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   1 #ifndef __ASM_ARM_SYSTEM_H
   2 #define __ASM_ARM_SYSTEM_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/config.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
  18 /*
  19  * CR1 bits (CP#15 CR1)
  20  */
  21 #define CR_M    (1 << 0)        /* MMU enable                           */
  22 #define CR_A    (1 << 1)        /* Alignment abort enable               */
  23 #define CR_C    (1 << 2)        /* Dcache enable                        */
  24 #define CR_W    (1 << 3)        /* Write buffer enable                  */
  25 #define CR_P    (1 << 4)        /* 32-bit exception handler             */
  26 #define CR_D    (1 << 5)        /* 32-bit data address range            */
  27 #define CR_L    (1 << 6)        /* Implementation defined               */
  28 #define CR_B    (1 << 7)        /* Big endian                           */
  29 #define CR_S    (1 << 8)        /* System MMU protection                */
  30 #define CR_R    (1 << 9)        /* ROM MMU protection                   */
  31 #define CR_F    (1 << 10)       /* Implementation defined               */
  32 #define CR_Z    (1 << 11)       /* Implementation defined               */
  33 #define CR_I    (1 << 12)       /* Icache enable                        */
  34 #define CR_V    (1 << 13)       /* Vectors relocated to 0xffff0000      */
  35 #define CR_RR   (1 << 14)       /* Round Robin cache replacement        */
  36 #define CR_L4   (1 << 15)       /* LDR pc can set T bit                 */
  37 #define CR_DT   (1 << 16)
  38 #define CR_IT   (1 << 18)
  39 #define CR_ST   (1 << 19)
  40 #define CR_FI   (1 << 21)       /* Fast interrupt (lower latency mode)  */
  41 #define CR_U    (1 << 22)       /* Unaligned access operation           */
  42 #define CR_XP   (1 << 23)       /* Extended page tables                 */
  43 #define CR_VE   (1 << 24)       /* Vectored interrupts                  */
  44
  45 #define CPUID_ID        0
  46 #define CPUID_CACHETYPE 1
  47 #define CPUID_TCM       2
  48 #define CPUID_TLBTYPE   3
  49
  50 #define read_cpuid(reg)                                                 \
  51         ({                                                              \
  52                 unsigned int __val;                                     \
  53                 asm("mrc        p15, 0, %0, c0, c0, " __stringify(reg)  \
  54                     : "=r" (__val)                                      \
  55                     :                                                   \
  56                     : "cc");                                            \
  57                 __val;                                                  \
  58         })
  59
  60 /*
  61  * This is used to ensure the compiler did actually allocate the register we
  62  * asked it for some inline assembly sequences.  Apparently we can't trust
  63  * the compiler from one version to another so a bit of paranoia won't hurt.
  64  * This string is meant to be concatenated with the inline asm string and
  65  * will cause compilation to stop on mismatch.
  66  * (for details, see gcc PR 15089)
  67  */
  68 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
  69
  70 #ifndef __ASSEMBLY__
  71
  72 #include <linux/linkage.h>
  73
  74 struct thread_info;
  75 struct task_struct;
  76
  77 /* information about the system we're running on */
  78 extern unsigned int system_rev;
  79 extern unsigned int system_serial_low;
  80 extern unsigned int system_serial_high;
  81 extern unsigned int mem_fclk_21285;
  82
  83 struct pt_regs;
  84
  85 void die(const char *msg, struct pt_regs *regs, int err)
  86                 __attribute__((noreturn));
  87
  88 void die_if_kernel(const char *str, struct pt_regs *regs, int err);
  89
  90 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  91                                        struct pt_regs *),
  92                      int sig, const char *name);
  93
  94 #include <asm/proc-fns.h>
  95
  96 #define xchg(ptr,x) \
  97         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
  98
  99 #define tas(ptr) (xchg((ptr),1))
 100
 101 extern asmlinkage void __backtrace(void);
 102 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
 103 extern void show_pte(struct mm_struct *mm, unsigned long addr);
 104 extern void __show_regs(struct pt_regs *);
 105
 106 extern int cpu_architecture(void);
 107 extern void cpu_init(void);
 108
 109 #define set_cr(x)                                       \
 110         __asm__ __volatile__(                           \
 111         "mcr    p15, 0, %0, c1, c0, 0   @ set CR"       \
 112         : : "r" (x) : "cc")
 113
 114 #define get_cr()                                        \
 115         ({                                              \
 116         unsigned int __val;                             \
 117         __asm__ __volatile__(                           \
 118         "mrc    p15, 0, %0, c1, c0, 0   @ get CR"       \
 119         : "=r" (__val) : : "cc");                       \
 120         __val;                                          \
 121         })
 122
 123 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
 124 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
 125
 126 #define UDBG_UNDEFINED  (1 << 0)
 127 #define UDBG_SYSCALL    (1 << 1)
 128 #define UDBG_BADABORT   (1 << 2)
 129 #define UDBG_SEGV       (1 << 3)
 130 #define UDBG_BUS        (1 << 4)
 131
 132 extern unsigned int user_debug;
 133
 134 #if __LINUX_ARM_ARCH__ >= 4
 135 #define vectors_high()  (cr_alignment & CR_V)
 136 #else
 137 #define vectors_high()  (0)
 138 #endif
 139
 140 #define mb() __asm__ __volatile__ ("" : : : "memory")
 141 #define rmb() mb()
 142 #define wmb() mb()
 143 #define read_barrier_depends() do { } while(0)
 144 #define set_mb(var, value)  do { var = value; mb(); } while (0)
 145 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
 146 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 147
 148 /*
 149  * switch_mm() may do a full cache flush over the context switch,
 150  * so enable interrupts over the context switch to avoid high
 151  * latency.
