[ARM] 2858/1: ARM has sys_fadvise64_64 only
[linux-2.6] / include / asm-arm / system.h
1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
3
4 #ifdef __KERNEL__
5
6 #include <linux/config.h>
7
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
18 /*
19  * CR1 bits (CP#15 CR1)
20  */
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                  */
44
45 #define CPUID_ID        0
46 #define CPUID_CACHETYPE 1
47 #define CPUID_TCM       2
48 #define CPUID_TLBTYPE   3
49
50 #define read_cpuid(reg)                                                 \
51         ({                                                              \
52                 unsigned int __val;                                     \
53                 asm("mrc        p15, 0, %0, c0, c0, " __stringify(reg)  \
54                     : "=r" (__val)                                      \
55                     :                                                   \
56                     : "cc");                                            \
57                 __val;                                                  \
58         })
59
60 /*
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)
67  */
68 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
69
70 #ifndef __ASSEMBLY__
71
72 #include <linux/linkage.h>
73
74 struct thread_info;
75 struct task_struct;
76
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;
82
83 struct pt_regs;
84
85 void die(const char *msg, struct pt_regs *regs, int err)
86                 __attribute__((noreturn));
87
88 struct siginfo;
89 void notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
90                 unsigned long err, unsigned long trap);
91
92 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
93                                        struct pt_regs *),
94                      int sig, const char *name);
95
96 #include <asm/proc-fns.h>
97
98 #define xchg(ptr,x) \
99         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
100
101 #define tas(ptr) (xchg((ptr),1))
102
103 extern asmlinkage void __backtrace(void);
104 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 *);
107
108 extern int cpu_architecture(void);
109 extern void cpu_init(void);
110
111 #define set_cr(x)                                       \
112         __asm__ __volatile__(                           \
113         "mcr    p15, 0, %0, c1, c0, 0   @ set CR"       \
114         : : "r" (x) : "cc")
115
116 #define get_cr()                                        \
117         ({                                              \
118         unsigned int __val;                             \
119         __asm__ __volatile__(                           \
120         "mrc    p15, 0, %0, c1, c0, 0   @ get CR"       \
121         : "=r" (__val) : : "cc");                       \
122         __val;                                          \
123         })
124
125 extern unsigned long cr_no_alignment;   /* defined in entry-armv.S */
126 extern unsigned long cr_alignment;      /* defined in entry-armv.S */
127
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)
133
134 extern unsigned int user_debug;
135
136 #if __LINUX_ARM_ARCH__ >= 4
137 #define vectors_high()  (cr_alignment & CR_V)
138 #else
139 #define vectors_high()  (0)
140 #endif
141
142 #if __LINUX_ARM_ARCH__ >= 6
143 #define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
144                                    : : "r" (0) : "memory")
145 #else
146 #define mb() __asm__ __volatile__ ("" : : : "memory")
147 #endif
148 #define rmb() mb()
149 #define wmb() mb()
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");
154
155 /*
156  * switch_mm() may do a full cache flush over the context switch,
157  * so enable interrupts over the context switch to avoid high
158  * latency.
159  */
160 #define __ARCH_WANT_INTERRUPTS_ON_CTXSW
161
162 /*
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'.
166  */
167 extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
168
169 #define switch_to(prev,next,last)                                       \
170 do {                                                                    \
171         last = __switch_to(prev,prev->thread_info,next->thread_info);   \
172 } while (0)
173
174 /*
175  * CPU interrupt mask handling.
