1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
7 #define CPU_ARCH_UNKNOWN 0
8 #define CPU_ARCH_ARMv3 1
9 #define CPU_ARCH_ARMv4 2
10 #define CPU_ARCH_ARMv4T 3
11 #define CPU_ARCH_ARMv5 4
12 #define CPU_ARCH_ARMv5T 5
13 #define CPU_ARCH_ARMv5TE 6
14 #define CPU_ARCH_ARMv5TEJ 7
15 #define CPU_ARCH_ARMv6 8
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 */
45 #define CPUID_CACHETYPE 1
47 #define CPUID_TLBTYPE 3
49 #define read_cpuid(reg) \
52 asm("mrc p15, 0, %0, c0, c0, " __stringify(reg) \
60 * This is used to ensure the compiler did actually allocate the register we
61 * asked it for some inline assembly sequences. Apparently we can't trust
62 * the compiler from one version to another so a bit of paranoia won't hurt.
63 * This string is meant to be concatenated with the inline asm string and
64 * will cause compilation to stop on mismatch.
65 * (for details, see gcc PR 15089)
67 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
71 #include <linux/linkage.h>
76 /* information about the system we're running on */
77 extern unsigned int system_rev;
78 extern unsigned int system_serial_low;
79 extern unsigned int system_serial_high;
80 extern unsigned int mem_fclk_21285;
84 void die(const char *msg, struct pt_regs *regs, int err)
85 __attribute__((noreturn));
88 void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
89 unsigned long err, unsigned long trap);
91 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
93 int sig, const char *name);
96 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
98 #define tas(ptr) (xchg((ptr),1))
100 extern asmlinkage void __backtrace(void);
101 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
104 extern void show_pte(struct mm_struct *mm, unsigned long addr);
105 extern void __show_regs(struct pt_regs *);
107 extern int cpu_architecture(void);
108 extern void cpu_init(void);
110 void arm_machine_restart(char mode);
111 extern void (*arm_pm_restart)(char str);
114 * Intel's XScale3 core supports some v6 features (supersections, L2)
115 * but advertises itself as v5 as it does not support the v6 ISA. For
116 * this reason, we need a way to explicitly test for this type of CPU.
118 #ifndef CONFIG_CPU_XSC3
119 #define cpu_is_xsc3() 0
121 static inline int cpu_is_xsc3(void)
123 extern unsigned int processor_id;
125 if ((processor_id & 0xffffe000) == 0x69056000)
132 #if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
133 #define cpu_is_xscale() 0
135 #define cpu_is_xscale() 1
139 __asm__ __volatile__( \
140 "mcr p15, 0, %0, c1, c0, 0 @ set CR" \
145 unsigned int __val; \
146 __asm__ __volatile__( \
147 "mrc p15, 0, %0, c1, c0, 0 @ get CR" \
148 : "=r" (__val) : : "cc"); \
152 extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
153 extern unsigned long cr_alignment; /* defined in entry-armv.S */
155 #define UDBG_UNDEFINED (1 << 0)
156 #define UDBG_SYSCALL (1 << 1)
157 #define UDBG_BADABORT (1 << 2)
158 #define UDBG_SEGV (1 << 3)
159 #define UDBG_BUS (1 << 4)
161 extern unsigned int user_debug;
163 #if __LINUX_ARM_ARCH__ >= 4
164 #define vectors_high() (cr_alignment & CR_V)
166 #define vectors_high() (0)
169 #if __LINUX_ARM_ARCH__ >= 6
170 #define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
171 : : "r" (0) : "memory")
173 #define mb() __asm__ __volatile__ ("" : : : "memory")
177 #define read_barrier_depends() do { } while(0)
178 #define set_mb(var, value) do { var = value; mb(); } while (0)
179 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
182 * switch_mm() may do a full cache flush over the context switch,
183 * so enable interrupts over the context switch to avoid high
186 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
189 * switch_to(prev, next) should switch from task `prev' to `next'
190 * `prev' will never be the same as `next'. schedule() itself
191 * contains the memory barrier to tell GCC not to cache `current'.
193 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
195 #define switch_to(prev,next,last) \
197 last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
201 * On SMP systems, when the scheduler does migration-cost autodetection,
202 * it needs a way to flush as much of the CPU's caches as possible.
204 * TODO: fill this in!
206 static inline void sched_cacheflush(void)
210 #include <linux/irqflags.h>
214 #define smp_mb() mb()
215 #define smp_rmb() rmb()
216 #define smp_wmb() wmb()
217 #define smp_read_barrier_depends() read_barrier_depends()
221 #define smp_mb() barrier()
222 #define smp_rmb() barrier()
223 #define smp_wmb() barrier()
224 #define smp_read_barrier_depends() do { } while(0)
226 #endif /* CONFIG_SMP */
228 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
230 * On the StrongARM, "swp" is terminally broken since it bypasses the
231 * cache totally. This means that the cache becomes inconsistent, and,
232 * since we use normal loads/stores as well, this is really bad.
233 * Typically, this causes oopsen in filp_close, but could have other,
234 * more disasterous effects. There are two work-arounds:
235 * 1. Disable interrupts and emulate the atomic swap
236 * 2. Clean the cache, perform atomic swap, flush the cache
238 * We choose (1) since its the "easiest" to achieve here and is not
239 * dependent on the processor type.
241 * NOTE that this solution won't work on an SMP system, so explcitly
247 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
249 extern void __bad_xchg(volatile void *, int);
254 #if __LINUX_ARM_ARCH__ >= 6
259 #if __LINUX_ARM_ARCH__ >= 6
261 asm volatile("@ __xchg1\n"
262 "1: ldrexb %0, [%3]\n"
263 " strexb %1, %2, [%3]\n"
266 : "=&r" (ret), "=&r" (tmp)
271 asm volatile("@ __xchg4\n"
272 "1: ldrex %0, [%3]\n"
273 " strex %1, %2, [%3]\n"
276 : "=&r" (ret), "=&r" (tmp)
280 #elif defined(swp_is_buggy)
282 #error SMP is not supported on this platform
285 local_irq_save(flags);
286 ret = *(volatile unsigned char *)ptr;
287 *(volatile unsigned char *)ptr = x;
288 local_irq_restore(flags);
292 local_irq_save(flags);
293 ret = *(volatile unsigned long *)ptr;
294 *(volatile unsigned long *)ptr = x;
295 local_irq_restore(flags);
299 asm volatile("@ __xchg1\n"
306 asm volatile("@ __xchg4\n"
314 __bad_xchg(ptr, size), ret = 0;
321 extern void disable_hlt(void);
322 extern void enable_hlt(void);
324 #endif /* __ASSEMBLY__ */
326 #define arch_align_stack(x) (x)
328 #endif /* __KERNEL__ */