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>
9 #include <asm/hw_irq.h>
13 * The sync instruction guarantees that all memory accesses initiated
14 * by this processor have been performed (with respect to all other
15 * mechanisms that access memory). The eieio instruction is a barrier
16 * providing an ordering (separately) for (a) cacheable stores and (b)
17 * loads and stores to non-cacheable memory (e.g. I/O devices).
19 * mb() prevents loads and stores being reordered across this point.
20 * rmb() prevents loads being reordered across this point.
21 * wmb() prevents stores being reordered across this point.
22 * read_barrier_depends() prevents data-dependent loads being reordered
23 * across this point (nop on PPC).
25 * We have to use the sync instructions for mb(), since lwsync doesn't
26 * order loads with respect to previous stores. Lwsync is fine for
27 * rmb(), though. Note that rmb() actually uses a sync on 32-bit
30 * For wmb(), we use sync since wmb is used in drivers to order
31 * stores to system memory with respect to writes to the device.
32 * However, smp_wmb() can be a lighter-weight eieio barrier on
33 * SMP since it is only used to order updates to system memory.
35 #define mb() __asm__ __volatile__ ("sync" : : : "memory")
36 #define rmb() __asm__ __volatile__ (__stringify(LWSYNC) : : : "memory")
37 #define wmb() __asm__ __volatile__ ("sync" : : : "memory")
38 #define read_barrier_depends() do { } while(0)
40 #define set_mb(var, value) do { var = value; mb(); } while (0)
43 #define AT_VECTOR_SIZE_ARCH 6 /* entries in ARCH_DLINFO */
46 #define smp_rmb() rmb()
47 #define smp_wmb() eieio()
48 #define smp_read_barrier_depends() read_barrier_depends()
50 #define smp_mb() barrier()
51 #define smp_rmb() barrier()
52 #define smp_wmb() barrier()
53 #define smp_read_barrier_depends() do { } while(0)
54 #endif /* CONFIG_SMP */
57 * This is a barrier which prevents following instructions from being
58 * started until the value of the argument x is known. For example, if
59 * x is a variable loaded from memory, this prevents following
60 * instructions from being executed until the load has been performed.
62 #define data_barrier(x) \
63 asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");
68 #ifdef CONFIG_DEBUGGER
70 extern int (*__debugger)(struct pt_regs *regs);
71 extern int (*__debugger_ipi)(struct pt_regs *regs);
72 extern int (*__debugger_bpt)(struct pt_regs *regs);
73 extern int (*__debugger_sstep)(struct pt_regs *regs);
74 extern int (*__debugger_iabr_match)(struct pt_regs *regs);
75 extern int (*__debugger_dabr_match)(struct pt_regs *regs);
76 extern int (*__debugger_fault_handler)(struct pt_regs *regs);
78 #define DEBUGGER_BOILERPLATE(__NAME) \
79 static inline int __NAME(struct pt_regs *regs) \
81 if (unlikely(__ ## __NAME)) \
82 return __ ## __NAME(regs); \
86 DEBUGGER_BOILERPLATE(debugger)
87 DEBUGGER_BOILERPLATE(debugger_ipi)
88 DEBUGGER_BOILERPLATE(debugger_bpt)
89 DEBUGGER_BOILERPLATE(debugger_sstep)
90 DEBUGGER_BOILERPLATE(debugger_iabr_match)
91 DEBUGGER_BOILERPLATE(debugger_dabr_match)
92 DEBUGGER_BOILERPLATE(debugger_fault_handler)
95 static inline int debugger(struct pt_regs *regs) { return 0; }
96 static inline int debugger_ipi(struct pt_regs *regs) { return 0; }
97 static inline int debugger_bpt(struct pt_regs *regs) { return 0; }
98 static inline int debugger_sstep(struct pt_regs *regs) { return 0; }
99 static inline int debugger_iabr_match(struct pt_regs *regs) { return 0; }
100 static inline int debugger_dabr_match(struct pt_regs *regs) { return 0; }
101 static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; }
104 extern int set_dabr(unsigned long dabr);
105 extern void print_backtrace(unsigned long *);
106 extern void show_regs(struct pt_regs * regs);
107 extern void flush_instruction_cache(void);
108 extern void hard_reset_now(void);
109 extern void poweroff_now(void);
112 extern long _get_L2CR(void);
113 extern long _get_L3CR(void);
114 extern void _set_L2CR(unsigned long);
115 extern void _set_L3CR(unsigned long);
117 #define _get_L2CR() 0L
118 #define _get_L3CR() 0L
119 #define _set_L2CR(val) do { } while(0)
120 #define _set_L3CR(val) do { } while(0)
123 extern void via_cuda_init(void);
124 extern void read_rtc_time(void);
125 extern void pmac_find_display(void);
126 extern void giveup_fpu(struct task_struct *);
