patch-2.4.19 linux-2.4.19/include/asm-ppc64/system.h

• Lines: 275
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-ppc64/system.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-ppc64/system.h linux-2.4.19/include/asm-ppc64/system.h
@@ -0,0 +1,274 @@
+#ifndef __PPC64_SYSTEM_H
+#define __PPC64_SYSTEM_H
+
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/kdev_t.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/hw_irq.h>
+#include <asm/memory.h>
+
+/*
+ * System defines.
+ */
+#define KERNEL_START_PHYS	0x800000 
+#define KERNEL_START	        (PAGE_OFFSET+KERNEL_START_PHYS)
+#define START_ADDR	        (PAGE_OFFSET+KERNEL_START_PHYS+0x00000)
+
+/*
+ * 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__ ("lwsync" : : : "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 CONFIG_XMON
+extern void xmon_irq(int, void *, struct pt_regs *);
+extern void xmon(struct pt_regs *excp);
+#endif
+
+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 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 abs(int);
+extern void cacheable_memzero(void *p, unsigned int nb);
+
+struct device_node;
+
+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);
+
+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)
+
+static __inline__ int __is_processor(unsigned long pv)
+{
+      unsigned long pvr;
+      asm volatile("mfspr %0, 0x11F" : "=r" (pvr)); 
+      return(PVR_VER(pvr) == pv);
+}
+
+/*
+ * Atomic exchange
+ *
+ * Changes the memory location '*ptr' to be val and returns
+ * the previous value stored there.
+ *
+ * Inline asm pulled from arch/ppc/kernel/misc.S so ppc64
+ * is more like most of the other architectures.
+ */
+static __inline__ unsigned long
+__xchg_u32(volatile int *m, unsigned long val)
+{
+	unsigned long dummy;
+
+	__asm__ __volatile__(
+	EIEIO_ON_SMP
+"1:	lwarx %0,0,%3		# __xchg_u32\n\
+	stwcx. %2,0,%3\n\
+2:	bne- 1b"
+	ISYNC_ON_SMP
+ 	: "=&r" (dummy), "=m" (*m)
+	: "r" (val), "r" (m)
+	: "cc", "memory");
+
+	return (dummy);
+}
+
+static __inline__ unsigned long
+__xchg_u64(volatile long *m, unsigned long val)
+{
+	unsigned long dummy;
+
+	__asm__ __volatile__(
+	EIEIO_ON_SMP
+"1:	ldarx %0,0,%3		# __xchg_u64\n\
+	stdcx. %2,0,%3\n\
+2:	bne- 1b"
+	ISYNC_ON_SMP
+	: "=&r" (dummy), "=m" (*m)
+	: "r" (val), "r" (m)
+	: "cc", "memory");
+
+	return (dummy);
+}
+
+/*
+ * 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);
+
+static __inline__ unsigned long
+__xchg(volatile void *ptr, unsigned long x, int size)
+{
+	switch (size) {
+	case 4:
+		return __xchg_u32(ptr, x);
+	case 8:
+		return __xchg_u64(ptr, x);
+	}
+	__xchg_called_with_bad_pointer();
+	return x;
+}
+
+#define xchg(ptr,x)							     \
+  ({									     \
+     __typeof__(*(ptr)) _x_ = (x);					     \
+     (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
+  })
+
+#define tas(ptr) (xchg((ptr),1))
+
+#define __HAVE_ARCH_CMPXCHG	1
+
+static __inline__ unsigned long
+__cmpxchg_u32(volatile int *p, int old, int new)
+{
+	int prev;
+
+	__asm__ __volatile__ (
+	EIEIO_ON_SMP
+"1:	lwarx	%0,0,%2		# __cmpxchg_u32\n\
+	cmpw	0,%0,%3\n\
+	bne-	2f\n\
+	stwcx.	%4,0,%2\n\
+	bne-	1b"
+	ISYNC_ON_SMP
+	"\n\
+2:"
+	: "=&r" (prev), "=m" (*p)
+	: "r" (p), "r" (old), "r" (new), "m" (*p)
+	: "cc", "memory");
+
+	return prev;
+}
+
+static __inline__ unsigned long
+__cmpxchg_u64(volatile long *p, unsigned long old, unsigned long new)
+{
+	int prev;
+
+	__asm__ __volatile__ (
+	EIEIO_ON_SMP
+"1:	ldarx	%0,0,%2		# __cmpxchg_u64\n\
+	cmpd	0,%0,%3\n\
+	bne-	2f\n\
+	stdcx.	%4,0,%2\n\
+	bne-	1b"
+	ISYNC_ON_SMP
+	"\n\
+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);
+	case 8:
+		return __cmpxchg_u64(ptr, old, new);
+	}
+	__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