arch/sh/include/asm/processor_32.h

   1 /*
   2  * include/asm-sh/processor.h
   3  *
   4  * Copyright (C) 1999, 2000  Niibe Yutaka
   5  * Copyright (C) 2002, 2003  Paul Mundt
   6  */
   7
   8 #ifndef __ASM_SH_PROCESSOR_32_H
   9 #define __ASM_SH_PROCESSOR_32_H
  10 #ifdef __KERNEL__
  11
  12 #include <linux/compiler.h>
  13 #include <linux/linkage.h>
  14 #include <asm/page.h>
  15 #include <asm/types.h>
  16 #include <asm/hw_breakpoint.h>
  17
  18 /*
  19  * Default implementation of macro that returns current
  20  * instruction pointer ("program counter").
  21  */
  22 #define current_text_addr() ({ void *pc; __asm__("mova  1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
  23
  24 /* Core Processor Version Register */
  25 #define CCN_PVR         0xff000030
  26 #define CCN_CVR         0xff000040
  27 #define CCN_PRR         0xff000044
  28
  29 /*
  30  * User space process size: 2GB.
  31  *
  32  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  33  */
  34 #define TASK_SIZE       0x7c000000UL
  35
  36 #define STACK_TOP       TASK_SIZE
  37 #define STACK_TOP_MAX   STACK_TOP
  38
  39 /* This decides where the kernel will search for a free chunk of vm
  40  * space during mmap's.
  41  */
  42 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE / 3)
  43
  44 /*
  45  * Bit of SR register
  46  *
  47  * FD-bit:
  48  *     When it's set, it means the processor doesn't have right to use FPU,
  49  *     and it results exception when the floating operation is executed.
  50  *
  51  * IMASK-bit:
  52  *     Interrupt level mask
  53  */
  54 #define SR_DSP          0x00001000
  55 #define SR_IMASK        0x000000f0
  56 #define SR_FD           0x00008000
  57 #define SR_MD           0x40000000
  58
  59 /*
  60  * DSP structure and data
  61  */
  62 struct sh_dsp_struct {
  63         unsigned long dsp_regs[14];
  64         long status;
  65 };
  66
  67 /*
  68  * FPU structure and data
  69  */
  70
  71 struct sh_fpu_hard_struct {
  72         unsigned long fp_regs[16];
  73         unsigned long xfp_regs[16];
  74         unsigned long fpscr;
  75         unsigned long fpul;
  76
  77         long status; /* software status information */
  78 };
  79
  80 /* Dummy fpu emulator  */
  81 struct sh_fpu_soft_struct {
  82         unsigned long fp_regs[16];
  83         unsigned long xfp_regs[16];
  84         unsigned long fpscr;
  85         unsigned long fpul;
  86
  87         unsigned char lookahead;
  88         unsigned long entry_pc;
  89 };
  90
  91 union thread_xstate {
  92         struct sh_fpu_hard_struct hardfpu;
  93         struct sh_fpu_soft_struct softfpu;
  94 };
  95
  96 struct thread_struct {
  97         /* Saved registers when thread is descheduled */
  98         unsigned long sp;
  99         unsigned long pc;
 100
 101         /* Various thread flags, see SH_THREAD_xxx */
 102         unsigned long flags;
 103
 104         /* Save middle states of ptrace breakpoints */
 105         struct perf_event *ptrace_bps[HBP_NUM];
 106
 107 #ifdef CONFIG_SH_DSP
 108         /* Dsp status information */
 109         struct sh_dsp_struct dsp_status;
 110 #endif
 111
 112         /* Extended processor state */
 113         union thread_xstate *xstate;
 114
 115         /*
 116          * fpu_counter contains the number of consecutive context switches
 117          * that the FPU is used. If this is over a threshold, the lazy fpu
 118          * saving becomes unlazy to save the trap. This is an unsigned char
 119          * so that after 256 times the counter wraps and the behavior turns
 120          * lazy again; this to deal with bursty apps that only use FPU for
 121          * a short time
 122          */
 123         unsigned char fpu_counter;
 124 };
 125
 126 #define INIT_THREAD  {                                          \
 127         .sp = sizeof(init_stack) + (long) &init_stack,          \
 128         .flags = 0,                                             \
 129 }
 130
 131 /* Forward declaration, a strange C thing */
 132 struct task_struct;
 133
 134 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
 135
 136 /* Free all resources held by a thread. */
 137 extern void release_thread(struct task_struct *);
 138
 139 /*
 140  * FPU lazy state save handling.
 141  */
 142
 143 static __inline__ void disable_fpu(void)
 144 {
 145         unsigned long __dummy;
 146
 147         /* Set FD flag in SR */
 148         __asm__ __volatile__("stc       sr, %0\n\t"
 149                              "or        %1, %0\n\t"
 150                              "ldc       %0, sr"
 151                              : "=&r" (__dummy)
 152                              : "r" (SR_FD));
 153 }
 154
 155 static __inline__ void enable_fpu(void)
 156 {
 157         unsigned long __dummy;
 158
 159         /* Clear out FD flag in SR */
 160         __asm__ __volatile__("stc       sr, %0\n\t"
 161                              "and       %1, %0\n\t"
 162                              "ldc       %0, sr"
 163                              : "=&r" (__dummy)
 164                              : "r" (~SR_FD));
 165 }
 166
 167 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 168 #define FPSCR_INIT  0x00080000
 169
 170 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 171 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 172
 173 /*
 174  * Return saved PC of a blocked thread.
 175  */
 176 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 177
 178 void show_trace(struct task_struct *tsk, unsigned long *sp,
 179                 struct pt_regs *regs);
 180
 181 #ifdef CONFIG_DUMP_CODE
 182 void show_code(struct pt_regs *regs);
 183 #else
 184 static inline void show_code(struct pt_regs *regs)
 185 {
 186 }
 187 #endif
 188
 189 extern unsigned long get_wchan(struct task_struct *p);
 190
 191 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 192 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 193
 194 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
 195
 196 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 197 #define ARCH_HAS_PREFETCH
 198 #define ARCH_HAS_PREFETCHW
 199
 200 static inline void prefetch(const void *x)
 201 {
 202         __builtin_prefetch(x, 0, 3);
 203 }
 204
 205 static inline void prefetchw(const void *x)
 206 {
 207         __builtin_prefetch(x, 1, 3);
 208 }
 209 #endif
 210
 211 #endif /* __KERNEL__ */
 212 #endif /* __ASM_SH_PROCESSOR_32_H */