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/* $Id: system.h,v 1.19 1999/12/04 03:59:12 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 1999 by Ralf Baechle
* Copyright (C) 1996 by Paul M. Antoine
* Copyright (C) 1994 - 1999 by Ralf Baechle
*/
#ifndef _ASM_SYSTEM_H
#define _ASM_SYSTEM_H
#include <linux/config.h>
#include <asm/sgidefs.h>
#include <asm/ptrace.h>
#include <linux/kernel.h>
extern __inline__ void
__sti(void)
{
__asm__ __volatile__(
".set\tpush\n\t"
".set\treorder\n\t"
".set\tnoat\n\t"
"mfc0\t$1,$12\n\t"
"ori\t$1,0x1f\n\t"
"xori\t$1,0x1e\n\t"
"mtc0\t$1,$12\n\t"
".set\tpop\n\t"
: /* no outputs */
: /* no inputs */
: "$1", "memory");
}
/*
* For cli() we have to insert nops to make shure that the new value
* has actually arrived in the status register before the end of this
* macro.
* R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
* no nops at all.
*/
extern __inline__ void
__cli(void)
{
__asm__ __volatile__(
".set\tpush\n\t"
".set\treorder\n\t"
".set\tnoat\n\t"
"mfc0\t$1,$12\n\t"
"ori\t$1,1\n\t"
"xori\t$1,1\n\t"
".set\tnoreorder\n\t"
"mtc0\t$1,$12\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
".set\tpop\n\t"
: /* no outputs */
: /* no inputs */
: "$1", "memory");
}
#define __save_flags(x) \
__asm__ __volatile__( \
".set\tpush\n\t" \
".set\treorder\n\t" \
"mfc0\t%0,$12\n\t" \
".set\tpop\n\t" \
: "=r" (x) \
: /* no inputs */ \
: "memory")
#define __save_and_cli(x) \
__asm__ __volatile__( \
".set\tpush\n\t" \
".set\treorder\n\t" \
".set\tnoat\n\t" \
"mfc0\t%0,$12\n\t" \
"ori\t$1,%0,1\n\t" \
"xori\t$1,1\n\t" \
".set\tnoreorder\n\t" \
"mtc0\t$1,$12\n\t" \
"nop\n\t" \
"nop\n\t" \
"nop\n\t" \
".set\tpop\n\t" \
: "=r" (x) \
: /* no inputs */ \
: "$1", "memory")
extern void __inline__
__restore_flags(int flags)
{
__asm__ __volatile__(
".set\tpush\n\t"
".set\treorder\n\t"
"mfc0\t$8,$12\n\t"
"li\t$9,0xff00\n\t"
"and\t$8,$9\n\t"
"nor\t$9,$0,$9\n\t"
"and\t%0,$9\n\t"
"or\t%0,$8\n\t"
".set\tnoreorder\n\t"
"mtc0\t%0,$12\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
".set\tpop\n\t"
:
: "r" (flags)
: "$8", "$9", "memory");
}
/*
* Non-SMP versions ...
*/
#define sti() __sti()
#define cli() __cli()
#define save_flags(x) __save_flags(x)
#define save_and_cli(x) __save_and_cli(x)
#define restore_flags(x) __restore_flags(x)
/* For spinlocks etc */
#define local_irq_save(x) __save_and_cli(x);
#define local_irq_restore(x) __restore_flags(x);
#define local_irq_disable() __cli();
#define local_irq_enable() __sti();
/*
* These are probably defined overly paranoid ...
*/
#ifdef CONFIG_CPU_HAS_WB
#include <asm/wbflush.h>
#define rmb()
#define wmb() wbflush()
#define mb() wbflush()
#else
#define mb() \
__asm__ __volatile__( \
"# prevent instructions being moved around\n\t" \
".set\tnoreorder\n\t" \
"# 8 nops to fool the R4400 pipeline\n\t" \
"nop;nop;nop;nop;nop;nop;nop;nop\n\t" \
".set\treorder" \
: /* no output */ \
: /* no input */ \
: "memory")
#define rmb() mb()
#define wmb() mb()
#endif
#define set_mb(var, value) \
do { var = value; mb(); } while (0)
#define set_rmb(var, value) \
do { var = value; rmb(); } while (0)
#define set_wmb(var, value) \
do { var = value; wmb(); } while (0)
#if !defined (_LANGUAGE_ASSEMBLY)
/*
* switch_to(n) should switch tasks to task nr n, first
* checking that n isn't the current task, in which case it does nothing.
*/
extern asmlinkage void *resume(void *last, void *next);
#endif /* !defined (_LANGUAGE_ASSEMBLY) */
#define prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) \
do { \
(last) = resume(prev, next); \
} while(0)
/*
* For 32 and 64 bit operands we can take advantage of ll and sc.
* FIXME: This doesn't work for R3000 machines.
*/
extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
{
#if defined(CONFIG_CPU_HAS_LLSC)
unsigned long dummy;
__asm__ __volatile__(
".set\tnoreorder\n\t"
".set\tnoat\n\t"
"ll\t%0,(%1)\n"
"1:\tmove\t$1,%2\n\t"
"sc\t$1,(%1)\n\t"
"beqzl\t$1,1b\n\t"
"ll\t%0,(%1)\n\t"
".set\tat\n\t"
".set\treorder"
: "=r" (val), "=r" (m), "=r" (dummy)
: "1" (m), "2" (val)
: "memory");
return val;
#else
unsigned long flags, retval;
save_flags(flags);
cli();
retval = *m;
*m = val;
restore_flags(flags);
return retval;
#endif /* Processor-dependent optimization */
}
/*
* Only used for 64 bit kernel.
*/
extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val)
{
unsigned long dummy;
__asm__ __volatile__(
".set\tnoreorder\n\t"
".set\tnoat\n\t"
"lld\t%0,(%1)\n"
"1:\tmove\t$1,%2\n\t"
"scd\t$1,(%1)\n\t"
"beqzl\t$1,1b\n\t"
"lld\t%0,(%1)\n\t"
".set\tat\n\t"
".set\treorder"
: "=r" (val), "=r" (m), "=r" (dummy)
: "1" (m), "2" (val)
: "memory");
return val;
}
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
#define tas(ptr) (xchg((ptr),1))
/*
* 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 I define that one to
* be dead anyway.
*/
extern void __xchg_called_with_bad_pointer(void);
static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
{
switch (size) {
case 4:
return xchg_u32(ptr, x);
#if defined(__mips64)
case 8:
return xchg_u64(ptr, x);
#endif
}
__xchg_called_with_bad_pointer();
return x;
}
extern void set_except_vector(int n, void *addr);
extern void __die(const char *, struct pt_regs *, const char *where,
unsigned long line) __attribute__((noreturn));
extern void __die_if_kernel(const char *, struct pt_regs *, const char *where,
unsigned long line);
#define die(msg, regs) \
__die(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
#define die_if_kernel(msg, regs) do { \
__die_if_kernel(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
#endif /* _ASM_SYSTEM_H */
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