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Diffstat (limited to 'arch/sh/include/asm/processor_32.h')
| -rw-r--r-- | arch/sh/include/asm/processor_32.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h new file mode 100644 index 000000000..3ef7adf73 --- /dev/null +++ b/arch/sh/include/asm/processor_32.h @@ -0,0 +1,203 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * include/asm-sh/processor.h + * + * Copyright (C) 1999, 2000 Niibe Yutaka + * Copyright (C) 2002, 2003 Paul Mundt + */ + +#ifndef __ASM_SH_PROCESSOR_32_H +#define __ASM_SH_PROCESSOR_32_H + +#include <linux/compiler.h> +#include <linux/linkage.h> +#include <asm/page.h> +#include <asm/types.h> +#include <asm/hw_breakpoint.h> + +/* Core Processor Version Register */ +#define CCN_PVR 0xff000030 +#define CCN_CVR 0xff000040 +#define CCN_PRR 0xff000044 + +/* + * User space process size: 2GB. + * + * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff + */ +#define TASK_SIZE 0x7c000000UL + +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX STACK_TOP + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) + +/* + * Bit of SR register + * + * FD-bit: + * When it's set, it means the processor doesn't have right to use FPU, + * and it results exception when the floating operation is executed. + * + * IMASK-bit: + * Interrupt level mask + */ +#define SR_DSP 0x00001000 +#define SR_IMASK 0x000000f0 +#define SR_FD 0x00008000 +#define SR_MD 0x40000000 + +#define SR_USER_MASK 0x00000303 // M, Q, S, T bits +/* + * DSP structure and data + */ +struct sh_dsp_struct { + unsigned long dsp_regs[14]; + long status; +}; + +/* + * FPU structure and data + */ + +struct sh_fpu_hard_struct { + unsigned long fp_regs[16]; + unsigned long xfp_regs[16]; + unsigned long fpscr; + unsigned long fpul; + + long status; /* software status information */ +}; + +/* Dummy fpu emulator */ +struct sh_fpu_soft_struct { + unsigned long fp_regs[16]; + unsigned long xfp_regs[16]; + unsigned long fpscr; + unsigned long fpul; + + unsigned char lookahead; + unsigned long entry_pc; +}; + +union thread_xstate { + struct sh_fpu_hard_struct hardfpu; + struct sh_fpu_soft_struct softfpu; +}; + +struct thread_struct { + /* Saved registers when thread is descheduled */ + unsigned long sp; + unsigned long pc; + + /* Various thread flags, see SH_THREAD_xxx */ + unsigned long flags; + + /* Save middle states of ptrace breakpoints */ + struct perf_event *ptrace_bps[HBP_NUM]; + +#ifdef CONFIG_SH_DSP + /* Dsp status information */ + struct sh_dsp_struct dsp_status; +#endif + + /* Extended processor state */ + union thread_xstate *xstate; + + /* + * fpu_counter contains the number of consecutive context switches + * that the FPU is used. If this is over a threshold, the lazy fpu + * saving becomes unlazy to save the trap. This is an unsigned char + * so that after 256 times the counter wraps and the behavior turns + * lazy again; this to deal with bursty apps that only use FPU for + * a short time + */ + unsigned char fpu_counter; +}; + +#define INIT_THREAD { \ + .sp = sizeof(init_stack) + (long) &init_stack, \ + .flags = 0, \ +} + +/* Forward declaration, a strange C thing */ +struct task_struct; + +extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp); + +/* + * FPU lazy state save handling. + */ + +static __inline__ void disable_fpu(void) +{ + unsigned long __dummy; + + /* Set FD flag in SR */ + __asm__ __volatile__("stc sr, %0\n\t" + "or %1, %0\n\t" + "ldc %0, sr" + : "=&r" (__dummy) + : "r" (SR_FD)); +} + +static __inline__ void enable_fpu(void) +{ + unsigned long __dummy; + + /* Clear out FD flag in SR */ + __asm__ __volatile__("stc sr, %0\n\t" + "and %1, %0\n\t" + "ldc %0, sr" + : "=&r" (__dummy) + : "r" (~SR_FD)); +} + +/* Double presision, NANS as NANS, rounding to nearest, no exceptions */ +#define FPSCR_INIT 0x00080000 + +#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ +#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ + +/* + * Return saved PC of a blocked thread. + */ +#define thread_saved_pc(tsk) (tsk->thread.pc) + +void show_trace(struct task_struct *tsk, unsigned long *sp, + struct pt_regs *regs, const char *loglvl); + +#ifdef CONFIG_DUMP_CODE +void show_code(struct pt_regs *regs); +#else +static inline void show_code(struct pt_regs *regs) +{ +} +#endif + +extern unsigned long __get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) +#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) + +#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4) + +#define PREFETCH_STRIDE L1_CACHE_BYTES +#define ARCH_HAS_PREFETCH +#define ARCH_HAS_PREFETCHW + +static inline void prefetch(const void *x) +{ + __builtin_prefetch(x, 0, 3); +} + +static inline void prefetchw(const void *x) +{ + __builtin_prefetch(x, 1, 3); +} +#endif + +#endif /* __ASM_SH_PROCESSOR_32_H */ |