 152  */
 153 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
 154
 155 /*
 156  * switch_to(prev, next) should switch from task `prev' to `next'
 157  * `prev' will never be the same as `next'.  schedule() itself
 158  * contains the memory barrier to tell GCC not to cache `current'.
 159  */
 160 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
 161
 162 #define switch_to(prev,next,last)                                       \
 163 do {                                                                    \
 164         last = __switch_to(prev,prev->thread_info,next->thread_info);   \
 165 } while (0)
 166
 167 /*
 168  * CPU interrupt mask handling.
 169  */
 170 #if __LINUX_ARM_ARCH__ >= 6
 171
 172 #define local_irq_save(x)                                       \
 173         ({                                                      \
 174         __asm__ __volatile__(                                   \
 175         "mrs    %0, cpsr                @ local_irq_save\n"     \
 176         "cpsid  i"                                              \
 177         : "=r" (x) : : "memory", "cc");                         \
 178         })
 179
 180 #define local_irq_enable()  __asm__("cpsie i    @ __sti" : : : "memory", "cc")
 181 #define local_irq_disable() __asm__("cpsid i    @ __cli" : : : "memory", "cc")
 182 #define local_fiq_enable()  __asm__("cpsie f    @ __stf" : : : "memory", "cc")
 183 #define local_fiq_disable() __asm__("cpsid f    @ __clf" : : : "memory", "cc")
 184
 185 #else
 186
 187 /*
 188  * Save the current interrupt enable state & disable IRQs
 189  */
 190 #define local_irq_save(x)                                       \
 191         ({                                                      \
 192                 unsigned long temp;                             \
 193                 (void) (&temp == &x);                           \
 194         __asm__ __volatile__(                                   \
 195         "mrs    %0, cpsr                @ local_irq_save\n"     \
 196 "       orr     %1, %0, #128\n"                                 \
 197 "       msr     cpsr_c, %1"                                     \
 198         : "=r" (x), "=r" (temp)                                 \
 199         :                                                       \
 200         : "memory", "cc");                                      \
 201         })
 202
 203 /*
 204  * Enable IRQs
 205  */
 206 #define local_irq_enable()                                      \
 207         ({                                                      \
 208                 unsigned long temp;                             \
 209         __asm__ __volatile__(                                   \
 210         "mrs    %0, cpsr                @ local_irq_enable\n"   \
 211 "       bic     %0, %0, #128\n"                                 \
 212 "       msr     cpsr_c, %0"                                     \
 213         : "=r" (temp)                                           \
 214         :                                                       \
 215         : "memory", "cc");                                      \
 216         })
 217
 218 /*
 219  * Disable IRQs
 220  */
 221 #define local_irq_disable()                                     \
 222         ({                                                      \
 223                 unsigned long temp;                             \
 224         __asm__ __volatile__(                                   \
 225         "mrs    %0, cpsr                @ local_irq_disable\n"  \
 226 "       orr     %0, %0, #128\n"                                 \
 227 "       msr     cpsr_c, %0"                                     \
 228         : "=r" (temp)                                           \
 229         :                                                       \
 230         : "memory", "cc");                                      \
 231         })
 232
 233 /*
 234  * Enable FIQs
 235  */
 236 #define local_fiq_enable()                                      \
 237         ({                                                      \
 238                 unsigned long temp;                             \
 239         __asm__ __volatile__(                                   \
 240         "mrs    %0, cpsr                @ stf\n"                \
 241 "       bic     %0, %0, #64\n"                                  \
 242 "       msr     cpsr_c, %0"                                     \
 243         : "=r" (temp)                                           \
 244         :                                                       \
 245         : "memory", "cc");                                      \
 246         })
 247
 248 /*
 249  * Disable FIQs
 250  */
 251 #define local_fiq_disable()                                     \
 252         ({                                                      \
 253                 unsigned long temp;                             \
 254         __asm__ __volatile__(                                   \
 255         "mrs    %0, cpsr                @ clf\n"                \
 256 "       orr     %0, %0, #64\n"                                  \
 257 "       msr     cpsr_c, %0"                                     \
 258         : "=r" (temp)                                           \
 259         :                                                       \
 260         : "memory", "cc");                                      \
 261         })
 262
 263 #endif
 264
 265 /*
 266  * Save the current interrupt enable state.
