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-rw-r--r--arch/mips/include/asm/processor.h439
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diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
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+++ b/arch/mips/include/asm/processor.h
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+/*
+ * 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.
+ *
+ * Copyright (C) 1994 Waldorf GMBH
+ * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
+ * Copyright (C) 1996 Paul M. Antoine
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_PROCESSOR_H
+#define _ASM_PROCESSOR_H
+
+#include <linux/atomic.h>
+#include <linux/cpumask.h>
+#include <linux/sizes.h>
+#include <linux/threads.h>
+
+#include <asm/cachectl.h>
+#include <asm/cpu.h>
+#include <asm/cpu-info.h>
+#include <asm/dsemul.h>
+#include <asm/mipsregs.h>
+#include <asm/prefetch.h>
+
+/*
+ * Return current * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+/*
+ * System setup and hardware flags..
+ */
+
+extern unsigned int vced_count, vcei_count;
+
+/*
+ * MIPS does have an arch_pick_mmap_layout()
+ */
+#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
+
+#ifdef CONFIG_32BIT
+#ifdef CONFIG_KVM_GUEST
+/* User space process size is limited to 1GB in KVM Guest Mode */
+#define TASK_SIZE 0x3fff8000UL
+#else
+/*
+ * User space process size: 2GB. This is hardcoded into a few places,
+ * so don't change it unless you know what you are doing.
+ */
+#define TASK_SIZE 0x80000000UL
+#endif
+
+#define STACK_TOP_MAX TASK_SIZE
+
+#define TASK_IS_32BIT_ADDR 1
+
+#endif
+
+#ifdef CONFIG_64BIT
+/*
+ * User space process size: 1TB. This is hardcoded into a few places,
+ * so don't change it unless you know what you are doing. TASK_SIZE
+ * is limited to 1TB by the R4000 architecture; R10000 and better can
+ * support 16TB; the architectural reserve for future expansion is
+ * 8192EB ...
+ */
+#define TASK_SIZE32 0x7fff8000UL
+#ifdef CONFIG_MIPS_VA_BITS_48
+#define TASK_SIZE64 (0x1UL << ((cpu_data[0].vmbits>48)?48:cpu_data[0].vmbits))
+#else
+#define TASK_SIZE64 0x10000000000UL
+#endif
+#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
+#define STACK_TOP_MAX TASK_SIZE64
+
+#define TASK_SIZE_OF(tsk) \
+ (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
+
+#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
+
+#endif
+
+#define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)
+
+extern unsigned long mips_stack_top(void);
+#define STACK_TOP mips_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)
+
+
+#define NUM_FPU_REGS 32
+
+#ifdef CONFIG_CPU_HAS_MSA
+# define FPU_REG_WIDTH 128
+#else
+# define FPU_REG_WIDTH 64
+#endif
+
+union fpureg {
+ __u32 val32[FPU_REG_WIDTH / 32];
+ __u64 val64[FPU_REG_WIDTH / 64];
+};
+
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+# define FPR_IDX(width, idx) (idx)
+#else
+# define FPR_IDX(width, idx) ((idx) ^ ((64 / (width)) - 1))
+#endif
+
+#define BUILD_FPR_ACCESS(width) \
+static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx) \
+{ \
+ return fpr->val##width[FPR_IDX(width, idx)]; \
+} \
+ \
+static inline void set_fpr##width(union fpureg *fpr, unsigned idx, \
+ u##width val) \
+{ \
+ fpr->val##width[FPR_IDX(width, idx)] = val; \
+}
+
+BUILD_FPR_ACCESS(32)
+BUILD_FPR_ACCESS(64)
+
+/*
+ * It would be nice to add some more fields for emulator statistics,
+ * the additional information is private to the FPU emulator for now.
+ * See arch/mips/include/asm/fpu_emulator.h.