176  */
177 #if __LINUX_ARM_ARCH__ >= 6
178
179 #define local_irq_save(x)                                       \
180         ({                                                      \
181         __asm__ __volatile__(                                   \
182         "mrs    %0, cpsr                @ local_irq_save\n"     \
183         "cpsid  i"                                              \
184         : "=r" (x) : : "memory", "cc");                         \
185         })
186
187 #define local_irq_enable()  __asm__("cpsie i    @ __sti" : : : "memory", "cc")
188 #define local_irq_disable() __asm__("cpsid i    @ __cli" : : : "memory", "cc")
189 #define local_fiq_enable()  __asm__("cpsie f    @ __stf" : : : "memory", "cc")
190 #define local_fiq_disable() __asm__("cpsid f    @ __clf" : : : "memory", "cc")
191
192 #else
193
194 /*
195  * Save the current interrupt enable state & disable IRQs
196  */
197 #define local_irq_save(x)                                       \
198         ({                                                      \
199                 unsigned long temp;                             \
200                 (void) (&temp == &x);                           \
201         __asm__ __volatile__(                                   \
202         "mrs    %0, cpsr                @ local_irq_save\n"     \
203 "       orr     %1, %0, #128\n"                                 \
204 "       msr     cpsr_c, %1"                                     \
205         : "=r" (x), "=r" (temp)                                 \
206         :                                                       \
207         : "memory", "cc");                                      \
208         })
209         
210 /*
211  * Enable IRQs
212  */
213 #define local_irq_enable()                                      \
214         ({                                                      \
215                 unsigned long temp;                             \
216         __asm__ __volatile__(                                   \
217         "mrs    %0, cpsr                @ local_irq_enable\n"   \
218 "       bic     %0, %0, #128\n"                                 \
219 "       msr     cpsr_c, %0"                                     \
220         : "=r" (temp)                                           \
221         :                                                       \
222         : "memory", "cc");                                      \
223         })
224
225 /*
226  * Disable IRQs
227  */
228 #define local_irq_disable()                                     \
229         ({                                                      \
230                 unsigned long temp;                             \
231         __asm__ __volatile__(                                   \
232         "mrs    %0, cpsr                @ local_irq_disable\n"  \
233 "       orr     %0, %0, #128\n"                                 \
234 "       msr     cpsr_c, %0"                                     \
235         : "=r" (temp)                                           \
236         :                                                       \
237         : "memory", "cc");                                      \
238         })
239
240 /*
241  * Enable FIQs
242  */
243 #define local_fiq_enable()                                      \
244         ({                                                      \
245                 unsigned long temp;                             \
246         __asm__ __volatile__(                                   \
247         "mrs    %0, cpsr                @ stf\n"                \
248 "       bic     %0, %0, #64\n"                                  \
249 "       msr     cpsr_c, %0"                                     \
250         : "=r" (temp)                                           \
251         :                                                       \
252         : "memory", "cc");                                      \
253         })
254
255 /*
256  * Disable FIQs
257  */
258 #define local_fiq_disable()                                     \
259         ({                                                      \
260                 unsigned long temp;                             \
261         __asm__ __volatile__(                                   \
262         "mrs    %0, cpsr                @ clf\n"                \
263 "       orr     %0, %0, #64\n"                                  \
264 "       msr     cpsr_c, %0"                                     \
265         : "=r" (temp)                                           \
266         :                                                       \
267         : "memory", "cc");                                      \
268         })
269
270 #endif
271
272 /*
273  * Save the current interrupt enable state.
274  */
275 #define local_save_flags(x)                                     \
276         ({                                                      \
277         __asm__ __volatile__(                                   \
278         "mrs    %0, cpsr                @ local_save_flags"     \
279         : "=r" (x) : : "memory", "cc");                         \
280         })
281
282 /*
283  * restore saved IRQ & FIQ state
284  */
285 #define local_irq_restore(x)                                    \
286         __asm__ __volatile__(                                   \
287         "msr    cpsr_c, %0              @ local_irq_restore\n"  \
288         :                                                       \
289         : "r" (x)                                               \
290         : "memory", "cc")
291
292 #define irqs_disabled()                 \
293 ({                                      \
294         unsigned long flags;            \
295         local_save_flags(flags);        \
296         (int)(flags & PSR_I_BIT);       \
297 })
298
299 #ifdef CONFIG_SMP
300
301 #define smp_mb()                mb()
302 #define smp_rmb()               rmb()
303 #define smp_wmb()               wmb()
304 #define smp_read_barrier_depends()              read_barrier_depends()
305
306 #else
307
308 #define smp_mb()                barrier()
309 #define smp_rmb()               barrier()
310 #define smp_wmb()               barrier()
311 #define smp_read_barrier_depends()              do { } while(0)
312
313 #endif /* CONFIG_SMP */
314
315 #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
316 /*
317  * On the StrongARM, "swp" is terminally broken since it bypasses the
318  * cache totally.  This means that the cache becomes inconsistent, and,
319  * since we use normal loads/stores as well, this is really bad.