 267  */
 268 #define local_save_flags(x)                                     \
 269         ({                                                      \
 270         __asm__ __volatile__(                                   \
 271         "mrs    %0, cpsr                @ local_save_flags"     \
 272         : "=r" (x) : : "memory", "cc");                         \
 273         })
 274
 275 /*
 276  * restore saved IRQ & FIQ state
 277  */
 278 #define local_irq_restore(x)                                    \
 279         __asm__ __volatile__(                                   \
 280         "msr    cpsr_c, %0              @ local_irq_restore\n"  \
 281         :                                                       \
 282         : "r" (x)                                               \
 283         : "memory", "cc")
 284
 285 #define irqs_disabled()                 \
 286 ({                                      \
 287         unsigned long flags;            \
 288         local_save_flags(flags);        \
 289         (int)(flags & PSR_I_BIT);       \
 290 })
 291
 292 #ifdef CONFIG_SMP
 293
 294 #define smp_mb()                mb()
 295 #define smp_rmb()               rmb()
 296 #define smp_wmb()               wmb()
 297 #define smp_read_barrier_depends()              read_barrier_depends()
 298
 299 #else
 300
 301 #define smp_mb()                barrier()
 302 #define smp_rmb()               barrier()
 303 #define smp_wmb()               barrier()
 304 #define smp_read_barrier_depends()              do { } while(0)
 305
 306 #endif /* CONFIG_SMP */
 307
 308 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
 309 /*
 310  * On the StrongARM, "swp" is terminally broken since it bypasses the
 311  * cache totally.  This means that the cache becomes inconsistent, and,
 312  * since we use normal loads/stores as well, this is really bad.
 313  * Typically, this causes oopsen in filp_close, but could have other,
 314  * more disasterous effects.  There are two work-arounds:
 315  *  1. Disable interrupts and emulate the atomic swap
 316  *  2. Clean the cache, perform atomic swap, flush the cache
 317  *
 318  * We choose (1) since its the "easiest" to achieve here and is not
 319  * dependent on the processor type.
 320  *
 321  * NOTE that this solution won't work on an SMP system, so explcitly
 322  * forbid it here.
 323  */
 324 #ifdef CONFIG_SMP
 325 #error SMP is not supported on SA1100/SA110
 326 #else
 327 #define swp_is_buggy
 328 #endif
 329 #endif
 330
 331 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
 332 {
 333         extern void __bad_xchg(volatile void *, int);
 334         unsigned long ret;
 335 #ifdef swp_is_buggy
 336         unsigned long flags;
 337 #endif
 338
 339         switch (size) {
 340 #ifdef swp_is_buggy
 341                 case 1:
 342                         local_irq_save(flags);
 343                         ret = *(volatile unsigned char *)ptr;
 344                         *(volatile unsigned char *)ptr = x;
 345                         local_irq_restore(flags);
 346                         break;
 347
 348                 case 4:
 349                         local_irq_save(flags);
 350                         ret = *(volatile unsigned long *)ptr;
 351                         *(volatile unsigned long *)ptr = x;
 352                         local_irq_restore(flags);
 353                         break;
 354 #else
 355                 case 1: __asm__ __volatile__ ("swpb %0, %1, [%2]"
 356                                         : "=&r" (ret)
 357                                         : "r" (x), "r" (ptr)
 358                                         : "memory", "cc");
 359                         break;
 360                 case 4: __asm__ __volatile__ ("swp %0, %1, [%2]"
 361                                         : "=&r" (ret)
 362                                         : "r" (x), "r" (ptr)
 363                                         : "memory", "cc");
 364                         break;
 365 #endif
 366                 default: __bad_xchg(ptr, size), ret = 0;
 367         }
 368
 369         return ret;
 370 }
 371
 372 #endif /* __ASSEMBLY__ */
 373
 374 #define arch_align_stack(x) (x)
 375
 376 #endif /* __KERNEL__ */
 377
 378 #endif