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   1 #ifndef __ASM_SH64_SYSTEM_H
   2 #define __ASM_SH64_SYSTEM_H
   3
   4 /*
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * include/asm-sh64/system.h
  10  *
  11  * Copyright (C) 2000, 2001  Paolo Alberelli
  12  * Copyright (C) 2003  Paul Mundt
  13  * Copyright (C) 2004  Richard Curnow
  14  *
  15  */
  16
  17 #include <linux/config.h>
  18 #include <asm/registers.h>
  19 #include <asm/processor.h>
  20
  21 /*
  22  *      switch_to() should switch tasks to task nr n, first
  23  */
  24
  25 typedef struct {
  26         unsigned long seg;
  27 } mm_segment_t;
  28
  29 extern struct task_struct *sh64_switch_to(struct task_struct *prev,
  30                                           struct thread_struct *prev_thread,
  31                                           struct task_struct *next,
  32                                           struct thread_struct *next_thread);
  33
  34 #define switch_to(prev,next,last) \
  35         do {\
  36                 if (last_task_used_math != next) {\
  37                         struct pt_regs *regs = next->thread.uregs;\
  38                         if (regs) regs->sr |= SR_FD;\
  39                 }\
  40                 last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
  41         } while(0)
  42
  43 #define nop() __asm__ __volatile__ ("nop")
  44
  45 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
  46
  47 #define tas(ptr) (xchg((ptr), 1))
  48
  49 extern void __xchg_called_with_bad_pointer(void);
  50
  51 #define mb()    __asm__ __volatile__ ("synco": : :"memory")
  52 #define rmb()   mb()
  53 #define wmb()   __asm__ __volatile__ ("synco": : :"memory")
  54 #define read_barrier_depends()  do { } while (0)
  55
  56 #ifdef CONFIG_SMP
  57 #define smp_mb()        mb()
  58 #define smp_rmb()       rmb()
  59 #define smp_wmb()       wmb()
  60 #define smp_read_barrier_depends()      read_barrier_depends()
  61 #else
  62 #define smp_mb()        barrier()
  63 #define smp_rmb()       barrier()
  64 #define smp_wmb()       barrier()
  65 #define smp_read_barrier_depends()      do { } while (0)
  66 #endif /* CONFIG_SMP */
  67
  68 #define set_rmb(var, value) do { xchg(&var, value); } while (0)
  69 #define set_mb(var, value) set_rmb(var, value)
  70 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
  71
  72 /* Interrupt Control */
  73 #ifndef HARD_CLI
  74 #define SR_MASK_L 0x000000f0L
  75 #define SR_MASK_LL 0x00000000000000f0LL
  76 #else
  77 #define SR_MASK_L 0x10000000L
  78 #define SR_MASK_LL 0x0000000010000000LL
  79 #endif
  80
  81 static __inline__ void local_irq_enable(void)
  82 {
  83         /* cli/sti based on SR.BL */
  84         unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
  85
  86         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  87                              "and       %0, %1, %0\n\t"
  88                              "putcon    %0, " __SR "\n\t"
  89                              : "=&r" (__dummy0)
  90                              : "r" (__dummy1));
  91 }
  92
  93 static __inline__ void local_irq_disable(void)
  94 {
  95         /* cli/sti based on SR.BL */
  96         unsigned long long __dummy0, __dummy1=SR_MASK_LL;
  97         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
  98                              "or        %0, %1, %0\n\t"
  99                              "putcon    %0, " __SR "\n\t"
 100                              : "=&r" (__dummy0)
 101                              : "r" (__dummy1));
 102 }
 103
 104 #define local_save_flags(x)                                             \
 105 (__extension__ ({       unsigned long long __dummy=SR_MASK_LL;          \
 106         __asm__ __volatile__(                                           \
 107                 "getcon " __SR ", %0\n\t"                               \
 108                 "and    %0, %1, %0"                                     \
 109                 : "=&r" (x)                                             \
 110                 : "r" (__dummy));}))
 111
 112 #define local_irq_save(x)                                               \
 113 (__extension__ ({       unsigned long long __d2=SR_MASK_LL, __d1;       \
 114         __asm__ __volatile__(                                           \
 115                 "getcon " __SR ", %1\n\t"                               \
 116                 "or     %1, r63, %0\n\t"                                \
 117                 "or     %1, %2, %1\n\t"                                 \
 118                 "putcon %1, " __SR "\n\t"                               \
 119                 "and    %0, %2, %0"                                     \
 120                 : "=&r" (x), "=&r" (__d1)                               \
 121                 : "r" (__d2));}));
 122
 123 #define local_irq_restore(x) do {                                       \
 124         if ( ((x) & SR_MASK_L) == 0 )           /* dropping to 0 ? */   \
 125                 local_irq_enable();             /* yes...re-enable */   \
 126 } while (0)
 127
 128 #define irqs_disabled()                 \
 129 ({                                      \
 130         unsigned long flags;            \
 131         local_save_flags(flags);        \
 132         (flags != 0);                   \
 133 })
 134
 135 static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
 136 {
 137         unsigned long flags, retval;
 138
 139         local_irq_save(flags);
 140         retval = *m;
 141         *m = val;
 142         local_irq_restore(flags);
 143         return retval;
 144 }
 145
 146 static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
 147 {
 148         unsigned long flags, retval;
 149
 150         local_irq_save(flags);
 151         retval = *m;
 152         *m = val & 0xff;
 153         local_irq_restore(flags);
 154         return retval;
 155 }
 156
 157 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 158 {
 159         switch (size) {
 160         case 4:
 161                 return xchg_u32(ptr, x);
 162                 break;
 163         case 1:
 164                 return xchg_u8(ptr, x);
 165                 break;
 166         }
 167         __xchg_called_with_bad_pointer();
 168         return x;
 169 }
 170
 171 /* XXX
 172  * disable hlt during certain critical i/o operations
 173  */
 174 #define HAVE_DISABLE_HLT
 175 void disable_hlt(void);
 176 void enable_hlt(void);
 177
 178
 179 #define smp_mb()        barrier()
 180 #define smp_rmb()       barrier()
 181 #define smp_wmb()       barrier()
 182
 183 #ifdef CONFIG_SH_ALPHANUMERIC
 184 /* This is only used for debugging. */
 185 extern void print_seg(char *file,int line);
 186 #define PLS() print_seg(__FILE__,__LINE__)
 187 #else   /* CONFIG_SH_ALPHANUMERIC */
 188 #define PLS()
 189 #endif  /* CONFIG_SH_ALPHANUMERIC */
 190
 191 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
 192
 193 #define arch_align_stack(x) (x)
 194
 195 #endif /* __ASM_SH64_SYSTEM_H */