arch/sh/include/asm/system.h

   1 #ifndef __ASM_SH_SYSTEM_H
   2 #define __ASM_SH_SYSTEM_H
   3
   4 /*
   5  * Copyright (C) 1999, 2000  Niibe Yutaka  &  Kaz Kojima
   6  * Copyright (C) 2002 Paul Mundt
   7  */
   8
   9 #include <linux/irqflags.h>
  10 #include <linux/compiler.h>
  11 #include <linux/linkage.h>
  12 #include <asm/types.h>
  13 #include <asm/ptrace.h>
  14
  15 #define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
  16
  17 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
  18 #define __icbi()                        \
  19 {                                       \
  20         unsigned long __addr;           \
  21         __addr = 0xa8000000;            \
  22         __asm__ __volatile__(           \
  23                 "icbi   %0\n\t"         \
  24                 : /* no output */       \
  25                 : "m" (__m(__addr)));   \
  26 }
  27 #endif
  28
  29 /*
  30  * A brief note on ctrl_barrier(), the control register write barrier.
  31  *
  32  * Legacy SH cores typically require a sequence of 8 nops after
  33  * modification of a control register in order for the changes to take
  34  * effect. On newer cores (like the sh4a and sh5) this is accomplished
  35  * with icbi.
  36  *
  37  * Also note that on sh4a in the icbi case we can forego a synco for the
  38  * write barrier, as it's not necessary for control registers.
  39  *
  40  * Historically we have only done this type of barrier for the MMUCR, but
  41  * it's also necessary for the CCR, so we make it generic here instead.
  42  */
  43 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
  44 #define mb()            __asm__ __volatile__ ("synco": : :"memory")
  45 #define rmb()           mb()
  46 #define wmb()           __asm__ __volatile__ ("synco": : :"memory")
  47 #define ctrl_barrier()  __icbi()
  48 #define read_barrier_depends()  do { } while(0)
  49 #else
  50 #define mb()            __asm__ __volatile__ ("": : :"memory")
  51 #define rmb()           mb()
  52 #define wmb()           __asm__ __volatile__ ("": : :"memory")
  53 #define ctrl_barrier()  __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
  54 #define read_barrier_depends()  do { } while(0)
  55 #endif
  56
  57 #ifdef CONFIG_SMP
  58 #define smp_mb()        mb()
  59 #define smp_rmb()       rmb()
  60 #define smp_wmb()       wmb()
  61 #define smp_read_barrier_depends()      read_barrier_depends()
  62 #else
  63 #define smp_mb()        barrier()
  64 #define smp_rmb()       barrier()
  65 #define smp_wmb()       barrier()
  66 #define smp_read_barrier_depends()      do { } while(0)
  67 #endif
  68
  69 #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
  70
  71 #ifdef CONFIG_GUSA_RB
  72 #include <asm/cmpxchg-grb.h>
  73 #elif defined(CONFIG_CPU_SH4A)
  74 #include <asm/cmpxchg-llsc.h>
  75 #else
  76 #include <asm/cmpxchg-irq.h>
  77 #endif
  78
  79 extern void __xchg_called_with_bad_pointer(void);
  80
  81 #define __xchg(ptr, x, size)                            \
  82 ({                                                      \
  83         unsigned long __xchg__res;                      \
  84         volatile void *__xchg_ptr = (ptr);              \
  85         switch (size) {                                 \
  86         case 4:                                         \
  87                 __xchg__res = xchg_u32(__xchg_ptr, x);  \
  88                 break;                                  \
  89         case 1:                                         \
  90                 __xchg__res = xchg_u8(__xchg_ptr, x);   \
  91                 break;                                  \
  92         default:                                        \
  93                 __xchg_called_with_bad_pointer();       \
  94                 __xchg__res = x;                        \
  95                 break;                                  \
  96         }                                               \
  97                                                         \
  98         __xchg__res;                                    \
  99 })
 100
 101 #define xchg(ptr,x)     \
 102         ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
 103
 104 /* This function doesn't exist, so you'll get a linker error
 105  * if something tries to do an invalid cmpxchg(). */
 106 extern void __cmpxchg_called_with_bad_pointer(void);
 107
 108 #define __HAVE_ARCH_CMPXCHG 1
 109
 110 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 111                 unsigned long new, int size)
 112 {
 113         switch (size) {
 114         case 4:
 115                 return __cmpxchg_u32(ptr, old, new);
 116         }
 117         __cmpxchg_called_with_bad_pointer();
 118         return old;
 119 }
 120
 121 #define cmpxchg(ptr,o,n)                                                 \
 122   ({                                                                     \
 123      __typeof__(*(ptr)) _o_ = (o);                                       \
 124      __typeof__(*(ptr)) _n_ = (n);                                       \
 125      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
 126                                     (unsigned long)_n_, sizeof(*(ptr))); \
 127   })
 128
 129 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
 130 void free_initmem(void);
 131 void free_initrd_mem(unsigned long start, unsigned long end);
 132
 133 extern void *set_exception_table_vec(unsigned int vec, void *handler);
 134
 135 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
 136 {
 137         return set_exception_table_vec(evt >> 5, handler);
 138 }
 139
 140 /*
 141  * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
 142  */
 143 #ifdef CONFIG_CPU_SH2A
 144 extern unsigned int instruction_size(unsigned int insn);
 145 #elif defined(CONFIG_SUPERH32)
 146 #define instruction_size(insn)  (2)
 147 #else
 148 #define instruction_size(insn)  (4)
 149 #endif
 150
 151 extern unsigned long cached_to_uncached;
 152
 153 extern struct dentry *sh_debugfs_root;
 154
 155 void per_cpu_trap_init(void);
 156
 157 asmlinkage void break_point_trap(void);
 158
 159 #ifdef CONFIG_SUPERH32
 160 #define BUILD_TRAP_HANDLER(name)                                        \
 161 asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
 162                                     unsigned long r6, unsigned long r7, \
 163                                     struct pt_regs __regs)
 164
 165 #define TRAP_HANDLER_DECL                               \
 166         struct pt_regs *regs = RELOC_HIDE(&__regs, 0);  \
 167         unsigned int vec = regs->tra;                   \
 168         (void)vec;
 169 #else
 170 #define BUILD_TRAP_HANDLER(name)        \
 171 asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
 172 #define TRAP_HANDLER_DECL
 173 #endif
 174
 175 BUILD_TRAP_HANDLER(address_error);
 176 BUILD_TRAP_HANDLER(debug);
 177 BUILD_TRAP_HANDLER(bug);
 178 BUILD_TRAP_HANDLER(breakpoint);
 179 BUILD_TRAP_HANDLER(singlestep);
 180 BUILD_TRAP_HANDLER(fpu_error);
 181 BUILD_TRAP_HANDLER(fpu_state_restore);
 182
 183 #define arch_align_stack(x) (x)
 184
 185 struct mem_access {
 186         unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
 187         unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
 188 };
 189
 190 #ifdef CONFIG_SUPERH32
 191 # include "system_32.h"
 192 #else
 193 # include "system_64.h"
 194 #endif
 195
 196 #endif