2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
4 #ifndef _ASM_POWERPC_SYSTEM_H
5 #define _ASM_POWERPC_SYSTEM_H
7 #include <linux/kernel.h>
8 #include <linux/irqflags.h>
10 #include <asm/hw_irq.h>
14 * The sync instruction guarantees that all memory accesses initiated
15 * by this processor have been performed (with respect to all other
16 * mechanisms that access memory). The eieio instruction is a barrier
17 * providing an ordering (separately) for (a) cacheable stores and (b)
18 * loads and stores to non-cacheable memory (e.g. I/O devices).
20 * mb() prevents loads and stores being reordered across this point.
21 * rmb() prevents loads being reordered across this point.
22 * wmb() prevents stores being reordered across this point.
23 * read_barrier_depends() prevents data-dependent loads being reordered
24 * across this point (nop on PPC).
26 * We have to use the sync instructions for mb(), since lwsync doesn't
27 * order loads with respect to previous stores. Lwsync is fine for
28 * rmb(), though. Note that rmb() actually uses a sync on 32-bit
31 * For wmb(), we use sync since wmb is used in drivers to order
32 * stores to system memory with respect to writes to the device.
33 * However, smp_wmb() can be a lighter-weight lwsync or eieio barrier
34 * on SMP since it is only used to order updates to system memory.
36 #define mb() __asm__ __volatile__ ("sync" : : : "memory")
37 #define rmb() __asm__ __volatile__ ("sync" : : : "memory")
38 #define wmb() __asm__ __volatile__ ("sync" : : : "memory")
39 #define read_barrier_depends() do { } while(0)
41 #define set_mb(var, value) do { var = value; mb(); } while (0)
44 #define AT_VECTOR_SIZE_ARCH 6 /* entries in ARCH_DLINFO */
47 #ifdef __SUBARCH_HAS_LWSYNC
48 # define SMPWMB lwsync
54 #define smp_rmb() rmb()
55 #define smp_wmb() __asm__ __volatile__ (__stringify(SMPWMB) : : :"memory")
56 #define smp_read_barrier_depends() read_barrier_depends()
58 #define smp_mb() barrier()
59 #define smp_rmb() barrier()
60 #define smp_wmb() barrier()
61 #define smp_read_barrier_depends() do { } while(0)
62 #endif /* CONFIG_SMP */
65 * This is a barrier which prevents following instructions from being
66 * started until the value of the argument x is known. For example, if
67 * x is a variable loaded from memory, this prevents following
68 * instructions from being executed until the load has been performed.
70 #define data_barrier(x) \
71 asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");
76 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
78 extern int (*__debugger)(struct pt_regs *regs);
79 extern int (*__debugger_ipi)(struct pt_regs *regs);
80 extern int (*__debugger_bpt)(struct pt_regs *regs);
81 extern int (*__debugger_sstep)(struct pt_regs *regs);
82 extern int (*__debugger_iabr_match)(struct pt_regs *regs);
83 extern int (*__debugger_dabr_match)(struct pt_regs *regs);
84 extern int (*__debugger_fault_handler)(struct pt_regs *regs);
86 #define DEBUGGER_BOILERPLATE(__NAME) \
87 static inline int __NAME(struct pt_regs *regs) \
89 if (unlikely(__ ## __NAME)) \
90 return __ ## __NAME(regs); \
94 DEBUGGER_BOILERPLATE(debugger)
95 DEBUGGER_BOILERPLATE(debugger_ipi)
96 DEBUGGER_BOILERPLATE(debugger_bpt)
97 DEBUGGER_BOILERPLATE(debugger_sstep)
98 DEBUGGER_BOILERPLATE(debugger_iabr_match)
99 DEBUGGER_BOILERPLATE(debugger_dabr_match)
100 DEBUGGER_BOILERPLATE(debugger_fault_handler)
103 static inline int debugger(struct pt_regs *regs) { return 0; }
104 static inline int debugger_ipi(struct pt_regs *regs) { return 0; }
105 static inline int debugger_bpt(struct pt_regs *regs) { return 0; }
106 static inline int debugger_sstep(struct pt_regs *regs) { return 0; }
107 static inline int debugger_iabr_match(struct pt_regs *regs) { return 0; }
108 static inline int debugger_dabr_match(struct pt_regs *regs) { return 0; }
109 static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; }
112 extern int set_dabr(unsigned long dabr);
113 extern void print_backtrace(unsigned long *);
114 extern void show_regs(struct pt_regs * regs);
115 extern void flush_instruction_cache(void);
116 extern void hard_reset_now(void);
117 extern void poweroff_now(void);
120 extern long _get_L2CR(void);
121 extern long _get_L3CR(void);
122 extern void _set_L2CR(unsigned long);
