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/stringify.h>
  79 #include <linux/irqflags.h>
  80
  81 /*
  82  * The CPU ID never changes at run time, so we might as well tell the
  83  * compiler that it's constant.  Use this function to read the CPU ID
  84  * rather than directly reading processor_id or read_cpuid() directly.
  85  */
  86 static inline unsigned int read_cpuid_id(void) __attribute_const__;
  87
  88 static inline unsigned int read_cpuid_id(void)
  89 {
  90         return read_cpuid(CPUID_ID);
  91 }
  92
  93 #define __exception     __attribute__((section(".exception.text")))
  94
  95 struct thread_info;
  96 struct task_struct;
  97
  98 /* information about the system we're running on */
  99 extern unsigned int system_rev;
 100 extern unsigned int system_serial_low;
 101 extern unsigned int system_serial_high;
 102 extern unsigned int mem_fclk_21285;
 103
 104 struct pt_regs;
 105
 106 void die(const char *msg, struct pt_regs *regs, int err)
 107                 __attribute__((noreturn));
 108
 109 struct siginfo;
 110 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
 111                 unsigned long err, unsigned long trap);
 112
 113 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 114                                        struct pt_regs *),
 115                      int sig, const char *name);
 116
 117 #define xchg(ptr,x) \
 118         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
 119
 120 extern asmlinkage void __backtrace(void);
 121 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
 122
 123 struct mm_struct;
 124 extern void show_pte(struct mm_struct *mm, unsigned long addr);
 125 extern void __show_regs(struct pt_regs *);
 126
 127 extern int cpu_architecture(void);
 128 extern void cpu_init(void);
 129
 130 void arm_machine_restart(char mode);
 131 extern void (*arm_pm_restart)(char str);
 132
 133 /*
 134  * Intel's XScale3 core supports some v6 features (supersections, L2)
 135  * but advertises itself as v5 as it does not support the v6 ISA.  For
 136  * this reason, we need a way to explicitly test for this type of CPU.
 137  */
 138 #ifndef CONFIG_CPU_XSC3
 139 #define cpu_is_xsc3()   0
 140 #else
 141 static inline int cpu_is_xsc3(void)
 142 {
 143         extern unsigned int processor_id;
 144
 145         if ((processor_id & 0xffffe000) == 0x69056000)
 146                 return 1;
 147
 148         return 0;
 149 }
 150 #endif
 151
 152 #if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
 153 #define cpu_is_xscale() 0
 154 #else
 155 #define cpu_is_xscale() 1
 156 #endif
 157
 158 #define UDBG_UNDEFINED  (1 << 0)
 159 #define UDBG_SYSCALL    (1 << 1)
 160 #define UDBG_BADABORT   (1 << 2)
 161 #define UDBG_SEGV       (1 << 3)
 162 #define UDBG_BUS        (1 << 4)
 163
 164 extern unsigned int user_debug;
 165
 166 #if __LINUX_ARM_ARCH__ >= 4
 167 #define vectors_high()  (cr_alignment & CR_V)
 168 #else
 169 #define vectors_high()  (0)
 170 #endif
 171
 172 #if __LINUX_ARM_ARCH__ >= 7
 173 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
 174 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
 175 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
 176 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
 177 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
 178                                     : : "r" (0) : "memory")
 179 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 180                                     : : "r" (0) : "memory")
 181 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
 182                                     : : "r" (0) : "memory")
 183 #else
 184 #define isb() __asm__ __volatile__ ("" : : : "memory")
 185 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
 186                                     : : "r" (0) : "memory")
 187 #define dmb() __asm__ __volatile__ ("" : : : "memory")
 188 #endif
 189
 190 #ifndef CONFIG_SMP
 191 #define mb()    do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 192 #define rmb()   do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 193 #define wmb()   do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
 194 #define smp_mb()        barrier()
 195 #define smp_rmb()       barrier()
 196 #define smp_wmb()       barrier()
 197 #else
 198 #define mb()            dmb()
 199 #define rmb()           dmb()
 200 #define wmb()           dmb()
 201 #define smp_mb()        dmb()
 202 #define smp_rmb()       dmb()
 203 #define smp_wmb()       dmb()
 204 #endif
 205 #define read_barrier_depends()          do { } while(0)
 206 #define smp_read_barrier_depends()      do { } while(0)
 207
 208 #define set_mb(var, value)      do { var = value; smp_mb(); } while (0)
 209 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 210
 211 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
 212 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
 213
 214 static inline unsigned int get_cr(void)
 215 {
 216         unsigned int val;
 217         asm("mrc p15, 0, %0, c1, c0, 0  @ get CR" : "=r" (val) : : "cc");
 218         return val;
 219 }
 220
 221 static inline void set_cr(unsigned int val)
 222 {
 223         asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
 224           : : "r" (val) : "cc");
 225         isb();
 226 }
 227
 228 #ifndef CONFIG_SMP
 229 extern void adjust_cr(unsigned long mask, unsigned long set);
 230 #endif
 231
 232 #define CPACC_FULL(n)           (3 << (n * 2))
 233 #define CPACC_SVC(n)            (1 << (n * 2))
 234 #define CPACC_DISABLE(n)        (0 << (n * 2))
 235
 236 static inline unsigned int get_copro_access(void)
 237 {
 238         unsigned int val;
 239         asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
 240           : "=r" (val) : : "cc");
 241         return val;
 242 }
 243
 244 static inline void set_copro_access(unsigned int val)
 245 {
 246         asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
 247           : : "r" (val) : "cc");
 248         isb();
 249 }
 250
 251 /*
 252  * switch_mm() may do a full cache flush over the context switch,
 253  * so enable interrupts over the context switch to avoid high
 254  * latency.
