1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
6 #define CPU_ARCH_UNKNOWN 0
7 #define CPU_ARCH_ARMv3 1
8 #define CPU_ARCH_ARMv4 2
9 #define CPU_ARCH_ARMv4T 3
10 #define CPU_ARCH_ARMv5 4
11 #define CPU_ARCH_ARMv5T 5
12 #define CPU_ARCH_ARMv5TE 6
13 #define CPU_ARCH_ARMv5TEJ 7
14 #define CPU_ARCH_ARMv6 8
15 #define CPU_ARCH_ARMv7 9
18 * CR1 bits (CP#15 CR1)
20 #define CR_M (1 << 0) /* MMU enable */
21 #define CR_A (1 << 1) /* Alignment abort enable */
22 #define CR_C (1 << 2) /* Dcache enable */
23 #define CR_W (1 << 3) /* Write buffer enable */
24 #define CR_P (1 << 4) /* 32-bit exception handler */
25 #define CR_D (1 << 5) /* 32-bit data address range */
26 #define CR_L (1 << 6) /* Implementation defined */
27 #define CR_B (1 << 7) /* Big endian */
28 #define CR_S (1 << 8) /* System MMU protection */
29 #define CR_R (1 << 9) /* ROM MMU protection */
30 #define CR_F (1 << 10) /* Implementation defined */
31 #define CR_Z (1 << 11) /* Implementation defined */
32 #define CR_I (1 << 12) /* Icache enable */
33 #define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
34 #define CR_RR (1 << 14) /* Round Robin cache replacement */
35 #define CR_L4 (1 << 15) /* LDR pc can set T bit */
36 #define CR_DT (1 << 16)
37 #define CR_IT (1 << 18)
38 #define CR_ST (1 << 19)
39 #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
40 #define CR_U (1 << 22) /* Unaligned access operation */
41 #define CR_XP (1 << 23) /* Extended page tables */
42 #define CR_VE (1 << 24) /* Vectored interrupts */
43 #define CR_EE (1 << 25) /* Exception (Big) Endian */
44 #define CR_TRE (1 << 28) /* TEX remap enable */
45 #define CR_AFE (1 << 29) /* Access flag enable */
46 #define CR_TE (1 << 30) /* Thumb exception enable */
49 * This is used to ensure the compiler did actually allocate the register we
50 * asked it for some inline assembly sequences. Apparently we can't trust
51 * the compiler from one version to another so a bit of paranoia won't hurt.
52 * This string is meant to be concatenated with the inline asm string and
53 * will cause compilation to stop on mismatch.
54 * (for details, see gcc PR 15089)
56 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
60 #include <linux/linkage.h>
61 #include <linux/irqflags.h>
63 #include <asm/outercache.h>
65 #define __exception __attribute__((section(".exception.text")))
70 /* information about the system we're running on */
71 extern unsigned int system_rev;
72 extern unsigned int system_serial_low;
73 extern unsigned int system_serial_high;
74 extern unsigned int mem_fclk_21285;
78 void die(const char *msg, struct pt_regs *regs, int err);
81 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
82 unsigned long err, unsigned long trap);
84 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
86 int sig, int code, const char *name);
88 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
90 int sig, int code, const char *name);
93 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
95 extern asmlinkage void __backtrace(void);
96 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
99 extern void show_pte(struct mm_struct *mm, unsigned long addr);
100 extern void __show_regs(struct pt_regs *);
102 extern int cpu_architecture(void);
103 extern void cpu_init(void);
105 void arm_machine_restart(char mode, const char *cmd);
106 extern void (*arm_pm_restart)(char str, const char *cmd);
108 #define UDBG_UNDEFINED (1 << 0)
109 #define UDBG_SYSCALL (1 << 1)
110 #define UDBG_BADABORT (1 << 2)
111 #define UDBG_SEGV (1 << 3)
112 #define UDBG_BUS (1 << 4)
114 extern unsigned int user_debug;
116 #if __LINUX_ARM_ARCH__ >= 4
117 #define vectors_high() (cr_alignment & CR_V)
119 #define vectors_high() (0)
122 #if __LINUX_ARM_ARCH__ >= 7
123 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
124 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
125 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
126 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
127 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
128 : : "r" (0) : "memory")
129 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
130 : : "r" (0) : "memory")
131 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
132 : : "r" (0) : "memory")
133 #elif defined(CONFIG_CPU_FA526)
134 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
135 : : "r" (0) : "memory")
136 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
137 : : "r" (0) : "memory")
138 #define dmb() __asm__ __volatile__ ("" : : : "memory")
140 #define isb() __asm__ __volatile__ ("" : : : "memory")
141 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
