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- #ifndef __PPC_SYSTEM_H
- #define __PPC_SYSTEM_H
-
- #include <linux/kdev_t.h>
- #include <asm/processor.h>
- #include <asm/atomic.h>
-
- /*
- * Memory barrier.
- * The sync instruction guarantees that all memory accesses initiated
- * by this processor have been performed (with respect to all other
- * mechanisms that access memory). The eieio instruction is a barrier
- * providing an ordering (separately) for (a) cacheable stores and (b)
- * loads and stores to non-cacheable memory (e.g. I/O devices).
- *
- * mb() prevents loads and stores being reordered across this point.
- * rmb() prevents loads being reordered across this point.
- * wmb() prevents stores being reordered across this point.
- *
- * We can use the eieio instruction for wmb, but since it doesn't
- * give any ordering guarantees about loads, we have to use the
- * stronger but slower sync instruction for mb and rmb.
- */
- #define mb() __asm__ __volatile__ ("sync" : : : "memory")
- #define rmb() __asm__ __volatile__ ("sync" : : : "memory")
- #define wmb() __asm__ __volatile__ ("eieio" : : : "memory")
-
- #define __save_flags(flags) ({\
- __asm__ __volatile__ ("mfmsr %0" : "=r" ((flags)) : : "memory"); })
- #define __save_and_cli(flags) ({__save_flags(flags);__cli();})
-
- /* Data cache block flush - write out the cache line containing the
- specified address and then invalidate it in the cache. */
- extern __inline__ void dcbf(void *line)
- {
- asm("dcbf %0,%1; sync" : : "r" (line), "r" (0));
- }
-
- extern __inline__ void __restore_flags(unsigned long flags)
- {
- extern atomic_t n_lost_interrupts;
- extern void do_lost_interrupts(unsigned long);
-
- if ((flags & MSR_EE) && atomic_read(&n_lost_interrupts) != 0) {
- do_lost_interrupts(flags);
- } else {
- __asm__ __volatile__ ("sync; mtmsr %0; isync"
- : : "r" (flags) : "memory");
- }
- }
-
-
- extern void __sti(void);
- extern void __cli(void);
- extern int _disable_interrupts(void);
- extern void _enable_interrupts(int);
-
- extern void instruction_dump(unsigned long *);
- extern void print_backtrace(unsigned long *);
- extern void show_regs(struct pt_regs * regs);
- extern void flush_instruction_cache(void);
- extern void hard_reset_now(void);
- extern void poweroff_now(void);
- extern int _get_PVR(void);
- extern long _get_L2CR(void);
- extern void _set_L2CR(unsigned long);
- extern void via_cuda_init(void);
- extern void pmac_nvram_init(void);
- extern void read_rtc_time(void);
- extern void pmac_find_display(void);
- extern void giveup_fpu(void);
- extern void smp_giveup_fpu(struct task_struct *);
- extern void cvt_fd(float *from, double *to, unsigned long *fpscr);
- extern void cvt_df(double *from, float *to, unsigned long *fpscr);
-
- struct device_node;
- extern void note_scsi_host(struct device_node *, void *);
-
- struct task_struct;
- extern void switch_to(struct task_struct *prev, struct task_struct *next);
-
- struct thread_struct;
- extern void _switch(struct thread_struct *prev, struct thread_struct *next,
- unsigned long context);
-
- struct pt_regs;
- extern void dump_regs(struct pt_regs *);
-
- #ifndef __SMP__
-
- #define cli() __cli()
- #define sti() __sti()
- #define save_flags(flags) __save_flags(flags)
- #define restore_flags(flags) __restore_flags(flags)
- #define save_and_cli(flags) __save_and_cli(flags)
-
- #else /* __SMP__ */
-
- extern void __global_cli(void);
- extern void __global_sti(void);
- extern unsigned long __global_save_flags(void);
- extern void __global_restore_flags(unsigned long);
- #define cli() __global_cli()
- #define sti() __global_sti()
- #define save_flags(x) ((x)=__global_save_flags())
- #define restore_flags(x) __global_restore_flags(x)
-
- #endif /* !__SMP__ */
-
- #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-
- extern unsigned long xchg_u64(void *ptr, unsigned long val);
- extern unsigned long xchg_u32(void *ptr, unsigned long val);
-
- /*
- * This function doesn't exist, so you'll get a linker error
- * if something tries to do an invalid xchg().
- *
- * This only works if the compiler isn't horribly bad at optimizing.
- * gcc-2.5.8 reportedly can't handle this, but as that doesn't work
- * too well on the alpha anyway..
- */
- extern void __xchg_called_with_bad_pointer(void);
-
- #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
- #define tas(ptr) (xchg((ptr),1))
-
- static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
- {
- switch (size) {
- case 4:
- return (unsigned long )xchg_u32(ptr, x);
- case 8:
- return (unsigned long )xchg_u64(ptr, x);
- }
- __xchg_called_with_bad_pointer();
- return x;
-
-
- }
-
- extern inline void * xchg_ptr(void * m, void * val)
- {
- return (void *) xchg_u32(m, (unsigned long) val);
- }
-
- #endif
-