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_SH7619,
  40
  41         /* SH-2A types */
  42         CPU_SH7206,
  43
  44         /* SH-3 types */
  45         CPU_SH7705, CPU_SH7706, CPU_SH7707,
  46         CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
  47         CPU_SH7709, CPU_SH7709A, CPU_SH7710, CPU_SH7712,
  48         CPU_SH7729, CPU_SH7300,
  49
  50         /* SH-4 types */
  51         CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
  52         CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
  53
  54         /* SH-4A types */
  55         CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, CPU_SHX3,
  56
  57         /* SH4AL-DSP types */
  58         CPU_SH73180, CPU_SH7343, CPU_SH7722,
  59
  60         /* Unknown subtype */
  61         CPU_SH_NONE
  62 };
  63
  64 struct sh_cpuinfo {
  65         unsigned int type;
  66         unsigned long loops_per_jiffy;
  67         unsigned long asid_cache;
  68
  69         struct cache_info icache;       /* Primary I-cache */
  70         struct cache_info dcache;       /* Primary D-cache */
  71         struct cache_info scache;       /* Secondary cache */
  72
  73         unsigned long flags;
  74 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
  75
  76 extern struct sh_cpuinfo boot_cpu_data;
  77
  78 #ifdef CONFIG_SMP
  79 extern struct sh_cpuinfo cpu_data[];
  80 #define current_cpu_data cpu_data[smp_processor_id()]
  81 #else
  82 #define cpu_data (&boot_cpu_data)
  83 #define current_cpu_data boot_cpu_data
  84 #endif
  85
  86 /*
  87  * User space process size: 2GB.
  88  *
  89  * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
  90  */
  91 #define TASK_SIZE       0x7c000000UL
  92
  93 /* This decides where the kernel will search for a free chunk of vm
  94  * space during mmap's.
  95  */
  96 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  97
  98 /*
  99  * Bit of SR register
 100  *
 101  * FD-bit:
 102  *     When it's set, it means the processor doesn't have right to use FPU,
 103  *     and it results exception when the floating operation is executed.
 104  *
 105  * IMASK-bit:
 106  *     Interrupt level mask
 107  */
 108 #define SR_FD           0x00008000
 109 #define SR_DSP          0x00001000
 110 #define SR_IMASK        0x000000f0
 111
 112 /*
 113  * FPU structure and data
 114  */
 115
 116 struct sh_fpu_hard_struct {
 117         unsigned long fp_regs[16];
 118         unsigned long xfp_regs[16];
 119         unsigned long fpscr;
 120         unsigned long fpul;
 121
 122         long status; /* software status information */
 123 };
 124
 125 /* Dummy fpu emulator  */
 126 struct sh_fpu_soft_struct {
 127         unsigned long fp_regs[16];
 128         unsigned long xfp_regs[16];
 129         unsigned long fpscr;
 130         unsigned long fpul;
 131
 132         unsigned char lookahead;
 133         unsigned long entry_pc;
 134 };
 135
 136 union sh_fpu_union {
 137         struct sh_fpu_hard_struct hard;
 138         struct sh_fpu_soft_struct soft;
 139 };
 140
 141 struct thread_struct {
 142         /* Saved registers when thread is descheduled */
 143         unsigned long sp;
 144         unsigned long pc;
 145
 146         /* Hardware debugging registers */
 147         unsigned long ubc_pc;
 148
 149         /* floating point info */
 150         union sh_fpu_union fpu;
 151 };
 152
 153 typedef struct {
 154         unsigned long seg;
 155 } mm_segment_t;
 156
 157 /* Count of active tasks with UBC settings */
 158 extern int ubc_usercnt;
 159
 160 #define INIT_THREAD  {                                          \
 161         .sp = sizeof(init_stack) + (long) &init_stack,          \
 162 }
 163
 164 /*
 165  * Do necessary setup to start up a newly executed thread.
