include/asm-arm/system.h

   1 #ifndef __ASM_ARM_SYSTEM_H
   2 #define __ASM_ARM_SYSTEM_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <asm/memory.h>
   7
   8 #define CPU_ARCH_UNKNOWN        0
   9 #define CPU_ARCH_ARMv3          1
  10 #define CPU_ARCH_ARMv4          2
  11 #define CPU_ARCH_ARMv4T         3
  12 #define CPU_ARCH_ARMv5          4
  13 #define CPU_ARCH_ARMv5T         5
  14 #define CPU_ARCH_ARMv5TE        6
  15 #define CPU_ARCH_ARMv5TEJ       7
  16 #define CPU_ARCH_ARMv6          8
  17 #define CPU_ARCH_ARMv7          9
  18
  19 /*
  20  * CR1 bits (CP#15 CR1)
  21  */
  22 #define CR_M    (1 << 0)        /* MMU enable                           */
  23 #define CR_A    (1 << 1)        /* Alignment abort enable               */
  24 #define CR_C    (1 << 2)        /* Dcache enable                        */
  25 #define CR_W    (1 << 3)        /* Write buffer enable                  */
  26 #define CR_P    (1 << 4)        /* 32-bit exception handler             */
  27 #define CR_D    (1 << 5)        /* 32-bit data address range            */
  28 #define CR_L    (1 << 6)        /* Implementation defined               */
  29 #define CR_B    (1 << 7)        /* Big endian                           */
  30 #define CR_S    (1 << 8)        /* System MMU protection                */
  31 #define CR_R    (1 << 9)        /* ROM MMU protection                   */
  32 #define CR_F    (1 << 10)       /* Implementation defined               */
  33 #define CR_Z    (1 << 11)       /* Implementation defined               */
  34 #define CR_I    (1 << 12)       /* Icache enable                        */
  35 #define CR_V    (1 << 13)       /* Vectors relocated to 0xffff0000      */
  36 #define CR_RR   (1 << 14)       /* Round Robin cache replacement        */
  37 #define CR_L4   (1 << 15)       /* LDR pc can set T bit                 */
  38 #define CR_DT   (1 << 16)
  39 #define CR_IT   (1 << 18)
  40 #define CR_ST   (1 << 19)
  41 #define CR_FI   (1 << 21)       /* Fast interrupt (lower latency mode)  */
  42 #define CR_U    (1 << 22)       /* Unaligned access operation           */
  43 #define CR_XP   (1 << 23)       /* Extended page tables                 */
  44 #define CR_VE   (1 << 24)       /* Vectored interrupts                  */
  45
  46 #define CPUID_ID        0
  47 #define CPUID_CACHETYPE 1
  48 #define CPUID_TCM       2
  49 #define CPUID_TLBTYPE   3
  50
  51 #ifdef CONFIG_CPU_CP15
  52 #define read_cpuid(reg)                                                 \
  53         ({                                                              \
  54                 unsigned int __val;                                     \
  55                 asm("mrc        p15, 0, %0, c0, c0, " __stringify(reg)  \
  56                     : "=r" (__val)                                      \
  57                     :                                                   \
  58                     : "cc");                                            \
  59                 __val;                                                  \
  60         })
  61 #else
  62 #define read_cpuid(reg) (processor_id)
  63 #endif
  64
  65 /*
  66  * This is used to ensure the compiler did actually allocate the register we
  67  * asked it for some inline assembly sequences.  Apparently we can't trust
  68  * the compiler from one version to another so a bit of paranoia won't hurt.
  69  * This string is meant to be concatenated with the inline asm string and
  70  * will cause compilation to stop on mismatch.
  71  * (for details, see gcc PR 15089)
  72  */
  73 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
  74
  75 #ifndef __ASSEMBLY__
  76
  77 #include <linux/linkage.h>
  78 #include <linux/irqflags.h>
  79
  80 #define __exception     __attribute__((section(".exception.text")))
  81
  82 struct thread_info;
  83 struct task_struct;
  84
  85 /* information about the system we're running on */
  86 extern unsigned int system_rev;
  87 extern unsigned int system_serial_low;
  88 extern unsigned int system_serial_high;
  89 extern unsigned int mem_fclk_21285;
  90
  91 struct pt_regs;
  92
  93 void die(const char *msg, struct pt_regs *regs, int err)
  94                 __attribute__((noreturn));
  95
  96 struct siginfo;
  97 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
  98                 unsigned long err, unsigned long trap);
  99
 100 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 101                                        struct pt_regs *),
 102                      int sig, const char *name);
 103
 104 #define xchg(ptr,x) \
 105         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
 106
 107 extern asmlinkage void __backtrace(void);
 108 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
 109
 110 struct mm_struct;
 111 extern void show_pte(struct mm_struct *mm, unsigned long addr);
 112 extern void __show_regs(struct pt_regs *);
 113
 114 extern int cpu_architecture(void);
 115 extern void cpu_init(void);
 116
 117 void arm_machine_restart(char mode);
 118 extern void (*arm_pm_restart)(char str);
 119
 120 /*
 121  * Intel's XScale3 core supports some v6 features (supersections, L2)
 122  * but advertises itself as v5 as it does not support the v6 ISA.  For
 123  * this reason, we need a way to explicitly test for this type of CPU.
