODE; /* Was in user-mode. */ \ + /* MS: I am clearing UMS even in case when I come from kernel space */ \ + clear_ums; \ +2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + +.text + +/* + * User trap. + * + * System calls are handled here. + * + * Syscall protocol: + * Syscall number in r12, args in r5-r10 + * Return value in r3 + * + * Trap entered via brki instruction, so BIP bit is set, and interrupts + * are masked. This is nice, means we don't have to CLI before state save + */ +C_ENTRY(_user_exception): + swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ + addi r14, r14, 4 /* return address is 4 byte after call */ + + lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ + tophys(r1,r1); + lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ +/* calculate kernel stack pointer from task struct 8k */ + addik r1, r1, THREAD_SIZE; + tophys(r1,r1); + + addik r1, r1, -PT_SIZE; /* Make room on the stack. */ + SAVE_REGS + swi r0, r1, PT_R3 + swi r0, r1, PT_R4 + + swi r0, r1, PT_MODE; /* Was in user-mode. */ + lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); + swi r11, r1, PT_R1; /* Store user SP. */ + clear_ums; +2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + /* Save away the syscall number. */ + swi r12, r1, PT_R0; + tovirt(r1,r1) + +/* where the trap should return need -8 to adjust for rtsd r15, 8*/ +/* Jump to the appropriate function for the system call number in r12 + * (r12 is not preserved), or return an error if r12 is not valid. The LP + * register should point to the location where + * the called function should return. [note that MAKE_SYS_CALL uses label 1] */ + + /* Step into virtual mode */ + rtbd r0, 3f + nop +3: + lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */ + lwi r11, r11, TI_FLAGS /* get flags in thread info */ + andi r11, r11, _TIF_WORK_SYSCALL_MASK + beqi r11, 4f + + addik r3, r0, -ENOSYS + swi r3, r1, PT_R3 + brlid r15, do_syscall_trace_enter + addik r5, r1, PT_R0 + + # do_syscall_trace_enter returns the new syscall nr. + addk r12, r0, r3 + lwi r5, r1, PT_R5; + lwi r6, r1, PT_R6; + lwi r7, r1, PT_R7; + lwi r8, r1, PT_R8; + lwi r9, r1, PT_R9; + lwi r10, r1, PT_R10; +4: +/* Jump to the appropriate function for the system call number in r12 + * (r12 is not preserved), or return an error if r12 is not valid. + * The LP register should point to the location where the called function + * should return. [note that MAKE_SYS_CALL uses label 1] */ + /* See if the system call number is valid */ + blti r12, 5f + addi r11, r12, -__NR_syscalls; + bgei r11, 5f; + /* Figure out which function to use for this system call. */ + /* Note Microblaze barrel shift is optional, so don't rely on it */ + add r12, r12, r12; /* convert num -> ptr */ + add r12, r12, r12; + addi r30, r0, 1 /* restarts allowed */ + +#ifdef DEBUG + /* Trac syscalls and stored them to syscall_debug_table */ + /* The first syscall location stores total syscall number */ + lwi r3, r0, syscall_debug_table + addi r3, r3, 1 + swi r3, r0, syscall_debug_table + lwi r3, r12, syscall_debug_table + addi r3, r3, 1 + swi r3, r12, syscall_debug_table +#endif + + # Find and jump into the syscall handler. + lwi r12, r12, sys_call_table + /* where the trap should return need -8 to adjust for rtsd r15, 8 */ + addi r15, r0, ret_from_trap-8 + bra r12 + + /* The syscall number is invalid, return an error. */ +5: + braid ret_from_trap + addi r3, r0, -ENOSYS; + +/* Entry point used to return from a syscall/trap */ +/* We re-enable BIP bit before state restore */ +C_ENTRY(ret_from_trap): + swi r3, r1, PT_R3 + swi r4, r1, PT_R4 + + lwi r11, r1, PT_MODE; +/* See if returning to kernel mode, if so, skip resched &c. */ + bnei r11, 2f; + /* We're returning to user mode, so check for various conditions that + * trigger rescheduling. */ + /* FIXME: Restructure all these flag checks. */ + lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ + lwi r11, r11, TI_FLAGS; /* get flags in thread info */ + andi r11, r11, _TIF_WORK_SYSCALL_MASK + beqi r11, 1f + + brlid r15, do_syscall_trace_leave + addik r5, r1, PT_R0 +1: + /* We're returning to user mode, so check for various conditions that + * trigger rescheduling. */ + /* get thread info from current task */ + lwi r11, CURRENT_TASK, TS_THREAD_INFO; + lwi r19, r11, TI_FLAGS; /* get flags in thread info */ + andi r11, r19, _TIF_NEED_RESCHED; + beqi r11, 5f; + + bralid r15, schedule; /* Call scheduler */ + nop; /* delay slot */ + bri 1b + + /* Maybe handle a signal */ +5: + andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; + beqi r11, 4f; /* Signals to handle, handle them */ + + addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ + bralid r15, do_notify_resume; /* Handle any signals */ + add r6, r30, r0; /* Arg 2: int in_syscall */ + add r30, r0, r0 /* no more restarts */ + bri 1b + +/* Finally, return to user state. */ +4: set_bip; /* Ints masked for state restore */ + swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ + VM_OFF; + tophys(r1,r1); + RESTORE_REGS_RTBD; + addik r1, r1, PT_SIZE /* Clean up stack space. */ + lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */ + bri 6f; + +/* Return to kernel state. */ +2: set_bip; /* Ints masked for state restore */ + VM_OFF; + tophys(r1,r1); + RESTORE_REGS_RTBD; + addik r1, r1, PT_SIZE /* Clean up stack space. */ + tovirt(r1,r1); +6: +TRAP_return: /* Make global symbol for debugging */ + rtbd r14, 0; /* Instructions to return from an IRQ */ + nop; + + +/* This the initial entry point for a new child thread, with an appropriate + stack in place that makes it look the the child is in the middle of an + syscall. This function is actually `returned to' from switch_thread + (copy_thread makes ret_from_fork the return address in each new thread's + saved context). */ +C_ENTRY(ret_from_fork): + bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ + add r5, r3, r0; /* switch_thread returns the prev task */ + /* ( in the delay slot ) */ + brid ret_from_trap; /* Do normal trap return */ + add r3, r0, r0; /* Child's fork call should return 0. */ + +C_ENTRY(ret_from_kernel_thread): + bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ + add r5, r3, r0; /* switch_thread returns the prev task */ + /* ( in the delay slot ) */ + brald r15, r20 /* fn was left in r20 */ + addk r5, r0, r19 /* ... and argument - in r19 */ + brid ret_from_trap + add r3, r0, r0 + +C_ENTRY(sys_rt_sigreturn_wrapper): + addik r30, r0, 0 /* no restarts */ + brid sys_rt_sigreturn /* Do real work */ + addik r5, r1, 0; /* add user context as 1st arg */ + +/* + * HW EXCEPTION rutine start + */ +C_ENTRY(full_exception_trap): + /* adjust exception address for privileged instruction + * for finding where is it */ + addik r17, r17, -4 + SAVE_STATE /* Save registers */ + /* PC, before IRQ/trap - this is one instruction above */ + swi r17, r1, PT_PC; + tovirt(r1,r1) + /* FIXME this can be store directly in PT_ESR reg. + * I tested it but there is a fault */ + /* where the trap should return need -8 to adjust for rtsd r15, 8 */ + addik r15, r0, ret_from_exc - 8 + mfs r6, resr + mfs r7, rfsr; /* save FSR */ + mts rfsr, r0; /* Clear sticky fsr */ + rted r0, full_exception + addik r5, r1, 0 /* parameter struct pt_regs * regs */ + +/* + * Unaligned data trap. + * + * Unaligned data trap last on 4k page is handled here. + * + * Trap entered via exception, so EE bit is set, and interrupts + * are masked. This is nice, means we don't have to CLI before state save + * + * The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S" + */ +C_ENTRY(unaligned_data_trap): + /* MS: I have to save r11 value and then restore it because + * set_bit, clear_eip, set_ee use r11 as temp register if MSR + * instructions are not used. We don't need to do if MSR instructions + * are used and they use r0 instead of r11. + * I am using ENTRY_SP which should be primary used only for stack + * pointer saving. */ + swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); + set_bip; /* equalize initial state for all possible entries */ + clear_eip; + set_ee; + lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); + SAVE_STATE /* Save registers.*/ + /* PC, before IRQ/trap - this is one instruction above */ + swi r17, r1, PT_PC; + tovirt(r1,r1) + /* where the trap should return need -8 to adjust for rtsd r15, 8 */ + addik r15, r0, ret_from_exc-8 + mfs r3, resr /* ESR */ + mfs r4, rear /* EAR */ + rtbd r0, _unaligned_data_exception + addik r7, r1, 0 /* parameter struct pt_regs * regs */ + +/* + * Page fault traps. + * + * If the real exception handler (from hw_exception_handler.S) didn't find + * the mapping for the process, then we're thrown here to handle such situation. + * + * Trap entered via exceptions, so EE bit is set, and interrupts + * are masked. This is nice, means we don't have to CLI before state save + * + * Build a standard exception frame for TLB Access errors. All TLB exceptions + * will bail out to this point if they can't resolve the lightweight TLB fault. + * + * The C function called is in "arch/microblaze/mm/fault.c", declared as: + * void do_page_fault(struct pt_regs *regs, + * unsigned long address, + * unsigned long error_code) + */ +/* data and intruction trap - which is choose is resolved int fault.c */ +C_ENTRY(page_fault_data_trap): + SAVE_STATE /* Save registers.*/ + /* PC, before IRQ/trap - this is one instruction above */ + swi r17, r1, PT_PC; + tovirt(r1,r1) + /* where the trap should return need -8 to adjust for rtsd r15, 8 */ + addik r15, r0, ret_from_exc-8 + mfs r6, rear /* parameter unsigned long address */ + mfs r7, resr /* parameter unsigned long error_code */ + rted r0, do_page_fault + addik r5, r1, 0 /* parameter struct pt_regs * regs */ + +C_ENTRY(page_fault_instr_trap): + SAVE_STATE /* Save registers.*/ + /* PC, before IRQ/trap - this is one instruction above */ + swi r17, r1, PT_PC; + tovirt(r1,r1) + /* where the trap should return need -8 to adjust for rtsd r15, 8 */ + addik r15, r0, ret_from_exc-8 + mfs r6, rear /* parameter unsigned long address */ + ori r7, r0, 0 /* parameter unsigned long error_code */ + rted r0, do_page_fault + addik r5, r1, 0 /* parameter struct pt_regs * regs */ + +/* Entry point used to return from an exception. */ +C_ENTRY(ret_from_exc): + lwi r11, r1, PT_MODE; + bnei r11, 2f; /* See if returning to kernel mode, */ + /* ... if so, skip resched &c. */ + + /* We're returning to user mode, so check for various conditions that + trigger rescheduling. */ +1: + lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ + lwi r19, r11, TI_FLAGS; /* get flags in thread info */ + andi r11, r19, _TIF_NEED_RESCHED; + beqi r11, 5f; + +/* Call the scheduler before returning from a syscall/trap. */ + bralid r15, schedule; /* Call scheduler */ + nop; /* delay slot */ + bri 1b + + /* Maybe handle a signal */ +5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; + beqi r11, 4f; /* Signals to handle, handle them */ + + /* + * Handle a signal return; Pending signals should be in r18. + * + * Not all registers are saved by the normal trap/interrupt entry + * points (for instance, call-saved registers (because the normal + * C-compiler calling sequence in the kernel makes sure they're + * preserved), and call-clobbered registers in the case of + * traps), but signal handlers may want to examine or change the + * complete register state. Here we save anything not saved by + * the normal entry sequence, so that it may be safely restored + * (in a possibly modified form) after do_notify_resume returns. */ + addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ + bralid r15, do_notify_resume; /* Handle any signals */ + addi r6, r0, 0; /* Arg 2: int in_syscall */ + bri 1b + +/* Finally, return to user state. */ +4: set_bip; /* Ints masked for state restore */ + swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ + VM_OFF; + tophys(r1,r1); + + RESTORE_REGS_RTBD; + addik r1, r1, PT_SIZE /* Clean up stack space. */ + + lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */ + bri 6f; +/* Return to kernel state. */ +2: set_bip; /* Ints masked for state restore */ + VM_OFF; + tophys(r1,r1); + RESTORE_REGS_RTBD; + addik r1, r1, PT_SIZE /* Clean up stack space. */ + + tovirt(r1,r1); +6: +EXC_return: /* Make global symbol for debugging */ + rtbd r14, 0; /* Instructions to return from an IRQ */ + nop; + +/* + * HW EXCEPTION rutine end + */ + +/* + * Hardware maskable interrupts. + * + * The stack-pointer (r1) should have already been saved to the memory + * location PER_CPU(ENTRY_SP). + */ +C_ENTRY(_interrupt): +/* MS: we are in physical address */ +/* Save registers, switch to proper stack, convert SP to virtual.*/ + swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) + /* MS: See if already in kernel mode. */ + mfs r1, rmsr + nop + andi r1, r1, MSR_UMS + bnei r1, 1f + +/* Kernel-mode state save. */ + lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) + tophys(r1,r1); /* MS: I have in r1 physical address where stack is */ + /* save registers */ +/* MS: Make room on the stack -> activation record */ + addik r1, r1, -PT_SIZE; + SAVE_REGS + brid 2f; + swi r1, r1, PT_MODE; /* 0 - user mode, 1 - kernel mode */ +1: +/* User-mode state save. */ + /* MS: get the saved current */ + lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + tophys(r1,r1); + lwi r1, r1, TS_THREAD_INFO; + addik r1, r1, THREAD_SIZE; + tophys(r1,r1); + /* save registers */ + addik r1, r1, -PT_SIZE; + SAVE_REGS + /* calculate mode */ + swi r0, r1, PT_MODE; + lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); + swi r11, r1, PT_R1; + clear_ums; +2: + lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + tovirt(r1,r1) + addik r15, r0, irq_call; +irq_call:rtbd r0, do_IRQ; + addik r5, r1, 0; + +/* MS: we are in virtual mode */ +ret_from_irq: + lwi r11, r1, PT_MODE; + bnei r11, 2f; + +1: + lwi r11, CURRENT_TASK, TS_THREAD_INFO; + lwi r19, r11, TI_FLAGS; /* MS: get flags from thread info */ + andi r11, r19, _TIF_NEED_RESCHED; + beqi r11, 5f + bralid r15, schedule; + nop; /* delay slot */ + bri 1b + + /* Maybe handle a signal */ +5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; + beqid r11, no_intr_resched +/* Handle a signal return; Pending signals should be in r18. */ + addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ + bralid r15, do_notify_resume; /* Handle any signals */ + addi r6, r0, 0; /* Arg 2: int in_syscall */ + bri 1b + +/* Finally, return to user state. */ +no_intr_resched: + /* Disable interrupts, we are now committed to the state restore */ + disable_irq + swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); + VM_OFF; + tophys(r1,r1); + RESTORE_REGS + addik r1, r1, PT_SIZE /* MS: Clean up stack space. */ + lwi r1, r1, PT_R1 - PT_SIZE; + bri 6f; +/* MS: Return to kernel state. */ +2: +#ifdef CONFIG_PREEMPT + lwi r11, CURRENT_TASK, TS_THREAD_INFO; + /* MS: get preempt_count from thread info */ + lwi r5, r11, TI_PREEMPT_COUNT; + bgti r5, restore; + + lwi r5, r11, TI_FLAGS; /* get flags in thread info */ + andi r5, r5, _TIF_NEED_RESCHED; + beqi r5, restore /* if zero jump over */ + +preempt: + /* interrupts are off that's why I am calling preempt_chedule_irq */ + bralid r15, preempt_schedule_irq + nop + lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ + lwi r5, r11, TI_FLAGS; /* get flags in thread info */ + andi r5, r5, _TIF_NEED_RESCHED; + bnei r5, preempt /* if non zero jump to resched */ +restore: +#endif + VM_OFF /* MS: turn off MMU */ + tophys(r1,r1) + RESTORE_REGS + addik r1, r1, PT_SIZE /* MS: Clean up stack space. */ + tovirt(r1,r1); +6: +IRQ_return: /* MS: Make global symbol for debugging */ + rtid r14, 0 + nop + +/* + * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18 + * and call handling function with saved pt_regs + */ +C_ENTRY(_debug_exception): + /* BIP bit is set on entry, no interrupts can occur */ + swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) + + mfs r1, rmsr + nop + andi r1, r1, MSR_UMS + bnei r1, 1f +/* MS: Kernel-mode state save - kgdb */ + lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ + + /* BIP bit is set on entry, no interrupts can occur */ + addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE; + SAVE_REGS; + /* save all regs to pt_reg structure */ + swi r0, r1, PT_R0; /* R0 must be saved too */ + swi r14, r1, PT_R14 /* rewrite saved R14 value */ + swi r16, r1, PT_PC; /* PC and r16 are the same */ + /* save special purpose registers to pt_regs */ + mfs r11, rear; + swi r11, r1, PT_EAR; + mfs r11, resr; + swi r11, r1, PT_ESR; + mfs r11, rfsr; + swi r11, r1, PT_FSR; + + /* stack pointer is in physical address at it is decrease + * by PT_SIZE but we need to get correct R1 value */ + addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + PT_SIZE; + swi r11, r1, PT_R1 + /* MS: r31 - current pointer isn't changed */ + tovirt(r1,r1) +#ifdef CONFIG_KGDB + addi r5, r1, 0 /* pass pt_reg address as the first arg */ + addik r15, r0, dbtrap_call; /* return address */ + rtbd r0, microblaze_kgdb_break + nop; +#endif + /* MS: Place handler for brki from kernel space if KGDB is OFF. + * It is very unlikely that another brki instruction is called. */ + bri 0 + +/* MS: User-mode state save - gdb */ +1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ + tophys(r1,r1); + lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ + addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */ + tophys(r1,r1); + + addik r1, r1, -PT_SIZE; /* Make room on the stack. */ + SAVE_REGS; + swi r16, r1, PT_PC; /* Save LP */ + swi r0, r1, PT_MODE; /* Was in user-mode. */ + lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); + swi r11, r1, PT_R1; /* Store user SP. */ + lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + tovirt(r1,r1) + set_vms; + addik r5, r1, 0; + addik r15, r0, dbtrap_call; +dbtrap_call: /* Return point for kernel/user entry + 8 because of rtsd r15, 8 */ + rtbd r0, sw_exception + nop + + /* MS: The first instruction for the second part of the gdb/kgdb */ + set_bip; /* Ints masked for state restore */ + lwi r11, r1, PT_MODE; + bnei r11, 2f; +/* MS: Return to user space - gdb */ +1: + /* Get current task ptr into r11 */ + lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */ + lwi r19, r11, TI_FLAGS; /* get flags in thread info */ + andi r11, r19, _TIF_NEED_RESCHED; + beqi r11, 5f; + + /* Call the scheduler before returning from a syscall/trap. */ + bralid r15, schedule; /* Call scheduler */ + nop; /* delay slot */ + bri 1b + + /* Maybe handle a signal */ +5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME; + beqi r11, 4f; /* Signals to handle, handle them */ + + addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */ + bralid r15, do_notify_resume; /* Handle any signals */ + addi r6, r0, 0; /* Arg 2: int in_syscall */ + bri 1b + +/* Finally, return to user state. */ +4: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ + VM_OFF; + tophys(r1,r1); + /* MS: Restore all regs */ + RESTORE_REGS_RTBD + addik r1, r1, PT_SIZE /* Clean up stack space */ + lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */ +DBTRAP_return_user: /* MS: Make global symbol for debugging */ + rtbd r16, 0; /* MS: Instructions to return from a debug trap */ + nop; + +/* MS: Return to kernel state - kgdb */ +2: VM_OFF; + tophys(r1,r1); + /* MS: Restore all regs */ + RESTORE_REGS_RTBD + lwi r14, r1, PT_R14; + lwi r16, r1, PT_PC; + addik r1, r1, PT_SIZE; /* MS: Clean up stack space */ + tovirt(r1,r1); +DBTRAP_return_kernel: /* MS: Make global symbol for debugging */ + rtbd r16, 0; /* MS: Instructions to return from a debug trap */ + nop; + + +ENTRY(_switch_to) + /* prepare return value */ + addk r3, r0, CURRENT_TASK + + /* save registers in cpu_context */ + /* use r11 and r12, volatile registers, as temp register */ + /* give start of cpu_context for previous process */ + addik r11, r5, TI_CPU_CONTEXT + swi r1, r11, CC_R1 + swi r2, r11, CC_R2 + /* skip volatile registers. + * they are saved on stack when we jumped to _switch_to() */ + /* dedicated registers */ + swi r13, r11, CC_R13 + swi r14, r11, CC_R14 + swi r15, r11, CC_R15 + swi r16, r11, CC_R16 + swi r17, r11, CC_R17 + swi r18, r11, CC_R18 + /* save non-volatile registers */ + swi r19, r11, CC_R19 + swi r20, r11, CC_R20 + swi r21, r11, CC_R21 + swi r22, r11, CC_R22 + swi r23, r11, CC_R23 + swi r24, r11, CC_R24 + swi r25, r11, CC_R25 + swi r26, r11, CC_R26 + swi r27, r11, CC_R27 + swi r28, r11, CC_R28 + swi r29, r11, CC_R29 + swi r30, r11, CC_R30 + /* special purpose registers */ + mfs r12, rmsr + swi r12, r11, CC_MSR + mfs r12, rear + swi r12, r11, CC_EAR + mfs r12, resr + swi r12, r11, CC_ESR + mfs r12, rfsr + swi r12, r11, CC_FSR + + /* update r31, the current-give me pointer to task which will be next */ + lwi CURRENT_TASK, r6, TI_TASK + /* stored it to current_save too */ + swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE) + + /* get new process' cpu context and restore */ + /* give me start where start context of next task */ + addik r11, r6, TI_CPU_CONTEXT + + /* non-volatile registers */ + lwi r30, r11, CC_R30 + lwi r29, r11, CC_R29 + lwi r28, r11, CC_R28 + lwi r27, r11, CC_R27 + lwi r26, r11, CC_R26 + lwi r25, r11, CC_R25 + lwi r24, r11, CC_R24 + lwi r23, r11, CC_R23 + lwi r22, r11, CC_R22 + lwi r21, r11, CC_R21 + lwi r20, r11, CC_R20 + lwi r19, r11, CC_R19 + /* dedicated registers */ + lwi r18, r11, CC_R18 + lwi r17, r11, CC_R17 + lwi r16, r11, CC_R16 + lwi r15, r11, CC_R15 + lwi r14, r11, CC_R14 + lwi r13, r11, CC_R13 + /* skip volatile registers */ + lwi r2, r11, CC_R2 + lwi r1, r11, CC_R1 + + /* special purpose registers */ + lwi r12, r11, CC_FSR + mts rfsr, r12 + lwi r12, r11, CC_MSR + mts rmsr, r12 + + rtsd r15, 8 + nop + +ENTRY(_reset) + brai 0; /* Jump to reset vector */ + + /* These are compiled and loaded into high memory, then + * copied into place in mach_early_setup */ + .section .init.ivt, "ax" +#if CONFIG_MANUAL_RESET_VECTOR + .org 0x0 + brai CONFIG_MANUAL_RESET_VECTOR +#endif + .org 0x8 + brai TOPHYS(_user_exception); /* syscall handler */ + .org 0x10 + brai TOPHYS(_interrupt); /* Interrupt handler */ + .org 0x18 + brai TOPHYS(_debug_exception); /* debug trap handler */ + .org 0x20 + brai TOPHYS(_hw_exception_handler); /* HW exception handler */ + +.section .rodata,"a" +#include "syscall_table.S" + +syscall_table_size=(.-sys_call_table) + +type_SYSCALL: + .ascii "SYSCALL\0" +type_IRQ: + .ascii "IRQ\0" +type_IRQ_PREEMPT: + .ascii "IRQ (PREEMPTED)\0" +type_SYSCALL_PREEMPT: + .ascii " SYSCALL (PREEMPTED)\0" + + /* + * Trap decoding for stack unwinder + * Tuples are (start addr, end addr, string) + * If return address lies on [start addr, end addr], + * unwinder displays 'string' + */ + + .align 4 +.global microblaze_trap_handlers +microblaze_trap_handlers: + /* Exact matches come first */ + .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL + .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ + /* Fuzzy matches go here */ + .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT + .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT + /* End of table */ + .word 0 ; .word 0 ; .word 0 diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c new file mode 100644 index 000000000..eafff21fc --- /dev/null +++ b/arch/microblaze/kernel/exceptions.c @@ -0,0 +1,149 @@ +/* + * HW exception handling + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +/* + * This file handles the architecture-dependent parts of hardware exceptions + */ + +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/kallsyms.h> + +#include <asm/exceptions.h> +#include <asm/entry.h> /* For KM CPU var */ +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <linux/ptrace.h> +#include <asm/current.h> +#include <asm/cacheflush.h> + +#define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02 +#define MICROBLAZE_IBUS_EXCEPTION 0x03 +#define MICROBLAZE_DBUS_EXCEPTION 0x04 +#define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05 +#define MICROBLAZE_FPU_EXCEPTION 0x06 +#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 + +static DEFINE_SPINLOCK(die_lock); + +void die(const char *str, struct pt_regs *fp, long err) +{ + console_verbose(); + spin_lock_irq(&die_lock); + pr_warn("Oops: %s, sig: %ld\n", str, err); + show_regs(fp); + spin_unlock_irq(&die_lock); + /* do_exit() should take care of panic'ing from an interrupt + * context so we don't handle it here + */ + do_exit(err); +} + +/* for user application debugging */ +asmlinkage void sw_exception(struct pt_regs *regs) +{ + _exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16); + flush_dcache_range(regs->r16, regs->r16 + 0x4); + flush_icache_range(regs->r16, regs->r16 + 0x4); +} + +void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) +{ + if (kernel_mode(regs)) + die("Exception in kernel mode", regs, signr); + + force_sig_fault(signr, code, (void __user *)addr, current); +} + +asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, + int fsr, int addr) +{ +#ifdef CONFIG_MMU + addr = regs->pc; +#endif + +#if 0 + pr_warn("Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n", + type, user_mode(regs) ? "user" : "kernel", fsr, + (unsigned int) regs->pc, (unsigned int) regs->esr); +#endif + + switch (type & 0x1F) { + case MICROBLAZE_ILL_OPCODE_EXCEPTION: + if (user_mode(regs)) { + pr_debug("Illegal opcode exception in user mode\n"); + _exception(SIGILL, regs, ILL_ILLOPC, addr); + return; + } + pr_warn("Illegal opcode exception in kernel mode.\n"); + die("opcode exception", regs, SIGBUS); + break; + case MICROBLAZE_IBUS_EXCEPTION: + if (user_mode(regs)) { + pr_debug("Instruction bus error exception in user mode\n"); + _exception(SIGBUS, regs, BUS_ADRERR, addr); + return; + } + pr_warn("Instruction bus error exception in kernel mode.\n"); + die("bus exception", regs, SIGBUS); + break; + case MICROBLAZE_DBUS_EXCEPTION: + if (user_mode(regs)) { + pr_debug("Data bus error exception in user mode\n"); + _exception(SIGBUS, regs, BUS_ADRERR, addr); + return; + } + pr_warn("Data bus error exception in kernel mode.\n"); + die("bus exception", regs, SIGBUS); + break; + case MICROBLAZE_DIV_ZERO_EXCEPTION: + if (user_mode(regs)) { + pr_debug("Divide by zero exception in user mode\n"); + _exception(SIGFPE, regs, FPE_INTDIV, addr); + return; + } + pr_warn("Divide by zero exception in kernel mode.\n"); + die("Divide by zero exception", regs, SIGBUS); + break; + case MICROBLAZE_FPU_EXCEPTION: + pr_debug("FPU exception\n"); + /* IEEE FP exception */ + /* I removed fsr variable and use code var for storing fsr */ + if (fsr & FSR_IO) + fsr = FPE_FLTINV; + else if (fsr & FSR_OF) + fsr = FPE_FLTOVF; + else if (fsr & FSR_UF) + fsr = FPE_FLTUND; + else if (fsr & FSR_DZ) + fsr = FPE_FLTDIV; + else if (fsr & FSR_DO) + fsr = FPE_FLTRES; + _exception(SIGFPE, regs, fsr, addr); + break; + +#ifdef CONFIG_MMU + case MICROBLAZE_PRIVILEGED_EXCEPTION: + pr_debug("Privileged exception\n"); + _exception(SIGILL, regs, ILL_PRVOPC, addr); + break; +#endif + default: + /* FIXME what to do in unexpected exception */ + pr_warn("Unexpected exception %02x PC=%08x in %s mode\n", + type, (unsigned int) addr, + kernel_mode(regs) ? "kernel" : "user"); + } + return; +} diff --git a/arch/microblaze/kernel/ftrace.c b/arch/microblaze/kernel/ftrace.c new file mode 100644 index 000000000..224eea40e --- /dev/null +++ b/arch/microblaze/kernel/ftrace.c @@ -0,0 +1,222 @@ +/* + * Ftrace support for Microblaze. + * + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * Based on MIPS and PowerPC ftrace code + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <asm/cacheflush.h> +#include <linux/ftrace.h> + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +/* + * Hook the return address and push it in the stack of return addrs + * in current thread info. + */ +void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) +{ + unsigned long old; + int faulted; + unsigned long return_hooker = (unsigned long) + &return_to_handler; + + if (unlikely(ftrace_graph_is_dead())) + return; + + if (unlikely(atomic_read(¤t->tracing_graph_pause))) + return; + + /* + * Protect against fault, even if it shouldn't + * happen. This tool is too much intrusive to + * ignore such a protection. + */ + asm volatile(" 1: lwi %0, %2, 0;" \ + "2: swi %3, %2, 0;" \ + " addik %1, r0, 0;" \ + "3:" \ + " .section .fixup, \"ax\";" \ + "4: brid 3b;" \ + " addik %1, r0, 1;" \ + " .previous;" \ + " .section __ex_table,\"a\";" \ + " .word 1b,4b;" \ + " .word 2b,4b;" \ + " .previous;" \ + : "=&r" (old), "=r" (faulted) + : "r" (parent), "r" (return_hooker) + ); + + flush_dcache_range((u32)parent, (u32)parent + 4); + flush_icache_range((u32)parent, (u32)parent + 4); + + if (unlikely(faulted)) { + ftrace_graph_stop(); + WARN_ON(1); + return; + } + + if (function_graph_enter(old, self_addr, 0, NULL)) + *parent = old; +} +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + +#ifdef CONFIG_DYNAMIC_FTRACE +/* save value to addr - it is save to do it in asm */ +static int ftrace_modify_code(unsigned long addr, unsigned int value) +{ + int faulted = 0; + + __asm__ __volatile__(" 1: swi %2, %1, 0;" \ + " addik %0, r0, 0;" \ + "2:" \ + " .section .fixup, \"ax\";" \ + "3: brid 2b;" \ + " addik %0, r0, 1;" \ + " .previous;" \ + " .section __ex_table,\"a\";" \ + " .word 1b,3b;" \ + " .previous;" \ + : "=r" (faulted) + : "r" (addr), "r" (value) + ); + + if (unlikely(faulted)) + return -EFAULT; + + flush_dcache_range(addr, addr + 4); + flush_icache_range(addr, addr + 4); + + return 0; +} + +#define MICROBLAZE_NOP 0x80000000 +#define MICROBLAZE_BRI 0xb800000C + +static unsigned int recorded; /* if save was or not */ +static unsigned int imm; /* saving whole imm instruction */ + +/* There are two approaches howto solve ftrace_make nop function - look below */ +#undef USE_FTRACE_NOP + +#ifdef USE_FTRACE_NOP +static unsigned int bralid; /* saving whole bralid instruction */ +#endif + +int ftrace_make_nop(struct module *mod, + struct dyn_ftrace *rec, unsigned long addr) +{ + /* we have this part of code which we are working with + * b000c000 imm -16384 + * b9fc8e30 bralid r15, -29136 // c0008e30 <_mcount> + * 80000000 or r0, r0, r0 + * + * The first solution (!USE_FTRACE_NOP-could be called branch solution) + * b000c000 bri 12 (0xC - jump to any other instruction) + * b9fc8e30 bralid r15, -29136 // c0008e30 <_mcount> + * 80000000 or r0, r0, r0 + * any other instruction + * + * The second solution (USE_FTRACE_NOP) - no jump just nops + * 80000000 or r0, r0, r0 + * 80000000 or r0, r0, r0 + * 80000000 or r0, r0, r0 + */ + int ret = 0; + + if (recorded == 0) { + recorded = 1; + imm = *(unsigned int *)rec->ip; + pr_debug("%s: imm:0x%x\n", __func__, imm); +#ifdef USE_FTRACE_NOP + bralid = *(unsigned int *)(rec->ip + 4); + pr_debug("%s: bralid 0x%x\n", __func__, bralid); +#endif /* USE_FTRACE_NOP */ + } + +#ifdef USE_FTRACE_NOP + ret = ftrace_modify_code(rec->ip, MICROBLAZE_NOP); + ret += ftrace_modify_code(rec->ip + 4, MICROBLAZE_NOP); +#else /* USE_FTRACE_NOP */ + ret = ftrace_modify_code(rec->ip, MICROBLAZE_BRI); +#endif /* USE_FTRACE_NOP */ + return ret; +} + +/* I believe that first is called ftrace_make_nop before this function */ +int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) +{ + int ret; + pr_debug("%s: addr:0x%x, rec->ip: 0x%x, imm:0x%x\n", + __func__, (unsigned int)addr, (unsigned int)rec->ip, imm); + ret = ftrace_modify_code(rec->ip, imm); +#ifdef USE_FTRACE_NOP + pr_debug("%s: bralid:0x%x\n", __func__, bralid); + ret += ftrace_modify_code(rec->ip + 4, bralid); +#endif /* USE_FTRACE_NOP */ + return ret; +} + +int __init ftrace_dyn_arch_init(void) +{ + return 0; +} + +int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + unsigned int upper = (unsigned int)func; + unsigned int lower = (unsigned int)func; + int ret = 0; + + /* create proper saving to ftrace_call poll */ + upper = 0xb0000000 + (upper >> 16); /* imm func_upper */ + lower = 0x32800000 + (lower & 0xFFFF); /* addik r20, r0, func_lower */ + + pr_debug("%s: func=0x%x, ip=0x%x, upper=0x%x, lower=0x%x\n", + __func__, (unsigned int)func, (unsigned int)ip, upper, lower); + + /* save upper and lower code */ + ret = ftrace_modify_code(ip, upper); + ret += ftrace_modify_code(ip + 4, lower); + + /* We just need to replace the rtsd r15, 8 with NOP */ + ret += ftrace_modify_code((unsigned long)&ftrace_caller, + MICROBLAZE_NOP); + + return ret; +} + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +unsigned int old_jump; /* saving place for jump instruction */ + +int ftrace_enable_ftrace_graph_caller(void) +{ + unsigned int ret; + unsigned long ip = (unsigned long)(&ftrace_call_graph); + + old_jump = *(unsigned int *)ip; /* save jump over instruction */ + ret = ftrace_modify_code(ip, MICROBLAZE_NOP); + + pr_debug("%s: Replace instruction: 0x%x\n", __func__, old_jump); + return ret; +} + +int ftrace_disable_ftrace_graph_caller(void) +{ + unsigned int ret; + unsigned long ip = (unsigned long)(&ftrace_call_graph); + + ret = ftrace_modify_code(ip, old_jump); + + pr_debug("%s\n", __func__); + return ret; +} +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ +#endif /* CONFIG_DYNAMIC_FTRACE */ diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S new file mode 100644 index 000000000..f264fdcf1 --- /dev/null +++ b/arch/microblaze/kernel/head.S @@ -0,0 +1,386 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * MMU code derived from arch/ppc/kernel/head_4xx.S: + * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> + * Initial PowerPC version. + * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> + * Rewritten for PReP + * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Low-level exception handers, MMU support, and rewrite. + * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> + * PowerPC 8xx modifications. + * Copyright (c) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright 2000 MontaVista Software Inc. + * PPC405 modifications + * PowerPC 403GCX/405GP modifications. + * Author: MontaVista Software, Inc. + * frank_rowand@mvista.com or source@mvista.com + * debbie_chu@mvista.com + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/linkage.h> +#include <asm/thread_info.h> +#include <asm/page.h> +#include <linux/of_fdt.h> /* for OF_DT_HEADER */ + +#ifdef CONFIG_MMU +#include <asm/setup.h> /* COMMAND_LINE_SIZE */ +#include <asm/mmu.h> +#include <asm/processor.h> + +.section .data +.global empty_zero_page +.align 12 +empty_zero_page: + .space PAGE_SIZE +.global swapper_pg_dir +swapper_pg_dir: + .space PAGE_SIZE + +#endif /* CONFIG_MMU */ + +.section .rodata +.align 4 +endian_check: + .word 1 + + __HEAD +ENTRY(_start) +#if CONFIG_KERNEL_BASE_ADDR == 0 + brai TOPHYS(real_start) + .org 0x100 +real_start: +#endif + + mts rmsr, r0 +/* Disable stack protection from bootloader */ + mts rslr, r0 + addi r8, r0, 0xFFFFFFFF + mts rshr, r8 +/* + * According to Xilinx, msrclr instruction behaves like 'mfs rX,rpc' + * if the msrclr instruction is not enabled. We use this to detect + * if the opcode is available, by issuing msrclr and then testing the result. + * r8 == 0 - msr instructions are implemented + * r8 != 0 - msr instructions are not implemented + */ + mfs r1, rmsr + msrclr r8, 0 /* clear nothing - just read msr for test */ + cmpu r8, r8, r1 /* r1 must contain msr reg content */ + +/* r7 may point to an FDT, or there may be one linked in. + if it's in r7, we've got to save it away ASAP. + We ensure r7 points to a valid FDT, just in case the bootloader + is broken or non-existent */ + beqi r7, no_fdt_arg /* NULL pointer? don't copy */ +/* Does r7 point to a valid FDT? Load HEADER magic number */ + /* Run time Big/Little endian platform */ + /* Save 1 as word and load byte - 0 - BIG, 1 - LITTLE */ + lbui r11, r0, TOPHYS(endian_check) + beqid r11, big_endian /* DO NOT break delay stop dependency */ + lw r11, r0, r7 /* Big endian load in delay slot */ + lwr r11, r0, r7 /* Little endian load */ +big_endian: + rsubi r11, r11, OF_DT_HEADER /* Check FDT header */ + beqi r11, _prepare_copy_fdt + or r7, r0, r0 /* clear R7 when not valid DTB */ + bnei r11, no_fdt_arg /* No - get out of here */ +_prepare_copy_fdt: + or r11, r0, r0 /* incremment */ + ori r4, r0, TOPHYS(_fdt_start) + ori r3, r0, (0x8000 - 4) +_copy_fdt: + lw r12, r7, r11 /* r12 = r7 + r11 */ + sw r12, r4, r11 /* addr[r4 + r11] = r12 */ + addik r11, r11, 4 /* increment counting */ + bgtid r3, _copy_fdt /* loop for all entries */ + addik r3, r3, -4 /* descrement loop */ +no_fdt_arg: + +#ifdef CONFIG_MMU + +#ifndef CONFIG_CMDLINE_BOOL +/* + * handling command line + * copy command line directly to cmd_line placed in data section. + */ + beqid r5, skip /* Skip if NULL pointer */ + or r11, r0, r0 /* incremment */ + ori r4, r0, cmd_line /* load address of command line */ + tophys(r4,r4) /* convert to phys address */ + ori r3, r0, COMMAND_LINE_SIZE - 1 /* number of loops */ +_copy_command_line: + /* r2=r5+r6 - r5 contain pointer to command line */ + lbu r2, r5, r11 + beqid r2, skip /* Skip if no data */ + sb r2, r4, r11 /* addr[r4+r6]= r2 */ + addik r11, r11, 1 /* increment counting */ + bgtid r3, _copy_command_line /* loop for all entries */ + addik r3, r3, -1 /* decrement loop */ + addik r5, r4, 0 /* add new space for command line */ + tovirt(r5,r5) +skip: +#endif /* CONFIG_CMDLINE_BOOL */ + +#ifdef NOT_COMPILE +/* save bram context */ + or r11, r0, r0 /* incremment */ + ori r4, r0, TOPHYS(_bram_load_start) /* save bram context */ + ori r3, r0, (LMB_SIZE - 4) +_copy_bram: + lw r7, r0, r11 /* r7 = r0 + r6 */ + sw r7, r4, r11 /* addr[r4 + r6] = r7 */ + addik r11, r11, 4 /* increment counting */ + bgtid r3, _copy_bram /* loop for all entries */ + addik r3, r3, -4 /* descrement loop */ +#endif + /* We have to turn on the MMU right away. */ + + /* + * Set up the initial MMU state so we can do the first level of + * kernel initialization. This maps the first 16 MBytes of memory 1:1 + * virtual to physical. + */ + nop + addik r3, r0, MICROBLAZE_TLB_SIZE -1 /* Invalidate all TLB entries */ +_invalidate: + mts rtlbx, r3 + mts rtlbhi, r0 /* flush: ensure V is clear */ + mts rtlblo, r0 + bgtid r3, _invalidate /* loop for all entries */ + addik r3, r3, -1 + /* sync */ + + /* Setup