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 */
45 #define CR_EE (1 << 25) /* Exception (Big) Endian */
46 #define CR_TRE (1 << 28) /* TEX remap enable */
47 #define CR_AFE (1 << 29) /* Access flag enable */
48 #define CR_TE (1 << 30) /* Thumb exception enable */
51 * This is used to ensure the compiler did actually allocate the register we
52 * asked it for some inline assembly sequences. Apparently we can't trust
53 * the compiler from one version to another so a bit of paranoia won't hurt.
54 * This string is meant to be concatenated with the inline asm string and
55 * will cause compilation to stop on mismatch.
56 * (for details, see gcc PR 15089)
58 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
62 #include <linux/linkage.h>
63 #include <linux/irqflags.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)
79 __attribute__((noreturn));
82 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
83 unsigned long err, unsigned long trap);
85 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
87 int sig, const char *name);
90 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
92 extern asmlinkage void __backtrace(void);
93 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
96 extern void show_pte(struct mm_struct *mm, unsigned long addr);
97 extern void __show_regs(struct pt_regs *);
99 extern int cpu_architecture(void);
100 extern void cpu_init(void);
102 void arm_machine_restart(char mode);
103 extern void (*arm_pm_restart)(char str);
105 #define UDBG_UNDEFINED (1 << 0)
106 #define UDBG_SYSCALL (1 << 1)
107 #define UDBG_BADABORT (1 << 2)
108 #define UDBG_SEGV (1 << 3)
109 #define UDBG_BUS (1 << 4)
111 extern unsigned int user_debug;
113 #if __LINUX_ARM_ARCH__ >= 4
114 #define vectors_high() (cr_alignment & CR_V)
116 #define vectors_high() (0)
119 #if __LINUX_ARM_ARCH__ >= 7
120 #define isb() __asm__ __volatile__ ("isb" : : : "memory")
121 #define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
122 #define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
123 #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
124 #define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
125 : : "r" (0) : "memory")
126 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
127 : : "r" (0) : "memory")
128 #define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
129 : : "r" (0) : "memory")
131 #define isb() __asm__ __volatile__ ("" : : : "memory")
132 #define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
133 : : "r" (0) : "memory")
134 #define dmb() __asm__ __volatile__ ("" : : : "memory")
138 #define mb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
139 #define rmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
140 #define wmb() do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
141 #define smp_mb() barrier()
142 #define smp_rmb() barrier()
143 #define smp_wmb() barrier()
148 #define smp_mb() dmb()
149 #define smp_rmb() dmb()
150 #define smp_wmb() dmb()
152 #define read_barrier_depends() do { } while(0)
153 #define smp_read_barrier_depends() do { } while(0)
155 #define set_mb(var, value) do { var = value; smp_mb(); } while (0)
156 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
158 extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
159 extern unsigned long cr_alignment; /* defined in entry-armv.S */
161 static inline unsigned int get_cr(void)
164 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
168 static inline void set_cr(unsigned int val)
170 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
171 : : "r" (val) : "cc");
176 extern void adjust_cr(unsigned long mask, unsigned long set);
179 #define CPACC_FULL(n) (3 << (n * 2))
180 #define CPACC_SVC(n) (1 << (n * 2))
181 #define CPACC_DISABLE(n) (0 << (n * 2))
183 static inline unsigned int get_copro_access(void)
186 asm("mrc p15, 0, %0, c1, c0, 2 @ get copro access"
187 : "=r" (val) : : "cc");
191 static inline void set_copro_access(unsigned int val)
193 asm volatile("mcr p15, 0, %0, c1, c0, 2 @ set copro access"
194 : : "r" (val) : "cc");
199 * switch_mm() may do a full cache flush over the context switch,
200 * so enable interrupts over the context switch to avoid high
203 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
206 * switch_to(prev, next) should switch from task `prev' to `next'
207 * `prev' will never be the same as `next'. schedule() itself
208 * contains the memory barrier to tell GCC not to cache `current'.
210 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
212 #define switch_to(prev,next,last) \
214 last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
217 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
219 * On the StrongARM, "swp" is terminally broken since it bypasses the
220 * cache totally. This means that the cache becomes inconsistent, and,
221 * since we use normal loads/stores as well, this is really bad.
222 * Typically, this causes oopsen in filp_close, but could have other,
223 * more disasterous effects. There are two work-arounds:
224 * 1. Disable interrupts and emulate the atomic swap
225 * 2. Clean the cache, perform atomic swap, flush the cache
227 * We choose (1) since its the "easiest" to achieve here and is not
228 * dependent on the processor type.
230 * NOTE that this solution won't work on an SMP system, so explcitly
236 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
238 extern void __bad_xchg(volatile void *, int);
243 #if __LINUX_ARM_ARCH__ >= 6
248 #if __LINUX_ARM_ARCH__ >= 6
250 asm volatile("@ __xchg1\n"
251 "1: ldrexb %0, [%3]\n"
252 " strexb %1, %2, [%3]\n"
255 : "=&r" (ret), "=&r" (tmp)
260 asm volatile("@ __xchg4\n"
261 "1: ldrex %0, [%3]\n"
262 " strex %1, %2, [%3]\n"
265 : "=&r" (ret), "=&r" (tmp)
269 #elif defined(swp_is_buggy)
271 #error SMP is not supported on this platform
274 raw_local_irq_save(flags);
275 ret = *(volatile unsigned char *)ptr;
276 *(volatile unsigned char *)ptr = x;
277 raw_local_irq_restore(flags);
281 raw_local_irq_save(flags);
282 ret = *(volatile unsigned long *)ptr;
283 *(volatile unsigned long *)ptr = x;
284 raw_local_irq_restore(flags);
288 asm volatile("@ __xchg1\n"
295 asm volatile("@ __xchg4\n"
303 __bad_xchg(ptr, size), ret = 0;
310 extern void disable_hlt(void);
311 extern void enable_hlt(void);
313 #include <asm-generic/cmpxchg-local.h>
316 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
319 #define cmpxchg_local(ptr, o, n) \
320 ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
321 (unsigned long)(n), sizeof(*(ptr))))
322 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
325 #include <asm-generic/cmpxchg.h>
328 #endif /* __ASSEMBLY__ */
330 #define arch_align_stack(x) (x)
332 #endif /* __KERNEL__ */