 166  */
 167 #define start_thread(regs, new_pc, new_sp)       \
 168         set_fs(USER_DS);                         \
 169         regs->pr = 0;                            \
 170         regs->sr = SR_FD;       /* User mode. */ \
 171         regs->pc = new_pc;                       \
 172         regs->regs[15] = new_sp
 173
 174 /* Forward declaration, a strange C thing */
 175 struct task_struct;
 176 struct mm_struct;
 177
 178 /* Free all resources held by a thread. */
 179 extern void release_thread(struct task_struct *);
 180
 181 /* Prepare to copy thread state - unlazy all lazy status */
 182 #define prepare_to_copy(tsk)    do { } while (0)
 183
 184 /*
 185  * create a kernel thread without removing it from tasklists
 186  */
 187 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 188
 189 /* Copy and release all segment info associated with a VM */
 190 #define copy_segments(p, mm)    do { } while(0)
 191 #define release_segments(mm)    do { } while(0)
 192
 193 /*
 194  * FPU lazy state save handling.
 195  */
 196
 197 static __inline__ void disable_fpu(void)
 198 {
 199         unsigned long __dummy;
 200
 201         /* Set FD flag in SR */
 202         __asm__ __volatile__("stc       sr, %0\n\t"
 203                              "or        %1, %0\n\t"
 204                              "ldc       %0, sr"
 205                              : "=&r" (__dummy)
 206                              : "r" (SR_FD));
 207 }
 208
 209 static __inline__ void enable_fpu(void)
 210 {
 211         unsigned long __dummy;
 212
 213         /* Clear out FD flag in SR */
 214         __asm__ __volatile__("stc       sr, %0\n\t"
 215                              "and       %1, %0\n\t"
 216                              "ldc       %0, sr"
 217                              : "=&r" (__dummy)
 218                              : "r" (~SR_FD));
 219 }
 220
 221 static __inline__ void release_fpu(struct pt_regs *regs)
 222 {
 223         regs->sr |= SR_FD;
 224 }
 225
 226 static __inline__ void grab_fpu(struct pt_regs *regs)
 227 {
 228         regs->sr &= ~SR_FD;
 229 }
 230
 231 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
 232
 233 #define unlazy_fpu(tsk, regs) do {                      \
 234         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {   \
 235                 save_fpu(tsk, regs);                    \
 236         }                                               \
 237 } while (0)
 238
 239 #define clear_fpu(tsk, regs) do {                               \
 240         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {           \
 241                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);        \
 242                 release_fpu(regs);                              \
 243         }                                                       \
 244 } while (0)
 245
 246 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
 247 #define FPSCR_INIT  0x00080000
 248
 249 #define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
 250 #define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */
 251
 252 /*
 253  * Return saved PC of a blocked thread.
 254  */
 255 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 256
 257 void show_trace(struct task_struct *tsk, unsigned long *sp,
 258                 struct pt_regs *regs);
 259 extern unsigned long get_wchan(struct task_struct *p);
 260
 261 #define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
 262 #define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])
 263
 264 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 265 #define cpu_relax()     barrier()
 266
 267 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
 268     defined(CONFIG_CPU_SH4)
 269 #define PREFETCH_STRIDE         L1_CACHE_BYTES
 270 #define ARCH_HAS_PREFETCH
 271 #define ARCH_HAS_PREFETCHW
 272 static inline void prefetch(void *x)
 273 {
 274         __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
 275 }
 276
 277 #define prefetchw(x)    prefetch(x)
 278 #endif
 279
 280 #ifdef CONFIG_VSYSCALL
 281 extern int vsyscall_init(void);
 282 #else
 283 #define vsyscall_init() do { } while (0)
 284 #endif
 285
 286 /* arch/sh/kernel/setup.c */
 287 const char *get_cpu_subtype(struct sh_cpuinfo *c);
 288
 289 #endif /* __KERNEL__ */
 290 #endif /* __ASM_SH_PROCESSOR_H */