the kernel PID */ + mts rpid,r0 /* Load the kernel PID */ + nop + bri 4 + + /* + * We should still be executing code at physical address area + * RAM_BASEADDR at this point. However, kernel code is at + * a virtual address. So, set up a TLB mapping to cover this once + * translation is enabled. + */ + + addik r3,r0, CONFIG_KERNEL_START /* Load the kernel virtual address */ + tophys(r4,r3) /* Load the kernel physical address */ + + /* start to do TLB calculation */ + addik r12, r0, _end + rsub r12, r3, r12 + addik r12, r12, CONFIG_LOWMEM_SIZE >> PTE_SHIFT /* that's the pad */ + + or r9, r0, r0 /* TLB0 = 0 */ + or r10, r0, r0 /* TLB1 = 0 */ + + addik r11, r12, -0x1000000 + bgei r11, GT16 /* size is greater than 16MB */ + addik r11, r12, -0x0800000 + bgei r11, GT8 /* size is greater than 8MB */ + addik r11, r12, -0x0400000 + bgei r11, GT4 /* size is greater than 4MB */ + /* size is less than 4MB */ + addik r11, r12, -0x0200000 + bgei r11, GT2 /* size is greater than 2MB */ + addik r9, r0, 0x0100000 /* TLB0 must be 1MB */ + addik r11, r12, -0x0100000 + bgei r11, GT1 /* size is greater than 1MB */ + /* TLB1 is 0 which is setup above */ + bri tlb_end +GT4: /* r11 contains the rest - will be either 1 or 4 */ + ori r9, r0, 0x400000 /* TLB0 is 4MB */ + bri TLB1 +GT16: /* TLB0 is 16MB */ + addik r9, r0, 0x1000000 /* means TLB0 is 16MB */ +TLB1: + /* must be used r2 because of subtract if failed */ + addik r2, r11, -0x0400000 + bgei r2, GT20 /* size is greater than 16MB */ + /* size is >16MB and <20MB */ + addik r11, r11, -0x0100000 + bgei r11, GT17 /* size is greater than 17MB */ + /* kernel is >16MB and < 17MB */ +GT1: + addik r10, r0, 0x0100000 /* means TLB1 is 1MB */ + bri tlb_end +GT2: /* TLB0 is 0 and TLB1 will be 4MB */ +GT17: /* TLB1 is 4MB - kernel size <20MB */ + addik r10, r0, 0x0400000 /* means TLB1 is 4MB */ + bri tlb_end +GT8: /* TLB0 is still zero that's why I can use only TLB1 */ +GT20: /* TLB1 is 16MB - kernel size >20MB */ + addik r10, r0, 0x1000000 /* means TLB1 is 16MB */ +tlb_end: + + /* + * Configure and load two entries into TLB slots 0 and 1. + * In case we are pinning TLBs, these are reserved in by the + * other TLB functions. If not reserving, then it doesn't + * matter where they are loaded. + */ + andi r4,r4,0xfffffc00 /* Mask off the real page number */ + ori r4,r4,(TLB_WR | TLB_EX) /* Set the write and execute bits */ + + /* + * TLB0 is always used - check if is not zero (r9 stores TLB0 value) + * if is use TLB1 value and clear it (r10 stores TLB1 value) + */ + bnei r9, tlb0_not_zero + add r9, r10, r0 + add r10, r0, r0 +tlb0_not_zero: + + /* look at the code below */ + ori r30, r0, 0x200 + andi r29, r9, 0x100000 + bneid r29, 1f + addik r30, r30, 0x80 + andi r29, r9, 0x400000 + bneid r29, 1f + addik r30, r30, 0x80 + andi r29, r9, 0x1000000 + bneid r29, 1f + addik r30, r30, 0x80 +1: + andi r3,r3,0xfffffc00 /* Mask off the effective page number */ + ori r3,r3,(TLB_VALID) + or r3, r3, r30 + + /* Load tlb_skip size value which is index to first unused TLB entry */ + lwi r11, r0, TOPHYS(tlb_skip) + mts rtlbx,r11 /* TLB slow 0 */ + + mts rtlblo,r4 /* Load the data portion of the entry */ + mts rtlbhi,r3 /* Load the tag portion of the entry */ + + /* Increase tlb_skip size */ + addik r11, r11, 1 + swi r11, r0, TOPHYS(tlb_skip) + + /* TLB1 can be zeroes that's why we not setup it */ + beqi r10, jump_over2 + + /* look at the code below */ + ori r30, r0, 0x200 + andi r29, r10, 0x100000 + bneid r29, 1f + addik r30, r30, 0x80 + andi r29, r10, 0x400000 + bneid r29, 1f + addik r30, r30, 0x80 + andi r29, r10, 0x1000000 + bneid r29, 1f + addik r30, r30, 0x80 +1: + addk r4, r4, r9 /* previous addr + TLB0 size */ + addk r3, r3, r9 + + andi r3,r3,0xfffffc00 /* Mask off the effective page number */ + ori r3,r3,(TLB_VALID) + or r3, r3, r30 + + lwi r11, r0, TOPHYS(tlb_skip) + mts rtlbx, r11 /* r11 is used from TLB0 */ + + mts rtlblo,r4 /* Load the data portion of the entry */ + mts rtlbhi,r3 /* Load the tag portion of the entry */ + + /* Increase tlb_skip size */ + addik r11, r11, 1 + swi r11, r0, TOPHYS(tlb_skip) + +jump_over2: + /* + * Load a TLB entry for LMB, since we need access to + * the exception vectors, using a 4k real==virtual mapping. + */ + /* Use temporary TLB_ID for LMB - clear this temporary mapping later */ + ori r11, r0, MICROBLAZE_LMB_TLB_ID + mts rtlbx,r11 + + ori r4,r0,(TLB_WR | TLB_EX) + ori r3,r0,(TLB_VALID | TLB_PAGESZ(PAGESZ_4K)) + + mts rtlblo,r4 /* Load the data portion of the entry */ + mts rtlbhi,r3 /* Load the tag portion of the entry */ + + /* + * We now have the lower 16 Meg of RAM mapped into TLB entries, and the + * caches ready to work. + */ +turn_on_mmu: + ori r15,r0,start_here + ori r4,r0,MSR_KERNEL_VMS + mts rmsr,r4 + nop + rted r15,0 /* enables MMU */ + nop + +start_here: +#endif /* CONFIG_MMU */ + + /* Initialize small data anchors */ + addik r13, r0, _KERNEL_SDA_BASE_ + addik r2, r0, _KERNEL_SDA2_BASE_ + + /* Initialize stack pointer */ + addik r1, r0, init_thread_union + THREAD_SIZE - 4 + + /* Initialize r31 with current task address */ + addik r31, r0, init_task + + addik r11, r0, machine_early_init + brald r15, r11 + nop + +#ifndef CONFIG_MMU + addik r15, r0, machine_halt + braid start_kernel + nop +#else + /* + * Initialize the MMU. + */ + bralid r15, mmu_init + nop + + /* Go back to running unmapped so we can load up new values + * and change to using our exception vectors. + * On the MicroBlaze, all we invalidate the used TLB entries to clear + * the old 16M byte TLB mappings. + */ + ori r15,r0,TOPHYS(kernel_load_context) + ori r4,r0,MSR_KERNEL + mts rmsr,r4 + nop + bri 4 + rted r15,0 + nop + + /* Load up the kernel context */ +kernel_load_context: + ori r5, r0, MICROBLAZE_LMB_TLB_ID + mts rtlbx,r5 + nop + mts rtlbhi,r0 + nop + addi r15, r0, machine_halt + ori r17, r0, start_kernel + ori r4, r0, MSR_KERNEL_VMS + mts rmsr, r4 + nop + rted r17, 0 /* enable MMU and jump to start_kernel */ + nop +#endif /* CONFIG_MMU */ diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S new file mode 100644 index 000000000..0b11a4469 --- /dev/null +++ b/arch/microblaze/kernel/hw_exception_handler.S @@ -0,0 +1,1225 @@ +/* + * Exception handling for Microblaze + * + * Rewriten interrupt handling + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * + * uClinux customisation (C) 2005 John Williams + * + * MMU code derived from arch/ppc/kernel/head_4xx.S: + * Copyright (C) 1995-1996 Gary Thomas <gdt@linuxppc.org> + * Initial PowerPC version. + * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> + * Rewritten for PReP + * Copyright (C) 1996 Paul Mackerras <paulus@cs.anu.edu.au> + * Low-level exception handers, MMU support, and rewrite. + * Copyright (C) 1997 Dan Malek <dmalek@jlc.net> + * PowerPC 8xx modifications. + * Copyright (C) 1998-1999 TiVo, Inc. + * PowerPC 403GCX modifications. + * Copyright (C) 1999 Grant Erickson <grant@lcse.umn.edu> + * PowerPC 403GCX/405GP modifications. + * Copyright 2000 MontaVista Software Inc. + * PPC405 modifications + * PowerPC 403GCX/405GP modifications. + * Author: MontaVista Software, Inc. + * frank_rowand@mvista.com or source@mvista.com + * debbie_chu@mvista.com + * + * Original code + * Copyright (C) 2004 Xilinx, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +/* + * Here are the handlers which don't require enabling translation + * and calling other kernel code thus we can keep their design very simple + * and do all processing in real mode. All what they need is a valid current + * (that is an issue for the CONFIG_REGISTER_TASK_PTR case) + * This handlers use r3,r4,r5,r6 and optionally r[current] to work therefore + * these registers are saved/restored + * The handlers which require translation are in entry.S --KAA + * + * Microblaze HW Exception Handler + * - Non self-modifying exception handler for the following exception conditions + * - Unalignment + * - Instruction bus error + * - Data bus error + * - Illegal instruction opcode + * - Divide-by-zero + * + * - Privileged instruction exception (MMU) + * - Data storage exception (MMU) + * - Instruction storage exception (MMU) + * - Data TLB miss exception (MMU) + * - Instruction TLB miss exception (MMU) + * + * Note we disable interrupts during exception handling, otherwise we will + * possibly get multiple re-entrancy if interrupt handles themselves cause + * exceptions. JW + */ + +#include <asm/exceptions.h> +#include <asm/unistd.h> +#include <asm/page.h> + +#include <asm/entry.h> +#include <asm/current.h> +#include <linux/linkage.h> + +#include <asm/mmu.h> +#include <asm/pgtable.h> +#include <asm/signal.h> +#include <asm/registers.h> +#include <asm/asm-offsets.h> + +#undef DEBUG + +/* Helpful Macros */ +#define NUM_TO_REG(num) r ## num + +#ifdef CONFIG_MMU + #define RESTORE_STATE \ + lwi r5, r1, 0; \ + mts rmsr, r5; \ + nop; \ + lwi r3, r1, PT_R3; \ + lwi r4, r1, PT_R4; \ + lwi r5, r1, PT_R5; \ + lwi r6, r1, PT_R6; \ + lwi r11, r1, PT_R11; \ + lwi r31, r1, PT_R31; \ + lwi r1, r1, PT_R1; +#endif /* CONFIG_MMU */ + +#define LWREG_NOP \ + bri ex_handler_unhandled; \ + nop; + +#define SWREG_NOP \ + bri ex_handler_unhandled; \ + nop; + +/* FIXME this is weird - for noMMU kernel is not possible to use brid + * instruction which can shorten executed time + */ + +/* r3 is the source */ +#define R3_TO_LWREG_V(regnum) \ + swi r3, r1, 4 * regnum; \ + bri ex_handler_done; + +/* r3 is the source */ +#define R3_TO_LWREG(regnum) \ + or NUM_TO_REG (regnum), r0, r3; \ + bri ex_handler_done; + +/* r3 is the target */ +#define SWREG_TO_R3_V(regnum) \ + lwi r3, r1, 4 * regnum; \ + bri ex_sw_tail; + +/* r3 is the target */ +#define SWREG_TO_R3(regnum) \ + or r3, r0, NUM_TO_REG (regnum); \ + bri ex_sw_tail; + +#ifdef CONFIG_MMU + #define R3_TO_LWREG_VM_V(regnum) \ + brid ex_lw_end_vm; \ + swi r3, r7, 4 * regnum; + + #define R3_TO_LWREG_VM(regnum) \ + brid ex_lw_end_vm; \ + or NUM_TO_REG (regnum), r0, r3; + + #define SWREG_TO_R3_VM_V(regnum) \ + brid ex_sw_tail_vm; \ + lwi r3, r7, 4 * regnum; + + #define SWREG_TO_R3_VM(regnum) \ + brid ex_sw_tail_vm; \ + or r3, r0, NUM_TO_REG (regnum); + + /* Shift right instruction depending on available configuration */ + #if CONFIG_XILINX_MICROBLAZE0_USE_BARREL == 0 + /* Only the used shift constants defined here - add more if needed */ + #define BSRLI2(rD, rA) \ + srl rD, rA; /* << 1 */ \ + srl rD, rD; /* << 2 */ + #define BSRLI4(rD, rA) \ + BSRLI2(rD, rA); \ + BSRLI2(rD, rD) + #define BSRLI10(rD, rA) \ + srl rD, rA; /* << 1 */ \ + srl rD, rD; /* << 2 */ \ + srl rD, rD; /* << 3 */ \ + srl rD, rD; /* << 4 */ \ + srl rD, rD; /* << 5 */ \ + srl rD, rD; /* << 6 */ \ + srl rD, rD; /* << 7 */ \ + srl rD, rD; /* << 8 */ \ + srl rD, rD; /* << 9 */ \ + srl rD, rD /* << 10 */ + #define BSRLI20(rD, rA) \ + BSRLI10(rD, rA); \ + BSRLI10(rD, rD) + + .macro bsrli, rD, rA, IMM + .if (\IMM) == 2 + BSRLI2(\rD, \rA) + .elseif (\IMM) == 10 + BSRLI10(\rD, \rA) + .elseif (\IMM) == 12 + BSRLI2(\rD, \rA) + BSRLI10(\rD, \rD) + .elseif (\IMM) == 14 + BSRLI4(\rD, \rA) + BSRLI10(\rD, \rD) + .elseif (\IMM) == 20 + BSRLI20(\rD, \rA) + .elseif (\IMM) == 24 + BSRLI4(\rD, \rA) + BSRLI20(\rD, \rD) + .elseif (\IMM) == 28 + BSRLI4(\rD, \rA) + BSRLI4(\rD, \rD) + BSRLI20(\rD, \rD) + .else + .error "BSRLI shift macros \IMM" + .endif + .endm + #endif + +#endif /* CONFIG_MMU */ + +.extern other_exception_handler /* Defined in exception.c */ + +/* + * hw_exception_handler - Handler for exceptions + * + * Exception handler notes: + * - Handles all exceptions + * - Does not handle unaligned exceptions during load into r17, r1, r0. + * - Does not handle unaligned exceptions during store from r17 (cannot be + * done) and r1 (slows down common case) + * + * Relevant register structures + * + * EAR - |----|----|----|----|----|----|----|----| + * - < ## 32 bit faulting address ## > + * + * ESR - |----|----|----|----|----| - | - |-----|-----| + * - W S REG EXC + * + * + * STACK FRAME STRUCTURE (for CONFIG_MMU=n) + * ---------------------------------------- + * + * +-------------+ + 0 + * | MSR | + * +-------------+ + 4 + * | r1 | + * | . | + * | . | + * | . | + * | . | + * | r18 | + * +-------------+ + 76 + * | . | + * | . | + * + * MMU kernel uses the same 'pt_pool_space' pointed space + * which is used for storing register values - noMMu style was, that values were + * stored in stack but in case of failure you lost information about register. + * Currently you can see register value in memory in specific place. + * In compare to with previous solution the speed should be the same. + * + * MMU exception handler has different handling compare to no MMU kernel. + * Exception handler use jump table for directing of what happen. For MMU kernel + * is this approach better because MMU relate exception are handled by asm code + * in this file. In compare to with MMU expect of unaligned exception + * is everything handled by C code. + */ + +/* + * every of these handlers is entered having R3/4/5/6/11/current saved on stack + * and clobbered so care should be taken to restore them if someone is going to + * return from exception + */ + +/* wrappers to restore state before coming to entry.S */ +#ifdef CONFIG_MMU +.section .data +.align 4 +pt_pool_space: + .space PT_SIZE + +#ifdef DEBUG +/* Create space for exception counting. */ +.section .data +.global exception_debug_table +.align 4 +exception_debug_table: + /* Look at exception vector table. There is 32 exceptions * word size */ + .space (32 * 4) +#endif /* DEBUG */ + +.section .rodata +.align 4 +_MB_HW_ExceptionVectorTable: +/* 0 - Undefined */ + .long TOPHYS(ex_handler_unhandled) +/* 1 - Unaligned data access exception */ + .long TOPHYS(handle_unaligned_ex) +/* 2 - Illegal op-code exception */ + .long TOPHYS(full_exception_trapw) +/* 3 - Instruction bus error exception */ + .long TOPHYS(full_exception_trapw) +/* 4 - Data bus error exception */ + .long TOPHYS(full_exception_trapw) +/* 5 - Divide by zero exception */ + .long TOPHYS(full_exception_trapw) +/* 6 - Floating point unit exception */ + .long TOPHYS(full_exception_trapw) +/* 7 - Privileged instruction exception */ + .long TOPHYS(full_exception_trapw) +/* 8 - 15 - Undefined */ + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) +/* 16 - Data storage exception */ + .long TOPHYS(handle_data_storage_exception) +/* 17 - Instruction storage exception */ + .long TOPHYS(handle_instruction_storage_exception) +/* 18 - Data TLB miss exception */ + .long TOPHYS(handle_data_tlb_miss_exception) +/* 19 - Instruction TLB miss exception */ + .long TOPHYS(handle_instruction_tlb_miss_exception) +/* 20 - 31 - Undefined */ + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) + .long TOPHYS(ex_handler_unhandled) +#endif + +.global _hw_exception_handler +.section .text +.align 4 +.ent _hw_exception_handler +_hw_exception_handler: +#ifndef CONFIG_MMU + addik r1, r1, -(EX_HANDLER_STACK_SIZ); /* Create stack frame */ +#else + swi r1, r0, TOPHYS(pt_pool_space + PT_R1); /* GET_SP */ + /* Save date to kernel memory. Here is the problem + * when you came from user space */ + ori r1, r0, TOPHYS(pt_pool_space); +#endif + swi r3, r1, PT_R3 + swi r4, r1, PT_R4 + swi r5, r1, PT_R5 + swi r6, r1, PT_R6 + +#ifdef CONFIG_MMU + swi r11, r1, PT_R11 + swi r31, r1, PT_R31 + lwi r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */ +#endif + + mfs r5, rmsr; + nop + swi r5, r1, 0; + mfs r4, resr + nop + mfs r3, rear; + nop + +#ifndef CONFIG_MMU + andi r5, r4, 0x1000; /* Check ESR[DS] */ + beqi r5, not_in_delay_slot; /* Branch if ESR[DS] not set */ + mfs r17, rbtr; /* ESR[DS] set - return address in BTR */ + nop +not_in_delay_slot: + swi r17, r1, PT_R17 +#endif + + andi r5, r4, 0x1F; /* Extract ESR[EXC] */ + +#ifdef CONFIG_MMU + /* Calculate exception vector offset = r5 << 2 */ + addk r6, r5, r5; /* << 1 */ + addk r6, r6, r6; /* << 2 */ + +#ifdef DEBUG +/* counting which exception happen */ + lwi r5, r0, TOPHYS(exception_debug_table) + addi r5, r5, 1 + swi r5, r0, TOPHYS(exception_debug_table) + lwi r5, r6, TOPHYS(exception_debug_table) + addi r5, r5, 1 + swi r5, r6, TOPHYS(exception_debug_table) +#endif +/* end */ + /* Load the HW Exception vector */ + lwi r6, r6, TOPHYS(_MB_HW_ExceptionVectorTable) + bra r6 + +full_exception_trapw: + RESTORE_STATE + bri full_exception_trap +#else + /* Exceptions enabled here. This will allow nested exceptions */ + mfs r6, rmsr; + nop + swi r6, r1, 0; /* RMSR_OFFSET */ + ori r6, r6, 0x100; /* Turn ON the EE bit */ + andi r6, r6, ~2; /* Disable interrupts */ + mts rmsr, r6; + nop + + xori r6, r5, 1; /* 00001 = Unaligned Exception */ + /* Jump to unalignment exception handler */ + beqi r6, handle_unaligned_ex; + +handle_other_ex: /* Handle Other exceptions here */ + /* Save other volatiles before we make procedure calls below */ + swi r7, r1, PT_R7 + swi r8, r1, PT_R8 + swi r9, r1, PT_R9 + swi r10, r1, PT_R10 + swi r11, r1, PT_R11 + swi r12, r1, PT_R12 + swi r14, r1, PT_R14 + swi r15, r1, PT_R15 + swi r18, r1, PT_R18 + + or r5, r1, r0 + andi r6, r4, 0x1F; /* Load ESR[EC] */ + lwi r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */ + swi r7, r1, PT_MODE + mfs r7, rfsr + nop + addk r8, r17, r0; /* Load exception address */ + bralid r15, full_exception; /* Branch to the handler */ + nop; + mts rfsr, r0; /* Clear sticky fsr */ + nop + + /* + * Trigger execution of the signal handler by enabling + * interrupts and calling an invalid syscall. + */ + mfs r5, rmsr; + nop + ori r5, r5, 2; + mts rmsr, r5; /* enable interrupt */ + nop + addi r12, r0, __NR_syscalls; + brki r14, 0x08; + mfs r5, rmsr; /* disable interrupt */ + nop + andi r5, r5, ~2; + mts rmsr, r5; + nop + + lwi r7, r1, PT_R7 + lwi r8, r1, PT_R8 + lwi r9, r1, PT_R9 + lwi r10, r1, PT_R10 + lwi r11, r1, PT_R11 + lwi r12, r1, PT_R12 + lwi r14, r1, PT_R14 + lwi r15, r1, PT_R15 + lwi r18, r1, PT_R18 + + bri ex_handler_done; /* Complete exception handling */ +#endif + +/* 0x01 - Unaligned data access exception + * This occurs when a word access is not aligned on a word boundary, + * or when a 16-bit access is not aligned on a 16-bit boundary. + * This handler perform the access, and returns, except for MMU when + * the unaligned address is last on a 4k page or the physical address is + * not found in the page table, in which case unaligned_data_trap is called. + */ +handle_unaligned_ex: + /* Working registers already saved: R3, R4, R5, R6 + * R4 = ESR + * R3 = EAR + */ +#ifdef CONFIG_MMU + andi r6, r4, 0x1000 /* Check ESR[DS] */ + beqi r6, _no_delayslot /* Branch if ESR[DS] not set */ + mfs r17, rbtr; /* ESR[DS] set - return address in BTR */ + nop +_no_delayslot: + /* jump to high level unaligned handler */ + RESTORE_STATE; + bri unaligned_data_trap +#endif + andi r6, r4, 0x3E0; /* Mask and extract the register operand */ + srl r6, r6; /* r6 >> 5 */ + srl r6, r6; + srl r6, r6; + srl r6, r6; + srl r6, r6; + /* Store the register operand in a temporary location */ + sbi r6, r0, TOPHYS(ex_reg_op); + + andi r6, r4, 0x400; /* Extract ESR[S] */ + bnei r6, ex_sw; +ex_lw: + andi r6, r4, 0x800; /* Extract ESR[W] */ + beqi r6, ex_lhw; + lbui r5, r3, 0; /* Exception address in r3 */ + /* Load a word, byte-by-byte from destination address + and save it in tmp space */ + sbi r5, r0, TOPHYS(ex_tmp_data_loc_0); + lbui r5, r3, 1; + sbi r5, r0, TOPHYS(ex_tmp_data_loc_1); + lbui r5, r3, 2; + sbi r5, r0, TOPHYS(ex_tmp_data_loc_2); + lbui r5, r3, 3; + sbi r5, r0, TOPHYS(ex_tmp_data_loc_3); + /* Get the destination register value into r4 */ + lwi r4, r0, TOPHYS(ex_tmp_data_loc_0); + bri ex_lw_tail; +ex_lhw: + lbui r5, r3, 0; /* Exception address in r3 */ + /* Load a half-word, byte-by-byte from destination + address and save it in tmp space */ + sbi r5, r0, TOPHYS(ex_tmp_data_loc_0); + lbui r5, r3, 1; + sbi r5, r0, TOPHYS(ex_tmp_data_loc_1); + /* Get the destination register value into r4 */ + lhui r4, r0, TOPHYS(ex_tmp_data_loc_0); +ex_lw_tail: + /* Get the destination register number into r5 */ + lbui r5, r0, TOPHYS(ex_reg_op); + /* Form load_word jump table offset (lw_table + (8 * regnum)) */ + addik r6, r0, TOPHYS(lw_table); + addk r5, r5, r5; + addk r5, r5, r5; + addk r5, r5, r5; + addk r5, r5, r6; + bra r5; +ex_lw_end: /* Exception handling of load word, ends */ +ex_sw: + /* Get the destination register number into r5 */ + lbui r5, r0, TOPHYS(ex_reg_op); + /* Form store_word jump table offset (sw_table + (8 * regnum)) */ + addik r6, r0, TOPHYS(sw_table); + add r5, r5, r5; + add r5, r5, r5; + add r5, r5, r5; + add r5, r5, r6; + bra r5; +ex_sw_tail: + mfs r6, resr; + nop + andi r6, r6, 0x800; /* Extract ESR[W] */ + beqi r6, ex_shw; + /* Get the word - delay slot */ + swi r4, r0, TOPHYS(ex_tmp_data_loc_0); + /* Store the word, byte-by-byte into destination address */ + lbui r4, r0, TOPHYS(ex_tmp_data_loc_0); + sbi r4, r3, 0; + lbui r4, r0, TOPHYS(ex_tmp_data_loc_1); + sbi r4, r3, 1; + lbui r4, r0, TOPHYS(ex_tmp_data_loc_2); + sbi r4, r3, 2; + lbui r4, r0, TOPHYS(ex_tmp_data_loc_3); + sbi r4, r3, 3; + bri ex_handler_done; + +ex_shw: + /* Store the lower half-word, byte-by-byte into destination address */ + swi r4, r0, TOPHYS(ex_tmp_data_loc_0); + lbui r4, r0, TOPHYS(ex_tmp_data_loc_2); + sbi r4, r3, 0; + lbui r4, r0, TOPHYS(ex_tmp_data_loc_3); + sbi r4, r3, 1; +ex_sw_end: /* Exception handling of store word, ends. */ + +ex_handler_done: +#ifndef CONFIG_MMU + lwi r5, r1, 0 /* RMSR */ + mts rmsr, r5 + nop + lwi r3, r1, PT_R3 + lwi r4, r1, PT_R4 + lwi r5, r1, PT_R5 + lwi r6, r1, PT_R6 + lwi r17, r1, PT_R17 + + rted r17, 0 + addik r1, r1, (EX_HANDLER_STACK_SIZ); /* Restore stack frame */ +#else + RESTORE_STATE; + rted r17, 0 + nop +#endif + +#ifdef CONFIG_MMU + /* Exception vector entry code. This code runs with address translation + * turned off (i.e. using physical addresses). */ + + /* Exception vectors. */ + + /* 0x10 - Data Storage Exception + * This happens for just a few reasons. U0 set (but we don't do that), + * or zone protection fault (user violation, write to protected page). + * If this is just an update of modified status, we do that quickly + * and exit. Otherwise, we call heavyweight functions to do the work. + */ + handle_data_storage_exception: + /* Working registers already saved: R3, R4, R5, R6 + * R3 = ESR + */ + mfs r11, rpid + nop + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + ori r5, r0, CONFIG_KERNEL_START + cmpu r5, r3, r5 + bgti r5, ex3 + /* First, check if it was a zone fault (which means a user + * tried to access a kernel or read-protected page - always + * a SEGV). All other faults here must be stores, so no + * need to check ESR_S as well. */ + andi r4, r4, ESR_DIZ /* ESR_Z - zone protection */ + bnei r4, ex2 + + ori r4, r0, swapper_pg_dir + mts rpid, r0 /* TLB will have 0 TID */ + nop + bri ex4 + + /* Get the PGD for the current thread. */ + ex3: + /* First, check if it was a zone fault (which means a user + * tried to access a kernel or read-protected page - always + * a SEGV). All other faults here must be stores, so no + * need to check ESR_S as well. */ + andi r4, r4, ESR_DIZ /* ESR_Z */ + bnei r4, ex2 + /* get current task address */ + addi r4 ,CURRENT_TASK, TOPHYS(0); + lwi r4, r4, TASK_THREAD+PGDIR + ex4: + tophys(r4,r4) + /* Create L1 (pgdir/pmd) address */ + bsrli r5, r3, PGDIR_SHIFT - 2 + andi r5, r5, PAGE_SIZE - 4 +/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ + or r4, r4, r5 + lwi r4, r4, 0 /* Get L1 entry */ + andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ + beqi r5, ex2 /* Bail if no table */ + + tophys(r5,r5) + bsrli r6, r3, PTE_SHIFT /* Compute PTE address */ + andi r6, r6, PAGE_SIZE - 4 + or r5, r5, r6 + lwi r4, r5, 0 /* Get Linux PTE */ + + andi r6, r4, _PAGE_RW /* Is it writeable? */ + beqi r6, ex2 /* Bail if not */ + + /* Update 'changed' */ + ori r4, r4, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE + swi r4, r5, 0 /* Update Linux page table */ + + /* Most of the Linux PTE is ready to load into the TLB LO. + * We set ZSEL, where only the LS-bit determines user access. + * We set execute, because we don't have the granularity to + * properly set this at the page level (Linux problem). + * If shared is set, we cause a zero PID->TID load. + * Many of these bits are software only. Bits we don't set + * here we (properly should) assume have the appropriate value. + */ +/* Ignore memory coherent, just LSB on ZSEL is used + EX/WR */ + andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ + TLB_ZSEL(1) | TLB_ATTR_MASK + ori r4, r4, _PAGE_HWEXEC /* make it executable */ + + /* find the TLB index that caused the fault. It has to be here*/ + mts rtlbsx, r3 + nop + mfs r5, rtlbx /* DEBUG: TBD */ + nop + mts rtlblo, r4 /* Load TLB LO */ + nop + /* Will sync shadow TLBs */ + + /* Done...restore registers and get out of here. */ + mts rpid, r11 + nop + bri 4 + + RESTORE_STATE; + rted r17, 0 + nop + ex2: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. */ + mts rpid, r11 + nop + bri 4 + RESTORE_STATE; + bri page_fault_data_trap + + + /* 0x11 - Instruction Storage Exception + * This is caused by a fetch from non-execute or guarded pages. */ + handle_instruction_storage_exception: + /* Working registers already saved: R3, R4, R5, R6 + * R3 = ESR + */ + + RESTORE_STATE; + bri page_fault_instr_trap + + /* 0x12 - Data TLB Miss Exception + * As the name implies, translation is not in the MMU, so search the + * page tables and fix it. The only purpose of this function is to + * load TLB entries from the page table if they exist. + */ + handle_data_tlb_miss_exception: + /* Working registers already saved: R3, R4, R5, R6 + * R3 = EAR, R4 = ESR + */ + mfs r11, rpid + nop + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. */ + ori r6, r0, CONFIG_KERNEL_START + cmpu r4, r3, r6 + bgti r4, ex5 + ori r4, r0, swapper_pg_dir + mts rpid, r0 /* TLB will have 0 TID */ + nop + bri ex6 + + /* Get the PGD for the current thread. */ + ex5: + /* get current task address */ + addi r4 ,CURRENT_TASK, TOPHYS(0); + lwi r4, r4, TASK_THREAD+PGDIR + ex6: + tophys(r4,r4) + /* Create L1 (pgdir/pmd) address */ + bsrli r5, r3, PGDIR_SHIFT - 2 + andi r5, r5, PAGE_SIZE - 4 +/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ + or r4, r4, r5 + lwi r4, r4, 0 /* Get L1 entry */ + andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ + beqi r5, ex7 /* Bail if no table */ + + tophys(r5,r5) + bsrli r6, r3, PTE_SHIFT /* Compute PTE address */ + andi r6, r6, PAGE_SIZE - 4 + or r5, r5, r6 + lwi r4, r5, 0 /* Get Linux PTE */ + + andi r6, r4, _PAGE_PRESENT + beqi r6, ex7 + + ori r4, r4, _PAGE_ACCESSED + swi r4, r5, 0 + + /* Most of the Linux PTE is ready to load into the TLB LO. + * We set ZSEL, where only the LS-bit determines user access. + * We set execute, because we don't have the granularity to + * properly set this at the page level (Linux problem). + * If shared is set, we cause a zero PID->TID load. + * Many of these bits are software only. Bits we don't set + * here we (properly should) assume have the appropriate value. + */ + brid finish_tlb_load + andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ + TLB_ZSEL(1) | TLB_ATTR_MASK + ex7: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mts rpid, r11 + nop + bri 4 + RESTORE_STATE; + bri page_fault_data_trap + + /* 0x13 - Instruction TLB Miss Exception + * Nearly the same as above, except we get our information from + * different registers and bailout to a different point. + */ + handle_instruction_tlb_miss_exception: + /* Working registers already saved: R3, R4, R5, R6 + * R3 = ESR + */ + mfs r11, rpid + nop + + /* If we are faulting a kernel address, we have to use the + * kernel page tables. + */ + ori r4, r0, CONFIG_KERNEL_START + cmpu r4, r3, r4 + bgti r4, ex8 + ori r4, r0, swapper_pg_dir + mts rpid, r0 /* TLB will have 0 TID */ + nop + bri ex9 + + /* Get the PGD for the current thread. */ + ex8: + /* get current task address */ + addi r4 ,CURRENT_TASK, TOPHYS(0); + lwi r4, r4, TASK_THREAD+PGDIR + ex9: + tophys(r4,r4) + /* Create L1 (pgdir/pmd) address */ + bsrli r5, r3, PGDIR_SHIFT - 2 + andi r5, r5, PAGE_SIZE - 4 +/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ + or r4, r4, r5 + lwi r4, r4, 0 /* Get L1 entry */ + andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ + beqi r5, ex10 /* Bail if no table */ + + tophys(r5,r5) + bsrli r6, r3, PTE_SHIFT /* Compute PTE address */ + andi r6, r6, PAGE_SIZE - 4 + or r5, r5, r6 + lwi r4, r5, 0 /* Get Linux PTE */ + + andi r6, r4, _PAGE_PRESENT + beqi r6, ex10 + + ori r4, r4, _PAGE_ACCESSED + swi r4, r5, 0 + + /* Most of the Linux PTE is ready to load into the TLB LO. + * We set ZSEL, where only the LS-bit determines user access. + * We set execute, because we don't have the granularity to + * properly set this at the page level (Linux problem). + * If shared is set, we cause a zero PID->TID load. + * Many of these bits are software only. Bits we don't set + * here we (properly should) assume have the appropriate value. + */ + brid finish_tlb_load + andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ + TLB_ZSEL(1) | TLB_ATTR_MASK + ex10: + /* The bailout. Restore registers to pre-exception conditions + * and call the heavyweights to help us out. + */ + mts rpid, r11 + nop + bri 4 + RESTORE_STATE; + bri page_fault_instr_trap + +/* Both the instruction and data TLB miss get to this point to load the TLB. + * r3 - EA of fault + * r4 - TLB LO (info from Linux PTE) + * r5, r6 - available to use + * PID - loaded with proper value when we get here + * Upon exit, we reload everything and RFI. + * A common place to load the TLB. + */ +.section .data +.align 4 +.global tlb_skip + tlb_skip: + .long MICROBLAZE_TLB_SKIP + tlb_index: + /* MS: storing last used tlb index */ + .long MICROBLAZE_TLB_SIZE/2 +.previous + finish_tlb_load: + /* MS: load the last used TLB index. */ + lwi r5, r0, TOPHYS(tlb_index) + addik r5, r5, 1 /* MS: inc tlb_index -> use next one */ + +/* MS: FIXME this is potential fault, because this is mask not count */ + andi r5, r5, MICROBLAZE_TLB_SIZE - 1 + ori r6, r0, 1 + cmp r31, r5, r6 + blti r31, ex12 + lwi r5, r0, TOPHYS(tlb_skip) + ex12: + /* MS: save back current TLB index */ + swi r5, r0, TOPHYS(tlb_index) + + ori r4, r4, _PAGE_HWEXEC /* make it executable */ + mts rtlbx, r5 /* MS: save current TLB */ + nop + mts rtlblo, r4 /* MS: save to TLB LO */ + nop + + /* Create EPN. This is the faulting address plus a static + * set of bits. These are size, valid, E, U0, and ensure + * bits 20 and 21 are zero. + */ + andi r3, r3, PAGE_MASK +#ifdef CONFIG_MICROBLAZE_64K_PAGES + ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_64K) +#elif CONFIG_MICROBLAZE_16K_PAGES + ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_16K) +#else + ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_4K) +#endif + mts rtlbhi, r3 /* Load TLB HI */ + nop + + /* Done...restore registers and get out of here. */ + mts rpid, r11 + nop + bri 4 + RESTORE_STATE; + rted r17, 0 + nop + + /* extern void giveup_fpu(struct task_struct *prev) + * + * The MicroBlaze processor may have an FPU, so this should not just + * return: TBD. + */ + .globl giveup_fpu; + .align 4; + giveup_fpu: + bralid r15,0 /* TBD */ + nop + + /* At present, this routine just hangs. - extern void abort(void) */ + .globl abort; + .align 4; + abort: + br r0 + + .globl set_context; + .align 4; + set_context: + mts rpid, r5 /* Shadow TLBs are automatically */ + nop + bri 4 /* flushed by changing PID */ + rtsd r15,8 + nop + +#endif +.end _hw_exception_handler + +#ifdef CONFIG_MMU +/* Unaligned data access exception last on a 4k page for MMU. + * When this is called, we are in virtual mode with exceptions enabled + * and registers 1-13,15,17,18 saved. + * + * R3 = ESR + * R4 = EAR + * R7 = pointer to saved registers (struct pt_regs *regs) + * + * This handler perform the access, and returns via ret_from_exc. + */ +.global _unaligned_data_exception +.ent _unaligned_data_exception +_unaligned_data_exception: + andi r8, r3, 0x3E0; /* Mask and extract the register operand */ + bsrli r8, r8, 2; /* r8 >> 2 = register operand * 8 */ + andi r6, r3, 0x400; /* Extract ESR[S] */ + bneid r6, ex_sw_vm; + andi r6, r3, 0x800; /* Extract ESR[W] - delay slot */ +ex_lw_vm: + beqid r6, ex_lhw_vm; +load1: lbui r5, r4, 0; /* Exception address in r4 - delay slot */ +/* Load a word, byte-by-byte from destination address and save it in tmp space*/ + addik r6, r0, ex_tmp_data_loc_0; + sbi r5, r6, 0; +load2: lbui r5, r4, 1; + sbi r5, r6, 1; +load3: lbui r5, r4, 2; + sbi r5, r6, 2; +load4: lbui r5, r4, 3; + sbi r5, r6, 3; + brid ex_lw_tail_vm; +/* Get the destination register value into r3 - delay slot */ + lwi r3, r6, 0; +ex_lhw_vm: + /* Load a half-word, byte-by-byte from destination address and + * save it in tmp space */ + addik r6, r0, ex_tmp_data_loc_0; + sbi r5, r6, 0; +load5: lbui r5, r4, 1; + sbi r5, r6, 1; + lhui r3, r6, 0; /* Get the destination register value into r3 */ +ex_lw_tail_vm: + /* Form load_word jump table offset (lw_table_vm + (8 * regnum)) */ + addik r5, r8, lw_table_vm; + bra r5; +ex_lw_end_vm: /* Exception handling of load word, ends */ + brai ret_from_exc; +ex_sw_vm: +/* Form store_word jump table offset (sw_table_vm + (8 * regnum)) */ + addik r5, r8, sw_table_vm; + bra r5; +ex_sw_tail_vm: + addik r5, r0, ex_tmp_data_loc_0; + beqid r6, ex_shw_vm; + swi r3, r5, 0; /* Get the word - delay slot */ + /* Store the word, byte-by-byte into destination address */ + lbui r3, r5, 0; +store1: sbi r3, r4, 0; + lbui r3, r5, 1; +store2: sbi r3, r4, 1; + lbui r3, r5, 2; +store3: sbi r3, r4, 2; + lbui r3, r5, 3; + brid ret_from_exc; +store4: sbi r3, r4, 3; /* Delay slot */ +ex_shw_vm: + /* Store the lower half-word, byte-by-byte into destination address */ +#ifdef __MICROBLAZEEL__ + lbui r3, r5, 0; +store5: sbi r3, r4, 0; + lbui r3, r5, 1; + brid ret_from_exc; +store6: sbi r3, r4, 1; /* Delay slot */ +#else + lbui r3, r5, 2; +store5: sbi r3, r4, 0; + lbui r3, r5, 3; + brid ret_from_exc; +store6: sbi r3, r4, 1; /* Delay slot */ +#endif + +ex_sw_end_vm: /* Exception handling of store word, ends. */ + +/* We have to prevent cases that get/put_user macros get unaligned pointer + * to bad page area. We have to find out which origin instruction caused it + * and called fixup for that origin instruction not instruction in unaligned + * handler */ +ex_unaligned_fixup: + ori r5, r7, 0 /* setup pointer to pt_regs */ + lwi r6, r7, PT_PC; /* faulting address is one instruction above */ + addik r6, r6, -4 /* for finding proper fixup */ + swi r6, r7, PT_PC; /* a save back it to PT_PC */ + addik r7, r0, SIGSEGV + /* call bad_page_fault for finding aligned fixup, fixup address is saved + * in PT_PC which is used as return address from exception */ + addik r15, r0, ret_from_exc-8 /* setup return address */ + brid bad_page_fault + nop + +/* We prevent all load/store because it could failed any attempt to access */ +.section __ex_table,"a"; + .word load1,ex_unaligned_fixup; + .word load2,ex_unaligned_fixup; + .word load3,ex_unaligned_fixup; + .word load4,ex_unaligned_fixup; + .word load5,ex_unaligned_fixup; + .word store1,ex_unaligned_fixup; + .word store2,ex_unaligned_fixup; + .word store3,ex_unaligned_fixup; + .word store4,ex_unaligned_fixup; + .word store5,ex_unaligned_fixup; + .word store6,ex_unaligned_fixup; +.previous; +.end _unaligned_data_exception +#endif /* CONFIG_MMU */ + +.global ex_handler_unhandled +ex_handler_unhandled: +/* FIXME add handle function for unhandled exception - dump register */ + bri 0 + +/* + * hw_exception_handler Jump Table + * - Contains code snippets for each register that caused the unalign exception + * - Hence exception handler is NOT self-modifying + * - Separate table for load exceptions and store exceptions. + * - Each table is of size: (8 * 32) = 256 bytes + */ + +.section .text +.align 4 +lw_table: +lw_r0: R3_TO_LWREG (0); +lw_r1: LWREG_NOP; +lw_r2: R3_TO_LWREG (2); +lw_r3: R3_TO_LWREG_V (3); +lw_r4: R3_TO_LWREG_V (4); +lw_r5: R3_TO_LWREG_V (5); +lw_r6: R3_TO_LWREG_V (6); +lw_r7: R3_TO_LWREG (7); +lw_r8: R3_TO_LWREG (8); +lw_r9: R3_TO_LWREG (9); +lw_r10: R3_TO_LWREG (10); +lw_r11: R3_TO_LWREG (11); +lw_r12: R3_TO_LWREG (12); +lw_r13: R3_TO_LWREG (13); +lw_r14: R3_TO_LWREG (14); +lw_r15: R3_TO_LWREG (15); +lw_r16: R3_TO_LWREG (16); +lw_r17: LWREG_NOP; +lw_r18: R3_TO_LWREG (18); +lw_r19: R3_TO_LWREG (19); +lw_r20: R3_TO_LWREG (20); +lw_r21: R3_TO_LWREG (21); +lw_r22: R3_TO_LWREG (22); +lw_r23: R3_TO_LWREG (23); +lw_r24: R3_TO_LWREG (24); +lw_r25: R3_TO_LWREG (25); +lw_r26: R3_TO_LWREG (26); +lw_r27: R3_TO_LWREG (27); +lw_r28: R3_TO_LWREG (28); +lw_r29: R3_TO_LWREG (29); +lw_r30: R3_TO_LWREG (30); +#ifdef CONFIG_MMU +lw_r31: R3_TO_LWREG_V (31); +#else +lw_r31: R3_TO_LWREG (31); +#endif + +sw_table: +sw_r0: SWREG_TO_R3 (0); +sw_r1: SWREG_NOP; +sw_r2: SWREG_TO_R3 (2); +sw_r3: SWREG_TO_R3_V (3); +sw_r4: SWREG_TO_R3_V (4); +sw_r5: SWREG_TO_R3_V (5); +sw_r6: SWREG_TO_R3_V (6); +sw_r7: SWREG_TO_R3 (7); +sw_r8: SWREG_TO_R3 (8); +sw_r9: SWREG_TO_R3 (9); +sw_r10: SWREG_TO_R3 (10); +sw_r11: SWREG_TO_R3 (11); +sw_r12: SWREG_TO_R3 (12); +sw_r13: SWREG_TO_R3 (13); +sw_r14: SWREG_TO_R3 (14); +sw_r15: SWREG_TO_R3 (15); +sw_r16: SWREG_TO_R3 (16); +sw_r17: SWREG_NOP; +sw_r18: SWREG_TO_R3 (18); +sw_r19: SWREG_TO_R3 (19); +sw_r20: SWREG_TO_R3 (20); +sw_r21: SWREG_TO_R3 (21); +sw_r22: SWREG_TO_R3 (22); +sw_r23: SWREG_TO_R3 (23); +sw_r24: SWREG_TO_R3 (24); +sw_r25: SWREG_TO_R3 (25); +sw_r26: SWREG_TO_R3 (26); +sw_r27: SWREG_TO_R3 (27); +sw_r28: SWREG_TO_R3 (28); +sw_r29: SWREG_TO_R3 (29); +sw_r30: SWREG_TO_R3 (30); +#ifdef CONFIG_MMU +sw_r31: SWREG_TO_R3_V (31); +#else +sw_r31: SWREG_TO_R3 (31); +#endif + +#ifdef CONFIG_MMU +lw_table_vm: +lw_r0_vm: R3_TO_LWREG_VM (0); +lw_r1_vm: R3_TO_LWREG_VM_V (1); +lw_r2_vm: R3_TO_LWREG_VM_V (2); +lw_r3_vm: R3_TO_LWREG_VM_V (3); +lw_r4_vm: R3_TO_LWREG_VM_V (4); +lw_r5_vm: R3_TO_LWREG_VM_V (5); +lw_r6_vm: R3_TO_LWREG_VM_V (6); +lw_r7_vm: R3_TO_LWREG_VM_V (7); +lw_r8_vm: R3_TO_LWREG_VM_V (8); +lw_r9_vm: R3_TO_LWREG_VM_V (9); +lw_r10_vm: R3_TO_LWREG_VM_V (10); +lw_r11_vm: R3_TO_LWREG_VM_V (11); +lw_r12_vm: R3_TO_LWREG_VM_V (12); +lw_r13_vm: R3_TO_LWREG_VM_V (13); +lw_r14_vm: R3_TO_LWREG_VM_V (14); +lw_r15_vm: R3_TO_LWREG_VM_V (15); +lw_r16_vm: R3_TO_LWREG_VM_V (16); +lw_r17_vm: R3_TO_LWREG_VM_V (17); +lw_r18_vm: R3_TO_LWREG_VM_V (18); +lw_r19_vm: R3_TO_LWREG_VM_V (19); +lw_r20_vm: R3_TO_LWREG_VM_V (20); +lw_r21_vm: R3_TO_LWREG_VM_V (21); +lw_r22_vm: R3_TO_LWREG_VM_V (22); +lw_r23_vm: R3_TO_LWREG_VM_V (23); +lw_r24_vm: R3_TO_LWREG_VM_V (24); +lw_r25_vm: R3_TO_LWREG_VM_V (25); +lw_r26_vm: R3_TO_LWREG_VM_V (26); +lw_r27_vm: R3_TO_LWREG_VM_V (27); +lw_r28_vm: R3_TO_LWREG_VM_V (28); +lw_r29_vm: R3_TO_LWREG_VM_V (29); +lw_r30_vm: R3_TO_LWREG_VM_V (30); +lw_r31_vm: R3_TO_LWREG_VM_V (31); + +sw_table_vm: +sw_r0_vm: SWREG_TO_R3_VM (0); +sw_r1_vm: SWREG_TO_R3_VM_V (1); +sw_r2_vm: SWREG_TO_R3_VM_V (2); +sw_r3_vm: SWREG_TO_R3_VM_V (3); +sw_r4_vm: SWREG_TO_R3_VM_V (4); +sw_r5_vm: SWREG_TO_R3_VM_V (5); +sw_r6_vm: SWREG_TO_R3_VM_V (6); +sw_r7_vm: SWREG_TO_R3_VM_V (7); +sw_r8_vm: SWREG_TO_R3_VM_V (8); +sw_r9_vm: SWREG_TO_R3_VM_V (9); +sw_r10_vm: SWREG_TO_R3_VM_V (10); +sw_r11_vm: SWREG_TO_R3_VM_V (11); +sw_r12_vm: SWREG_TO_R3_VM_V (12); +sw_r13_vm: SWREG_TO_R3_VM_V (13); +sw_r14_vm: SWREG_TO_R3_VM_V (14); +sw_r15_vm: SWREG_TO_R3_VM_V (15); +sw_r16_vm: SWREG_TO_R3_VM_V (16); +sw_r17_vm: SWREG_TO_R3_VM_V (17); +sw_r18_vm: SWREG_TO_R3_VM_V (18); +sw_r19_vm: SWREG_TO_R3_VM_V (19); +sw_r20_vm: SWREG_TO_R3_VM_V (20); +sw_r21_vm: SWREG_TO_R3_VM_V (21); +sw_r22_vm: SWREG_TO_R3_VM_V (22); +sw_r23_vm: SWREG_TO_R3_VM_V (23); +sw_r24_vm: SWREG_TO_R3_VM_V (24); +sw_r25_vm: SWREG_TO_R3_VM_V (25); +sw_r26_vm: SWREG_TO_R3_VM_V (26); +sw_r27_vm: SWREG_TO_R3_VM_V (27); +sw_r28_vm: SWREG_TO_R3_VM_V (28); +sw_r29_vm: SWREG_TO_R3_VM_V (29); +sw_r30_vm: SWREG_TO_R3_VM_V (30); +sw_r31_vm: SWREG_TO_R3_VM_V (31); +#endif /* CONFIG_MMU */ + +/* Temporary data structures used in the handler */ +.section .data +.align 4 +ex_tmp_data_loc_0: + .byte 0 +ex_tmp_data_loc_1: + .byte 0 +ex_tmp_data_loc_2: + .byte 0 +ex_tmp_data_loc_3: + .byte 0 +ex_reg_op: + .byte 0 diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c new file mode 100644 index 000000000..903dad822 --- /dev/null +++ b/arch/microblaze/kernel/irq.c @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/ftrace.h> +#include <linux/kernel.h> +#include <linux/hardirq.h> +#include <linux/interrupt.h> +#include <linux/irqflags.h> +#include <linux/seq_file.h> +#include <linux/kernel_stat.