127 extern void disable_kernel_fp(void);
128 extern void enable_kernel_fp(void);
129 extern void flush_fp_to_thread(struct task_struct *);
130 extern void enable_kernel_altivec(void);
131 extern void giveup_altivec(struct task_struct *);
132 extern void load_up_altivec(struct task_struct *);
133 extern int emulate_altivec(struct pt_regs *);
134 extern void enable_kernel_spe(void);
135 extern void giveup_spe(struct task_struct *);
136 extern void load_up_spe(struct task_struct *);
137 extern int fix_alignment(struct pt_regs *);
138 extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
139 extern void cvt_df(double *from, float *to, struct thread_struct *thread);
142 extern void discard_lazy_cpu_state(void);
144 static inline void discard_lazy_cpu_state(void)
149 #ifdef CONFIG_ALTIVEC
150 extern void flush_altivec_to_thread(struct task_struct *);
152 static inline void flush_altivec_to_thread(struct task_struct *t)
158 extern void flush_spe_to_thread(struct task_struct *);
160 static inline void flush_spe_to_thread(struct task_struct *t)
165 extern int call_rtas(const char *, int, int, unsigned long *, ...);
166 extern void cacheable_memzero(void *p, unsigned int nb);
167 extern void *cacheable_memcpy(void *, const void *, unsigned int);
168 extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
169 extern void bad_page_fault(struct pt_regs *, unsigned long, int);
170 extern int die(const char *, struct pt_regs *, long);
171 extern void _exception(int, struct pt_regs *, int, unsigned long);
172 #ifdef CONFIG_BOOKE_WDT
173 extern u32 booke_wdt_enabled;
174 extern u32 booke_wdt_period;
175 #endif /* CONFIG_BOOKE_WDT */
178 extern void note_scsi_host(struct device_node *, void *);
180 extern struct task_struct *__switch_to(struct task_struct *,
181 struct task_struct *);
182 #define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
184 struct thread_struct;
185 extern struct task_struct *_switch(struct thread_struct *prev,
186 struct thread_struct *next);
188 extern unsigned int rtas_data;
189 extern int mem_init_done; /* set on boot once kmalloc can be called */
190 extern unsigned long memory_limit;
191 extern unsigned long klimit;
193 extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
194 extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
196 extern int powersave_nap; /* set if nap mode can be used in idle loop */
201 * Changes the memory location '*ptr' to be val and returns
202 * the previous value stored there.
204 static __inline__ unsigned long
205 __xchg_u32(volatile void *p, unsigned long val)
209 __asm__ __volatile__(
211 "1: lwarx %0,0,%2 \n"
216 : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
226 * Changes the memory location '*ptr' to be val and returns
227 * the previous value stored there.
229 static __inline__ unsigned long
230 __xchg_u32_local(volatile void *p, unsigned long val)
234 __asm__ __volatile__(
235 "1: lwarx %0,0,%2 \n"
239 : "=&r" (prev), "+m" (*(volatile unsigned int *)p)
247 static __inline__ unsigned long
248 __xchg_u64(volatile void *p, unsigned long val)
252 __asm__ __volatile__(
254 "1: ldarx %0,0,%2 \n"
259 : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
266 static __inline__ unsigned long
267 __xchg_u64_local(volatile void *p, unsigned long val)
271 __asm__ __volatile__(
272 "1: ldarx %0,0,%2 \n"
276 : "=&r" (prev), "+m" (*(volatile unsigned long *)p)
285 * This function doesn't exist, so you'll get a linker error
286 * if something tries to do an invalid xchg().
288 extern void __xchg_called_with_bad_pointer(void);
290 static __inline__ unsigned long
291 __xchg(volatile void *ptr, unsigned long x, unsigned int size)
295 return __xchg_u32(ptr, x);
298 return __xchg_u64(ptr, x);
301 __xchg_called_with_bad_pointer();
305 static __inline__ unsigned long
306 __xchg_local(volatile void *ptr, unsigned long x, unsigned int size)
310 return __xchg_u32_local(ptr, x);
313 return __xchg_u64_local(ptr, x);
316 __xchg_called_with_bad_pointer();
319 #define xchg(ptr,x) \
321 __typeof__(*(ptr)) _x_ = (x); \
322 (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
325 #define xchg_local(ptr,x) \
327 __typeof__(*(ptr)) _x_ = (x); \
328 (__typeof__(*(ptr))) __xchg_local((ptr), \
329 (unsigned long)_x_, sizeof(*(ptr))); \
333 * Compare and exchange - if *p == old, set it to new,
334 * and return the old value of *p.