142 : : "r" (0) : "memory")
143 #define dmb() __asm__ __volatile__ ("" : : : "memory")
146 #ifdef CONFIG_ARCH_HAS_BARRIERS
147 #include <mach/barriers.h>
148 #elif defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP)
149 #define mb() do { dsb(); outer_sync(); } while (0)
153 #define mb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
154 #define rmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
155 #define wmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
159 #define smp_mb() barrier()
160 #define smp_rmb() barrier()
161 #define smp_wmb() barrier()
163 #define smp_mb() dmb()
164 #define smp_rmb() dmb()
165 #define smp_wmb() dmb()
168 #define read_barrier_depends() do { } while(0)
169 #define smp_read_barrier_depends() do { } while(0)
171 #define set_mb(var, value) do { var = value; smp_mb(); } while (0)
172 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
174 extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
175 extern unsigned long cr_alignment; /* defined in entry-armv.S */
177 static inline unsigned int get_cr(void)
180 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
184 static inline void set_cr(unsigned int val)
186 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
187 : : "r" (val) : "cc");
192 extern void adjust_cr(unsigned long mask, unsigned long set);
195 #define CPACC_FULL(n) (3 << (n * 2))
196 #define CPACC_SVC(n) (1 << (n * 2))
197 #define CPACC_DISABLE(n) (0 << (n * 2))
199 static inline unsigned int get_copro_access(void)
202 asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
203 : "=r" (val) : : "cc");
207 static inline void set_copro_access(unsigned int val)
209 asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
210 : : "r" (val) : "cc");
215 * switch_mm() may do a full cache flush over the context switch,
216 * so enable interrupts over the context switch to avoid high
219 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
222 * switch_to(prev, next) should switch from task `prev' to `next'
223 * `prev' will never be the same as `next'. schedule() itself
224 * contains the memory barrier to tell GCC not to cache `current'.
226 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
228 #define switch_to(prev,next,last) \
230 last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
233 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
235 * On the StrongARM, "swp" is terminally broken since it bypasses the
236 * cache totally. This means that the cache becomes inconsistent, and,
237 * since we use normal loads/stores as well, this is really bad.
238 * Typically, this causes oopsen in filp_close, but could have other,
239 * more disasterous effects. There are two work-arounds:
240 * 1. Disable interrupts and emulate the atomic swap
241 * 2. Clean the cache, perform atomic swap, flush the cache
243 * We choose (1) since its the "easiest" to achieve here and is not
244 * dependent on the processor type.
246 * NOTE that this solution won't work on an SMP system, so explcitly
252 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
254 extern void __bad_xchg(volatile void *, int);
259 #if __LINUX_ARM_ARCH__ >= 6
266 #if __LINUX_ARM_ARCH__ >= 6
268 asm volatile("@ __xchg1\n"
269 "1: ldrexb %0, [%3]\n"
270 " strexb %1, %2, [%3]\n"
273 : "=&r" (ret), "=&r" (tmp)
278 asm volatile("@ __xchg4\n"
279 "1: ldrex %0, [%3]\n"
280 " strex %1, %2, [%3]\n"
283 : "=&r" (ret), "=&r" (tmp)
287 #elif defined(swp_is_buggy)
289 #error SMP is not supported on this platform
292 raw_local_irq_save(flags);
293 ret = *(volatile unsigned char *)ptr;
294 *(volatile unsigned char *)ptr = x;
295 raw_local_irq_restore(flags);
299 raw_local_irq_save(flags);
300 ret = *(volatile unsigned long *)ptr;
301 *(volatile unsigned long *)ptr = x;
302 raw_local_irq_restore(flags);
306 asm volatile("@ __xchg1\n"
313 asm volatile("@ __xchg4\n"
321 __bad_xchg(ptr, size), ret = 0;
329 extern void disable_hlt(void);
330 extern void enable_hlt(void);
332 void cpu_idle_wait(void);
334 #include <asm-generic/cmpxchg-local.h>
336 #if __LINUX_ARM_ARCH__ < 6
339 #error "SMP is not supported on this platform"
343 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
346 #define cmpxchg_local(ptr, o, n) \
347 ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
348 (unsigned long)(n), sizeof(*(ptr))))
349 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
352 #include <asm-generic/cmpxchg.h>
355 #else /* __LINUX_ARM_ARCH__ >= 6 */
357 extern void __bad_cmpxchg(volatile void *ptr, int size);
360 * cmpxchg only support 32-bits operands on ARMv6.
