kernel/2.6.29.6-aldebaran-rt/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  * FPU structure and data
  62  */
  63
  64 struct sh_fpu_hard_struct {
  65         unsigned long fp_regs[16];
  66         unsigned long xfp_regs[16];
  67         unsigned long fpscr;
  68         unsigned long fpul;
  69
  70         long status; /* software status information */
  71 };
  72
  73 /* Dummy fpu emulator  */
  74 struct sh_fpu_soft_struct {
  75         unsigned long fp_regs[16];
  76         unsigned long xfp_regs[16];
  77         unsigned long fpscr;
  78         unsigned long fpul;
  79
  80         unsigned char lookahead;
  81         unsigned long entry_pc;
  82 };
  83
  84 union sh_fpu_union {
  85         struct sh_fpu_hard_struct hard;
  86         struct sh_fpu_soft_struct soft;
  87 };
  88
  89 struct thread_struct {
  90         /* Saved registers when thread is descheduled */
  91         unsigned long sp;
  92         unsigned long pc;
  93
  94         /* Hardware debugging registers */
  95         unsigned long ubc_pc;
  96
  97         /* floating point info */
  98         union sh_fpu_union fpu;
  99 };
 100
 101 /* Count of active tasks with UBC settings */
 102 extern int ubc_usercnt;
 103
 104 #define INIT_THREAD  {                                          \
 105         .sp = sizeof(init_stack) + (long) &init_stack,          \
 106 }
 107
 108 /*
 109  * Do necessary setup to start up a newly executed thread.
 110  */
 111 #define start_thread(regs, new_pc, new_sp)       \
 112         set_fs(USER_DS);                         \
 113         regs->pr = 0;                            \
 114         regs->sr = SR_FD;       /* User mode. */ \
 115         regs->pc = new_pc;                       \
 116         regs->regs[15] = new_sp
 117
 118 /* Forward declaration, a strange C thing */
 119 struct task_struct;
 120 struct mm_struct;
 121
 122 /* Free all resources held by a thread. */
 123 extern void release_thread(struct task_struct *);
 124
 125 /* Prepare to copy thread state - unlazy all lazy status */
 126 #define prepare_to_copy(tsk)    do { } while (0)
 127
 128 /*
 129  * create a kernel thread without removing it from tasklists
 130  */
 131 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 132
 133 /* Copy and release all segment info associated with a VM */
 134 #define copy_segments(p, mm)    do { } while(0)
 135 #define release_segments(mm)    do { } while(0)
 136
 137 /*
 138  * FPU lazy state save handling.
 139  */
 140
 141 static __inline__ void disable_fpu(void)
 142 {
 143         unsigned long __dummy;
 144
 145         /* Set FD flag in SR */
 146         __asm__ __volatile__("stc       sr, %0\n\t"
 147                              "or        %1, %0\n\t"
 148                              "ldc       %0, sr"
 149                              : "=&r" (__dummy)
 150                              : "r" (SR_FD));
 151 }
 152
 153 static __inline__ void enable_fpu(void)
 154 {
 155         unsigned long __dummy;
 156
 157         /* Clear out FD flag in SR */
 158         __asm__ __volatile__("stc       sr, %0\n\t"
 159                              "and       %1, %0\n\t"
 160                              "ldc       %0, sr"
 161                              : "=&r" (__dummy)
 162                              : "r" (~SR_FD));
 163 }
 164
 165 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 166 #define FPSCR_INIT  0x00080000
 167
 168 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 169 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 170
 171 /*
 172  * Return saved PC of a blocked thread.
 173  */
 174 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 175
 176 void show_trace(struct task_struct *tsk, unsigned long *sp,
 177                 struct pt_regs *regs);
 178
 179 #ifdef CONFIG_DUMP_CODE
 180 void show_code(struct pt_regs *regs);
 181 #else
 182 static inline void show_code(struct pt_regs *regs)
 183 {
 184 }
 185 #endif
 186
 187 extern unsigned long get_wchan(struct task_struct *p);
 188
 189 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 190 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 191
 192 #define user_stack_pointer(regs)        ((regs)->regs[15])
 193
 194 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 195     defined(CONFIG_CPU_SH4)
 196 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 197 #define ARCH_HAS_PREFETCH
 198 #define ARCH_HAS_PREFETCHW
 199 static inline void prefetch(void *x)
 200 {
 201         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 202 }
 203
 204 #define prefetchw(x)    prefetch(x)
 205 #endif
 206
 207 #endif /* __KERNEL__ */
 208 #endif /* __ASM_SH_PROCESSOR_32_H */