include/asm-sh/processor.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_H
   9 #define __ASM_SH_PROCESSOR_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 #include <asm/cpu-features.h>
  18
  19 /*
  20  * Default implementation of macro that returns current
  21  * instruction pointer ("program counter").
  22  */
  23 #define current_text_addr() ({ void *pc; __asm__("mova  1f, %0\n1:":"=z" (pc)); pc; })
  24
  25 /* Core Processor Version Register */
  26 #define CCN_PVR         0xff000030
  27 #define CCN_CVR         0xff000040
  28 #define CCN_PRR         0xff000044
  29
  30 /*
  31  *  CPU type and hardware bug flags. Kept separately for each CPU.
  32  *
  33  *  Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
  34  *  in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
  35  *  for parsing the subtype in get_cpu_subtype().
  36  */
  37 enum cpu_type {
  38         /* SH-2 types */
  39         CPU_SH7604,
  40
  41         /* SH-3 types */
  42         CPU_SH7705, CPU_SH7706, CPU_SH7707,
  43         CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
  44         CPU_SH7709, CPU_SH7709A, CPU_SH7710,
  45         CPU_SH7729, CPU_SH7300,
  46
  47         /* SH-4 types */
  48         CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
  49         CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
  50         CPU_SH73180, CPU_SH7343, CPU_SH7770, CPU_SH7780, CPU_SH7781,
  51
  52         /* Unknown subtype */
  53         CPU_SH_NONE
  54 };
  55
  56 struct sh_cpuinfo {
  57         unsigned int type;
  58         unsigned long loops_per_jiffy;
  59
  60         struct cache_info icache;       /* Primary I-cache */
  61         struct cache_info dcache;       /* Primary D-cache */
  62         struct cache_info scache;       /* Secondary cache */
  63
  64         unsigned long flags;
  65 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
  66
  67 extern struct sh_cpuinfo boot_cpu_data;
  68
  69 #ifdef CONFIG_SMP
  70 extern struct sh_cpuinfo cpu_data[];
  71 #define current_cpu_data cpu_data[smp_processor_id()]
  72 #else
  73 #define cpu_data (&boot_cpu_data)
  74 #define current_cpu_data boot_cpu_data
  75 #endif
  76
  77 /*
  78  * User space process size: 2GB.
  79  *
  80  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  81  */
  82 #define TASK_SIZE       0x7c000000UL
  83
  84 /* This decides where the kernel will search for a free chunk of vm
  85  * space during mmap's.
  86  */
  87 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  88
  89 /*
  90  * Bit of SR register
  91  *
  92  * FD-bit:
  93  *     When it's set, it means the processor doesn't have right to use FPU,
  94  *     and it results exception when the floating operation is executed.
  95  *
  96  * IMASK-bit:
  97  *     Interrupt level mask
  98  */
  99 #define SR_FD           0x00008000
 100 #define SR_DSP          0x00001000
 101 #define SR_IMASK        0x000000f0
 102
 103 /*
 104  * FPU structure and data
 105  */
 106
 107 struct sh_fpu_hard_struct {
 108         unsigned long fp_regs[16];
 109         unsigned long xfp_regs[16];
 110         unsigned long fpscr;
 111         unsigned long fpul;
 112
 113         long status; /* software status information */
 114 };
 115
 116 /* Dummy fpu emulator  */
 117 struct sh_fpu_soft_struct {
 118         unsigned long fp_regs[16];
 119         unsigned long xfp_regs[16];
 120         unsigned long fpscr;
 121         unsigned long fpul;
 122
 123         unsigned char lookahead;
 124         unsigned long entry_pc;
 125 };
 126
 127 union sh_fpu_union {
 128         struct sh_fpu_hard_struct hard;
 129         struct sh_fpu_soft_struct soft;
 130 };
 131
 132 struct thread_struct {
 133         unsigned long sp;
 134         unsigned long pc;
 135
 136         unsigned long trap_no, error_code;
 137         unsigned long address;
 138         /* Hardware debugging registers may come here */
 139         unsigned long ubc_pc;
 140
 141         /* floating point info */
 142         union sh_fpu_union fpu;
 143 };
 144
 145 typedef struct {
 146         unsigned long seg;
 147 } mm_segment_t;
 148
 149 /* Count of active tasks with UBC settings */
 150 extern int ubc_usercnt;
 151
 152 #define INIT_THREAD  {                                          \
 153         sizeof(init_stack) + (long) &init_stack, /* sp */       \
 154         0,                                       /* pc */       \
 155         0, 0,                                                   \
 156         0,                                                      \
 157         0,                                                      \
 158         {{{0,}},}                               /* fpu state */ \
 159 }
 160
 161 /*
 162  * Do necessary setup to start up a newly executed thread.
