/* $Id$
 *
 * 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, 1995, 1996, 1999 Ralf Baechle
 * Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
 * Copyright (C) 1999 Silicon Graphics, Inc.
 */
#ifndef _ASM_STACKFRAME_H
#define _ASM_STACKFRAME_H

#include <asm/asm.h>
#include <asm/offset.h>

#ifdef _LANGUAGE_C

#define __str2(x) #x
#define __str(x) __str2(x)

#define save_static(frame)                               \
	__asm__ __volatile__(                            \
		"sw\t$16,"__str(PT_R16)"(%0)\n\t"        \
		"sw\t$17,"__str(PT_R17)"(%0)\n\t"        \
		"sw\t$18,"__str(PT_R18)"(%0)\n\t"        \
		"sw\t$19,"__str(PT_R19)"(%0)\n\t"        \
		"sw\t$20,"__str(PT_R20)"(%0)\n\t"        \
		"sw\t$21,"__str(PT_R21)"(%0)\n\t"        \
		"sw\t$22,"__str(PT_R22)"(%0)\n\t"        \
		"sw\t$23,"__str(PT_R23)"(%0)\n\t"        \
		"sw\t$30,"__str(PT_R30)"(%0)\n\t"        \
		: /* No outputs */                       \
		: "r" (frame))

#endif /* _LANGUAGE_C */

#ifdef _LANGUAGE_ASSEMBLY

		.macro	SAVE_AT
		sw	$1, PT_R1(sp)
		.endm

		.macro	SAVE_TEMP
		mfhi	v1
		sw	$8, PT_R8(sp)
		sw	$9, PT_R9(sp)
		sw	v1, PT_HI(sp)
		mflo	v1
		sw	$10,PT_R10(sp)
		sw	$11, PT_R11(sp)
		sw	v1,  PT_LO(sp)
		sw	$12, PT_R12(sp)
		sw	$13, PT_R13(sp)
		sw	$14, PT_R14(sp)
		sw	$15, PT_R15(sp)
		sw	$24, PT_R24(sp)
		.endm

		.macro	SAVE_STATIC
		sw	$16, PT_R16(sp)
		sw	$17, PT_R17(sp)
		sw	$18, PT_R18(sp)
		sw	$19, PT_R19(sp)
		sw	$20, PT_R20(sp)
		sw	$21, PT_R21(sp)
		sw	$22, PT_R22(sp)
		sw	$23, PT_R23(sp)
		sw	$30, PT_R30(sp)
		.endm

		.macro	SAVE_SOME
		.set	push
		.set	reorder
		mfc0	k0, CP0_STATUS
		sll	k0, 3		/* extract cu0 bit */
		.set	noreorder
		bltz	k0, 8f
		 move	k1, sp
		.set	reorder
		/* Called from user mode, new stack. */
		lui	k1, %hi(kernelsp)
		lw	k1, %lo(kernelsp)(k1)
8:		move	k0, sp
		subu	sp, k1, PT_SIZE
		sw	k0, PT_R29(sp)
		sw	$3, PT_R3(sp)
		sw	$0, PT_R0(sp)
		mfc0	v1, CP0_STATUS
		sw	$2, PT_R2(sp)
		sw	v1, PT_STATUS(sp)
		sw	$4, PT_R4(sp)
		mfc0	v1, CP0_CAUSE
		sw	$5, PT_R5(sp)
		sw	v1, PT_CAUSE(sp)
		sw	$6, PT_R6(sp)
		mfc0	v1, CP0_EPC
		sw	$7, PT_R7(sp)
		sw	v1, PT_EPC(sp)
		sw	$25, PT_R25(sp)
		sw	$28, PT_R28(sp)
		sw	$31, PT_R31(sp)
		ori	$28, sp, 0x1fff
		xori	$28, 0x1fff
		.set	pop
		.endm

		.macro	SAVE_ALL
		SAVE_SOME
		SAVE_AT
		SAVE_TEMP
		SAVE_STATIC
		.endm

		.macro	RESTORE_AT
		lw	$1,  PT_R1(sp)
		.endm

		.macro	RESTORE_SP
		lw	sp,  PT_R29(sp)
		.endm

		.macro	RESTORE_TEMP
		lw	$24, PT_LO(sp)
		lw	$8, PT_R8(sp)
		lw	$9, PT_R9(sp)
		mtlo	$24
		lw	$24, PT_HI(sp)
		lw	$10,PT_R10(sp)
		lw	$11, PT_R11(sp)
		mthi	$24
		lw	$12, PT_R12(sp)
		lw	$13, PT_R13(sp)
		lw	$14, PT_R14(sp)
		lw	$15, PT_R15(sp)
		lw	$24, PT_R24(sp)
		.endm

		.macro	RESTORE_STATIC
		lw	$16, PT_R16(sp)
		lw	$17, PT_R17(sp)
		lw	$18, PT_R18(sp)
		lw	$19, PT_R19(sp)
		lw	$20, PT_R20(sp)
		lw	$21, PT_R21(sp)
		lw	$22, PT_R22(sp)
		lw	$23, PT_R23(sp)
		lw	$30, PT_R30(sp)
		.endm

		.macro	RESTORE_SOME
		.set	push
		.set	reorder
		mfc0	t0, CP0_STATUS
		.set	pop
		ori	t0, 0x1f
		xori	t0, 0x1f
		mtc0	t0, CP0_STATUS
		li	v1, 0xff00
		and	t0, v1
		lw	v0, PT_STATUS(sp)
		nor	v1, $0, v1
		and	v0, v1
		or	v0, t0
		mtc0	v0, CP0_STATUS
		lw	v1, PT_EPC(sp)
		mtc0	v1, CP0_EPC
		lw	$31, PT_R31(sp)
		lw	$28, PT_R28(sp)
		lw	$25, PT_R25(sp)
		lw	$7,  PT_R7(sp)
		lw	$6,  PT_R6(sp)
		lw	$5,  PT_R5(sp)
		lw	$4,  PT_R4(sp)
		lw	$3,  PT_R3(sp)
		lw	$2,  PT_R2(sp)
		.endm

		.macro	RESTORE_ALL
		RESTORE_SOME
		RESTORE_AT
		RESTORE_TEMP
		RESTORE_STATIC
		RESTORE_SP
		.endm

/*
 * Move to kernel mode and disable interrupts.
 * Set cp0 enable bit as sign that we're running on the kernel stack
 */
		.macro	CLI
		mfc0	t0, CP0_STATUS
		li	t1, ST0_CU0|0x1f
		or	t0, t1
		xori	t0, 0x1f
		mtc0	t0, CP0_STATUS
		.endm

/*
 * Move to kernel mode and enable interrupts.
 * Set cp0 enable bit as sign that we're running on the kernel stack
 */
		.macro	STI
		mfc0	t0,CP0_STATUS
		li	t1,ST0_CU0|0x1f
		or	t0,t1
		xori	t0,0x1e
		mtc0	t0,CP0_STATUS
		.endm

/*
 * Just move to kernel mode and leave interrupts as they are.
 * Set cp0 enable bit as sign that we're running on the kernel stack
 */
		.macro	KMODE
		mfc0	t0, CP0_STATUS
		li	t1, ST0_CU0|0x1e
		or	t0, t1
		xori	t0, 0x1e
		mtc0	t0, CP0_STATUS
		.endm

#endif /* _LANGUAGE_ASSEMBLY */

#endif /* _ASM_STACKFRAME_H */