 124  */
 125 #ifndef CONFIG_CPU_XSC3
 126 #define cpu_is_xsc3()   0
 127 #else
 128 static inline int cpu_is_xsc3(void)
 129 {
 130         extern unsigned int processor_id;
 131
 132         if ((processor_id & 0xffffe000) == 0x69056000)
 133                 return 1;
 134
 135         return 0;
 136 }
 137 #endif
 138
 139 #if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
 140 #define cpu_is_xscale() 0
 141 #else
 142 #define cpu_is_xscale() 1
 143 #endif
 144
 145 #define UDBG_UNDEFINED  (1 << 0)
 146 #define UDBG_SYSCALL    (1 << 1)
 147 #define UDBG_BADABORT   (1 << 2)
 148 #define UDBG_SEGV       (1 << 3)
 149 #define UDBG_BUS        (1 << 4)
 150
 151 extern unsigned int user_debug;
 152
 153 #if __LINUX_ARM_ARCH__ >= 4
 154 #define vectors_high()  (cr_alignment & CR_V)
 155 #else
 156 #define vectors_high()  (0)
 157 #endif
 158
 159 #if __LINUX_ARM_ARCH__ >= 7
 160 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
 161 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
 162 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
 163 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
 164 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
 165                                     : : "r" (0) : "memory")
 166 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 167                                     : : "r" (0) : "memory")
 168 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
 169                                     : : "r" (0) : "memory")
 170 #else
 171 #define isb() __asm__ __volatile__ ("" : : : "memory")
 172 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 173                                     : : "r" (0) : "memory")
 174 #define dmb() __asm__ __volatile__ ("" : : : "memory")
 175 #endif
 176
 177 #ifndef CONFIG_SMP
 178 #define mb()    do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 179 #define rmb()   do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 180 #define wmb()   do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 181 #define smp_mb()        barrier()
 182 #define smp_rmb()       barrier()
 183 #define smp_wmb()       barrier()
 184 #else
 185 #define mb()            dmb()
 186 #define rmb()           dmb()
 187 #define wmb()           dmb()
 188 #define smp_mb()        dmb()
 189 #define smp_rmb()       dmb()
 190 #define smp_wmb()       dmb()
 191 #endif
 192 #define read_barrier_depends()          do { } while(0)
 193 #define smp_read_barrier_depends()      do { } while(0)
 194
 195 #define set_mb(var, value)      do { var = value; smp_mb(); } while (0)
 196 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 197
 198 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
 199 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
 200
 201 static inline unsigned int get_cr(void)
 202 {
 203         unsigned int val;
 204         asm("mrc p15, 0, %0, c1, c0, 0  @ get CR" : "=r" (val) : : "cc");
 205         return val;
 206 }
 207
 208 static inline void set_cr(unsigned int val)
 209 {
 210         asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
 211           : : "r" (val) : "cc");
 212         isb();
 213 }
 214
 215 #ifndef CONFIG_SMP
 216 extern void adjust_cr(unsigned long mask, unsigned long set);
 217 #endif
 218
 219 #define CPACC_FULL(n)           (3 << (n * 2))
 220 #define CPACC_SVC(n)            (1 << (n * 2))
 221 #define CPACC_DISABLE(n)        (0 << (n * 2))
 222
 223 static inline unsigned int get_copro_access(void)
 224 {
 225         unsigned int val;
 226         asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
 227           : "=r" (val) : : "cc");
 228         return val;
 229 }
 230
 231 static inline void set_copro_access(unsigned int val)
 232 {
 233         asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
 234           : : "r" (val) : "cc");
 235         isb();
 236 }
 237
 238 /*
 239  * switch_mm() may do a full cache flush over the context switch,
 240  * so enable interrupts over the context switch to avoid high
 241  * latency.