 163  */
 164 #define start_thread(regs, new_pc, new_sp)       \
 165         set_fs(USER_DS);                         \
 166         regs->pr = 0;                            \
 167         regs->sr = SR_FD;       /* User mode. */ \
 168         regs->pc = new_pc;                       \
 169         regs->regs[15] = new_sp
 170
 171 /* Forward declaration, a strange C thing */
 172 struct task_struct;
 173 struct mm_struct;
 174
 175 /* Free all resources held by a thread. */
 176 extern void release_thread(struct task_struct *);
 177
 178 /* Prepare to copy thread state - unlazy all lazy status */
 179 #define prepare_to_copy(tsk)    do { } while (0)
 180
 181 /*
 182  * create a kernel thread without removing it from tasklists
 183  */
 184 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 185
 186 /* Copy and release all segment info associated with a VM */
 187 #define copy_segments(p, mm)    do { } while(0)
 188 #define release_segments(mm)    do { } while(0)
 189
 190 /*
 191  * FPU lazy state save handling.
 192  */
 193
 194 static __inline__ void disable_fpu(void)
 195 {
 196         unsigned long __dummy;
 197
 198         /* Set FD flag in SR */
 199         __asm__ __volatile__("stc       sr, %0\n\t"
 200                              "or        %1, %0\n\t"
 201                              "ldc       %0, sr"
 202                              : "=&r" (__dummy)
 203                              : "r" (SR_FD));
 204 }
 205
 206 static __inline__ void enable_fpu(void)
 207 {
 208         unsigned long __dummy;
 209
 210         /* Clear out FD flag in SR */
 211         __asm__ __volatile__("stc       sr, %0\n\t"
 212                              "and       %1, %0\n\t"
 213                              "ldc       %0, sr"
 214                              : "=&r" (__dummy)
 215                              : "r" (~SR_FD));
 216 }
 217
 218 static __inline__ void release_fpu(struct pt_regs *regs)
 219 {
 220         regs->sr |= SR_FD;
 221 }
 222
 223 static __inline__ void grab_fpu(struct pt_regs *regs)
 224 {
 225         regs->sr &= ~SR_FD;
 226 }
 227
 228 #ifdef CONFIG_CPU_SH4
 229 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
 230 #else
 231 #define save_fpu(tsk)   do { } while (0)
 232 #endif
 233
 234 #define unlazy_fpu(tsk, regs) do {                      \
 235         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {   \
 236                 save_fpu(tsk, regs);                    \
 237         }                                               \
 238 } while (0)
 239
 240 #define clear_fpu(tsk, regs) do {                               \
 241         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {           \
 242                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);        \
 243                 release_fpu(regs);                              \
 244         }                                                       \
 245 } while (0)
 246
 247 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 248 #define FPSCR_INIT  0x00080000
 249
 250 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 251 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 252
 253 /*
 254  * Return saved PC of a blocked thread.
 255  */
 256 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 257
 258 void show_trace(struct task_struct *tsk, unsigned long *sp,
 259                 struct pt_regs *regs);
 260 extern unsigned long get_wchan(struct task_struct *p);
 261
 262 #define KSTK_EIP(tsk)  ((tsk)->thread.pc)
 263 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
 264
 265 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 266 #define cpu_relax()     barrier()
 267
 268 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 269     defined(CONFIG_CPU_SH4)
 270 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 271 #define ARCH_HAS_PREFETCH
 272 #define ARCH_HAS_PREFETCHW
 273 static inline void prefetch(void *x)
 274 {
 275         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 276 }
 277
 278 #define prefetchw(x)    prefetch(x)
 279 #endif
 280
 281 #ifdef CONFIG_VSYSCALL
 282 extern int vsyscall_init(void);
 283 #else
 284 #define vsyscall_init() do { } while (0)
 285 #endif
 286
 287 #endif /* __KERNEL__ */
 288 #endif /* __ASM_SH_PROCESSOR_H */