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/of_irq.h> + +static u32 concurrent_irq; + +void __irq_entry do_IRQ(struct pt_regs *regs) +{ + unsigned int irq; + struct pt_regs *old_regs = set_irq_regs(regs); + trace_hardirqs_off(); + + irq_enter(); + irq = xintc_get_irq(); +next_irq: + BUG_ON(!irq); + generic_handle_irq(irq); + + irq = xintc_get_irq(); + if (irq != -1U) { + pr_debug("next irq: %d\n", irq); + ++concurrent_irq; + goto next_irq; + } + + irq_exit(); + set_irq_regs(old_regs); + trace_hardirqs_on(); +} + +void __init init_IRQ(void) +{ + /* process the entire interrupt tree in one go */ + irqchip_init(); +} diff --git a/arch/microblaze/kernel/kgdb.c b/arch/microblaze/kernel/kgdb.c new file mode 100644 index 000000000..6366f69d1 --- /dev/null +++ b/arch/microblaze/kernel/kgdb.c @@ -0,0 +1,152 @@ +/* + * Microblaze KGDB support + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kgdb.h> +#include <linux/kdebug.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <asm/cacheflush.h> +#include <asm/asm-offsets.h> +#include <asm/kgdb.h> +#include <asm/pvr.h> + +#define GDB_REG 0 +#define GDB_PC 32 +#define GDB_MSR 33 +#define GDB_EAR 34 +#define GDB_ESR 35 +#define GDB_FSR 36 +#define GDB_BTR 37 +#define GDB_PVR 38 +#define GDB_REDR 50 +#define GDB_RPID 51 +#define GDB_RZPR 52 +#define GDB_RTLBX 53 +#define GDB_RTLBSX 54 /* mfs can't read it */ +#define GDB_RTLBLO 55 +#define GDB_RTLBHI 56 + +/* keep pvr separately because it is unchangeble */ +static struct pvr_s pvr; + +void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + unsigned int i; + unsigned long *pt_regb = (unsigned long *)regs; + int temp; + + /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */ + for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++) + gdb_regs[i] = pt_regb[i]; + + /* Branch target register can't be changed */ + __asm__ __volatile__ ("mfs %0, rbtr;" : "=r"(temp) : ); + gdb_regs[GDB_BTR] = temp; + + /* pvr part - we have 11 pvr regs */ + for (i = 0; i < sizeof(struct pvr_s)/4; i++) + gdb_regs[GDB_PVR + i] = pvr.pvr[i]; + + /* read special registers - can't be changed */ + __asm__ __volatile__ ("mfs %0, redr;" : "=r"(temp) : ); + gdb_regs[GDB_REDR] = temp; + __asm__ __volatile__ ("mfs %0, rpid;" : "=r"(temp) : ); + gdb_regs[GDB_RPID] = temp; + __asm__ __volatile__ ("mfs %0, rzpr;" : "=r"(temp) : ); + gdb_regs[GDB_RZPR] = temp; + __asm__ __volatile__ ("mfs %0, rtlbx;" : "=r"(temp) : ); + gdb_regs[GDB_RTLBX] = temp; + __asm__ __volatile__ ("mfs %0, rtlblo;" : "=r"(temp) : ); + gdb_regs[GDB_RTLBLO] = temp; + __asm__ __volatile__ ("mfs %0, rtlbhi;" : "=r"(temp) : ); + gdb_regs[GDB_RTLBHI] = temp; +} + +void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + unsigned int i; + unsigned long *pt_regb = (unsigned long *)regs; + + /* pt_regs and gdb_regs have the same 37 values. + * The rest of gdb_regs are unused and can't be changed. + * r0 register value can't be changed too. */ + for (i = 1; i < (sizeof(struct pt_regs) / 4) - 1; i++) + pt_regb[i] = gdb_regs[i]; +} + +asmlinkage void microblaze_kgdb_break(struct pt_regs *regs) +{ + if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) + return; + + /* Jump over the first arch_kgdb_breakpoint which is barrier to + * get kgdb work. The same solution is used for powerpc */ + if (*(u32 *) (regs->pc) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr)) + regs->pc += BREAK_INSTR_SIZE; +} + +/* untested */ +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ + unsigned int i; + unsigned long *pt_regb = (unsigned long *)(p->thread.regs); + + /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */ + for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++) + gdb_regs[i] = pt_regb[i]; + + /* pvr part - we have 11 pvr regs */ + for (i = 0; i < sizeof(struct pvr_s)/4; i++) + gdb_regs[GDB_PVR + i] = pvr.pvr[i]; +} + +void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) +{ + regs->pc = ip; +} + +int kgdb_arch_handle_exception(int vector, int signo, int err_code, + char *remcom_in_buffer, char *remcom_out_buffer, + struct pt_regs *regs) +{ + char *ptr; + unsigned long address; + + switch (remcom_in_buffer[0]) { + case 'c': + /* handle the optional parameter */ + ptr = &remcom_in_buffer[1]; + if (kgdb_hex2long(&ptr, &address)) + regs->pc = address; + + return 0; + } + return -1; /* this means that we do not want to exit from the handler */ +} + +int kgdb_arch_init(void) +{ + get_pvr(&pvr); /* Fill PVR structure */ + return 0; +} + +void kgdb_arch_exit(void) +{ + /* Nothing to do */ +} + +/* + * Global data + */ +struct kgdb_arch arch_kgdb_ops = { +#ifdef __MICROBLAZEEL__ + .gdb_bpt_instr = {0x18, 0x00, 0x0c, 0xba}, /* brki r16, 0x18 */ +#else + .gdb_bpt_instr = {0xba, 0x0c, 0x00, 0x18}, /* brki r16, 0x18 */ +#endif +}; diff --git a/arch/microblaze/kernel/mcount.S b/arch/microblaze/kernel/mcount.S new file mode 100644 index 000000000..fed9da5de --- /dev/null +++ b/arch/microblaze/kernel/mcount.S @@ -0,0 +1,165 @@ +/* + * Low-level ftrace handling + * + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/linkage.h> + +#define NOALIGN_ENTRY(name) .globl name; name: + +/* FIXME MS: I think that I don't need to save all regs */ +#define SAVE_REGS \ + addik r1, r1, -120; \ + swi r2, r1, 4; \ + swi r3, r1, 8; \ + swi r4, r1, 12; \ + swi r5, r1, 116; \ + swi r6, r1, 16; \ + swi r7, r1, 20; \ + swi r8, r1, 24; \ + swi r9, r1, 28; \ + swi r10, r1, 32; \ + swi r11, r1, 36; \ + swi r12, r1, 40; \ + swi r13, r1, 44; \ + swi r14, r1, 48; \ + swi r16, r1, 52; \ + swi r17, r1, 56; \ + swi r18, r1, 60; \ + swi r19, r1, 64; \ + swi r20, r1, 68; \ + swi r21, r1, 72; \ + swi r22, r1, 76; \ + swi r23, r1, 80; \ + swi r24, r1, 84; \ + swi r25, r1, 88; \ + swi r26, r1, 92; \ + swi r27, r1, 96; \ + swi r28, r1, 100; \ + swi r29, r1, 104; \ + swi r30, r1, 108; \ + swi r31, r1, 112; + +#define RESTORE_REGS \ + lwi r2, r1, 4; \ + lwi r3, r1, 8; \ + lwi r4, r1, 12; \ + lwi r5, r1, 116; \ + lwi r6, r1, 16; \ + lwi r7, r1, 20; \ + lwi r8, r1, 24; \ + lwi r9, r1, 28; \ + lwi r10, r1, 32; \ + lwi r11, r1, 36; \ + lwi r12, r1, 40; \ + lwi r13, r1, 44; \ + lwi r14, r1, 48; \ + lwi r16, r1, 52; \ + lwi r17, r1, 56; \ + lwi r18, r1, 60; \ + lwi r19, r1, 64; \ + lwi r20, r1, 68; \ + lwi r21, r1, 72; \ + lwi r22, r1, 76; \ + lwi r23, r1, 80; \ + lwi r24, r1, 84; \ + lwi r25, r1, 88; \ + lwi r26, r1, 92; \ + lwi r27, r1, 96; \ + lwi r28, r1, 100; \ + lwi r29, r1, 104; \ + lwi r30, r1, 108; \ + lwi r31, r1, 112; \ + addik r1, r1, 120; + +ENTRY(ftrace_stub) + rtsd r15, 8; + nop; + +ENTRY(_mcount) +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(ftrace_caller) + /* MS: It is just barrier which is removed from C code */ + rtsd r15, 8 + nop +#endif /* CONFIG_DYNAMIC_FTRACE */ + SAVE_REGS + swi r15, r1, 0; +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +#ifndef CONFIG_DYNAMIC_FTRACE + lwi r5, r0, ftrace_graph_return; + addik r6, r0, ftrace_stub; /* asm implementation */ + cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */ + beqid r5, end_graph_tracer; + nop; + + lwi r6, r0, ftrace_graph_entry; + addik r5, r0, ftrace_graph_entry_stub; /* implemented in C */ + cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */ + beqid r5, end_graph_tracer; + nop; +#else /* CONFIG_DYNAMIC_FTRACE */ +NOALIGN_ENTRY(ftrace_call_graph) + /* MS: jump over graph function - replaced from C code */ + bri end_graph_tracer +#endif /* CONFIG_DYNAMIC_FTRACE */ + addik r5, r1, 120; /* MS: load parent addr */ + addik r6, r15, 0; /* MS: load current function addr */ + bralid r15, prepare_ftrace_return; + nop; + /* MS: graph was taken that's why - can jump over function trace */ + brid end; + nop; +end_graph_tracer: +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ +#ifndef CONFIG_DYNAMIC_FTRACE + /* MS: test function trace if is taken or not */ + lwi r20, r0, ftrace_trace_function; + addik r6, r0, ftrace_stub; + cmpu r5, r20, r6; /* ftrace_trace_function != ftrace_stub */ + beqid r5, end; /* MS: not taken -> jump over */ + nop; +#else /* CONFIG_DYNAMIC_FTRACE */ +NOALIGN_ENTRY(ftrace_call) +/* instruction for setup imm FUNC_part1, addik r20, r0, FUNC_part2 */ + nop + nop +#endif /* CONFIG_DYNAMIC_FTRACE */ +/* static normal trace */ + lwi r6, r1, 120; /* MS: load parent addr */ + addik r5, r15, -4; /* MS: load current function addr */ + /* MS: here is dependency on previous code */ + brald r15, r20; /* MS: jump to ftrace handler */ + nop; +end: + lwi r15, r1, 0; + RESTORE_REGS + + rtsd r15, 8; /* MS: jump back */ + nop; + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(return_to_handler) + nop; /* MS: just barrier for rtsd r15, 8 */ + nop; + SAVE_REGS + swi r15, r1, 0; + + /* MS: find out returning address */ + bralid r15, ftrace_return_to_handler; + nop; + + /* MS: return value from ftrace_return_to_handler is my returning addr + * must be before restore regs because I have to restore r3 content */ + addik r15, r3, 0; + RESTORE_REGS + + rtsd r15, 8; /* MS: jump back */ + nop; +#endif /* CONFIG_FUNCTION_TRACER */ diff --git a/arch/microblaze/kernel/microblaze_ksyms.c b/arch/microblaze/kernel/microblaze_ksyms.c new file mode 100644 index 000000000..9f1d02c4c --- /dev/null +++ b/arch/microblaze/kernel/microblaze_ksyms.c @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/export.h> +#include <linux/string.h> +#include <linux/cryptohash.h> +#include <linux/delay.h> +#include <linux/in6.h> +#include <linux/syscalls.h> + +#include <asm/checksum.h> +#include <asm/cacheflush.h> +#include <linux/io.h> +#include <asm/page.h> +#include <linux/ftrace.h> +#include <linux/uaccess.h> + +#ifdef CONFIG_FUNCTION_TRACER +extern void _mcount(void); +EXPORT_SYMBOL(_mcount); +#endif + +/* + * Assembly functions that may be used (directly or indirectly) by modules + */ +EXPORT_SYMBOL(__copy_tofrom_user); +EXPORT_SYMBOL(__strncpy_user); + +#ifdef CONFIG_OPT_LIB_ASM +EXPORT_SYMBOL(memcpy); +EXPORT_SYMBOL(memmove); +#endif + +#ifdef CONFIG_MMU +EXPORT_SYMBOL(empty_zero_page); +#endif + +EXPORT_SYMBOL(mbc); + +extern void __divsi3(void); +EXPORT_SYMBOL(__divsi3); +extern void __modsi3(void); +EXPORT_SYMBOL(__modsi3); +extern void __mulsi3(void); +EXPORT_SYMBOL(__mulsi3); +extern void __udivsi3(void); +EXPORT_SYMBOL(__udivsi3); +extern void __umodsi3(void); +EXPORT_SYMBOL(__umodsi3); diff --git a/arch/microblaze/kernel/misc.S b/arch/microblaze/kernel/misc.S new file mode 100644 index 000000000..6759af688 --- /dev/null +++ b/arch/microblaze/kernel/misc.S @@ -0,0 +1,65 @@ +/* + * Miscellaneous low-level MMU functions. + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * Copyright (C) 2007 Xilinx, Inc. All rights reserved. + * + * Derived from arch/ppc/kernel/misc.S + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/linkage.h> +#include <linux/sys.h> +#include <asm/unistd.h> +#include <linux/errno.h> +#include <asm/mmu.h> +#include <asm/page.h> + + .text +/* + * Flush MMU TLB + * + * We avoid flushing the pinned 0, 1 and possibly 2 entries. + */ +.globl _tlbia; +.type _tlbia, @function +.align 4; +_tlbia: + lwi r12, r0, tlb_skip; + /* isync */ +_tlbia_1: + mts rtlbx, r12 + nop + mts rtlbhi, r0 /* flush: ensure V is clear */ + nop + rsubi r11, r12, MICROBLAZE_TLB_SIZE - 1 + bneid r11, _tlbia_1 /* loop for all entries */ + addik r12, r12, 1 + /* sync */ + rtsd r15, 8 + nop + .size _tlbia, . - _tlbia + +/* + * Flush MMU TLB for a particular address (in r5) + */ +.globl _tlbie; +.type _tlbie, @function +.align 4; +_tlbie: + mts rtlbsx, r5 /* look up the address in TLB */ + nop + mfs r12, rtlbx /* Retrieve index */ + nop + blti r12, _tlbie_1 /* Check if found */ + mts rtlbhi, r0 /* flush: ensure V is clear */ + nop +_tlbie_1: + rtsd r15, 8 + nop + + .size _tlbie, . - _tlbie diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c new file mode 100644 index 000000000..182e6be85 --- /dev/null +++ b/arch/microblaze/kernel/module.c @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/export.h> +#include <linux/moduleloader.h> +#include <linux/kernel.h> +#include <linux/elf.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <linux/string.h> + +#include <asm/pgtable.h> +#include <asm/cacheflush.h> + +int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, struct module *module) +{ + + unsigned int i; + Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; + Elf32_Sym *sym; + unsigned long int *location; + unsigned long int value; +#if __GNUC__ < 4 + unsigned long int old_value; +#endif + + pr_debug("Applying add relocation section %u to %u\n", + relsec, sechdrs[relsec].sh_info); + + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { + + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rela[i].r_offset; + sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(rela[i].r_info); + value = sym->st_value + rela[i].r_addend; + + switch (ELF32_R_TYPE(rela[i].r_info)) { + + /* + * Be careful! mb-gcc / mb-ld splits the relocs between the + * text and the reloc table. In general this means we must + * read the current contents of (*location), add any offset + * then store the result back in + */ + + case R_MICROBLAZE_32: +#if __GNUC__ < 4 + old_value = *location; + *location = value + old_value; + + pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n", + old_value, value); +#else + *location = value; +#endif + break; + + case R_MICROBLAZE_64: +#if __GNUC__ < 4 + /* Split relocs only required/used pre gcc4.1.1 */ + old_value = ((location[0] & 0x0000FFFF) << 16) | + (location[1] & 0x0000FFFF); + value += old_value; +#endif + location[0] = (location[0] & 0xFFFF0000) | + (value >> 16); + location[1] = (location[1] & 0xFFFF0000) | + (value & 0xFFFF); +#if __GNUC__ < 4 + pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n", + old_value, value); +#endif + break; + + case R_MICROBLAZE_64_PCREL: +#if __GNUC__ < 4 + old_value = (location[0] & 0xFFFF) << 16 | + (location[1] & 0xFFFF); + value -= old_value; +#endif + value -= (unsigned long int)(location) + 4; + location[0] = (location[0] & 0xFFFF0000) | + (value >> 16); + location[1] = (location[1] & 0xFFFF0000) | + (value & 0xFFFF); + pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", + value); + break; + + case R_MICROBLAZE_32_PCREL_LO: + pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); + break; + + case R_MICROBLAZE_64_NONE: + pr_debug("R_MICROBLAZE_64_NONE\n"); + break; + + case R_MICROBLAZE_NONE: + pr_debug("R_MICROBLAZE_NONE\n"); + break; + + default: + pr_err("module %s: Unknown relocation: %u\n", + module->name, + ELF32_R_TYPE(rela[i].r_info)); + return -ENOEXEC; + } + } + return 0; +} + +int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, + struct module *module) +{ + flush_dcache(); + return 0; +} diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c new file mode 100644 index 000000000..6527ec22f --- /dev/null +++ b/arch/microblaze/kernel/process.c @@ -0,0 +1,154 @@ +/* + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/cpu.h> +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task.h> +#include <linux/sched/task_stack.h> +#include <linux/pm.h> +#include <linux/tick.h> +#include <linux/bitops.h> +#include <linux/ptrace.h> +#include <asm/pgalloc.h> +#include <linux/uaccess.h> /* for USER_DS macros */ +#include <asm/cacheflush.h> + +void show_regs(struct pt_regs *regs) +{ + show_regs_print_info(KERN_INFO); + + pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode); + pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n", + regs->r1, regs->r2, regs->r3, regs->r4); + pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n", + regs->r5, regs->r6, regs->r7, regs->r8); + pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n", + regs->r9, regs->r10, regs->r11, regs->r12); + pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n", + regs->r13, regs->r14, regs->r15, regs->r16); + pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n", + regs->r17, regs->r18, regs->r19, regs->r20); + pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n", + regs->r21, regs->r22, regs->r23, regs->r24); + pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n", + regs->r25, regs->r26, regs->r27, regs->r28); + pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n", + regs->r29, regs->r30, regs->r31, regs->pc); + pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n", + regs->msr, regs->ear, regs->esr, regs->fsr); +} + +void (*pm_power_off)(void) = NULL; +EXPORT_SYMBOL(pm_power_off); + +void flush_thread(void) +{ +} + +int copy_thread(unsigned long clone_flags, unsigned long usp, + unsigned long arg, struct task_struct *p) +{ + struct pt_regs *childregs = task_pt_regs(p); + struct thread_info *ti = task_thread_info(p); + + if (unlikely(p->flags & PF_KTHREAD)) { + /* if we're creating a new kernel thread then just zeroing all + * the registers. That's OK for a brand new thread.