 242  */
 243 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
 244
 245 /*
 246  * switch_to(prev, next) should switch from task `prev' to `next'
 247  * `prev' will never be the same as `next'.  schedule() itself
 248  * contains the memory barrier to tell GCC not to cache `current'.
 249  */
 250 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
 251
 252 #define switch_to(prev,next,last)                                       \
 253 do {                                                                    \
 254         last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));        \
 255 } while (0)
 256
 257 /*
 258  * On SMP systems, when the scheduler does migration-cost autodetection,
 259  * it needs a way to flush as much of the CPU's caches as possible.
 260  *
 261  * TODO: fill this in!
 262  */
 263 static inline void sched_cacheflush(void)
 264 {
 265 }
 266
 267 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
 268 /*
 269  * On the StrongARM, "swp" is terminally broken since it bypasses the
 270  * cache totally.  This means that the cache becomes inconsistent, and,
 271  * since we use normal loads/stores as well, this is really bad.
 272  * Typically, this causes oopsen in filp_close, but could have other,
 273  * more disasterous effects.  There are two work-arounds:
 274  *  1. Disable interrupts and emulate the atomic swap
 275  *  2. Clean the cache, perform atomic swap, flush the cache
 276  *
 277  * We choose (1) since its the "easiest" to achieve here and is not
 278  * dependent on the processor type.
 279  *
 280  * NOTE that this solution won't work on an SMP system, so explcitly
 281  * forbid it here.
 282  */
 283 #define swp_is_buggy
 284 #endif
 285
 286 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
 287 {
 288         extern void __bad_xchg(volatile void *, int);
 289         unsigned long ret;
 290 #ifdef swp_is_buggy
 291         unsigned long flags;
 292 #endif
 293 #if __LINUX_ARM_ARCH__ >= 6
 294         unsigned int tmp;
 295 #endif
 296
 297         switch (size) {
 298 #if __LINUX_ARM_ARCH__ >= 6
 299         case 1:
 300                 asm volatile("@ __xchg1\n"
 301                 "1:     ldrexb  %0, [%3]\n"
 302                 "       strexb  %1, %2, [%3]\n"
 303                 "       teq     %1, #0\n"
 304                 "       bne     1b"
 305                         : "=&r" (ret), "=&r" (tmp)
 306                         : "r" (x), "r" (ptr)
 307                         : "memory", "cc");
 308                 break;
 309         case 4:
 310                 asm volatile("@ __xchg4\n"
 311                 "1:     ldrex   %0, [%3]\n"
 312                 "       strex   %1, %2, [%3]\n"
 313                 "       teq     %1, #0\n"
 314                 "       bne     1b"
 315                         : "=&r" (ret), "=&r" (tmp)
 316                         : "r" (x), "r" (ptr)
 317                         : "memory", "cc");
 318                 break;
 319 #elif defined(swp_is_buggy)
 320 #ifdef CONFIG_SMP
 321 #error SMP is not supported on this platform
 322 #endif
 323         case 1:
 324                 raw_local_irq_save(flags);
 325                 ret = *(volatile unsigned char *)ptr;
 326                 *(volatile unsigned char *)ptr = x;
 327                 raw_local_irq_restore(flags);
 328                 break;
 329
 330         case 4:
 331                 raw_local_irq_save(flags);
 332                 ret = *(volatile unsigned long *)ptr;
 333                 *(volatile unsigned long *)ptr = x;
 334                 raw_local_irq_restore(flags);
 335                 break;
 336 #else
 337         case 1:
 338                 asm volatile("@ __xchg1\n"
 339                 "       swpb    %0, %1, [%2]"
 340                         : "=&r" (ret)
 341                         : "r" (x), "r" (ptr)
 342                         : "memory", "cc");
 343                 break;
 344         case 4:
 345                 asm volatile("@ __xchg4\n"
 346                 "       swp     %0, %1, [%2]"
 347                         : "=&r" (ret)
 348                         : "r" (x), "r" (ptr)
 349                         : "memory", "cc");
 350                 break;
 351 #endif
 352         default:
 353                 __bad_xchg(ptr, size), ret = 0;
 354                 break;
 355         }
 356
 357         return ret;
 358 }
 359
 360 extern void disable_hlt(void);
 361 extern void enable_hlt(void);
 362
 363 #endif /* __ASSEMBLY__ */
 364
 365 #define arch_align_stack(x) (x)
 366
 367 #endif /* __KERNEL__ */
 368
 369 #endif