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-rw-r--r--include/asm-ppc/system.h207
1 files changed, 207 insertions, 0 deletions
diff --git a/include/asm-ppc/system.h b/include/asm-ppc/system.h
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+++ b/include/asm-ppc/system.h
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
+ */
+#ifndef __PPC_SYSTEM_H
+#define __PPC_SYSTEM_H
+
+#include <linux/config.h>
+#include <linux/kernel.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.
+ * read_barrier_depends() prevents data-dependent loads being reordered
+ * across this point (nop on PPC).
+ *
+ * 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 read_barrier_depends() do { } while(0)
+
+#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()
+#define smp_read_barrier_depends() read_barrier_depends()
+#else
+#define smp_mb() barrier()
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+#define smp_read_barrier_depends() do { } while(0)
+#endif /* CONFIG_SMP */
+
+#ifdef __KERNEL__
+struct task_struct;
+struct pt_regs;
+
+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 long _get_L3CR(void);
+extern void _set_L2CR(unsigned long);
+extern void _set_L3CR(unsigned long);
+#else
+#define _get_L2CR() 0L
+#define _get_L3CR() 0L
+#define _set_L2CR(val) do { } while(0)
+#define _set_L3CR(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 enable_kernel_altivec(void);
+extern void giveup_altivec(struct task_struct *);
+extern void load_up_altivec(struct task_struct *);
+extern void giveup_spe(struct task_struct *);
+extern void load_up_spe(struct task_struct *);
+extern int fix_alignment(struct pt_regs *);
+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 void cacheable_memzero(void *p, unsigned int nb);
+extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
+extern void bad_page_fault(struct pt_regs *, unsigned long, int);
+extern void die(const char *, struct pt_regs *, long);
+
+struct device_node;
+extern void note_scsi_host(struct device_node *, void *);
+
+extern struct task_struct *__switch_to(struct task_struct *,
+ struct task_struct *);
+#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
+
+struct thread_struct;
+extern struct task_struct *_switch(struct thread_struct *prev,
+ struct thread_struct *next);
+
+extern unsigned int rtas_data;
+
+static __inline__ unsigned long
+xchg_u32(volatile void *p, unsigned long val)
+{
+ unsigned long prev;
+
+ __asm__ __volatile__ ("\n\
+1: lwarx %0,0,%2 \n"
+ PPC405_ERR77(0,%2)
+" 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, volatile 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 unsigned int *p, unsigned int old, unsigned int new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ ("\n\
+1: lwarx %0,0,%2 \n\
+ cmpw 0,%0,%3 \n\
+ bne 2f \n"
+ PPC405_ERR77(0,%2)
+" 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))); \
+ })
+
+#define arch_align_stack(x) (x)
+
+#endif /* __KERNEL__ */
+#endif /* __PPC_SYSTEM_H */