*/ + memset(childregs, 0, sizeof(struct pt_regs)); + memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); + ti->cpu_context.r1 = (unsigned long)childregs; + ti->cpu_context.r20 = (unsigned long)usp; /* fn */ + ti->cpu_context.r19 = (unsigned long)arg; + childregs->pt_mode = 1; + local_save_flags(childregs->msr); +#ifdef CONFIG_MMU + ti->cpu_context.msr = childregs->msr & ~MSR_IE; +#endif + ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; + return 0; + } + *childregs = *current_pt_regs(); + if (usp) + childregs->r1 = usp; + + memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); + ti->cpu_context.r1 = (unsigned long)childregs; +#ifndef CONFIG_MMU + ti->cpu_context.msr = (unsigned long)childregs->msr; +#else + childregs->msr |= MSR_UMS; + + /* we should consider the fact that childregs is a copy of the parent + * regs which were saved immediately after entering the kernel state + * before enabling VM. This MSR will be restored in switch_to and + * RETURN() and we want to have the right machine state there + * specifically this state must have INTs disabled before and enabled + * after performing rtbd + * compose the right MSR for RETURN(). It will work for switch_to also + * excepting for VM and UMS + * don't touch UMS , CARRY and cache bits + * right now MSR is a copy of parent one */ + childregs->msr &= ~MSR_EIP; + childregs->msr |= MSR_IE; + childregs->msr &= ~MSR_VM; + childregs->msr |= MSR_VMS; + childregs->msr |= MSR_EE; /* exceptions will be enabled*/ + + ti->cpu_context.msr = (childregs->msr|MSR_VM); + ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ + ti->cpu_context.msr &= ~MSR_IE; +#endif + ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; + + /* + * r21 is the thread reg, r10 is 6th arg to clone + * which contains TLS area + */ + if (clone_flags & CLONE_SETTLS) + childregs->r21 = childregs->r10; + + return 0; +} + +unsigned long get_wchan(struct task_struct *p) +{ +/* TBD (used by procfs) */ + return 0; +} + +/* Set up a thread for executing a new program */ +void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) +{ + regs->pc = pc; + regs->r1 = usp; + regs->pt_mode = 0; +#ifdef CONFIG_MMU + regs->msr |= MSR_UMS; + regs->msr &= ~MSR_VM; +#endif +} + +#ifdef CONFIG_MMU +#include <linux/elfcore.h> +/* + * Set up a thread for executing a new program + */ +int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) +{ + return 0; /* MicroBlaze has no separate FPU registers */ +} +#endif /* CONFIG_MMU */ + +void arch_cpu_idle(void) +{ + local_irq_enable(); +} diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c new file mode 100644 index 000000000..c76c93b90 --- /dev/null +++ b/arch/microblaze/kernel/prom.c @@ -0,0 +1,34 @@ +/* + * Procedures for creating, accessing and interpreting the device tree. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/memblock.h> +#include <linux/of_fdt.h> + +void __init early_init_devtree(void *params) +{ + pr_debug(" -> early_init_devtree(%p)\n", params); + + early_init_dt_scan(params); + if (!strlen(boot_command_line)) + strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); + + memblock_allow_resize(); + + pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size()); + + pr_debug(" <- early_init_devtree()\n"); +} diff --git a/arch/microblaze/kernel/ptrace.c b/arch/microblaze/kernel/ptrace.c new file mode 100644 index 000000000..badd28688 --- /dev/null +++ b/arch/microblaze/kernel/ptrace.c @@ -0,0 +1,170 @@ +/* + * `ptrace' system call + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2004-2007 John Williams <john.williams@petalogix.com> + * + * derived from arch/v850/kernel/ptrace.c + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * Derived from arch/mips/kernel/ptrace.c: + * + * Copyright (C) 1992 Ross Biro + * Copyright (C) Linus Torvalds + * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle + * Copyright (C) 1996 David S. Miller + * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com + * Copyright (C) 1999 MIPS Technologies, Inc. + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/sched/task_stack.h> +#include <linux/ptrace.h> +#include <linux/signal.h> +#include <linux/elf.h> +#include <linux/audit.h> +#include <linux/seccomp.h> +#include <linux/tracehook.h> + +#include <linux/errno.h> +#include <asm/processor.h> +#include <linux/uaccess.h> +#include <asm/asm-offsets.h> +#include <asm/cacheflush.h> +#include <asm/syscall.h> +#include <linux/io.h> + +/* Returns the address where the register at REG_OFFS in P is stashed away. */ +static microblaze_reg_t *reg_save_addr(unsigned reg_offs, + struct task_struct *t) +{ + struct pt_regs *regs; + + /* + * Three basic cases: + * + * (1) A register normally saved before calling the scheduler, is + * available in the kernel entry pt_regs structure at the top + * of the kernel stack. The kernel trap/irq exit path takes + * care to save/restore almost all registers for ptrace'd + * processes. + * + * (2) A call-clobbered register, where the process P entered the + * kernel via [syscall] trap, is not stored anywhere; that's + * OK, because such registers are not expected to be preserved + * when the trap returns anyway (so we don't actually bother to + * test for this case). + * + * (3) A few registers not used at all by the kernel, and so + * normally never saved except by context-switches, are in the + * context switch state. + */ + + /* Register saved during kernel entry (or not available). */ + regs = task_pt_regs(t); + + return (microblaze_reg_t *)((char *)regs + reg_offs); +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + int rval; + unsigned long val = 0; + + switch (request) { + /* Read/write the word at location ADDR in the registers. */ + case PTRACE_PEEKUSR: + case PTRACE_POKEUSR: + pr_debug("PEEKUSR/POKEUSR : 0x%08lx\n", addr); + rval = 0; + if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) { + /* + * Special requests that don't actually correspond + * to offsets in struct pt_regs. + */ + if (addr == PT_TEXT_ADDR) { + val = child->mm->start_code; + } else if (addr == PT_DATA_ADDR) { + val = child->mm->start_data; + } else if (addr == PT_TEXT_LEN) { + val = child->mm->end_code + - child->mm->start_code; + } else { + rval = -EIO; + } + } else if (addr < PT_SIZE && (addr & 0x3) == 0) { + microblaze_reg_t *reg_addr = reg_save_addr(addr, child); + if (request == PTRACE_PEEKUSR) + val = *reg_addr; + else { +#if 1 + *reg_addr = data; +#else + /* MS potential problem on WB system + * Be aware that reg_addr is virtual address + * virt_to_phys conversion is necessary. + * This could be sensible solution. + */ + u32 paddr = virt_to_phys((u32)reg_addr); + invalidate_icache_range(paddr, paddr + 4); + *reg_addr = data; + flush_dcache_range(paddr, paddr + 4); +#endif + } + } else + rval = -EIO; + + if (rval == 0 && request == PTRACE_PEEKUSR) + rval = put_user(val, (unsigned long __user *)data); + break; + default: + rval = ptrace_request(child, request, addr, data); + } + return rval; +} + +asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs) +{ + unsigned long ret = 0; + + secure_computing_strict(regs->r12); + + if (test_thread_flag(TIF_SYSCALL_TRACE) && + tracehook_report_syscall_entry(regs)) + /* + * Tracing decided this syscall should not happen. + * We'll return a bogus call number to get an ENOSYS + * error, but leave the original number in regs->regs[0]. + */ + ret = -1L; + + audit_syscall_entry(regs->r12, regs->r5, regs->r6, regs->r7, regs->r8); + + return ret ?: regs->r12; +} + +asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) +{ + int step; + + audit_syscall_exit(regs); + + step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, step); +} + +void ptrace_disable(struct task_struct *child) +{ + /* nothing to do */ +} diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c new file mode 100644 index 000000000..fcbe1daf6 --- /dev/null +++ b/arch/microblaze/kernel/reset.c @@ -0,0 +1,108 @@ +/* + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/of_platform.h> + +/* Trigger specific functions */ +#ifdef CONFIG_GPIOLIB + +#include <linux/of_gpio.h> + +static int handle; /* reset pin handle */ +static unsigned int reset_val; + +static int of_platform_reset_gpio_probe(void) +{ + int ret; + handle = of_get_named_gpio(of_find_node_by_path("/"), + "hard-reset-gpios", 0); + + if (!gpio_is_valid(handle)) { + pr_info("Skipping unavailable RESET gpio %d (%s)\n", + handle, "reset"); + return -ENODEV; + } + + ret = gpio_request(handle, "reset"); + if (ret < 0) { + pr_info("GPIO pin is already allocated\n"); + return ret; + } + + /* get current setup value */ + reset_val = gpio_get_value(handle); + /* FIXME maybe worth to perform any action */ + pr_debug("Reset: Gpio output state: 0x%x\n", reset_val); + + /* Setup GPIO as output */ + ret = gpio_direction_output(handle, 0); + if (ret < 0) + goto err; + + /* Setup output direction */ + gpio_set_value(handle, 0); + + pr_info("RESET: Registered gpio device: %d, current val: %d\n", + handle, reset_val); + return 0; +err: + gpio_free(handle); + return ret; +} +device_initcall(of_platform_reset_gpio_probe); + + +static void gpio_system_reset(void) +{ + if (gpio_is_valid(handle)) + gpio_set_value(handle, 1 - reset_val); + else + pr_notice("Reset GPIO unavailable - halting!\n"); +} +#else +static void gpio_system_reset(void) +{ + pr_notice("No reset GPIO present - halting!\n"); +} + +void of_platform_reset_gpio_probe(void) +{ + return; +} +#endif + +void machine_restart(char *cmd) +{ + pr_notice("Machine restart...\n"); + gpio_system_reset(); + while (1) + ; +} + +void machine_shutdown(void) +{ + pr_notice("Machine shutdown...\n"); + while (1) + ; +} + +void machine_halt(void) +{ + pr_notice("Machine halt...\n"); + while (1) + ; +} + +void machine_power_off(void) +{ + pr_notice("Machine power off...\n"); + while (1) + ; +} diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c new file mode 100644 index 000000000..bbd6968ce --- /dev/null +++ b/arch/microblaze/kernel/setup.c @@ -0,0 +1,216 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/clk-provider.h> +#include <linux/clocksource.h> +#include <linux/string.h> +#include <linux/seq_file.h> +#include <linux/cpu.h> +#include <linux/initrd.h> +#include <linux/console.h> +#include <linux/debugfs.h> +#include <linux/of_fdt.h> + +#include <asm/setup.h> +#include <asm/sections.h> +#include <asm/page.h> +#include <linux/io.h> +#include <linux/bug.h> +#include <linux/param.h> +#include <linux/pci.h> +#include <linux/cache.h> +#include <linux/of.h> +#include <linux/dma-mapping.h> +#include <asm/cacheflush.h> +#include <asm/entry.h> +#include <asm/cpuinfo.h> + +#include <asm/pgtable.h> + +DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ +DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ +DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ +DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ +DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ + +unsigned int boot_cpuid; +/* + * Placed cmd_line to .data section because can be initialized from + * ASM code. Default position is BSS section which is cleared + * in machine_early_init(). + */ +char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); + +void __init setup_arch(char **cmdline_p) +{ + *cmdline_p = boot_command_line; + + setup_memory(); + parse_early_param(); + + console_verbose(); + + unflatten_device_tree(); + + setup_cpuinfo(); + + microblaze_cache_init(); + + xilinx_pci_init(); + +#if defined(CONFIG_DUMMY_CONSOLE) + conswitchp = &dummy_con; +#endif +} + +#ifdef CONFIG_MTD_UCLINUX +/* Handle both romfs and cramfs types, without generating unnecessary + code (ie no point checking for CRAMFS if it's not even enabled) */ +inline unsigned get_romfs_len(unsigned *addr) +{ +#ifdef CONFIG_ROMFS_FS + if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ + return be32_to_cpu(addr[2]); +#endif + +#ifdef CONFIG_CRAMFS + if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ + return le32_to_cpu(addr[1]); +#endif + return 0; +} +#endif /* CONFIG_MTD_UCLINUX_EBSS */ + +unsigned long kernel_tlb; + +void __init machine_early_init(const char *cmdline, unsigned int ram, + unsigned int fdt, unsigned int msr, unsigned int tlb0, + unsigned int tlb1) +{ + unsigned long *src, *dst; + unsigned int offset = 0; + + /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the + * end of kernel. There are two position which we want to check. + * The first is __init_end and the second __bss_start. + */ +#ifdef CONFIG_MTD_UCLINUX + int romfs_size; + unsigned int romfs_base; + char *old_klimit = klimit; + + romfs_base = (ram ? ram : (unsigned int)&__init_end); + romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); + if (!romfs_size) { + romfs_base = (unsigned int)&__bss_start; + romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); + } + + /* Move ROMFS out of BSS before clearing it */ + if (romfs_size > 0) { + memmove(&__bss_stop, (int *)romfs_base, romfs_size); + klimit += romfs_size; + } +#endif + +/* clearing bss section */ + memset(__bss_start, 0, __bss_stop-__bss_start); + memset(_ssbss, 0, _esbss-_ssbss); + +/* initialize device tree for usage in early_printk */ + early_init_devtree(_fdt_start); + + /* setup kernel_tlb after BSS cleaning + * Maybe worth to move to asm code */ + kernel_tlb = tlb0 + tlb1; + /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, + tlb1, kernel_tlb); */ + + pr_info("Ramdisk addr 0x%08x, ", ram); + if (fdt) + pr_info("FDT at 0x%08x\n", fdt); + else + pr_info("Compiled-in FDT at %p\n", _fdt_start); + +#ifdef CONFIG_MTD_UCLINUX + pr_info("Found romfs @ 0x%08x (0x%08x)\n", + romfs_base, romfs_size); + pr_info("#### klimit %p ####\n", old_klimit); + BUG_ON(romfs_size < 0); /* What else can we do? */ + + pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", + romfs_size, romfs_base, (unsigned)&__bss_stop); + + pr_info("New klimit: 0x%08x\n", (unsigned)klimit); +#endif + +#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR + if (msr) { + pr_info("!!!Your kernel has setup MSR instruction but "); + pr_cont("CPU don't have it %x\n", msr); + } +#else + if (!msr) { + pr_info("!!!Your kernel not setup MSR instruction but "); + pr_cont("CPU have it %x\n", msr); + } +#endif + + /* Do not copy reset vectors. offset = 0x2 means skip the first + * two instructions. dst is pointer to MB vectors which are placed + * in block ram. If you want to copy reset vector setup offset to 0x0 */ +#if !CONFIG_MANUAL_RESET_VECTOR + offset = 0x2; +#endif + dst = (unsigned long *) (offset * sizeof(u32)); + for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) + *dst = *src; + + /* Initialize global data */ + per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ + per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; +} + +void __init time_init(void) +{ + of_clk_init(NULL); + setup_cpuinfo_clk(); + timer_probe(); +} + +#ifdef CONFIG_DEBUG_FS +struct dentry *of_debugfs_root; + +static int microblaze_debugfs_init(void) +{ + of_debugfs_root = debugfs_create_dir("microblaze", NULL); + + return of_debugfs_root == NULL; +} +arch_initcall(microblaze_debugfs_init); + +# ifdef CONFIG_MMU +static int __init debugfs_tlb(void) +{ + struct dentry *d; + + if (!of_debugfs_root) + return -ENODEV; + + d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); + if (!d) + return -ENOMEM; + + return 0; +} +device_initcall(debugfs_tlb); +# endif +#endif diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c new file mode 100644 index 000000000..97001524c --- /dev/null +++ b/arch/microblaze/kernel/signal.c @@ -0,0 +1,325 @@ +/* + * Signal handling + * + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au> + * Copyright (C) 2001 NEC Corporation + * Copyright (C) 2001 Miles Bader <miles@gnu.org> + * Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima + * Copyright (C) 1991,1992 Linus Torvalds + * + * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson + * + * This file was was derived from the sh version, arch/sh/kernel/signal.c + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/personality.h> +#include <linux/percpu.h> +#include <linux/linkage.h> +#include <linux/tracehook.h> +#include <asm/entry.h> +#include <asm/ucontext.h> +#include <linux/uaccess.