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/*
* BK Id: SCCS/s.system.h 1.14 08/20/01 14:34:41 paulus
*/
/*
* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
*/
#ifndef __PPC_SYSTEM_H
#define __PPC_SYSTEM_H
#include <linux/config.h>
#include <linux/kdev_t.h>
#include <asm/processor.h>
#include <asm/atomic.h>
#include <asm/hw_irq.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 set_mb(var, value) do { var = value; mb(); } while (0)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#else
#define smp_mb() __asm__ __volatile__("": : :"memory")
#define smp_rmb() __asm__ __volatile__("": : :"memory")
#define smp_wmb() __asm__ __volatile__("": : :"memory")
#endif /* CONFIG_SMP */
#ifdef __KERNEL__
extern void xmon_irq(int, void *, struct pt_regs *);
extern void xmon(struct pt_regs *excp);
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);
#ifdef CONFIG_6xx
extern long _get_L2CR(void);
extern void _set_L2CR(unsigned long);
#else
#define _get_L2CR() 0
#define _set_L2CR(val) do { } while(0)
#endif
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(struct task_struct *);
extern void enable_kernel_fp(void);
extern void giveup_altivec(struct task_struct *);
extern void load_up_altivec(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);
extern int call_rtas(const char *, int, int, unsigned long *, ...);
extern int abs(int);
extern void cacheable_memzero(void *p, unsigned int nb);
struct device_node;
extern void note_scsi_host(struct device_node *, void *);
struct task_struct;
#define prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) _switch_to((prev),(next),&(last))
extern void _switch_to(struct task_struct *, struct task_struct *,
struct task_struct **);
struct thread_struct;
extern struct task_struct *_switch(struct thread_struct *prev,
struct thread_struct *next);
extern unsigned int rtas_data;
struct pt_regs;
extern void dump_regs(struct pt_regs *);
#ifndef CONFIG_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 /* CONFIG_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 /* !CONFIG_SMP */
#define local_irq_disable() __cli()
#define local_irq_enable() __sti()
#define local_irq_save(flags) __save_and_cli(flags)
#define local_irq_restore(flags) __restore_flags(flags)
#endif /* __KERNEL__ */
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
static __inline__ unsigned long
xchg_u32(volatile void *p, unsigned long val)
{
unsigned long prev;
__asm__ __volatile__ ("\n\
1: lwarx %0,0,%2 \n\
stwcx. %3,0,%2 \n\
bne- 1b"
: "=&r" (prev), "=m" (*(volatile unsigned long *)p)
: "r" (p), "r" (val), "m" (*(volatile unsigned long *)p)
: "cc", "memory");
return prev;
}
/*
* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid xchg().
*/
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);
#if 0 /* xchg_u64 doesn't exist on 32-bit PPC */
case 8:
return (unsigned long )xchg_u64(ptr, x);
#endif /* 0 */
}
__xchg_called_with_bad_pointer();
return x;
}
extern inline void * xchg_ptr(void * m, void * val)
{
return (void *) xchg_u32(m, (unsigned long) val);
}
#define __HAVE_ARCH_CMPXCHG 1
static __inline__ unsigned long
__cmpxchg_u32(volatile int *p, int old, int new)
{
int prev;
__asm__ __volatile__ ("\n\
1: lwarx %0,0,%2 \n\
cmpw 0,%0,%3 \n\
bne 2f \n\
stwcx. %4,0,%2 \n\
bne- 1b\n"
#ifdef CONFIG_SMP
" sync\n"
#endif /* CONFIG_SMP */
"2:"
: "=&r" (prev), "=m" (*p)
: "r" (p), "r" (old), "r" (new), "m" (*p)
: "cc", "memory");
return prev;
}
/* This function doesn't exist, so you'll get a linker error
if something tries to do an invalid cmpxchg(). */
extern void __cmpxchg_called_with_bad_pointer(void);
static __inline__ unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
switch (size) {
case 4:
return __cmpxchg_u32(ptr, old, new);
#if 0 /* we don't have __cmpxchg_u64 on 32-bit PPC */
case 8:
return __cmpxchg_u64(ptr, old, new);
#endif /* 0 */
}
__cmpxchg_called_with_bad_pointer();
return old;
}
#define cmpxchg(ptr,o,n) \
({ \
__typeof__(*(ptr)) _o_ = (o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
})
#endif /* __PPC_SYSTEM_H */
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