123 extern void _set_L3CR(unsigned long);
125 #define _get_L2CR() 0L
126 #define _get_L3CR() 0L
127 #define _set_L2CR(val) do { } while(0)
128 #define _set_L3CR(val) do { } while(0)
131 extern void via_cuda_init(void);
132 extern void read_rtc_time(void);
133 extern void pmac_find_display(void);
134 extern void giveup_fpu(struct task_struct *);
135 extern void disable_kernel_fp(void);
136 extern void enable_kernel_fp(void);
137 extern void flush_fp_to_thread(struct task_struct *);
138 extern void enable_kernel_altivec(void);
139 extern void giveup_altivec(struct task_struct *);
140 extern void load_up_altivec(struct task_struct *);
141 extern int emulate_altivec(struct pt_regs *);
142 extern void __giveup_vsx(struct task_struct *);
143 extern void giveup_vsx(struct task_struct *);
144 extern void enable_kernel_spe(void);
145 extern void giveup_spe(struct task_struct *);
146 extern void load_up_spe(struct task_struct *);
147 extern int fix_alignment(struct pt_regs *);
148 extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
149 extern void cvt_df(double *from, float *to, struct thread_struct *thread);
152 extern void discard_lazy_cpu_state(void);
154 static inline void discard_lazy_cpu_state(void)
159 #ifdef CONFIG_ALTIVEC
160 extern void flush_altivec_to_thread(struct task_struct *);
162 static inline void flush_altivec_to_thread(struct task_struct *t)
168 extern void flush_vsx_to_thread(struct task_struct *);
170 static inline void flush_vsx_to_thread(struct task_struct *t)
176 extern void flush_spe_to_thread(struct task_struct *);
178 static inline void flush_spe_to_thread(struct task_struct *t)
183 extern int call_rtas(const char *, int, int, unsigned long *, ...);
184 extern void cacheable_memzero(void *p, unsigned int nb);
185 extern void *cacheable_memcpy(void *, const void *, unsigned int);
186 extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
187 extern void bad_page_fault(struct pt_regs *, unsigned long, int);
188 extern int die(const char *, struct pt_regs *, long);
189 extern void _exception(int, struct pt_regs *, int, unsigned long);
190 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
192 #ifdef CONFIG_BOOKE_WDT
193 extern u32 booke_wdt_enabled;
194 extern u32 booke_wdt_period;
195 #endif /* CONFIG_BOOKE_WDT */
198 extern void note_scsi_host(struct device_node *, void *);
200 extern struct task_struct *__switch_to(struct task_struct *,
201 struct task_struct *);
202 #define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
204 struct thread_struct;
205 extern struct task_struct *_switch(struct thread_struct *prev,
206 struct thread_struct *next);
208 extern unsigned int rtas_data;
209 extern int mem_init_done; /* set on boot once kmalloc can be called */
210 extern int init_bootmem_done; /* set on !NUMA once bootmem is available */
211 extern unsigned long memory_limit;
212 extern unsigned long klimit;
214 extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
215 extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
217 extern int powersave_nap; /* set if nap mode can be used in idle loop */
222 * Changes the memory location '*ptr' to be val and returns
223 * the previous value stored there.
225 static __always_inline unsigned long
226 __xchg_u32(volatile void *p, unsigned long val)
230 __asm__ __volatile__(
232 "1: lwarx %0,0,%2 \n"
237 : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
247 * Changes the memory location '*ptr' to be val and returns
248 * the previous value stored there.
250 static __always_inline unsigned long
251 __xchg_u32_local(volatile void *p, unsigned long val)
255 __asm__ __volatile__(
256 "1: lwarx %0,0,%2 \n"
260 : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
268 static __always_inline unsigned long
269 __xchg_u64(volatile void *p, unsigned long val)
273 __asm__ __volatile__(
275 "1: ldarx %0,0,%2 \n"
280 : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
287 static __always_inline unsigned long
288 __xchg_u64_local(volatile void *p, unsigned long val)
292 __asm__ __volatile__(
293 "1: ldarx %0,0,%2 \n"
297 : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
306 * This function doesn't exist, so you'll get a linker error
307 * if something tries to do an invalid xchg().