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <linux/syscalls.h> +#include <asm/cacheflush.h> +#include <asm/syscalls.h> + +/* + * Do a signal return; undo the signal stack. + */ +struct sigframe { + struct sigcontext sc; + unsigned long extramask[_NSIG_WORDS-1]; + unsigned long tramp[2]; /* signal trampoline */ +}; + +struct rt_sigframe { + struct siginfo info; + struct ucontext uc; + unsigned long tramp[2]; /* signal trampoline */ +}; + +static int restore_sigcontext(struct pt_regs *regs, + struct sigcontext __user *sc, int *rval_p) +{ + unsigned int err = 0; + +#define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); } + COPY(r0); + COPY(r1); + COPY(r2); COPY(r3); COPY(r4); COPY(r5); + COPY(r6); COPY(r7); COPY(r8); COPY(r9); + COPY(r10); COPY(r11); COPY(r12); COPY(r13); + COPY(r14); COPY(r15); COPY(r16); COPY(r17); + COPY(r18); COPY(r19); COPY(r20); COPY(r21); + COPY(r22); COPY(r23); COPY(r24); COPY(r25); + COPY(r26); COPY(r27); COPY(r28); COPY(r29); + COPY(r30); COPY(r31); + COPY(pc); COPY(ear); COPY(esr); COPY(fsr); +#undef COPY + + *rval_p = regs->r3; + + return err; +} + +asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) +{ + struct rt_sigframe __user *frame = + (struct rt_sigframe __user *)(regs->r1); + + sigset_t set; + int rval; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) + goto badframe; + + set_current_blocked(&set); + + if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval)) + goto badframe; + + if (restore_altstack(&frame->uc.uc_stack)) + goto badframe; + + return rval; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +/* + * Set up a signal frame. + */ + +static int +setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, + unsigned long mask) +{ + int err = 0; + +#define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); } + COPY(r0); + COPY(r1); + COPY(r2); COPY(r3); COPY(r4); COPY(r5); + COPY(r6); COPY(r7); COPY(r8); COPY(r9); + COPY(r10); COPY(r11); COPY(r12); COPY(r13); + COPY(r14); COPY(r15); COPY(r16); COPY(r17); + COPY(r18); COPY(r19); COPY(r20); COPY(r21); + COPY(r22); COPY(r23); COPY(r24); COPY(r25); + COPY(r26); COPY(r27); COPY(r28); COPY(r29); + COPY(r30); COPY(r31); + COPY(pc); COPY(ear); COPY(esr); COPY(fsr); +#undef COPY + + err |= __put_user(mask, &sc->oldmask); + + return err; +} + +/* + * Determine which stack to use.. + */ +static inline void __user * +get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size) +{ + /* Default to using normal stack */ + unsigned long sp = sigsp(regs->r1, ksig); + + return (void __user *)((sp - frame_size) & -8UL); +} + +static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, + struct pt_regs *regs) +{ + struct rt_sigframe __user *frame; + int err = 0, sig = ksig->sig; + unsigned long address = 0; +#ifdef CONFIG_MMU + pmd_t *pmdp; + pte_t *ptep; +#endif + + frame = get_sigframe(ksig, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + return -EFAULT; + + if (ksig->ka.sa.sa_flags & SA_SIGINFO) + err |= copy_siginfo_to_user(&frame->info, &ksig->info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(NULL, &frame->uc.uc_link); + err |= __save_altstack(&frame->uc.uc_stack, regs->r1); + err |= setup_sigcontext(&frame->uc.uc_mcontext, + regs, set->sig[0]); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + /* minus 8 is offset to cater for "rtsd r15,8" */ + /* addi r12, r0, __NR_sigreturn */ + err |= __put_user(0x31800000 | __NR_rt_sigreturn , + frame->tramp + 0); + /* brki r14, 0x8 */ + err |= __put_user(0xb9cc0008, frame->tramp + 1); + + /* Return from sighandler will jump to the tramp. + Negative 8 offset because return is rtsd r15, 8 */ + regs->r15 = ((unsigned long)frame->tramp)-8; + + address = ((unsigned long)frame->tramp); +#ifdef CONFIG_MMU + pmdp = pmd_offset(pud_offset( + pgd_offset(current->mm, address), + address), address); + + preempt_disable(); + ptep = pte_offset_map(pmdp, address); + if (pte_present(*ptep)) { + address = (unsigned long) page_address(pte_page(*ptep)); + /* MS: I need add offset in page */ + address += ((unsigned long)frame->tramp) & ~PAGE_MASK; + /* MS address is virtual */ + address = __virt_to_phys(address); + invalidate_icache_range(address, address + 8); + flush_dcache_range(address, address + 8); + } + pte_unmap(ptep); + preempt_enable(); +#else + flush_icache_range(address, address + 8); + flush_dcache_range(address, address + 8); +#endif + if (err) + return -EFAULT; + + /* Set up registers for signal handler */ + regs->r1 = (unsigned long) frame; + + /* Signal handler args: */ + regs->r5 = sig; /* arg 0: signum */ + regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */ + regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */ + /* Offset to handle microblaze rtid r14, 0 */ + regs->pc = (unsigned long)ksig->ka.sa.sa_handler; + +#ifdef DEBUG_SIG + pr_info("SIG deliver (%s:%d): sp=%p pc=%08lx\n", + current->comm, current->pid, frame, regs->pc); +#endif + + return 0; +} + +/* Handle restarting system calls */ +static inline void +handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) +{ + switch (regs->r3) { + case -ERESTART_RESTARTBLOCK: + case -ERESTARTNOHAND: + if (!has_handler) + goto do_restart; + regs->r3 = -EINTR; + break; + case -ERESTARTSYS: + if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { + regs->r3 = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: +do_restart: + /* offset of 4 bytes to re-execute trap (brki) instruction */ + regs->pc -= 4; + break; + } +} + +/* + * OK, we're invoking a handler + */ + +static void +handle_signal(struct ksignal *ksig, struct pt_regs *regs) +{ + sigset_t *oldset = sigmask_to_save(); + int ret; + + /* Set up the stack frame */ + ret = setup_rt_frame(ksig, oldset, regs); + + signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); +} + +/* + * Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + * + * Note that we go through the signals twice: once to check the signals that + * the kernel can handle, and then we build all the user-level signal handling + * stack-frames in one go after that. + */ +static void do_signal(struct pt_regs *regs, int in_syscall) +{ + struct ksignal ksig; + +#ifdef DEBUG_SIG + pr_info("do signal: %p %d\n", regs, in_syscall); + pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1, + regs->r12, current_thread_info()->flags); +#endif + + if (get_signal(&ksig)) { + /* Whee! Actually deliver the signal. */ + if (in_syscall) + handle_restart(regs, &ksig.ka, 1); + handle_signal(&ksig, regs); + return; + } + + if (in_syscall) + handle_restart(regs, NULL, 0); + + /* + * If there's no signal to deliver, we just put the saved sigmask + * back. + */ + restore_saved_sigmask(); +} + +asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall) +{ + if (test_thread_flag(TIF_SIGPENDING)) + do_signal(regs, in_syscall); + + if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) + tracehook_notify_resume(regs); +} diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c new file mode 100644 index 000000000..b4debe283 --- /dev/null +++ b/arch/microblaze/kernel/stacktrace.c @@ -0,0 +1,31 @@ +/* + * Stack trace support for Microblaze. + * + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/thread_info.h> +#include <linux/ptrace.h> +#include <asm/unwind.h> + +void save_stack_trace(struct stack_trace *trace) +{ + /* Exclude our helper functions from the trace*/ + trace->skip += 2; + microblaze_unwind(NULL, trace); +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + microblaze_unwind(tsk, trace); +} +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c new file mode 100644 index 000000000..ed9f34da1 --- /dev/null +++ b/arch/microblaze/kernel/sys_microblaze.c @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2007 John Williams <john.williams@petalogix.com> + * + * Copyright (C) 2006 Atmark Techno, Inc. + * Yasushi SHOJI <yashi@atmark-techno.com> + * Tetsuya OHKAWA <tetsuya@atmark-techno.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/syscalls.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/stat.h> +#include <linux/mman.h> +#include <linux/sys.h> +#include <linux/ipc.h> +#include <linux/file.h> +#include <linux/err.h> +#include <linux/fs.h> +#include <linux/semaphore.h> +#include <linux/uaccess.h> +#include <linux/unistd.h> +#include <linux/slab.h> +#include <asm/syscalls.h> + +SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, fd, + off_t, pgoff) +{ + if (pgoff & ~PAGE_MASK) + return -EINVAL; + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT); +} + +SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, fd, + unsigned long, pgoff) +{ + if (pgoff & (~PAGE_MASK >> 12)) + return -EINVAL; + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, + pgoff >> (PAGE_SHIFT - 12)); +} diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S new file mode 100644 index 000000000..6ab650593 --- /dev/null +++ b/arch/microblaze/kernel/syscall_table.S @@ -0,0 +1,404 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +ENTRY(sys_call_table) + .long sys_restart_syscall /* 0 - old "setup()" system call, + * used for restarting */ + .long sys_exit + .long sys_fork + .long sys_read + .long sys_write + .long sys_open /* 5 */ + .long sys_close + .long sys_waitpid + .long sys_creat + .long sys_link + .long sys_unlink /* 10 */ + .long sys_execve + .long sys_chdir + .long sys_time + .long sys_mknod + .long sys_chmod /* 15 */ + .long sys_lchown + .long sys_ni_syscall /* old break syscall holder */ + .long sys_ni_syscall /* old stat */ + .long sys_lseek + .long sys_getpid /* 20 */ + .long sys_mount + .long sys_oldumount + .long sys_setuid + .long sys_getuid + .long sys_stime /* 25 */ + .long sys_ptrace + .long sys_alarm + .long sys_ni_syscall /* oldfstat */ + .long sys_pause + .long sys_utime /* 30 */ + .long sys_ni_syscall /* old stty syscall holder */ + .long sys_ni_syscall /* old gtty syscall holder */ + .long sys_access + .long sys_nice + .long sys_ni_syscall /* 35 - old ftime syscall holder */ + .long sys_sync + .long sys_kill + .long sys_rename + .long sys_mkdir + .long sys_rmdir /* 40 */ + .long sys_dup + .long sys_pipe + .long sys_times + .long sys_ni_syscall /* old prof syscall holder */ + .long sys_brk /* 45 */ + .long sys_setgid + .long sys_getgid + .long sys_signal + .long sys_geteuid + .long sys_getegid /* 50 */ + .long sys_acct + .long sys_umount /* recycled never used phys() */ + .long sys_ni_syscall /* old lock syscall holder */ + .long sys_ioctl + .long sys_fcntl /* 55 */ + .long sys_ni_syscall /* old mpx syscall holder */ + .long sys_setpgid + .long sys_ni_syscall /* old ulimit syscall holder */ + .long sys_ni_syscall /* olduname */ + .long sys_umask /* 60 */ + .long sys_chroot + .long sys_ustat + .long sys_dup2 + .long sys_getppid + .long sys_getpgrp /* 65 */ + .long sys_setsid + .long sys_ni_syscall /* sys_sigaction */ + .long sys_sgetmask + .long sys_ssetmask + .long sys_setreuid /* 70 */ + .long sys_setregid + .long sys_ni_syscall /* sys_sigsuspend_wrapper */ + .long sys_sigpending + .long sys_sethostname + .long sys_setrlimit /* 75 */ + .long sys_ni_syscall /* old_getrlimit */ + .long sys_getrusage + .long sys_gettimeofday + .long sys_settimeofday + .long sys_getgroups /* 80 */ + .long sys_setgroups + .long sys_ni_syscall /* old_select */ + .long sys_symlink + .long sys_ni_syscall /* oldlstat */ + .long sys_readlink /* 85 */ + .long sys_uselib + .long sys_swapon + .long sys_reboot + .long sys_ni_syscall /* old_readdir */ + .long sys_mmap /* 90 */ /* old_mmap */ + .long sys_munmap + .long sys_truncate + .long sys_ftruncate + .long sys_fchmod + .long sys_fchown /* 95 */ + .long sys_getpriority + .long sys_setpriority + .long sys_ni_syscall /* old profil syscall holder */ + .long sys_statfs + .long sys_fstatfs /* 100 */ + .long sys_ni_syscall /* ioperm */ + .long sys_socketcall + .long sys_syslog /* operation with system console */ + .long sys_setitimer + .long sys_getitimer /* 105 */ + .long sys_newstat + .long sys_newlstat + .long sys_newfstat + .long sys_ni_syscall /* uname */ + .long sys_ni_syscall /* 110 */ /* iopl */ + .long sys_vhangup + .long sys_ni_syscall /* old "idle" system call */ + .long sys_ni_syscall /* old sys_vm86old */ + .long sys_wait4 + .long sys_swapoff /* 115 */ + .long sys_sysinfo + .long sys_ni_syscall /* old sys_ipc */ + .long sys_fsync + .long sys_ni_syscall /* sys_sigreturn_wrapper */ + .long sys_clone /* 120 */ + .long sys_setdomainname + .long sys_newuname + .long sys_ni_syscall /* modify_ldt */ + .long sys_adjtimex + .long sys_mprotect /* 125: sys_mprotect */ + .long sys_sigprocmask + .long sys_ni_syscall /* old "create_module" */ + .long sys_init_module + .long sys_delete_module + .long sys_ni_syscall /* 130: old "get_kernel_syms" */ + .long sys_quotactl + .long sys_getpgid + .long sys_fchdir + .long sys_bdflush + .long sys_sysfs /* 135 */ + .long sys_personality + .long sys_ni_syscall /* reserved for afs_syscall */ + .long sys_setfsuid + .long sys_setfsgid + .long sys_llseek /* 140 */ + .long sys_getdents + .long sys_select + .long sys_flock + .long sys_msync + .long sys_readv /* 145 */ + .long sys_writev + .long sys_getsid + .long sys_fdatasync + .long sys_sysctl + .long sys_mlock /* 150: sys_mlock */ + .long sys_munlock + .long sys_mlockall + .long sys_munlockall + .long sys_sched_setparam + .long sys_sched_getparam /* 155 */ + .long sys_sched_setscheduler + .long sys_sched_getscheduler + .long sys_sched_yield + .long sys_sched_get_priority_max + .long sys_sched_get_priority_min /* 160 */ + .long sys_sched_rr_get_interval + .long sys_nanosleep + .long sys_mremap + .long sys_setresuid + .long sys_getresuid /* 165 */ + .long sys_ni_syscall /* sys_vm86 */ + .long sys_ni_syscall /* Old sys_query_module */ + .long sys_poll + .long sys_ni_syscall /* old nfsservctl */ + .long sys_setresgid /* 170 */ + .long sys_getresgid + .long sys_prctl + .long sys_rt_sigreturn_wrapper + .long sys_rt_sigaction + .long sys_rt_sigprocmask /* 175 */ + .long sys_rt_sigpending + .long sys_rt_sigtimedwait + .long sys_rt_sigqueueinfo + .long sys_rt_sigsuspend + .long sys_pread64 /* 180 */ + .long sys_pwrite64 + .long sys_chown + .long sys_getcwd + .long sys_capget + .long sys_capset /* 185 */ + .long sys_ni_syscall /* sigaltstack */ + .long sys_sendfile + .long sys_ni_syscall /* reserved for streams1 */ + .long sys_ni_syscall /* reserved for streams2 */ + .long sys_vfork /* 190 */ + .long sys_getrlimit + .long sys_mmap2 + .long sys_truncate64 + .long sys_ftruncate64 + .long sys_stat64 /* 195 */ + .long sys_lstat64 + .long sys_fstat64 + .long sys_lchown + .long sys_getuid + .long sys_getgid /* 200 */ + .long sys_geteuid + .long sys_getegid + .long sys_setreuid + .long sys_setregid + .long sys_getgroups /* 205 */ + .long sys_setgroups + .long sys_fchown + .long sys_setresuid + .long sys_getresuid + .long sys_setresgid /* 210 */ + .long sys_getresgid + .long sys_chown + .long sys_setuid + .long sys_setgid + .long sys_setfsuid /* 215 */ + .long sys_setfsgid + .long sys_pivot_root + .long sys_mincore + .long sys_madvise + .long sys_getdents64 /* 220 */ + .long sys_fcntl64 + .long sys_ni_syscall /* reserved for TUX */ + .long sys_ni_syscall + .long sys_gettid + .long sys_readahead /* 225 */ + .long sys_setxattr + .long sys_lsetxattr + .long sys_fsetxattr + .long sys_getxattr + .long sys_lgetxattr /* 230 */ + .long sys_fgetxattr + .long sys_listxattr + .long sys_llistxattr + .long sys_flistxattr + .long sys_removexattr /* 235 */ + .long sys_lremovexattr + .long sys_fremovexattr + .long sys_tkill + .long sys_sendfile64 + .long sys_futex /* 240 */ + .long sys_sched_setaffinity + .long sys_sched_getaffinity + .long sys_ni_syscall /* set_thread_area */ + .long sys_ni_syscall /* get_thread_area */ + .long sys_io_setup /* 245 */ + .long sys_io_destroy + .long sys_io_getevents + .long sys_io_submit + .long sys_io_cancel + .long sys_fadvise64 /* 250 */ + .long sys_ni_syscall + .long sys_exit_group + .long sys_lookup_dcookie + .long sys_epoll_create + .long sys_epoll_ctl /* 255 */ + .long sys_epoll_wait + .long sys_remap_file_pages + .long sys_set_tid_address + .long sys_timer_create + .long sys_timer_settime /* 260 */ + .long sys_timer_gettime + .long sys_timer_getoverrun + .long sys_timer_delete + .long sys_clock_settime + .long sys_clock_gettime /* 265 */ + .long sys_clock_getres + .long sys_clock_nanosleep + .long sys_statfs64 + .long sys_fstatfs64 + .long sys_tgkill /* 270 */ + .long sys_utimes + .long sys_fadvise64_64 + .long sys_ni_syscall /* sys_vserver */ + .long sys_mbind + .long sys_get_mempolicy + .long sys_set_mempolicy + .long sys_mq_open + .long sys_mq_unlink + .long sys_mq_timedsend + .long sys_mq_timedreceive /* 280 */ + .long sys_mq_notify + .long sys_mq_getsetattr + .long sys_kexec_load + .long sys_waitid + .long sys_ni_syscall /* 285 */ /* available */ + .long sys_add_key + .long sys_request_key + .long sys_keyctl + .long sys_ioprio_set + .long sys_ioprio_get /* 290 */ + .long sys_inotify_init + .long sys_inotify_add_watch + .long sys_inotify_rm_watch + .long sys_ni_syscall /* sys_migrate_pages */ + .long sys_openat /* 295 */ + .long sys_mkdirat + .long sys_mknodat + .long sys_fchownat + .long sys_futimesat + .long sys_fstatat64 /* 300 */ + .long sys_unlinkat + .long sys_renameat + .long sys_linkat + .long sys_symlinkat + .long sys_readlinkat /* 305 */ + .long sys_fchmodat + .long sys_faccessat + .long sys_pselect6 + .long sys_ppoll + .long sys_unshare /* 310 */ + .long sys_set_robust_list + .long sys_get_robust_list + .long sys_splice + .long sys_sync_file_range + .long sys_tee /* 315 */ + .long sys_vmsplice + .long sys_move_pages + .long sys_getcpu + .long sys_epoll_pwait + .long sys_utimensat /* 320 */ + .long sys_signalfd + .long sys_timerfd_create + .long sys_eventfd + .long sys_fallocate + .long sys_semtimedop /* 325 */ + .long sys_timerfd_settime + .long sys_timerfd_gettime + .long sys_semctl + .long sys_semget + .long sys_semop /* 330 */ + .long sys_msgctl + .long sys_msgget + .long sys_msgrcv + .long sys_msgsnd + .long sys_shmat /* 335 */ + .long sys_shmctl + .long sys_shmdt + .long sys_shmget + .long sys_signalfd4 /* new syscall */ + .long sys_eventfd2 /* 340 */ + .long sys_epoll_create1 + .long sys_dup3 + .long sys_pipe2 + .long sys_inotify_init1 + .long sys_socket /* 345 */ + .long sys_socketpair + .long sys_bind + .long sys_listen + .long sys_accept + .long sys_connect /* 350 */ + .long sys_getsockname + .long sys_getpeername + .long sys_sendto + .long sys_send + .long sys_recvfrom /* 355 */ + .long sys_recv + .long sys_setsockopt + .long sys_getsockopt + .long sys_shutdown + .long sys_sendmsg /* 360 */ + .long sys_recvmsg + .long sys_accept4 + .long sys_preadv + .long sys_pwritev + .long sys_rt_tgsigqueueinfo /* 365 */ + .long sys_perf_event_open + .long sys_recvmmsg + .long sys_fanotify_init + .long sys_fanotify_mark + .long sys_prlimit64 /* 370 */ + .long sys_name_to_handle_at + .long sys_open_by_handle_at + .long sys_clock_adjtime + .long sys_syncfs + .long sys_setns /* 375 */ + .long sys_sendmmsg + .long sys_process_vm_readv + .long sys_process_vm_writev + .long sys_kcmp + .long sys_finit_module /* 380 */ + .long sys_sched_setattr + .long sys_sched_getattr + .long sys_renameat2 + .long sys_seccomp + .long sys_getrandom /* 385 */ + .long sys_memfd_create + .long sys_bpf + .long sys_execveat + .long sys_userfaultfd + .long sys_membarrier /* 390 */ + .long sys_mlock2 + .long sys_copy_file_range + .long sys_preadv2 + .long sys_pwritev2 + .long sys_pkey_mprotect /* 395 */ + .long sys_pkey_alloc + .long sys_pkey_free + .long sys_statx + .long sys_io_pgetevents + .long sys_rseq diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c new file mode 100644 index 000000000..a6683484b --- /dev/null +++ b/arch/microblaze/kernel/timer.c @@ -0,0 +1,332 @@ +/* + * Copyright (C) 2007-2013 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2012-2013 Xilinx, Inc. + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/sched/clock.h> +#include <linux/sched_clock.h> +#include <linux/clk.h> +#include <linux/clockchips.