+ */
+
+struct mips_fpu_struct {
+ union fpureg fpr[NUM_FPU_REGS];
+ unsigned int fcr31;
+ unsigned int msacsr;
+};
+
+#define NUM_DSP_REGS 6
+
+typedef unsigned long dspreg_t;
+
+struct mips_dsp_state {
+ dspreg_t dspr[NUM_DSP_REGS];
+ unsigned int dspcontrol;
+};
+
+#define INIT_CPUMASK { \
+ {0,} \
+}
+
+struct mips3264_watch_reg_state {
+ /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
+ 64 bit kernel. We use unsigned long as it has the same
+ property. */
+ unsigned long watchlo[NUM_WATCH_REGS];
+ /* Only the mask and IRW bits from watchhi. */
+ u16 watchhi[NUM_WATCH_REGS];
+};
+
+union mips_watch_reg_state {
+ struct mips3264_watch_reg_state mips3264;
+};
+
+#if defined(CONFIG_CPU_CAVIUM_OCTEON)
+
+struct octeon_cop2_state {
+ /* DMFC2 rt, 0x0201 */
+ unsigned long cop2_crc_iv;
+ /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
+ unsigned long cop2_crc_length;
+ /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
+ unsigned long cop2_crc_poly;
+ /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
+ unsigned long cop2_llm_dat[2];
+ /* DMFC2 rt, 0x0084 */
+ unsigned long cop2_3des_iv;
+ /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
+ unsigned long cop2_3des_key[3];
+ /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
+ unsigned long cop2_3des_result;
+ /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
+ unsigned long cop2_aes_inp0;
+ /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
+ unsigned long cop2_aes_iv[2];
+ /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
+ * rt, 0x0107 */
+ unsigned long cop2_aes_key[4];
+ /* DMFC2 rt, 0x0110 */
+ unsigned long cop2_aes_keylen;
+ /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
+ unsigned long cop2_aes_result[2];
+ /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
+ * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
+ * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
+ * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
+ * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
+ unsigned long cop2_hsh_datw[15];
+ /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
+ * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
+ * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
+ unsigned long cop2_hsh_ivw[8];
+ /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
+ unsigned long cop2_gfm_mult[2];
+ /* DMFC2 rt, 0x025E - Pass2 */
+ unsigned long cop2_gfm_poly;
+ /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
+ unsigned long cop2_gfm_result[2];
+ /* DMFC2 rt, 0x24F, DMFC2 rt, 0x50, OCTEON III */
+ unsigned long cop2_sha3[2];
+};
+#define COP2_INIT \
+ .cp2 = {0,},
+
+struct octeon_cvmseg_state {
+ unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
+ [cpu_dcache_line_size() / sizeof(unsigned long)];
+};
+
+#elif defined(CONFIG_CPU_XLP)
+struct nlm_cop2_state {
+ u64 rx[4];
+ u64 tx[4];
+ u32 tx_msg_status;
+ u32 rx_msg_status;
+};
+
+#define COP2_INIT \
+ .cp2 = {{0}, {0}, 0, 0},
+#else
+#define COP2_INIT
+#endif
+
+typedef struct {
+ unsigned long seg;
+} mm_segment_t;
+
+#ifdef CONFIG_CPU_HAS_MSA
+# define ARCH_MIN_TASKALIGN 16
+# define FPU_ALIGN __aligned(16)
+#else
+# define ARCH_MIN_TASKALIGN 8
+# define FPU_ALIGN
+#endif
+
+struct mips_abi;
+
+/*
+ * If you change thread_struct remember to change the #defines below too!
+ */
+struct thread_struct {
+ /* Saved main processor registers. */
+ unsigned long reg16;
+ unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
+ unsigned long reg29, reg30, reg31;
+
+ /* Saved cp0 stuff. */
+ unsigned long cp0_status;
+
+ /* Saved fpu/fpu emulator stuff. */
+ struct mips_fpu_struct fpu FPU_ALIGN;
+ /* Assigned branch delay slot 'emulation' frame */
+ atomic_t bd_emu_frame;
+ /* PC of the branch from a branch delay slot 'emulation' */
+ unsigned long bd_emu_branch_pc;
+ /* PC to continue from following a branch delay slot 'emulation' */
+ unsigned long bd_emu_cont_pc;
+#ifdef CONFIG_MIPS_MT_FPAFF
+ /* Emulated instruction count */
+ unsigned long emulated_fp;
+ /* Saved per-thread scheduler affinity mask */
+ cpumask_t user_cpus_allowed;
+#endif /* CONFIG_MIPS_MT_FPAFF */
+
+ /* Saved state of the DSP ASE, if available. */