363 static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
364 unsigned long new, int size)
366 unsigned long oldval, res;
369 #ifdef CONFIG_CPU_32v6K
372 asm volatile("@ __cmpxchg1\n"
376 " strexbeq %0, %4, [%2]\n"
377 : "=&r" (res), "=&r" (oldval)
378 : "r" (ptr), "Ir" (old), "r" (new)
384 asm volatile("@ __cmpxchg1\n"
388 " strexheq %0, %4, [%2]\n"
389 : "=&r" (res), "=&r" (oldval)
390 : "r" (ptr), "Ir" (old), "r" (new)
394 #endif /* CONFIG_CPU_32v6K */
397 asm volatile("@ __cmpxchg4\n"
401 " strexeq %0, %4, [%2]\n"
402 : "=&r" (res), "=&r" (oldval)
403 : "r" (ptr), "Ir" (old), "r" (new)
408 __bad_cmpxchg(ptr, size);
415 static inline unsigned long __cmpxchg_mb(volatile void *ptr, unsigned long old,
416 unsigned long new, int size)
421 ret = __cmpxchg(ptr, old, new, size);
427 #define cmpxchg(ptr,o,n) \
428 ((__typeof__(*(ptr)))__cmpxchg_mb((ptr), \
429 (unsigned long)(o), \
430 (unsigned long)(n), \
433 static inline unsigned long __cmpxchg_local(volatile void *ptr,
435 unsigned long new, int size)
440 #ifndef CONFIG_CPU_32v6K
443 ret = __cmpxchg_local_generic(ptr, old, new, size);
445 #endif /* !CONFIG_CPU_32v6K */
447 ret = __cmpxchg(ptr, old, new, size);
453 #define cmpxchg_local(ptr,o,n) \
454 ((__typeof__(*(ptr)))__cmpxchg_local((ptr), \
455 (unsigned long)(o), \
456 (unsigned long)(n), \
459 #ifdef CONFIG_CPU_32v6K
462 * Note : ARMv7-M (currently unsupported by Linux) does not support
463 * ldrexd/strexd. If ARMv7-M is ever supported by the Linux kernel, it should
464 * not be allowed to use __cmpxchg64.
466 static inline unsigned long long __cmpxchg64(volatile void *ptr,
467 unsigned long long old,
468 unsigned long long new)
470 register unsigned long long oldval asm("r0");
471 register unsigned long long __old asm("r2") = old;
472 register unsigned long long __new asm("r4") = new;
478 " ldrexd %1, %H1, [%2]\n"
482 " strexdeq %0, %4, %H4, [%2]\n"
483 : "=&r" (res), "=&r" (oldval)
484 : "r" (ptr), "Ir" (__old), "r" (__new)
491 static inline unsigned long long __cmpxchg64_mb(volatile void *ptr,
492 unsigned long long old,
493 unsigned long long new)
495 unsigned long long ret;
498 ret = __cmpxchg64(ptr, old, new);
504 #define cmpxchg64(ptr,o,n) \
505 ((__typeof__(*(ptr)))__cmpxchg64_mb((ptr), \
506 (unsigned long long)(o), \
507 (unsigned long long)(n)))
509 #define cmpxchg64_local(ptr,o,n) \
510 ((__typeof__(*(ptr)))__cmpxchg64((ptr), \
511 (unsigned long long)(o), \
512 (unsigned long long)(n)))
514 #else /* !CONFIG_CPU_32v6K */
516 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
518 #endif /* CONFIG_CPU_32v6K */
520 #endif /* __LINUX_ARM_ARCH__ >= 6 */
522 #endif /* __ASSEMBLY__ */
524 #define arch_align_stack(x) (x)
526 #endif /* __KERNEL__ */