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/timecounter.h> +#include <asm/cpuinfo.h> + +static void __iomem *timer_baseaddr; + +static unsigned int freq_div_hz; +static unsigned int timer_clock_freq; + +#define TCSR0 (0x00) +#define TLR0 (0x04) +#define TCR0 (0x08) +#define TCSR1 (0x10) +#define TLR1 (0x14) +#define TCR1 (0x18) + +#define TCSR_MDT (1<<0) +#define TCSR_UDT (1<<1) +#define TCSR_GENT (1<<2) +#define TCSR_CAPT (1<<3) +#define TCSR_ARHT (1<<4) +#define TCSR_LOAD (1<<5) +#define TCSR_ENIT (1<<6) +#define TCSR_ENT (1<<7) +#define TCSR_TINT (1<<8) +#define TCSR_PWMA (1<<9) +#define TCSR_ENALL (1<<10) + +static unsigned int (*read_fn)(void __iomem *); +static void (*write_fn)(u32, void __iomem *); + +static void timer_write32(u32 val, void __iomem *addr) +{ + iowrite32(val, addr); +} + +static unsigned int timer_read32(void __iomem *addr) +{ + return ioread32(addr); +} + +static void timer_write32_be(u32 val, void __iomem *addr) +{ + iowrite32be(val, addr); +} + +static unsigned int timer_read32_be(void __iomem *addr) +{ + return ioread32be(addr); +} + +static inline void xilinx_timer0_stop(void) +{ + write_fn(read_fn(timer_baseaddr + TCSR0) & ~TCSR_ENT, + timer_baseaddr + TCSR0); +} + +static inline void xilinx_timer0_start_periodic(unsigned long load_val) +{ + if (!load_val) + load_val = 1; + /* loading value to timer reg */ + write_fn(load_val, timer_baseaddr + TLR0); + + /* load the initial value */ + write_fn(TCSR_LOAD, timer_baseaddr + TCSR0); + + /* see timer data sheet for detail + * !ENALL - don't enable 'em all + * !PWMA - disable pwm + * TINT - clear interrupt status + * ENT- enable timer itself + * ENIT - enable interrupt + * !LOAD - clear the bit to let go + * ARHT - auto reload + * !CAPT - no external trigger + * !GENT - no external signal + * UDT - set the timer as down counter + * !MDT0 - generate mode + */ + write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT, + timer_baseaddr + TCSR0); +} + +static inline void xilinx_timer0_start_oneshot(unsigned long load_val) +{ + if (!load_val) + load_val = 1; + /* loading value to timer reg */ + write_fn(load_val, timer_baseaddr + TLR0); + + /* load the initial value */ + write_fn(TCSR_LOAD, timer_baseaddr + TCSR0); + + write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT, + timer_baseaddr + TCSR0); +} + +static int xilinx_timer_set_next_event(unsigned long delta, + struct clock_event_device *dev) +{ + pr_debug("%s: next event, delta %x\n", __func__, (u32)delta); + xilinx_timer0_start_oneshot(delta); + return 0; +} + +static int xilinx_timer_shutdown(struct clock_event_device *evt) +{ + pr_info("%s\n", __func__); + xilinx_timer0_stop(); + return 0; +} + +static int xilinx_timer_set_periodic(struct clock_event_device *evt) +{ + pr_info("%s\n", __func__); + xilinx_timer0_start_periodic(freq_div_hz); + return 0; +} + +static struct clock_event_device clockevent_xilinx_timer = { + .name = "xilinx_clockevent", + .features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_PERIODIC, + .shift = 8, + .rating = 300, + .set_next_event = xilinx_timer_set_next_event, + .set_state_shutdown = xilinx_timer_shutdown, + .set_state_periodic = xilinx_timer_set_periodic, +}; + +static inline void timer_ack(void) +{ + write_fn(read_fn(timer_baseaddr + TCSR0), timer_baseaddr + TCSR0); +} + +static irqreturn_t timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = &clockevent_xilinx_timer; + timer_ack(); + evt->event_handler(evt); + return IRQ_HANDLED; +} + +static struct irqaction timer_irqaction = { + .handler = timer_interrupt, + .flags = IRQF_TIMER, + .name = "timer", + .dev_id = &clockevent_xilinx_timer, +}; + +static __init int xilinx_clockevent_init(void) +{ + clockevent_xilinx_timer.mult = + div_sc(timer_clock_freq, NSEC_PER_SEC, + clockevent_xilinx_timer.shift); + clockevent_xilinx_timer.max_delta_ns = + clockevent_delta2ns((u32)~0, &clockevent_xilinx_timer); + clockevent_xilinx_timer.max_delta_ticks = (u32)~0; + clockevent_xilinx_timer.min_delta_ns = + clockevent_delta2ns(1, &clockevent_xilinx_timer); + clockevent_xilinx_timer.min_delta_ticks = 1; + clockevent_xilinx_timer.cpumask = cpumask_of(0); + clockevents_register_device(&clockevent_xilinx_timer); + + return 0; +} + +static u64 xilinx_clock_read(void) +{ + return read_fn(timer_baseaddr + TCR1); +} + +static u64 xilinx_read(struct clocksource *cs) +{ + /* reading actual value of timer 1 */ + return (u64)xilinx_clock_read(); +} + +static struct timecounter xilinx_tc = { + .cc = NULL, +}; + +static u64 xilinx_cc_read(const struct cyclecounter *cc) +{ + return xilinx_read(NULL); +} + +static struct cyclecounter xilinx_cc = { + .read = xilinx_cc_read, + .mask = CLOCKSOURCE_MASK(32), + .shift = 8, +}; + +static int __init init_xilinx_timecounter(void) +{ + xilinx_cc.mult = div_sc(timer_clock_freq, NSEC_PER_SEC, + xilinx_cc.shift); + + timecounter_init(&xilinx_tc, &xilinx_cc, sched_clock()); + + return 0; +} + +static struct clocksource clocksource_microblaze = { + .name = "xilinx_clocksource", + .rating = 300, + .read = xilinx_read, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static int __init xilinx_clocksource_init(void) +{ + int ret; + + ret = clocksource_register_hz(&clocksource_microblaze, + timer_clock_freq); + if (ret) { + pr_err("failed to register clocksource"); + return ret; + } + + /* stop timer1 */ + write_fn(read_fn(timer_baseaddr + TCSR1) & ~TCSR_ENT, + timer_baseaddr + TCSR1); + /* start timer1 - up counting without interrupt */ + write_fn(TCSR_TINT|TCSR_ENT|TCSR_ARHT, timer_baseaddr + TCSR1); + + /* register timecounter - for ftrace support */ + return init_xilinx_timecounter(); +} + +static int __init xilinx_timer_init(struct device_node *timer) +{ + struct clk *clk; + static int initialized; + u32 irq; + u32 timer_num = 1; + int ret; + + if (initialized) + return -EINVAL; + + initialized = 1; + + timer_baseaddr = of_iomap(timer, 0); + if (!timer_baseaddr) { + pr_err("ERROR: invalid timer base address\n"); + return -ENXIO; + } + + write_fn = timer_write32; + read_fn = timer_read32; + + write_fn(TCSR_MDT, timer_baseaddr + TCSR0); + if (!(read_fn(timer_baseaddr + TCSR0) & TCSR_MDT)) { + write_fn = timer_write32_be; + read_fn = timer_read32_be; + } + + irq = irq_of_parse_and_map(timer, 0); + if (irq <= 0) { + pr_err("Failed to parse and map irq"); + return -EINVAL; + } + + of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num); + if (timer_num) { + pr_err("Please enable two timers in HW\n"); + return -EINVAL; + } + + pr_info("%pOF: irq=%d\n", timer, irq); + + clk = of_clk_get(timer, 0); + if (IS_ERR(clk)) { + pr_err("ERROR: timer CCF input clock not found\n"); + /* If there is clock-frequency property than use it */ + of_property_read_u32(timer, "clock-frequency", + &timer_clock_freq); + } else { + timer_clock_freq = clk_get_rate(clk); + } + + if (!timer_clock_freq) { + pr_err("ERROR: Using CPU clock frequency\n"); + timer_clock_freq = cpuinfo.cpu_clock_freq; + } + + freq_div_hz = timer_clock_freq / HZ; + + ret = setup_irq(irq, &timer_irqaction); + if (ret) { + pr_err("Failed to setup IRQ"); + return ret; + } + + ret = xilinx_clocksource_init(); + if (ret) + return ret; + + ret = xilinx_clockevent_init(); + if (ret) + return ret; + + sched_clock_register(xilinx_clock_read, 32, timer_clock_freq); + + return 0; +} + +TIMER_OF_DECLARE(xilinx_timer, "xlnx,xps-timer-1.00.a", + xilinx_timer_init); diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c new file mode 100644 index 000000000..45bbba9d9 --- /dev/null +++ b/arch/microblaze/kernel/traps.c @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/kallsyms.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/debug_locks.h> + +#include <asm/exceptions.h> +#include <asm/unwind.h> + +void trap_init(void) +{ + __enable_hw_exceptions(); +} + +static unsigned long kstack_depth_to_print; /* 0 == entire stack */ + +static int __init kstack_setup(char *s) +{ + return !kstrtoul(s, 0, &kstack_depth_to_print); +} +__setup("kstack=", kstack_setup); + +void show_stack(struct task_struct *task, unsigned long *sp) +{ + unsigned long words_to_show; + u32 fp = (u32) sp; + + if (fp == 0) { + if (task) { + fp = ((struct thread_info *) + (task->stack))->cpu_context.r1; + } else { + /* Pick up caller of dump_stack() */ + fp = (u32)&sp - 8; + } + } + + words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2; + if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print)) + words_to_show = kstack_depth_to_print; + + pr_info("Kernel Stack:\n"); + + /* + * Make the first line an 'odd' size if necessary to get + * remaining lines to start at an address multiple of 0x10 + */ + if (fp & 0xF) { + unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2; + if (line1_words < words_to_show) { + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, + 4, (void *)fp, line1_words << 2, 0); + fp += line1_words << 2; + words_to_show -= line1_words; + } + } + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp, + words_to_show << 2, 0); + pr_info("\n\nCall Trace:\n"); + microblaze_unwind(task, NULL); + pr_info("\n"); + + if (!task) + task = current; + + debug_show_held_locks(task); +} diff --git a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c new file mode 100644 index 000000000..34c270cb1 --- /dev/null +++ b/arch/microblaze/kernel/unwind.c @@ -0,0 +1,320 @@ +/* + * Backtrace support for Microblaze + * + * Copyright (C) 2010 Digital Design Corporation + * + * Based on arch/sh/kernel/cpu/sh5/unwind.c code which is: + * Copyright (C) 2004 Paul Mundt + * Copyright (C) 2004 Richard Curnow + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +/* #define DEBUG 1 */ +#include <linux/export.h> +#include <linux/kallsyms.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/sched/task_stack.h> +#include <linux/stacktrace.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <asm/sections.h> +#include <asm/exceptions.h> +#include <asm/unwind.h> +#include <asm/switch_to.h> + +struct stack_trace; + +/* + * On Microblaze, finding the previous stack frame is a little tricky. + * At this writing (3/2010), Microblaze does not support CONFIG_FRAME_POINTERS, + * and even if it did, gcc (4.1.2) does not store the frame pointer at + * a consistent offset within each frame. To determine frame size, it is + * necessary to search for the assembly instruction that creates or reclaims + * the frame and extract the size from it. + * + * Microblaze stores the stack pointer in r1, and creates a frame via + * + * addik r1, r1, -FRAME_SIZE + * + * The frame is reclaimed via + * + * addik r1, r1, FRAME_SIZE + * + * Frame creation occurs at or near the top of a function. + * Depending on the compiler, reclaim may occur at the end, or before + * a mid-function return. + * + * A stack frame is usually not created in a leaf function. + * + */ + +/** + * get_frame_size - Extract the stack adjustment from an + * "addik r1, r1, adjust" instruction + * @instr : Microblaze instruction + * + * Return - Number of stack bytes the instruction reserves or reclaims + */ +static inline long get_frame_size(unsigned long instr) +{ + return abs((s16)(instr & 0xFFFF)); +} + +/** + * find_frame_creation - Search backward to find the instruction that creates + * the stack frame (hopefully, for the same function the + * initial PC is in). + * @pc : Program counter at which to begin the search + * + * Return - PC at which stack frame creation occurs + * NULL if this cannot be found, i.e. a leaf function + */ +static unsigned long *find_frame_creation(unsigned long *pc) +{ + int i; + + /* NOTE: Distance to search is arbitrary + * 250 works well for most things, + * 750 picks up things like tcp_recvmsg(), + * 1000 needed for fat_fill_super() + */ + for (i = 0; i < 1000; i++, pc--) { + unsigned long instr; + s16 frame_size; + + if (!kernel_text_address((unsigned long) pc)) + return NULL; + + instr = *pc; + + /* addik r1, r1, foo ? */ + if ((instr & 0xFFFF0000) != 0x30210000) + continue; /* No */ + + frame_size = get_frame_size(instr); + if ((frame_size < 8) || (frame_size & 3)) { + pr_debug(" Invalid frame size %d at 0x%p\n", + frame_size, pc); + return NULL; + } + + pr_debug(" Found frame creation at 0x%p, size %d\n", pc, + frame_size); + return pc; + } + + return NULL; +} + +/** + * lookup_prev_stack_frame - Find the stack frame of the previous function. + * @fp : Frame (stack) pointer for current function + * @pc : Program counter within current function + * @leaf_return : r15 value within current function. If the current function + * is a leaf, this is the caller's return address. + * @pprev_fp : On exit, set to frame (stack) pointer for previous function + * @pprev_pc : On exit, set to current function caller's return address + * + * Return - 0 on success, -EINVAL if the previous frame cannot be found + */ +static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc, + unsigned long leaf_return, + unsigned long *pprev_fp, + unsigned long *pprev_pc) +{ + unsigned long *prologue = NULL; + + /* _switch_to is a special leaf function */ + if (pc != (unsigned long) &_switch_to) + prologue = find_frame_creation((unsigned long *)pc); + + if (prologue) { + long frame_size = get_frame_size(*prologue); + + *pprev_fp = fp + frame_size; + *pprev_pc = *(unsigned long *)fp; + } else { + if (!leaf_return) + return -EINVAL; + *pprev_pc = leaf_return; + *pprev_fp = fp; + } + + /* NOTE: don't check kernel_text_address here, to allow display + * of userland return address + */ + return (!*pprev_pc || (*pprev_pc & 3)) ? -EINVAL : 0; +} + +static void microblaze_unwind_inner(struct task_struct *task, + unsigned long pc, unsigned long fp, + unsigned long leaf_return, + struct stack_trace *trace); + +/** + * unwind_trap - Unwind through a system trap, that stored previous state + * on the stack. + */ +#ifdef CONFIG_MMU +static inline void unwind_trap(struct task_struct *task, unsigned long pc, + unsigned long fp, struct stack_trace *trace) +{ + /* To be implemented */ +} +#else +static inline void unwind_trap(struct task_struct *task, unsigned long pc, + unsigned long fp, struct stack_trace *trace) +{ + const struct pt_regs *regs = (const struct pt_regs *) fp; + microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace); +} +#endif + +/** + * microblaze_unwind_inner - Unwind the stack from the specified point + * @task : Task whose stack we are to unwind (may be NULL) + * @pc : Program counter from which we start unwinding + * @fp : Frame (stack) pointer from which we start unwinding + * @leaf_return : Value of r15 at pc. If the function is a leaf, this is + * the caller's return address. + * @trace : Where to store stack backtrace (PC values). + * NULL == print backtrace to kernel log + */ +static void microblaze_unwind_inner(struct task_struct *task, + unsigned long pc, unsigned long fp, + unsigned long leaf_return, + struct stack_trace *trace) +{ + int ofs = 0; + + pr_debug(" Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp); + if (!pc || !fp || (pc & 3) || (fp & 3)) { + pr_debug(" Invalid state for unwind, aborting\n"); + return; + } + for (; pc != 0;) { + unsigned long next_fp, next_pc = 0; + unsigned long return_to = pc + 2 * sizeof(unsigned long); + const struct trap_handler_info *handler = + µblaze_trap_handlers; + + /* Is previous function the HW exception handler? */ + if ((return_to >= (unsigned long)&_hw_exception_handler) + &&(return_to < (unsigned long)&ex_handler_unhandled)) { + /* + * HW exception handler doesn't save all registers, + * so we open-code a special case of unwind_trap() + */ +#ifndef CONFIG_MMU + const struct pt_regs *regs = + (const struct pt_regs *) fp; +#endif + pr_info("HW EXCEPTION\n"); +#ifndef CONFIG_MMU + microblaze_unwind_inner(task, regs->r17 - 4, + fp + EX_HANDLER_STACK_SIZ, + regs->r15, trace); +#endif + return; + } + + /* Is previous function a trap handler? */ + for (; handler->start_addr; ++handler) { + if ((return_to >= handler->start_addr) + && (return_to <= handler->end_addr)) { + if (!trace) + pr_info("%s\n", handler->trap_name); + unwind_trap(task, pc, fp, trace); + return; + } + } + pc -= ofs; + + if (trace) { +#ifdef CONFIG_STACKTRACE + if (trace->skip > 0) + trace->skip--; + else + trace->entries[trace->nr_entries++] = pc; + + if (trace->nr_entries >= trace->max_entries) + break; +#endif + } else { + /* Have we reached userland? */ + if (unlikely(pc == task_pt_regs(task)->pc)) { + pr_info("[<%p>] PID %lu [%s]\n", + (void *) pc, + (unsigned long) task->pid, + task->comm); + break; + } else + print_ip_sym(pc); + } + + /* Stop when we reach anything not part of the kernel */ + if (!kernel_text_address(pc)) + break; + + if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp, + &next_pc) == 0) { + ofs = sizeof(unsigned long); + pc = next_pc & ~3; + fp = next_fp; + leaf_return = 0; + } else { + pr_debug(" Failed to find previous stack frame\n"); + break; + } + + pr_debug(" Next PC=%p, next FP=%p\n", + (void *)next_pc, (void *)next_fp); + } +} + +/** + * microblaze_unwind - Stack unwinder for Microblaze (external entry point) + * @task : Task whose stack we are to unwind (NULL == current) + * @trace : Where to store stack backtrace (PC values). + * NULL == print backtrace to kernel log + */ +void microblaze_unwind(struct task_struct *task, struct stack_trace *trace) +{ + if (task) { + if (task == current) { + const struct pt_regs *regs = task_pt_regs(task); + microblaze_unwind_inner(task, regs->pc, regs->r1, + regs->r15, trace); + } else { + struct thread_info *thread_info = + (struct thread_info *)(task->stack); + const struct cpu_context *cpu_context = + &thread_info->cpu_context; + + microblaze_unwind_inner(task, + (unsigned long) &_switch_to, + cpu_context->r1, + cpu_context->r15, trace); + } + } else { + unsigned long pc, fp; + + __asm__ __volatile__ ("or %0, r1, r0" : "=r" (fp)); + + __asm__ __volatile__ ( + "brlid %0, 0f;" + "nop;" + "0:" + : "=r" (pc) + ); + + /* Since we are not a leaf function, use leaf_return = 0 */ + microblaze_unwind_inner(current, pc, fp, 0, trace); + } +} + diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S new file mode 100644 index 000000000..289d0e7f3 --- /dev/null +++ b/arch/microblaze/kernel/vmlinux.lds.S @@ -0,0 +1,142 @@ +/* + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +OUTPUT_ARCH(microblaze) +ENTRY(microblaze_start) + +#include <asm/page.h> +#include <asm-generic/vmlinux.lds.h> +#include <asm/thread_info.h> + +#ifdef __MICROBLAZEEL__ +jiffies = jiffies_64; +#else +jiffies = jiffies_64 + 4; +#endif + +SECTIONS { + . = CONFIG_KERNEL_START; + microblaze_start = CONFIG_KERNEL_BASE_ADDR; + .text : AT(ADDR(.text) - LOAD_OFFSET) { + _text = . ; + _stext = . ; + HEAD_TEXT + TEXT_TEXT + *(.fixup) + EXIT_TEXT + EXIT_CALL + SCHED_TEXT + CPUIDLE_TEXT + LOCK_TEXT + KPROBES_TEXT + IRQENTRY_TEXT + SOFTIRQENTRY_TEXT + . = ALIGN (4) ; + _etext = . ; + } + + . = ALIGN (4) ; + __fdt_blob : AT(ADDR(__fdt_blob) - LOAD_OFFSET) { + _fdt_start = . ; /* place for fdt blob */ + *(__fdt_blob) ; /* Any link-placed DTB */ + . = _fdt_start + 0x8000; /* Pad up to 32kbyte */ + _fdt_end = . ; + } + + . = ALIGN(16); + RODATA + EXCEPTION_TABLE(16) + NOTES + + /* + * sdata2 section can go anywhere, but must be word aligned + * and SDA2_BASE must point to the middle of it + */ + .sdata2 : AT(ADDR(.sdata2) - LOAD_OFFSET) { + _ssrw = .; + . = ALIGN(PAGE_SIZE); /* page aligned when MMU used */ + *(.sdata2) + . = ALIGN(8); + _essrw = .; + _ssrw_size = _essrw - _ssrw; + _KERNEL_SDA2_BASE_ = _ssrw + (_ssrw_size / 2); + } + + _sdata = . ; + RW_DATA_SECTION(32, PAGE_SIZE, THREAD_SIZE) + _edata = . ; + + /* Under the microblaze ABI, .sdata and .sbss must be contiguous */ + . = ALIGN(8); + .sdata : AT(ADDR(.sdata) - LOAD_OFFSET) { + _ssro = .; + *(.sdata) + } + + .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { + _ssbss = .; + *(.sbss) + _esbss = .; + _essro = .; + _ssro_size = _essro - _ssro ; + _KERNEL_SDA_BASE_ = _ssro + (_ssro_size / 2) ; + } + + . = ALIGN(PAGE_SIZE); + __init_begin = .; + + INIT_TEXT_SECTION(PAGE_SIZE) + + .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { + INIT_DATA + } + + . = ALIGN(4); + .init.ivt : AT(ADDR(.init.ivt) - LOAD_OFFSET) { + __ivt_start = .; + *(.init.ivt) + __ivt_end = .; + } + + .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { + INIT_SETUP(0) + } + + .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET ) { + INIT_CALLS + } + + .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) { + CON_INITCALL + } + + SECURITY_INIT + + __init_end_before_initramfs = .; + + .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { + INIT_RAM_FS + } + + __init_end = .; + + .bss ALIGN (PAGE_SIZE) : AT(ADDR(.bss) - LOAD_OFFSET) { + /* page aligned when MMU used */ + __bss_start = . ; + *(.bss*) + *(COMMON) + . = ALIGN (4) ; + __bss_stop = . ; + } + . = ALIGN(PAGE_SIZE); + _end = .; + + DISCARDS +} |