2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
7 #include <linux/config.h>
8 #include <linux/kernel.h>
10 #include <asm/atomic.h>
11 #include <asm/hw_irq.h>
15 * The sync instruction guarantees that all memory accesses initiated
16 * by this processor have been performed (with respect to all other
17 * mechanisms that access memory). The eieio instruction is a barrier
18 * providing an ordering (separately) for (a) cacheable stores and (b)
19 * loads and stores to non-cacheable memory (e.g. I/O devices).
21 * mb() prevents loads and stores being reordered across this point.
22 * rmb() prevents loads being reordered across this point.
23 * wmb() prevents stores being reordered across this point.
24 * read_barrier_depends() prevents data-dependent loads being reordered
25 * across this point (nop on PPC).
27 * We can use the eieio instruction for wmb, but since it doesn't
28 * give any ordering guarantees about loads, we have to use the
29 * stronger but slower sync instruction for mb and rmb.
31 #define mb() __asm__ __volatile__ ("sync" : : : "memory")
32 #define rmb() __asm__ __volatile__ ("sync" : : : "memory")
33 #define wmb() __asm__ __volatile__ ("eieio" : : : "memory")
34 #define read_barrier_depends() do { } while(0)
36 #define set_mb(var, value) do { var = value; mb(); } while (0)
37 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
41 #define smp_rmb() rmb()
42 #define smp_wmb() wmb()
43 #define smp_read_barrier_depends() read_barrier_depends()
45 #define smp_mb() barrier()
46 #define smp_rmb() barrier()
47 #define smp_wmb() barrier()
48 #define smp_read_barrier_depends() do { } while(0)
49 #endif /* CONFIG_SMP */
55 extern void print_backtrace(unsigned long *);
56 extern void show_regs(struct pt_regs * regs);
57 extern void flush_instruction_cache(void);
58 extern void hard_reset_now(void);
59 extern void poweroff_now(void);
61 extern long _get_L2CR(void);
62 extern long _get_L3CR(void);
63 extern void _set_L2CR(unsigned long);
64 extern void _set_L3CR(unsigned long);
66 #define _get_L2CR() 0L
67 #define _get_L3CR() 0L
68 #define _set_L2CR(val) do { } while(0)
69 #define _set_L3CR(val) do { } while(0)
71 extern void via_cuda_init(void);
72 extern void pmac_nvram_init(void);
73 extern void read_rtc_time(void);
74 extern void pmac_find_display(void);
75 extern void giveup_fpu(struct task_struct *);
76 extern void enable_kernel_fp(void);
77 extern void flush_fp_to_thread(struct task_struct *);
78 extern void enable_kernel_altivec(void);
79 extern void giveup_altivec(struct task_struct *);
80 extern void load_up_altivec(struct task_struct *);
81 extern int emulate_altivec(struct pt_regs *);
82 extern void giveup_spe(struct task_struct *);
83 extern void load_up_spe(struct task_struct *);
84 extern int fix_alignment(struct pt_regs *);
85 extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
86 extern void cvt_df(double *from, float *to, struct thread_struct *thread);
89 extern void flush_altivec_to_thread(struct task_struct *);
91 static inline void flush_altivec_to_thread(struct task_struct *t)
97 extern void flush_spe_to_thread(struct task_struct *);
99 static inline void flush_spe_to_thread(struct task_struct *t)
104 extern int call_rtas(const char *, int, int, unsigned long *, ...);
105 extern void cacheable_memzero(void *p, unsigned int nb);
106 extern void *cacheable_memcpy(void *, const void *, unsigned int);
107 extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
108 extern void bad_page_fault(struct pt_regs *, unsigned long, int);
109 extern int die(const char *, struct pt_regs *, long);
110 extern void _exception(int, struct pt_regs *, int, unsigned long);
111 void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
113 #ifdef CONFIG_BOOKE_WDT
114 extern u32 booke_wdt_enabled;
115 extern u32 booke_wdt_period;
116 #endif /* CONFIG_BOOKE_WDT */
119 extern void note_scsi_host(struct device_node *, void *);
121 extern struct task_struct *__switch_to(struct task_struct *,
122 struct task_struct *);
123 #define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
125 struct thread_struct;
126 extern struct task_struct *_switch(struct thread_struct *prev,
127 struct thread_struct *next);
129 extern unsigned int rtas_data;
131 static __inline__ unsigned long
132 xchg_u32(volatile void *p, unsigned long val)
136 __asm__ __volatile__ ("\n\
141 : "=&r" (prev), "=m" (*(volatile unsigned long *)p)
142 : "r" (p), "r" (val), "m" (*(volatile unsigned long *)p)
149 * This function doesn't exist, so you'll get a linker error
150 * if something tries to do an invalid xchg().
152 extern void __xchg_called_with_bad_pointer(void);
154 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
155 #define tas(ptr) (xchg((ptr),1))
157 static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
161 return (unsigned long) xchg_u32(ptr, x);
162 #if 0 /* xchg_u64 doesn't exist on 32-bit PPC */
164 return (unsigned long) xchg_u64(ptr, x);
167 __xchg_called_with_bad_pointer();
173 extern inline void * xchg_ptr(void * m, void * val)
175 return (void *) xchg_u32(m, (unsigned long) val);
179 #define __HAVE_ARCH_CMPXCHG 1
181 static __inline__ unsigned long
182 __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
186 __asm__ __volatile__ ("\n\
195 #endif /* CONFIG_SMP */
197 : "=&r" (prev), "=m" (*p)
198 : "r" (p), "r" (old), "r" (new), "m" (*p)
204 /* This function doesn't exist, so you'll get a linker error
205 if something tries to do an invalid cmpxchg(). */
206 extern void __cmpxchg_called_with_bad_pointer(void);
208 static __inline__ unsigned long
209 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
213 return __cmpxchg_u32(ptr, old, new);
214 #if 0 /* we don't have __cmpxchg_u64 on 32-bit PPC */
216 return __cmpxchg_u64(ptr, old, new);
219 __cmpxchg_called_with_bad_pointer();
223 #define cmpxchg(ptr,o,n) \
225 __typeof__(*(ptr)) _o_ = (o); \
226 __typeof__(*(ptr)) _n_ = (n); \
227 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
228 (unsigned long)_n_, sizeof(*(ptr))); \
231 #define arch_align_stack(x) (x)
233 #endif /* __KERNEL__ */
234 #endif /* __PPC_SYSTEM_H */