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 #define SR_MD           0x40000000
  60
  61 /*
  62  * DSP structure and data
  63  */
  64 struct sh_dsp_struct {
  65         unsigned long dsp_regs[14];
  66         long status;
  67 };
  68
  69 /*
  70  * FPU structure and data
  71  */
  72
  73 struct sh_fpu_hard_struct {
  74         unsigned long fp_regs[16];
  75         unsigned long xfp_regs[16];
  76         unsigned long fpscr;
  77         unsigned long fpul;
  78
  79         long status; /* software status information */
  80 };
  81
  82 /* Dummy fpu emulator  */
  83 struct sh_fpu_soft_struct {
  84         unsigned long fp_regs[16];
  85         unsigned long xfp_regs[16];
  86         unsigned long fpscr;
  87         unsigned long fpul;
  88
  89         unsigned char lookahead;
  90         unsigned long entry_pc;
  91 };
  92
  93 union sh_fpu_union {
  94         struct sh_fpu_hard_struct hard;
  95         struct sh_fpu_soft_struct soft;
  96 };
  97
  98 struct thread_struct {
  99         /* Saved registers when thread is descheduled */
 100         unsigned long sp;
 101         unsigned long pc;
 102
 103         /* Hardware debugging registers */
 104         unsigned long ubc_pc;
 105
 106         /* floating point info */
 107         union sh_fpu_union fpu;
 108
 109 #ifdef CONFIG_SH_DSP
 110         /* Dsp status information */
 111         struct sh_dsp_struct dsp_status;
 112 #endif
 113 };
 114
 115 /* Count of active tasks with UBC settings */
 116 extern int ubc_usercnt;
 117
 118 #define INIT_THREAD  {                                          \
 119         .sp = sizeof(init_stack) + (long) &init_stack,          \
 120 }
 121
 122 /*
 123  * Do necessary setup to start up a newly executed thread.
 124  */
 125 #define start_thread(_regs, new_pc, new_sp)      \
 126         set_fs(USER_DS);                         \
 127         _regs->pr = 0;                           \
 128         _regs->sr = SR_FD;      /* User mode. */ \
 129         _regs->pc = new_pc;                      \
 130         _regs->regs[15] = new_sp
 131
 132 /* Forward declaration, a strange C thing */
 133 struct task_struct;
 134 struct mm_struct;
 135
 136 /* Free all resources held by a thread. */
 137 extern void release_thread(struct task_struct *);
 138
 139 /* Prepare to copy thread state - unlazy all lazy status */
 140 void prepare_to_copy(struct task_struct *tsk);
 141
 142 /*
 143  * create a kernel thread without removing it from tasklists
 144  */
 145 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 146
 147 /* Copy and release all segment info associated with a VM */
 148 #define copy_segments(p, mm)    do { } while(0)
 149 #define release_segments(mm)    do { } while(0)
 150
 151 /*
 152  * FPU lazy state save handling.
 153  */
 154
 155 static __inline__ void disable_fpu(void)
 156 {
 157         unsigned long __dummy;
 158
 159         /* Set FD flag in SR */
 160         __asm__ __volatile__("stc       sr, %0\n\t"
 161                              "or        %1, %0\n\t"
 162                              "ldc       %0, sr"
 163                              : "=&r" (__dummy)
 164                              : "r" (SR_FD));
 165 }
 166
 167 static __inline__ void enable_fpu(void)
 168 {
 169         unsigned long __dummy;
 170
 171         /* Clear out FD flag in SR */
 172         __asm__ __volatile__("stc       sr, %0\n\t"
 173                              "and       %1, %0\n\t"
 174                              "ldc       %0, sr"
 175                              : "=&r" (__dummy)
 176                              : "r" (~SR_FD));
 177 }
 178
 179 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 180 #define FPSCR_INIT  0x00080000
 181
 182 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 183 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 184
 185 /*
 186  * Return saved PC of a blocked thread.
 187  */
 188 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 189
 190 void show_trace(struct task_struct *tsk, unsigned long *sp,
 191                 struct pt_regs *regs);
 192
 193 #ifdef CONFIG_DUMP_CODE
 194 void show_code(struct pt_regs *regs);
 195 #else
 196 static inline void show_code(struct pt_regs *regs)
 197 {
 198 }
 199 #endif
 200
 201 extern unsigned long get_wchan(struct task_struct *p);
 202
 203 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 204 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 205
 206 #define user_stack_pointer(_regs)       ((_regs)->regs[15])
 207
 208 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
 209 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 210 #define ARCH_HAS_PREFETCH
 211 #define ARCH_HAS_PREFETCHW
 212 static inline void prefetch(void *x)
 213 {
 214         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 215 }
 216
 217 #define prefetchw(x)    prefetch(x)
 218 #endif
 219
 220 #endif /* __KERNEL__ */
 221 #endif /* __ASM_SH_PROCESSOR_32_H */