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
  74 /*
  75  * FPU structure and data
  76  */
  77
  78 struct sh_fpu_hard_struct {
  79         unsigned long fp_regs[16];
  80         unsigned long xfp_regs[16];
  81         unsigned long fpscr;
  82         unsigned long fpul;
  83
  84         long status; /* software status information */
  85 };
  86
  87 /* Dummy fpu emulator  */
  88 struct sh_fpu_soft_struct {
  89         unsigned long fp_regs[16];
  90         unsigned long xfp_regs[16];
  91         unsigned long fpscr;
  92         unsigned long fpul;
  93
  94         unsigned char lookahead;
  95         unsigned long entry_pc;
  96 };
  97
  98 union sh_fpu_union {
  99         struct sh_fpu_hard_struct hard;
 100         struct sh_fpu_soft_struct soft;
 101 };
 102
 103 struct thread_struct {
 104         /* Saved registers when thread is descheduled */
 105         unsigned long sp;
 106         unsigned long pc;
 107
 108         /* Hardware debugging registers */
 109         unsigned long ubc_pc;
 110
 111         /* floating point info */
 112         union sh_fpu_union fpu;
 113 };
 114
 115 typedef struct {
 116         unsigned long seg;
 117 } mm_segment_t;
 118
 119 /* Count of active tasks with UBC settings */
 120 extern int ubc_usercnt;
 121
 122 #define INIT_THREAD  {                                          \
 123         .sp = sizeof(init_stack) + (long) &init_stack,          \
 124 }
 125
 126 /*
 127  * Do necessary setup to start up a newly executed thread.
 128  */
 129 #define start_thread(regs, new_pc, new_sp)       \
 130         set_fs(USER_DS);                         \
 131         regs->pr = 0;                            \
 132         regs->sr = SR_FD;       /* User mode. */ \
 133         regs->pc = new_pc;                       \
 134         regs->regs[15] = new_sp
 135
 136 /* Forward declaration, a strange C thing */
 137 struct task_struct;
 138 struct mm_struct;
 139
 140 /* Free all resources held by a thread. */
 141 extern void release_thread(struct task_struct *);
 142
 143 /* Prepare to copy thread state - unlazy all lazy status */
 144 #define prepare_to_copy(tsk)    do { } while (0)
 145
 146 /*
 147  * create a kernel thread without removing it from tasklists
 148  */
 149 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 150
 151 /* Copy and release all segment info associated with a VM */
 152 #define copy_segments(p, mm)    do { } while(0)
 153 #define release_segments(mm)    do { } while(0)
 154
 155 /*
 156  * FPU lazy state save handling.
 157  */
 158
 159 static __inline__ void disable_fpu(void)
 160 {
 161         unsigned long __dummy;
 162
 163         /* Set FD flag in SR */
 164         __asm__ __volatile__("stc       sr, %0\n\t"
 165                              "or        %1, %0\n\t"
 166                              "ldc       %0, sr"
 167                              : "=&r" (__dummy)
 168                              : "r" (SR_FD));
 169 }
 170
 171 static __inline__ void enable_fpu(void)
 172 {
 173         unsigned long __dummy;
 174
 175         /* Clear out FD flag in SR */
 176         __asm__ __volatile__("stc       sr, %0\n\t"
 177                              "and       %1, %0\n\t"
 178                              "ldc       %0, sr"
 179                              : "=&r" (__dummy)
 180                              : "r" (~SR_FD));
 181 }
 182
 183 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 184 #define FPSCR_INIT  0x00080000
 185
 186 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 187 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 188
 189 /*
 190  * Return saved PC of a blocked thread.
 191  */
 192 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 193
 194 void show_trace(struct task_struct *tsk, unsigned long *sp,
 195                 struct pt_regs *regs);
 196 extern unsigned long get_wchan(struct task_struct *p);
 197
 198 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 199 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 200
 201 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 202 #define cpu_relax()     barrier()
 203
 204 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 205     defined(CONFIG_CPU_SH4)
 206 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 207 #define ARCH_HAS_PREFETCH
 208 #define ARCH_HAS_PREFETCHW
 209 static inline void prefetch(void *x)
 210 {
 211         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 212 }
 213
 214 #define prefetchw(x)    prefetch(x)
 215 #endif
 216
 217 #endif /* __KERNEL__ */
 218 #endif /* __ASM_SH_PROCESSOR_32_H */