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/*
* include/asm-mips/system.h
*
* 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 by Ralf Baechle
*/
#ifndef _ASM_MIPS_SYSTEM_H_
#define _ASM_MIPS_SYSTEM_H_
#include <asm/segment.h>
#include <mips/mipsregs.h>
/*
* move_to_user_mode() doesn't switch to user mode on the mips, since
* that would run us into problems: The kernel is located at virtual
* address 0x80000000. If we now would switch over to user mode, we
* we would immediately get an address error exception.
* Anyway - we don't have problems with a task running in kernel mode,
* as long it's code is foolproof.
*/
#define move_to_user_mode()
#define sti() \
__asm__ __volatile__( \
"mfc0\t$1,"STR(CP0_STATUS)"\n\t" \
"ori\t$1,$1,1\n\t" \
"mtc0\t$1,"STR(CP0_STATUS)"\n\t" \
: /* no outputs */ \
: /* no inputs */ \
: "$1","memory")
#define cli() \
__asm__ __volatile__( \
"mfc0\t$1,"STR(CP0_STATUS)"\n\t" \
"srl\t$1,$1,1\n\t" \
"sll\t$1,$1,1\n\t" \
"mtc0\t$1,"STR(CP0_STATUS)"\n\t" \
: /* no outputs */ \
: /* no inputs */ \
: "$1","memory")
#define nop() __asm__ __volatile__ ("nop")
#define save_flags(x) \
__asm__ __volatile__( \
".set\tnoreorder\n\t" \
".set\tnoat\n\t" \
"mfc0\t%0,$12\n\t" \
".set\tat\n\t" \
".set\treorder" \
: "=r" (x) \
: /* no inputs */ \
: "memory")
#define restore_flags(x) \
__asm__ __volatile__( \
".set\tnoreorder\n\t" \
".set\tnoat\n\t" \
"mtc0\t%0,$12\n\t" \
".set\tat\n\t" \
".set\treorder" \
: /* no output */ \
: "r" (x) \
: "memory")
#endif /* _ASM_MIPS_SYSTEM_H_ */
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