309 extern void __xchg_called_with_bad_pointer(void);
311 static __always_inline unsigned long
312 __xchg(volatile void *ptr, unsigned long x, unsigned int size)
316 return __xchg_u32(ptr, x);
319 return __xchg_u64(ptr, x);
322 __xchg_called_with_bad_pointer();
326 static __always_inline unsigned long
327 __xchg_local(volatile void *ptr, unsigned long x, unsigned int size)
331 return __xchg_u32_local(ptr, x);
334 return __xchg_u64_local(ptr, x);
337 __xchg_called_with_bad_pointer();
340 #define xchg(ptr,x) \
342 __typeof__(*(ptr)) _x_ = (x); \
343 (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
346 #define xchg_local(ptr,x) \
348 __typeof__(*(ptr)) _x_ = (x); \
349 (__typeof__(*(ptr))) __xchg_local((ptr), \
350 (unsigned long)_x_, sizeof(*(ptr))); \
354 * Compare and exchange - if *p == old, set it to new,
355 * and return the old value of *p.
357 #define __HAVE_ARCH_CMPXCHG 1
359 static __always_inline unsigned long
360 __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
364 __asm__ __volatile__ (
366 "1: lwarx %0,0,%2 # __cmpxchg_u32\n\
375 : "=&r" (prev), "+m" (*p)
376 : "r" (p), "r" (old), "r" (new)
382 static __always_inline unsigned long
383 __cmpxchg_u32_local(volatile unsigned int *p, unsigned long old,
388 __asm__ __volatile__ (
389 "1: lwarx %0,0,%2 # __cmpxchg_u32\n\
397 : "=&r" (prev), "+m" (*p)
398 : "r" (p), "r" (old), "r" (new)
405 static __always_inline unsigned long
406 __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)
410 __asm__ __volatile__ (
412 "1: ldarx %0,0,%2 # __cmpxchg_u64\n\
420 : "=&r" (prev), "+m" (*p)
421 : "r" (p), "r" (old), "r" (new)
427 static __always_inline unsigned long
428 __cmpxchg_u64_local(volatile unsigned long *p, unsigned long old,
433 __asm__ __volatile__ (
434 "1: ldarx %0,0,%2 # __cmpxchg_u64\n\
441 : "=&r" (prev), "+m" (*p)
442 : "r" (p), "r" (old), "r" (new)
449 /* This function doesn't exist, so you'll get a linker error
450 if something tries to do an invalid cmpxchg(). */
451 extern void __cmpxchg_called_with_bad_pointer(void);
453 static __always_inline unsigned long
454 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
459 return __cmpxchg_u32(ptr, old, new);
462 return __cmpxchg_u64(ptr, old, new);
465 __cmpxchg_called_with_bad_pointer();
469 static __always_inline unsigned long
470 __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
475 return __cmpxchg_u32_local(ptr, old, new);
478 return __cmpxchg_u64_local(ptr, old, new);
481 __cmpxchg_called_with_bad_pointer();
485 #define cmpxchg(ptr, o, n) \
487 __typeof__(*(ptr)) _o_ = (o); \
488 __typeof__(*(ptr)) _n_ = (n); \
489 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
490 (unsigned long)_n_, sizeof(*(ptr))); \
494 #define cmpxchg_local(ptr, o, n) \
496 __typeof__(*(ptr)) _o_ = (o); \
497 __typeof__(*(ptr)) _n_ = (n); \
498 (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
499 (unsigned long)_n_, sizeof(*(ptr))); \
504 * We handle most unaligned accesses in hardware. On the other hand
505 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
506 * powers of 2 writes until it reaches sufficient alignment).
508 * Based on this we disable the IP header alignment in network drivers.
509 * We also modify NET_SKB_PAD to be a cacheline in size, thus maintaining
510 * cacheline alignment of buffers.
512 #define NET_IP_ALIGN 0
513 #define NET_SKB_PAD L1_CACHE_BYTES
515 #define cmpxchg64(ptr, o, n) \
517 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
518 cmpxchg((ptr), (o), (n)); \
520 #define cmpxchg64_local(ptr, o, n) \
522 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
523 cmpxchg_local((ptr), (o), (n)); \
526 #include <asm-generic/cmpxchg-local.h>
527 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
530 #define arch_align_stack(x) (x)
532 /* Used in very early kernel initialization. */
533 extern unsigned long reloc_offset(void);
534 extern unsigned long add_reloc_offset(unsigned long);
535 extern void reloc_got2(unsigned long);
537 #define PTRRELOC(x) ((typeof(x)) add_reloc_offset((unsigned long)(x)))
539 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
540 extern void account_system_vtime(struct task_struct *);
543 extern struct dentry *powerpc_debugfs_root;
545 #endif /* __KERNEL__ */
546 #endif /* _ASM_POWERPC_SYSTEM_H */