1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
6 #include <linux/config.h>
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
19 * CR1 bits (CP#15 CR1)
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 */
46 #define CPUID_CACHETYPE 1
48 #define CPUID_TLBTYPE 3
50 #define read_cpuid(reg) \
53 asm("mrc p15, 0, %0, c0, c0, " __stringify(reg) \
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)
68 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
72 #include <linux/linkage.h>
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;
85 void die(const char *msg, struct pt_regs *regs, int err)
86 __attribute__((noreturn));
89 void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
90 unsigned long err, unsigned long trap);
92 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
94 int sig, const char *name);
97 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
99 #define tas(ptr) (xchg((ptr),1))
101 extern asmlinkage void __backtrace(void);
102 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
105 extern void show_pte(struct mm_struct *mm, unsigned long addr);
106 extern void __show_regs(struct pt_regs *);
108 extern int cpu_architecture(void);
109 extern void cpu_init(void);
112 __asm__ __volatile__( \
113 "mcr p15, 0, %0, c1, c0, 0 @ set CR" \
118 unsigned int __val; \
119 __asm__ __volatile__( \
120 "mrc p15, 0, %0, c1, c0, 0 @ get CR" \
121 : "=r" (__val) : : "cc"); \
125 extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
126 extern unsigned long cr_alignment; /* defined in entry-armv.S */
128 #define UDBG_UNDEFINED (1 << 0)
129 #define UDBG_SYSCALL (1 << 1)
130 #define UDBG_BADABORT (1 << 2)
131 #define UDBG_SEGV (1 << 3)
132 #define UDBG_BUS (1 << 4)
134 extern unsigned int user_debug;
136 #if __LINUX_ARM_ARCH__ >= 4
137 #define vectors_high() (cr_alignment & CR_V)
139 #define vectors_high() (0)
142 #if __LINUX_ARM_ARCH__ >= 6
143 #define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
144 : : "r" (0) : "memory")
146 #define mb() __asm__ __volatile__ ("" : : : "memory")
150 #define read_barrier_depends() do { } while(0)
151 #define set_mb(var, value) do { var = value; mb(); } while (0)
152 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
153 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
156 * switch_mm() may do a full cache flush over the context switch,
157 * so enable interrupts over the context switch to avoid high
160 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
163 * switch_to(prev, next) should switch from task `prev' to `next'
164 * `prev' will never be the same as `next'. schedule() itself
165 * contains the memory barrier to tell GCC not to cache `current'.
167 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
169 #define switch_to(prev,next,last) \
171 last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
175 * On SMP systems, when the scheduler does migration-cost autodetection,
176 * it needs a way to flush as much of the CPU's caches as possible.
178 * TODO: fill this in!
180 static inline void sched_cacheflush(void)
185 * CPU interrupt mask handling.
187 #if __LINUX_ARM_ARCH__ >= 6
189 #define local_irq_save(x) \
191 __asm__ __volatile__( \
192 "mrs %0, cpsr @ local_irq_save\n" \
194 : "=r" (x) : : "memory", "cc"); \
197 #define local_irq_enable() __asm__("cpsie i @ __sti" : : : "memory", "cc")
198 #define local_irq_disable() __asm__("cpsid i @ __cli" : : : "memory", "cc")
199 #define local_fiq_enable() __asm__("cpsie f @ __stf" : : : "memory", "cc")
200 #define local_fiq_disable() __asm__("cpsid f @ __clf" : : : "memory", "cc")
205 * Save the current interrupt enable state & disable IRQs
207 #define local_irq_save(x) \
209 unsigned long temp; \
210 (void) (&temp == &x); \
211 __asm__ __volatile__( \
212 "mrs %0, cpsr @ local_irq_save\n" \
213 " orr %1, %0, #128\n" \
215 : "=r" (x), "=r" (temp) \
223 #define local_irq_enable() \
225 unsigned long temp; \
226 __asm__ __volatile__( \
227 "mrs %0, cpsr @ local_irq_enable\n" \
228 " bic %0, %0, #128\n" \
238 #define local_irq_disable() \
240 unsigned long temp; \
241 __asm__ __volatile__( \
242 "mrs %0, cpsr @ local_irq_disable\n" \
243 " orr %0, %0, #128\n" \
253 #define local_fiq_enable() \
255 unsigned long temp; \
256 __asm__ __volatile__( \
257 "mrs %0, cpsr @ stf\n" \
258 " bic %0, %0, #64\n" \
268 #define local_fiq_disable() \
270 unsigned long temp; \
271 __asm__ __volatile__( \
272 "mrs %0, cpsr @ clf\n" \
273 " orr %0, %0, #64\n" \
283 * Save the current interrupt enable state.
285 #define local_save_flags(x) \
287 __asm__ __volatile__( \
288 "mrs %0, cpsr @ local_save_flags" \
289 : "=r" (x) : : "memory", "cc"); \
293 * restore saved IRQ & FIQ state
295 #define local_irq_restore(x) \
296 __asm__ __volatile__( \
297 "msr cpsr_c, %0 @ local_irq_restore\n" \
302 #define irqs_disabled() \
304 unsigned long flags; \
305 local_save_flags(flags); \
306 (int)(flags & PSR_I_BIT); \
311 #define smp_mb() mb()
312 #define smp_rmb() rmb()
313 #define smp_wmb() wmb()
314 #define smp_read_barrier_depends() read_barrier_depends()
318 #define smp_mb() barrier()
319 #define smp_rmb() barrier()
320 #define smp_wmb() barrier()
321 #define smp_read_barrier_depends() do { } while(0)
323 #endif /* CONFIG_SMP */
325 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
327 * On the StrongARM, "swp" is terminally broken since it bypasses the
328 * cache totally. This means that the cache becomes inconsistent, and,
329 * since we use normal loads/stores as well, this is really bad.
330 * Typically, this causes oopsen in filp_close, but could have other,
331 * more disasterous effects. There are two work-arounds:
332 * 1. Disable interrupts and emulate the atomic swap
333 * 2. Clean the cache, perform atomic swap, flush the cache
335 * We choose (1) since its the "easiest" to achieve here and is not
336 * dependent on the processor type.
338 * NOTE that this solution won't work on an SMP system, so explcitly
344 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
346 extern void __bad_xchg(volatile void *, int);
351 #if __LINUX_ARM_ARCH__ >= 6
356 #if __LINUX_ARM_ARCH__ >= 6
358 asm volatile("@ __xchg1\n"
359 "1: ldrexb %0, [%3]\n"
360 " strexb %1, %2, [%3]\n"
363 : "=&r" (ret), "=&r" (tmp)
368 asm volatile("@ __xchg4\n"
369 "1: ldrex %0, [%3]\n"
370 " strex %1, %2, [%3]\n"
373 : "=&r" (ret), "=&r" (tmp)
377 #elif defined(swp_is_buggy)
379 #error SMP is not supported on this platform
382 local_irq_save(flags);
383 ret = *(volatile unsigned char *)ptr;
384 *(volatile unsigned char *)ptr = x;
385 local_irq_restore(flags);
389 local_irq_save(flags);
390 ret = *(volatile unsigned long *)ptr;
391 *(volatile unsigned long *)ptr = x;
392 local_irq_restore(flags);
396 asm volatile("@ __xchg1\n"
403 asm volatile("@ __xchg4\n"
411 __bad_xchg(ptr, size), ret = 0;
418 #endif /* __ASSEMBLY__ */
420 #define arch_align_stack(x) (x)
422 #endif /* __KERNEL__ */