include/asm-sh64/system.h

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