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
   8 /*
   9  * This is used to ensure the compiler did actually allocate the register we
  10  * asked it for some inline assembly sequences.  Apparently we can't trust
  11  * the compiler from one version to another so a bit of paranoia won't hurt.
  12  * This string is meant to be concatenated with the inline asm string and
  13  * will cause compilation to stop on mismatch. (From ARM32 - may come in handy)
  14  */
  15 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
  16
  17 #ifndef __ASSEMBLY__
  18
  19 #include <linux/linkage.h>
  20
  21 struct thread_info;
  22 struct task_struct;
  23
  24 #if 0
  25 /* information about the system we're running on */
  26 extern unsigned int system_rev;
  27 extern unsigned int system_serial_low;
  28 extern unsigned int system_serial_high;
  29 extern unsigned int mem_fclk_21285;
  30
  31 FIXME - sort this
  32 /*
  33  * We need to turn the caches off before calling the reset vector - RiscOS
  34  * messes up if we don't
  35  */
  36 #define proc_hard_reset()       cpu_proc_fin()
  37
  38 #endif
  39
  40 struct pt_regs;
  41
  42 void die(const char *msg, struct pt_regs *regs, int err)
  43                 __attribute__((noreturn));
  44
  45 void die_if_kernel(const char *str, struct pt_regs *regs, int err);
  46
  47 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  48                                        struct pt_regs *),
  49                      int sig, const char *name);
  50
  51 #include <asm/proc-fns.h>
  52
  53 #define xchg(ptr,x) \
  54         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
  55
  56 #define tas(ptr) (xchg((ptr),1))
  57
  58 extern asmlinkage void __backtrace(void);
  59
  60 #define set_cr(x)                                       \
  61         __asm__ __volatile__(                           \
  62         "mcr    p15, 0, %0, c1, c0, 0   @ set CR"       \
  63         : : "r" (x) : "cc")
  64
  65 #define get_cr()                                        \
  66         ({                                              \
  67         unsigned int __val;                             \
  68         __asm__ __volatile__(                           \
  69         "mrc    p15, 0, %0, c1, c0, 0   @ get CR"       \
  70         : "=r" (__val) : : "cc");                       \
  71         __val;                                          \
  72         })
  73
  74 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
  75 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
  76
  77 #define UDBG_UNDEFINED  (1 << 0)
  78 #define UDBG_SYSCALL    (1 << 1)
  79 #define UDBG_BADABORT   (1 << 2)
  80 #define UDBG_SEGV       (1 << 3)
  81 #define UDBG_BUS        (1 << 4)
  82
  83 extern unsigned int user_debug;
  84
  85 #define vectors_base()  (0)
  86
  87 #define mb() __asm__ __volatile__ ("" : : : "memory")
  88 #define rmb() mb()
  89 #define wmb() mb()
  90 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
  91
  92 #define read_barrier_depends() do { } while(0)
  93 #define set_mb(var, value)  do { var = value; mb(); } while (0)
  94 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
  95
  96 /*
  97  * We assume knowledge of how
  98  * spin_unlock_irq() and friends are implemented.  This avoids
  99  * us needlessly decrementing and incrementing the preempt count.
 100  */
 101 #define prepare_arch_switch(rq,next)    local_irq_enable()
 102 #define finish_arch_switch(rq,prev)     spin_unlock(&(rq)->lock)
 103 #define task_running(rq,p)              ((rq)->curr == (p))
 104
 105 /*
 106  * switch_to(prev, next) should switch from task `prev' to `next'
 107  * `prev' will never be the same as `next'.  schedule() itself
 108  * contains the memory barrier to tell GCC not to cache `current'.
 109  */
 110 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
 111
 112 #define switch_to(prev,next,last)                                       \
 113 do {                                                                    \
 114         last = __switch_to(prev,task_thread_info(prev),task_thread_info(next)); \
 115 } while (0)
 116
 117 /*
 118  * On SMP systems, when the scheduler does migration-cost autodetection,
 119  * it needs a way to flush as much of the CPU's caches as possible.
 120  *
 121  * TODO: fill this in!
