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/ptrace.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 asmlinkage void __init sh_cpu_init(void);
  30
  31 /*
  32  * User space process size: 2GB.
  33  *
  34  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  35  */
  36 #define TASK_SIZE       0x7c000000UL
  37
  38 #define STACK_TOP       TASK_SIZE
  39 #define STACK_TOP_MAX   STACK_TOP
  40
  41 /* This decides where the kernel will search for a free chunk of vm
  42  * space during mmap's.
  43  */
  44 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  45
  46 /*
  47  * Bit of SR register
  48  *
  49  * FD-bit:
  50  *     When it's set, it means the processor doesn't have right to use FPU,
  51  *     and it results exception when the floating operation is executed.
  52  *
  53  * IMASK-bit:
  54  *     Interrupt level mask
  55  */
  56 #define SR_DSP          0x00001000
  57 #define SR_IMASK        0x000000f0
  58 #define SR_FD           0x00008000
  59
  60 /*
  61  * DSP structure and data
  62  */
  63 struct sh_dsp_struct {
  64         unsigned long dsp_regs[14];
  65         long status;
  66 };
  67
  68 /*
  69  * FPU structure and data
  70  */
  71
  72 struct sh_fpu_hard_struct {
  73         unsigned long fp_regs[16];
  74         unsigned long xfp_regs[16];
  75         unsigned long fpscr;
  76         unsigned long fpul;
  77
  78         long status; /* software status information */
  79 };
  80
  81 /* Dummy fpu emulator  */
  82 struct sh_fpu_soft_struct {
  83         unsigned long fp_regs[16];
  84         unsigned long xfp_regs[16];
  85         unsigned long fpscr;
  86         unsigned long fpul;
  87
  88         unsigned char lookahead;
  89         unsigned long entry_pc;
  90 };
  91
  92 union sh_fpu_union {
  93         struct sh_fpu_hard_struct hard;
  94         struct sh_fpu_soft_struct soft;
  95 };
  96
  97 struct thread_struct {
  98         /* Saved registers when thread is descheduled */
  99         unsigned long sp;
 100         unsigned long pc;
 101
 102         /* Hardware debugging registers */
 103         unsigned long ubc_pc;
 104
 105         /* floating point info */
 106         union sh_fpu_union fpu;
 107
 108 #ifdef CONFIG_SH_DSP
 109         /* Dsp status information */
 110         struct sh_dsp_struct dsp_status;
 111 #endif
 112 };
 113
 114 /* Count of active tasks with UBC settings */
 115 extern int ubc_usercnt;
 116
 117 #define INIT_THREAD  {                                          \
 118         .sp = sizeof(init_stack) + (long) &init_stack,          \
 119 }
 120
 121 /*
 122  * Do necessary setup to start up a newly executed thread.
 123  */
 124 #define start_thread(_regs, new_pc, new_sp)      \
 125         set_fs(USER_DS);                         \
 126         _regs->pr = 0;                           \
 127         _regs->sr = SR_FD;      /* User mode. */ \
 128         _regs->pc = new_pc;                      \
 129         _regs->regs[15] = new_sp
 130
 131 /* Forward declaration, a strange C thing */
 132 struct task_struct;
 133 struct mm_struct;
 134
 135 /* Free all resources held by a thread. */
 136 extern void release_thread(struct task_struct *);
 137
 138 /* Prepare to copy thread state - unlazy all lazy status */
 139 #define prepare_to_copy(tsk)    do { } while (0)
 140
 141 /*
 142  * create a kernel thread without removing it from tasklists
 143  */
 144 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 145
 146 /* Copy and release all segment info associated with a VM */
 147 #define copy_segments(p, mm)    do { } while(0)
 148 #define release_segments(mm)    do { } while(0)
 149
 150 /*
 151  * FPU lazy state save handling.
 152  */
 153
 154 static __inline__ void disable_fpu(void)
 155 {
 156         unsigned long __dummy;
 157
 158         /* Set FD flag in SR */
 159         __asm__ __volatile__("stc       sr, %0\n\t"
 160                              "or        %1, %0\n\t"
 161                              "ldc       %0, sr"
 162                              : "=&r" (__dummy)
 163                              : "r" (SR_FD));
 164 }
 165
 166 static __inline__ void enable_fpu(void)
 167 {
 168         unsigned long __dummy;
 169
 170         /* Clear out FD flag in SR */
 171         __asm__ __volatile__("stc       sr, %0\n\t"
 172                              "and       %1, %0\n\t"
 173                              "ldc       %0, sr"
 174                              : "=&r" (__dummy)
 175                              : "r" (~SR_FD));
 176 }
 177
 178 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 179 #define FPSCR_INIT  0x00080000
 180
 181 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 182 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 183
 184 /*
 185  * Return saved PC of a blocked thread.
 186  */
 187 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 188
 189 void show_trace(struct task_struct *tsk, unsigned long *sp,
 190                 struct pt_regs *regs);
 191
 192 #ifdef CONFIG_DUMP_CODE
 193 void show_code(struct pt_regs *regs);
 194 #else
 195 static inline void show_code(struct pt_regs *regs)
 196 {
 197 }
 198 #endif
 199
 200 extern unsigned long get_wchan(struct task_struct *p);
 201
 202 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 203 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 204
 205 #define user_stack_pointer(_regs)       ((_regs)->regs[15])
 206
 207 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
 208 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 209 #define ARCH_HAS_PREFETCH
 210 #define ARCH_HAS_PREFETCHW
 211 static inline void prefetch(void *x)
 212 {
 213         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 214 }
 215
 216 #define prefetchw(x)    prefetch(x)
 217 #endif
 218
 219 #endif /* __KERNEL__ */
 220 #endif /* __ASM_SH_PROCESSOR_32_H */