1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
6 #include <asm/memory.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
17 #define CPU_ARCH_ARMv7 9
20 * CR1 bits (CP#15 CR1)
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 */
47 #define CPUID_CACHETYPE 1
49 #define CPUID_TLBTYPE 3
52 * This is used to ensure the compiler did actually allocate the register we
53 * asked it for some inline assembly sequences. Apparently we can't trust
54 * the compiler from one version to another so a bit of paranoia won't hurt.
55 * This string is meant to be concatenated with the inline asm string and
56 * will cause compilation to stop on mismatch.
57 * (for details, see gcc PR 15089)
59 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
63 #include <linux/linkage.h>
64 #include <linux/stringify.h>
65 #include <linux/irqflags.h>
67 #ifdef CONFIG_CPU_CP15
68 #define read_cpuid(reg) \
71 asm("mrc p15, 0, %0, c0, c0, " __stringify(reg) \
78 extern unsigned int processor_id;
79 #define read_cpuid(reg) (processor_id)
83 * The CPU ID never changes at run time, so we might as well tell the
84 * compiler that it's constant. Use this function to read the CPU ID
85 * rather than directly reading processor_id or read_cpuid() directly.
87 static inline unsigned int read_cpuid_id(void) __attribute_const__;
89 static inline unsigned int read_cpuid_id(void)
91 return read_cpuid(CPUID_ID);
94 #define __exception __attribute__((section(".exception.text")))
99 /* information about the system we're running on */
100 extern unsigned int system_rev;
101 extern unsigned int system_serial_low;
102 extern unsigned int system_serial_high;
103 extern unsigned int mem_fclk_21285;
107 void die(const char *msg, struct pt_regs *regs, int err)
108 __attribute__((noreturn));
111 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
112 unsigned long err, unsigned long trap);
114 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
116 int sig, const char *name);
118 #define xchg(ptr,x) \
119 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
121 extern asmlinkage void __backtrace(void);
122 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
125 extern void show_pte(struct mm_struct *mm, unsigned long addr);
126 extern void __show_regs(struct pt_regs *);
128 extern int cpu_architecture(void);
129 extern void cpu_init(void);
131 void arm_machine_restart(char mode);
132 extern void (*arm_pm_restart)(char str);
135 * Intel's XScale3 core supports some v6 features (supersections, L2)
136 * but advertises itself as v5 as it does not support the v6 ISA. For
137 * this reason, we need a way to explicitly test for this type of CPU.
139 #ifndef CONFIG_CPU_XSC3
140 #define cpu_is_xsc3() 0
142 static inline int cpu_is_xsc3(void)
144 extern unsigned int processor_id;
146 if ((processor_id & 0xffffe000) == 0x69056000)
153 #if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
154 #define cpu_is_xscale() 0
156 #define cpu_is_xscale() 1
159 #define UDBG_UNDEFINED (1 << 0)
160 #define UDBG_SYSCALL (1 << 1)
161 #define UDBG_BADABORT (1 << 2)
162 #define UDBG_SEGV (1 << 3)
163 #define UDBG_BUS (1 << 4)
165 extern unsigned int user_debug;
167 #if __LINUX_ARM_ARCH__ >= 4
168 #define vectors_high() (cr_alignment & CR_V)
170 #define vectors_high() (0)
173 #if __LINUX_ARM_ARCH__ >= 7
174 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
175 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
176 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
177 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
178 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
179 : : "r" (0) : "memory")
180 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
181 : : "r" (0) : "memory")
182 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
183 : : "r" (0) : "memory")
185 #define isb() __asm__ __volatile__ ("" : : : "memory")
186 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
187 : : "r" (0) : "memory")
188 #define dmb() __asm__ __volatile__ ("" : : : "memory")
192 #define mb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
193 #define rmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
194 #define wmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
195 #define smp_mb() barrier()
196 #define smp_rmb() barrier()
197 #define smp_wmb() barrier()
202 #define smp_mb() dmb()
203 #define smp_rmb() dmb()
204 #define smp_wmb() dmb()
206 #define read_barrier_depends() do { } while(0)
207 #define smp_read_barrier_depends() do { } while(0)
209 #define set_mb(var, value) do { var = value; smp_mb(); } while (0)
210 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
212 extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
213 extern unsigned long cr_alignment; /* defined in entry-armv.S */
215 static inline unsigned int get_cr(void)
218 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
222 static inline void set_cr(unsigned int val)
224 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
225 : : "r" (val) : "cc");
230 extern void adjust_cr(unsigned long mask, unsigned long set);
233 #define CPACC_FULL(n) (3 << (n * 2))
234 #define CPACC_SVC(n) (1 << (n * 2))
235 #define CPACC_DISABLE(n) (0 << (n * 2))
237 static inline unsigned int get_copro_access(void)
240 asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
241 : "=r" (val) : : "cc");
245 static inline void set_copro_access(unsigned int val)
247 asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
248 : : "r" (val) : "cc");
253 * switch_mm() may do a full cache flush over the context switch,
254 * so enable interrupts over the context switch to avoid high
257 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
260 * switch_to(prev, next) should switch from task `prev' to `next'
261 * `prev' will never be the same as `next'. schedule() itself
262 * contains the memory barrier to tell GCC not to cache `current'.
264 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
266 #define switch_to(prev,next,last) \
268 last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
271 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
273 * On the StrongARM, "swp" is terminally broken since it bypasses the
274 * cache totally. This means that the cache becomes inconsistent, and,
275 * since we use normal loads/stores as well, this is really bad.
276 * Typically, this causes oopsen in filp_close, but could have other,
277 * more disasterous effects. There are two work-arounds:
278 * 1. Disable interrupts and emulate the atomic swap
279 * 2. Clean the cache, perform atomic swap, flush the cache
281 * We choose (1) since its the "easiest" to achieve here and is not
282 * dependent on the processor type.
284 * NOTE that this solution won't work on an SMP system, so explcitly
290 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
292 extern void __bad_xchg(volatile void *, int);
297 #if __LINUX_ARM_ARCH__ >= 6
302 #if __LINUX_ARM_ARCH__ >= 6
304 asm volatile("@ __xchg1\n"
305 "1: ldrexb %0, [%3]\n"
306 " strexb %1, %2, [%3]\n"
309 : "=&r" (ret), "=&r" (tmp)
314 asm volatile("@ __xchg4\n"
315 "1: ldrex %0, [%3]\n"
316 " strex %1, %2, [%3]\n"
319 : "=&r" (ret), "=&r" (tmp)
323 #elif defined(swp_is_buggy)
325 #error SMP is not supported on this platform
328 raw_local_irq_save(flags);
329 ret = *(volatile unsigned char *)ptr;
330 *(volatile unsigned char *)ptr = x;
331 raw_local_irq_restore(flags);
335 raw_local_irq_save(flags);
336 ret = *(volatile unsigned long *)ptr;
337 *(volatile unsigned long *)ptr = x;
338 raw_local_irq_restore(flags);
342 asm volatile("@ __xchg1\n"
349 asm volatile("@ __xchg4\n"
357 __bad_xchg(ptr, size), ret = 0;
364 extern void disable_hlt(void);
365 extern void enable_hlt(void);
367 #include <asm-generic/cmpxchg-local.h>
370 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
373 #define cmpxchg_local(ptr, o, n) \
374 ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
375 (unsigned long)(n), sizeof(*(ptr))))
376 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
379 #include <asm-generic/cmpxchg.h>
382 #endif /* __ASSEMBLY__ */
384 #define arch_align_stack(x) (x)
386 #endif /* __KERNEL__ */