include/asm-sh/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 <asm/page.h>
  14 #include <asm/types.h>
  15 #include <asm/cache.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\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 struct sh_cpuinfo {
  30         unsigned int type;
  31         unsigned long loops_per_jiffy;
  32         unsigned long asid_cache;
  33
  34         struct cache_info icache;       /* Primary I-cache */
  35         struct cache_info dcache;       /* Primary D-cache */
  36         struct cache_info scache;       /* Secondary cache */
  37
  38         unsigned long flags;
  39 } __attribute__ ((aligned(L1_CACHE_BYTES)));
  40
  41 extern struct sh_cpuinfo cpu_data[];
  42 #define boot_cpu_data cpu_data[0]
  43 #define current_cpu_data cpu_data[smp_processor_id()]
  44 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
  45
  46 /*
  47  * User space process size: 2GB.
  48  *
  49  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  50  */
  51 #define TASK_SIZE       0x7c000000UL
  52
  53 #define STACK_TOP       TASK_SIZE
  54 #define STACK_TOP_MAX   STACK_TOP
  55
  56 /* This decides where the kernel will search for a free chunk of vm
  57  * space during mmap's.
  58  */
  59 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  60
  61 /*
  62  * Bit of SR register
  63  *
  64  * FD-bit:
  65  *     When it's set, it means the processor doesn't have right to use FPU,
  66  *     and it results exception when the floating operation is executed.
  67  *
  68  * IMASK-bit:
  69  *     Interrupt level mask
  70  */
  71 #define SR_DSP          0x00001000
  72 #define SR_IMASK        0x000000f0
  73 #define SR_FD           0x00008000
  74
  75 /*
  76  * FPU structure and data
  77  */
  78
  79 struct sh_fpu_hard_struct {
  80         unsigned long fp_regs[16];
  81         unsigned long xfp_regs[16];
  82         unsigned long fpscr;
  83         unsigned long fpul;
  84
  85         long status; /* software status information */
  86 };
  87
  88 /* Dummy fpu emulator  */
  89 struct sh_fpu_soft_struct {
  90         unsigned long fp_regs[16];
  91         unsigned long xfp_regs[16];
  92         unsigned long fpscr;
  93         unsigned long fpul;
  94
  95         unsigned char lookahead;
  96         unsigned long entry_pc;
  97 };
  98
  99 union sh_fpu_union {
 100         struct sh_fpu_hard_struct hard;
 101         struct sh_fpu_soft_struct soft;
 102 };
 103
 104 struct thread_struct {
 105         /* Saved registers when thread is descheduled */
 106         unsigned long sp;
 107         unsigned long pc;
 108
 109         /* Hardware debugging registers */
 110         unsigned long ubc_pc;
 111
 112         /* floating point info */
 113         union sh_fpu_union fpu;
 114 };
 115
 116 /* Count of active tasks with UBC settings */
 117 extern int ubc_usercnt;
 118
 119 #define INIT_THREAD  {                                          \
 120         .sp = sizeof(init_stack) + (long) &init_stack,          \
 121 }
 122
 123 /*
 124  * Do necessary setup to start up a newly executed thread.
 125  */
 126 #define start_thread(regs, new_pc, new_sp)       \
 127         set_fs(USER_DS);                         \
 128         regs->pr = 0;                            \
 129         regs->sr = SR_FD;       /* User mode. */ \
 130         regs->pc = new_pc;                       \
 131         regs->regs[15] = new_sp
 132
 133 /* Forward declaration, a strange C thing */
 134 struct task_struct;
 135 struct mm_struct;
 136
 137 /* Free all resources held by a thread. */
 138 extern void release_thread(struct task_struct *);
 139
 140 /* Prepare to copy thread state - unlazy all lazy status */
 141 #define prepare_to_copy(tsk)    do { } while (0)
 142
 143 /*
 144  * create a kernel thread without removing it from tasklists
 145  */
 146 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 147
 148 /* Copy and release all segment info associated with a VM */
 149 #define copy_segments(p, mm)    do { } while(0)
 150 #define release_segments(mm)    do { } while(0)
 151
 152 /*
 153  * FPU lazy state save handling.
 154  */
 155
 156 static __inline__ void disable_fpu(void)
 157 {
 158         unsigned long __dummy;
 159
 160         /* Set FD flag in SR */
 161         __asm__ __volatile__("stc       sr, %0\n\t"
 162                              "or        %1, %0\n\t"
 163                              "ldc       %0, sr"
 164                              : "=&r" (__dummy)
 165                              : "r" (SR_FD));
 166 }
 167
 168 static __inline__ void enable_fpu(void)
 169 {
 170         unsigned long __dummy;
 171
 172         /* Clear out FD flag in SR */
 173         __asm__ __volatile__("stc       sr, %0\n\t"
 174                              "and       %1, %0\n\t"
 175                              "ldc       %0, sr"
 176                              : "=&r" (__dummy)
 177                              : "r" (~SR_FD));
 178 }
 179
 180 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 181 #define FPSCR_INIT  0x00080000
 182
 183 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 184 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 185
 186 /*
 187  * Return saved PC of a blocked thread.
 188  */
 189 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 190
 191 void show_trace(struct task_struct *tsk, unsigned long *sp,
 192                 struct pt_regs *regs);
 193 extern unsigned long get_wchan(struct task_struct *p);
 194
 195 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 196 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 197
 198 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 199 #define cpu_relax()     barrier()
 200
 201 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 202     defined(CONFIG_CPU_SH4)
 203 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 204 #define ARCH_HAS_PREFETCH
 205 #define ARCH_HAS_PREFETCHW
 206 static inline void prefetch(void *x)
 207 {
 208         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 209 }
 210
 211 #define prefetchw(x)    prefetch(x)
 212 #endif
 213
 214 #endif /* __KERNEL__ */
 215 #endif /* __ASM_SH_PROCESSOR_32_H */