 122  */
 123 static inline void sched_cacheflush(void)
 124 {
 125 }
 126
 127 /*
 128  * Save the current interrupt enable state & disable IRQs
 129  */
 130 #define local_irq_save(x)                               \
 131         do {                                            \
 132           unsigned long temp;                           \
 133           __asm__ __volatile__(                         \
 134 "       mov     %0, pc          @ save_flags_cli\n"     \
 135 "       orr     %1, %0, #0x08000000\n"                  \
 136 "       and     %0, %0, #0x0c000000\n"                  \
 137 "       teqp    %1, #0\n"                               \
 138           : "=r" (x), "=r" (temp)                       \
 139           :                                             \
 140           : "memory");                                  \
 141         } while (0)
 142
 143 /*
 144  * Enable IRQs  (sti)
 145  */
 146 #define local_irq_enable()                                      \
 147         do {                                    \
 148           unsigned long temp;                   \
 149           __asm__ __volatile__(                 \
 150 "       mov     %0, pc          @ sti\n"        \
 151 "       bic     %0, %0, #0x08000000\n"          \
 152 "       teqp    %0, #0\n"                       \
 153           : "=r" (temp)                         \
 154           :                                     \
 155           : "memory");                          \
 156         } while(0)
 157
 158 /*
 159  * Disable IRQs (cli)
 160  */
 161 #define local_irq_disable()                                     \
 162         do {                                    \
 163           unsigned long temp;                   \
 164           __asm__ __volatile__(                 \
 165 "       mov     %0, pc          @ cli\n"        \
 166 "       orr     %0, %0, #0x08000000\n"          \
 167 "       teqp    %0, #0\n"                       \
 168           : "=r" (temp)                         \
 169           :                                     \
 170           : "memory");                          \
 171         } while(0)
 172
 173 /* Enable FIQs (stf) */
 174
 175 #define __stf() do {                            \
 176         unsigned long temp;                     \
 177         __asm__ __volatile__(                   \
 178 "       mov     %0, pc          @ stf\n"        \
 179 "       bic     %0, %0, #0x04000000\n"          \
 180 "       teqp    %0, #0\n"                       \
 181         : "=r" (temp));                         \
 182     } while(0)
 183
 184 /* Disable FIQs  (clf) */
 185
 186 #define __clf() do {                            \
 187         unsigned long temp;                     \
 188         __asm__ __volatile__(                   \
 189 "       mov     %0, pc          @ clf\n"        \
 190 "       orr     %0, %0, #0x04000000\n"          \
 191 "       teqp    %0, #0\n"                       \
 192         : "=r" (temp));                         \
 193     } while(0)
 194
 195
 196 /*
 197  * Save the current interrupt enable state.
 198  */
 199 #define local_save_flags(x)                             \
 200         do {                                    \
 201           __asm__ __volatile__(                 \
 202 "       mov     %0, pc          @ save_flags\n" \
 203 "       and     %0, %0, #0x0c000000\n"          \
 204           : "=r" (x));                          \
 205         } while (0)
 206
 207
 208 /*
 209  * restore saved IRQ & FIQ state
 210  */
 211 #define local_irq_restore(x)                            \
 212         do {                                            \
 213           unsigned long temp;                           \
 214           __asm__ __volatile__(                         \
 215 "       mov     %0, pc          @ restore_flags\n"      \
 216 "       bic     %0, %0, #0x0c000000\n"                  \
 217 "       orr     %0, %0, %1\n"                           \
 218 "       teqp    %0, #0\n"                               \
 219           : "=&r" (temp)                                \
 220           : "r" (x)                                     \
 221           : "memory");                                  \
 222         } while (0)
 223
 224
 225 #ifdef CONFIG_SMP
 226 #error SMP not supported
 227 #endif
 228
 229 #define smp_mb()                barrier()
 230 #define smp_rmb()               barrier()
 231 #define smp_wmb()               barrier()
 232 #define smp_read_barrier_depends()              do { } while(0)
 233
 234 #define clf()                   __clf()
 235 #define stf()                   __stf()
 236
 237 #define irqs_disabled()                 \
 238 ({                                      \
 239         unsigned long flags;            \
 240         local_save_flags(flags);        \
 241         flags & PSR_I_BIT;              \
 242 })
 243
 244 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
 245 {
 246         extern void __bad_xchg(volatile void *, int);
 247
 248         switch (size) {
 249                 case 1: return cpu_xchg_1(x, ptr);
 250                 case 4: return cpu_xchg_4(x, ptr);
 251                 default: __bad_xchg(ptr, size);
 252         }
 253         return 0;
 254 }
 255
 256 #endif /* __ASSEMBLY__ */
 257
 258 #define arch_align_stack(x) (x)
 259
 260 #endif /* __KERNEL__ */
 261
 262 #endif