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