include/asm-arm26/system.h

   1 #ifndef __ASM_ARM_SYSTEM_H
   2 #define __ASM_ARM_SYSTEM_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/config.h>
   7 #include <linux/kernel.h>
   8 #include <asm/proc-fns.h>
   9
  10 #define vectors_base()  (0)
  11
  12 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
  13 {
  14         extern void __bad_xchg(volatile void *, int);
  15
  16         switch (size) {
  17                 case 1: return cpu_xchg_1(x, ptr);
  18                 case 4: return cpu_xchg_4(x, ptr);
  19                 default: __bad_xchg(ptr, size);
  20         }
  21         return 0;
  22 }
  23
  24 /*
  25  * We need to turn the caches off before calling the reset vector - RiscOS
  26  * messes up if we don't
  27  */
  28 #define proc_hard_reset()       cpu_proc_fin()
  29
  30 /*
  31  * A couple of speedups for the ARM
  32  */
  33
  34 /*
  35  * Enable IRQs  (sti)
  36  */
  37 #define local_irq_enable()                                      \
  38         do {                                    \
  39           unsigned long temp;                   \
  40           __asm__ __volatile__(                 \
  41 "       mov     %0, pc          @ sti\n"        \
  42 "       bic     %0, %0, #0x08000000\n"          \
  43 "       teqp    %0, #0\n"                       \
  44           : "=r" (temp)                         \
  45           :                                     \
  46           : "memory");                          \
  47         } while(0)
  48
  49 /*
  50  * Disable IRQs (cli)
  51  */
  52 #define local_irq_disable()                                     \
  53         do {                                    \
  54           unsigned long temp;                   \
  55           __asm__ __volatile__(                 \
  56 "       mov     %0, pc          @ cli\n"        \
  57 "       orr     %0, %0, #0x08000000\n"          \
  58 "       teqp    %0, #0\n"                       \
  59           : "=r" (temp)                         \
  60           :                                     \
  61           : "memory");                          \
  62         } while(0)
  63
  64 /* Disable FIQs  (clf) */
  65
  66 #define __clf() do {                            \
  67         unsigned long temp;                     \
  68         __asm__ __volatile__(                   \
  69 "       mov     %0, pc          @ clf\n"        \
  70 "       orr     %0, %0, #0x04000000\n"          \
  71 "       teqp    %0, #0\n"                       \
  72         : "=r" (temp));                         \
  73     } while(0)
  74
  75 /* Enable FIQs (stf) */
  76
  77 #define __stf() do {                            \
  78         unsigned long temp;                     \
  79         __asm__ __volatile__(                   \
  80 "       mov     %0, pc          @ stf\n"        \
  81 "       bic     %0, %0, #0x04000000\n"          \
  82 "       teqp    %0, #0\n"                       \
  83         : "=r" (temp));                         \
  84     } while(0)
  85
  86 /*
  87  * save current IRQ & FIQ state
  88  */
  89 #define local_save_flags(x)                             \
  90         do {                                    \
  91           __asm__ __volatile__(                 \
  92 "       mov     %0, pc          @ save_flags\n" \
  93 "       and     %0, %0, #0x0c000000\n"          \
  94           : "=r" (x));                          \
  95         } while (0)
  96
  97 /*
  98  * Save the current interrupt enable state & disable IRQs
  99  */
 100 #define local_irq_save(x)                               \
 101         do {                                            \
 102           unsigned long temp;                           \
 103           __asm__ __volatile__(                         \
 104 "       mov     %0, pc          @ save_flags_cli\n"     \
 105 "       orr     %1, %0, #0x08000000\n"                  \
 106 "       and     %0, %0, #0x0c000000\n"                  \
 107 "       teqp    %1, #0\n"                               \
 108           : "=r" (x), "=r" (temp)                       \
 109           :                                             \
 110           : "memory");                                  \
 111         } while (0)
 112
 113 /*
 114  * restore saved IRQ & FIQ state
 115  */
 116 #define local_irq_restore(x)                            \
 117         do {                                            \
 118           unsigned long temp;                           \
 119           __asm__ __volatile__(                         \
 120 "       mov     %0, pc          @ restore_flags\n"      \
 121 "       bic     %0, %0, #0x0c000000\n"                  \
 122 "       orr     %0, %0, %1\n"                           \
 123 "       teqp    %0, #0\n"                               \
 124           : "=&r" (temp)                                \
 125           : "r" (x)                                     \
 126           : "memory");                                  \
 127         } while (0)
 128
 129
 130 struct thread_info;
 131
 132 /* information about the system we're running on */
 133 extern unsigned int system_rev;
 134 extern unsigned int system_serial_low;
 135 extern unsigned int system_serial_high;
 136
 137 struct pt_regs;
 138
 139 void die(const char *msg, struct pt_regs *regs, int err)
 140                 __attribute__((noreturn));
 141
 142 void die_if_kernel(const char *str, struct pt_regs *regs, int err);
 143
 144 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 145                                        struct pt_regs *),
 146                      int sig, const char *name);
 147
 148 #define xchg(ptr,x) \
 149         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
 150
 151 #define tas(ptr) (xchg((ptr),1))
 152
 153 extern asmlinkage void __backtrace(void);
 154
 155 /*
 156  * Include processor dependent parts
 157  */
 158
 159 #define mb() __asm__ __volatile__ ("" : : : "memory")
 160 #define rmb() mb()
 161 #define wmb() mb()
 162 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 163
 164 #define prepare_to_switch()    do { } while(0)
 165
 166 /*
 167  * switch_to(prev, next) should switch from task `prev' to `next'
 168  * `prev' will never be the same as `next'.
 169  * The `mb' is to tell GCC not to cache `current' across this call.
 170  */
 171 struct thread_info;
 172
 173 extern struct task_struct *__switch_to(struct thread_info *, struct thread_info *);
 174
 175 #define switch_to(prev,next,last)                                       \
 176         do {                                                            \
 177                 __switch_to(prev->thread_info,next->thread_info);       \
 178                 mb();                                                   \
 179         } while (0)
 180
 181
 182 #ifdef CONFIG_SMP
 183 #error SMP not supported
 184 #endif /* CONFIG_SMP */
 185
 186 #define irqs_disabled()                 \
 187 ({                                      \
 188         unsigned long flags;            \
 189         local_save_flags(flags);        \
 190         flags & PSR_I_BIT;              \
 191 })
 192
 193 #define set_mb(var, value)  do { var = value; mb(); } while (0)
 194 #define smp_mb()                barrier()
 195 #define smp_rmb()               barrier()
 196 #define smp_wmb()               barrier()
 197 #define smp_read_barrier_depends()              do { } while(0)
 198
 199 #define clf()                   __clf()
 200 #define stf()                   __stf()
 201
 202 #endif /* __KERNEL__ */
 203
 204 #endif