336 #define __HAVE_ARCH_CMPXCHG 1
338 static __inline__ unsigned long
339 __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
343 __asm__ __volatile__ (
345 "1: lwarx %0,0,%2 # __cmpxchg_u32\n\
354 : "=&r" (prev), "+m" (*p)
355 : "r" (p), "r" (old), "r" (new)
361 static __inline__ unsigned long
362 __cmpxchg_u32_local(volatile unsigned int *p, unsigned long old,
367 __asm__ __volatile__ (
368 "1: lwarx %0,0,%2 # __cmpxchg_u32\n\
376 : "=&r" (prev), "+m" (*p)
377 : "r" (p), "r" (old), "r" (new)
384 static __inline__ unsigned long
385 __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)
389 __asm__ __volatile__ (
391 "1: ldarx %0,0,%2 # __cmpxchg_u64\n\
399 : "=&r" (prev), "+m" (*p)
400 : "r" (p), "r" (old), "r" (new)
406 static __inline__ unsigned long
407 __cmpxchg_u64_local(volatile unsigned long *p, unsigned long old,
412 __asm__ __volatile__ (
413 "1: ldarx %0,0,%2 # __cmpxchg_u64\n\
420 : "=&r" (prev), "+m" (*p)
421 : "r" (p), "r" (old), "r" (new)
428 /* This function doesn't exist, so you'll get a linker error
429 if something tries to do an invalid cmpxchg(). */
430 extern void __cmpxchg_called_with_bad_pointer(void);
432 static __inline__ unsigned long
433 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
438 return __cmpxchg_u32(ptr, old, new);
441 return __cmpxchg_u64(ptr, old, new);
444 __cmpxchg_called_with_bad_pointer();
448 static __inline__ unsigned long
449 __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
454 return __cmpxchg_u32_local(ptr, old, new);
457 return __cmpxchg_u64_local(ptr, old, new);
460 __cmpxchg_called_with_bad_pointer();
464 #define cmpxchg(ptr,o,n) \
466 __typeof__(*(ptr)) _o_ = (o); \
467 __typeof__(*(ptr)) _n_ = (n); \
468 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
469 (unsigned long)_n_, sizeof(*(ptr))); \
473 #define cmpxchg_local(ptr,o,n) \
475 __typeof__(*(ptr)) _o_ = (o); \
476 __typeof__(*(ptr)) _n_ = (n); \
477 (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
478 (unsigned long)_n_, sizeof(*(ptr))); \
483 * We handle most unaligned accesses in hardware. On the other hand
484 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
485 * powers of 2 writes until it reaches sufficient alignment).
487 * Based on this we disable the IP header alignment in network drivers.
488 * We also modify NET_SKB_PAD to be a cacheline in size, thus maintaining
489 * cacheline alignment of buffers.
491 #define NET_IP_ALIGN 0
492 #define NET_SKB_PAD L1_CACHE_BYTES
495 #define arch_align_stack(x) (x)
497 /* Used in very early kernel initialization. */
498 extern unsigned long reloc_offset(void);
499 extern unsigned long add_reloc_offset(unsigned long);
500 extern void reloc_got2(unsigned long);
502 #define PTRRELOC(x) ((typeof(x)) add_reloc_offset((unsigned long)(x)))
504 static inline void create_instruction(unsigned long addr, unsigned int instr)
507 p = (unsigned int *)addr;
509 asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p));
512 /* Flags for create_branch:
513 * "b" == create_branch(addr, target, 0);
514 * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE);
515 * "bl" == create_branch(addr, target, BRANCH_SET_LINK);
516 * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK);
518 #define BRANCH_SET_LINK 0x1
519 #define BRANCH_ABSOLUTE 0x2
521 static inline void create_branch(unsigned long addr,
522 unsigned long target, int flags)
524 unsigned int instruction;
526 if (! (flags & BRANCH_ABSOLUTE))
527 target = target - addr;
529 /* Mask out the flags and target, so they don't step on each other. */
530 instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
532 create_instruction(addr, instruction);
535 static inline void create_function_call(unsigned long addr, void * func)
537 unsigned long func_addr;
541 * On PPC64 the function pointer actually points to the function's
542 * descriptor. The first entry in the descriptor is the address
543 * of the function text.
545 func_addr = *(unsigned long *)func;
547 func_addr = (unsigned long)func;
549 create_branch(addr, func_addr, BRANCH_SET_LINK);
552 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
553 extern void account_system_vtime(struct task_struct *);
556 extern struct dentry *powerpc_debugfs_root;
558 #endif /* __KERNEL__ */
559 #endif /* _ASM_POWERPC_SYSTEM_H */