320  * Typically, this causes oopsen in filp_close, but could have other,
321  * more disasterous effects.  There are two work-arounds:
322  *  1. Disable interrupts and emulate the atomic swap
323  *  2. Clean the cache, perform atomic swap, flush the cache
324  *
325  * We choose (1) since its the "easiest" to achieve here and is not
326  * dependent on the processor type.
327  *
328  * NOTE that this solution won't work on an SMP system, so explcitly
329  * forbid it here.
330  */
331 #define swp_is_buggy
332 #endif
333
334 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
335 {
336         extern void __bad_xchg(volatile void *, int);
337         unsigned long ret;
338 #ifdef swp_is_buggy
339         unsigned long flags;
340 #endif
341 #if __LINUX_ARM_ARCH__ >= 6
342         unsigned int tmp;
343 #endif
344
345         switch (size) {
346 #if __LINUX_ARM_ARCH__ >= 6
347         case 1:
348                 asm volatile("@ __xchg1\n"
349                 "1:     ldrexb  %0, [%3]\n"
350                 "       strexb  %1, %2, [%3]\n"
351                 "       teq     %1, #0\n"
352                 "       bne     1b"
353                         : "=&r" (ret), "=&r" (tmp)
354                         : "r" (x), "r" (ptr)
355                         : "memory", "cc");
356                 break;
357         case 4:
358                 asm volatile("@ __xchg4\n"
359                 "1:     ldrex   %0, [%3]\n"
360                 "       strex   %1, %2, [%3]\n"
361                 "       teq     %1, #0\n"
362                 "       bne     1b"
363                         : "=&r" (ret), "=&r" (tmp)
364                         : "r" (x), "r" (ptr)
365                         : "memory", "cc");
366                 break;
367 #elif defined(swp_is_buggy)
368 #ifdef CONFIG_SMP
369 #error SMP is not supported on this platform
370 #endif
371         case 1:
372                 local_irq_save(flags);
373                 ret = *(volatile unsigned char *)ptr;
374                 *(volatile unsigned char *)ptr = x;
375                 local_irq_restore(flags);
376                 break;
377
378         case 4:
379                 local_irq_save(flags);
380                 ret = *(volatile unsigned long *)ptr;
381                 *(volatile unsigned long *)ptr = x;
382                 local_irq_restore(flags);
383                 break;
384 #else
385         case 1:
386                 asm volatile("@ __xchg1\n"
387                 "       swpb    %0, %1, [%2]"
388                         : "=&r" (ret)
389                         : "r" (x), "r" (ptr)
390                         : "memory", "cc");
391                 break;
392         case 4:
393                 asm volatile("@ __xchg4\n"
394                 "       swp     %0, %1, [%2]"
395                         : "=&r" (ret)
396                         : "r" (x), "r" (ptr)
397                         : "memory", "cc");
398                 break;
399 #endif
400         default:
401                 __bad_xchg(ptr, size), ret = 0;
402                 break;
403         }
404
405         return ret;
406 }
407
408 #endif /* __ASSEMBLY__ */
409
410 #define arch_align_stack(x) (x)
411
412 #endif /* __KERNEL__ */
413
414 #endif