+ struct mips_dsp_state dsp;
+
+ /* Saved watch register state, if available. */
+ union mips_watch_reg_state watch;
+
+ /* Other stuff associated with the thread. */
+ unsigned long cp0_badvaddr; /* Last user fault */
+ unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
+ unsigned long error_code;
+ unsigned long trap_nr;
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
+ struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
+#endif
+#ifdef CONFIG_CPU_XLP
+ struct nlm_cop2_state cp2;
+#endif
+ struct mips_abi *abi;
+};
+
+#ifdef CONFIG_MIPS_MT_FPAFF
+#define FPAFF_INIT \
+ .emulated_fp = 0, \
+ .user_cpus_allowed = INIT_CPUMASK,
+#else
+#define FPAFF_INIT
+#endif /* CONFIG_MIPS_MT_FPAFF */
+
+#define INIT_THREAD { \
+ /* \
+ * Saved main processor registers \
+ */ \
+ .reg16 = 0, \
+ .reg17 = 0, \
+ .reg18 = 0, \
+ .reg19 = 0, \
+ .reg20 = 0, \
+ .reg21 = 0, \
+ .reg22 = 0, \
+ .reg23 = 0, \
+ .reg29 = 0, \
+ .reg30 = 0, \
+ .reg31 = 0, \
+ /* \
+ * Saved cp0 stuff \
+ */ \
+ .cp0_status = 0, \
+ /* \
+ * Saved FPU/FPU emulator stuff \
+ */ \
+ .fpu = { \
+ .fpr = {{{0,},},}, \
+ .fcr31 = 0, \
+ .msacsr = 0, \
+ }, \
+ /* \
+ * FPU affinity state (null if not FPAFF) \
+ */ \
+ FPAFF_INIT \
+ /* Delay slot emulation */ \
+ .bd_emu_frame = ATOMIC_INIT(BD_EMUFRAME_NONE), \
+ .bd_emu_branch_pc = 0, \
+ .bd_emu_cont_pc = 0, \
+ /* \
+ * Saved DSP stuff \
+ */ \
+ .dsp = { \
+ .dspr = {0, }, \
+ .dspcontrol = 0, \
+ }, \
+ /* \
+ * saved watch register stuff \
+ */ \
+ .watch = {{{0,},},}, \
+ /* \
+ * Other stuff associated with the process \
+ */ \
+ .cp0_badvaddr = 0, \
+ .cp0_baduaddr = 0, \
+ .error_code = 0, \
+ .trap_nr = 0, \
+ /* \
+ * Platform specific cop2 registers(null if no COP2) \
+ */ \
+ COP2_INIT \
+}
+
+struct task_struct;
+
+/* Free all resources held by a thread. */
+#define release_thread(thread) do { } while(0)
+
+/*
+ * Do necessary setup to start up a newly executed thread.
+ */
+extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
+
+static inline void flush_thread(void)
+{
+}
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
+ THREAD_SIZE - 32 - sizeof(struct pt_regs))
+#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
+#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
+#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
+#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
+
+#ifdef CONFIG_CPU_LOONGSON3
+/*
+ * Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
+ * tight read loop is executed, because reads take priority over writes & the
+ * hardware (incorrectly) doesn't ensure that writes will eventually occur.
+ *
+ * Since spin loops of any kind should have a cpu_relax() in them, force an SFB
+ * flush from cpu_relax() such that any pending writes will become visible as
+ * expected.
+ */
+#define cpu_relax() smp_mb()
+#else
+#define cpu_relax() barrier()
+#endif
+
+/*
+ * Return_address is a replacement for __builtin_return_address(count)
+ * which on certain architectures cannot reasonably be implemented in GCC
+ * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
+ * Note that __builtin_return_address(x>=1) is forbidden because GCC
+ * aborts compilation on some CPUs. It's simply not possible to unwind
+ * some CPU's stackframes.
+ *
+ * __builtin_return_address works only for non-leaf functions. We avoid the
+ * overhead of a function call by forcing the compiler to save the return
+ * address register on the stack.
+ */
+#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
+
+#ifdef CONFIG_CPU_HAS_PREFETCH
+
+#define ARCH_HAS_PREFETCH
+#define prefetch(x) __builtin_prefetch((x), 0, 1)
+
+#define ARCH_HAS_PREFETCHW
+#define prefetchw(x) __builtin_prefetch((x), 1, 1)
+
+#endif
+
+/*
+ * Functions & macros implementing the PR_GET_FP_MODE & PR_SET_FP_MODE options
+ * to the prctl syscall.
+ */
+extern int mips_get_process_fp_mode(struct task_struct *task);
+extern int mips_set_process_fp_mode(struct task_struct *task,
+ unsigned int value);
+
+#define GET_FP_MODE(task) mips_get_process_fp_mode(task)
+#define SET_FP_MODE(task,value) mips_set_process_fp_mode(task, value)
+
+#endif /* _ASM_PROCESSOR_H */
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