 255  */
 256 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
 257
 258 /*
 259  * switch_to(prev, next) should switch from task `prev' to `next'
 260  * `prev' will never be the same as `next'.  schedule() itself
 261  * contains the memory barrier to tell GCC not to cache `current'.
 262  */
 263 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
 264
 265 #define switch_to(prev,next,last)                                       \
 266 do {                                                                    \
 267         last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));        \
 268 } while (0)
 269
 270 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
 271 /*
 272  * On the StrongARM, "swp" is terminally broken since it bypasses the
 273  * cache totally.  This means that the cache becomes inconsistent, and,
 274  * since we use normal loads/stores as well, this is really bad.
 275  * Typically, this causes oopsen in filp_close, but could have other,
 276  * more disasterous effects.  There are two work-arounds:
 277  *  1. Disable interrupts and emulate the atomic swap
 278  *  2. Clean the cache, perform atomic swap, flush the cache
 279  *
 280  * We choose (1) since its the "easiest" to achieve here and is not
 281  * dependent on the processor type.
 282  *
 283  * NOTE that this solution won't work on an SMP system, so explcitly
 284  * forbid it here.
 285  */
 286 #define swp_is_buggy
 287 #endif
 288
 289 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
 290 {
 291         extern void __bad_xchg(volatile void *, int);
 292         unsigned long ret;
 293 #ifdef swp_is_buggy
 294         unsigned long flags;
 295 #endif
 296 #if __LINUX_ARM_ARCH__ >= 6
 297         unsigned int tmp;
 298 #endif
 299
 300         switch (size) {
 301 #if __LINUX_ARM_ARCH__ >= 6
 302         case 1:
 303                 asm volatile("@ __xchg1\n"
 304                 "1:     ldrexb  %0, [%3]\n"
 305                 "       strexb  %1, %2, [%3]\n"
 306                 "       teq     %1, #0\n"
 307                 "       bne     1b"
 308                         : "=&r" (ret), "=&r" (tmp)
 309                         : "r" (x), "r" (ptr)
 310                         : "memory", "cc");
 311                 break;
 312         case 4:
 313                 asm volatile("@ __xchg4\n"
 314                 "1:     ldrex   %0, [%3]\n"
 315                 "       strex   %1, %2, [%3]\n"
 316                 "       teq     %1, #0\n"
 317                 "       bne     1b"
 318                         : "=&r" (ret), "=&r" (tmp)
 319                         : "r" (x), "r" (ptr)
 320                         : "memory", "cc");
 321                 break;
 322 #elif defined(swp_is_buggy)
 323 #ifdef CONFIG_SMP
 324 #error SMP is not supported on this platform
 325 #endif
 326         case 1:
 327                 raw_local_irq_save(flags);
 328                 ret = *(volatile unsigned char *)ptr;
 329                 *(volatile unsigned char *)ptr = x;
 330                 raw_local_irq_restore(flags);
 331                 break;
 332
 333         case 4:
 334                 raw_local_irq_save(flags);
 335                 ret = *(volatile unsigned long *)ptr;
 336                 *(volatile unsigned long *)ptr = x;
 337                 raw_local_irq_restore(flags);
 338                 break;
 339 #else
 340         case 1:
 341                 asm volatile("@ __xchg1\n"
 342                 "       swpb    %0, %1, [%2]"
 343                         : "=&r" (ret)
 344                         : "r" (x), "r" (ptr)
 345                         : "memory", "cc");
 346                 break;
 347         case 4:
 348                 asm volatile("@ __xchg4\n"
 349                 "       swp     %0, %1, [%2]"
 350                         : "=&r" (ret)
 351                         : "r" (x), "r" (ptr)
 352                         : "memory", "cc");
 353                 break;
 354 #endif
 355         default:
 356                 __bad_xchg(ptr, size), ret = 0;
 357                 break;
 358         }
 359
 360         return ret;
 361 }
 362
 363 extern void disable_hlt(void);
 364 extern void enable_hlt(void);
 365
 366 #endif /* __ASSEMBLY__ */
 367
 368 #define arch_align_stack(x) (x)
 369
 370 #endif /* __KERNEL__ */
 371
 372 #endif