[people/arne_f/kernel.git] / arch / arm / lib / io-writesb.S

/*
 *  linux/arch/arm/lib/io-writesb.S
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

		.macro	outword, rd
#ifndef __ARMEB__
		strb	\rd, [r0]
		mov	\rd, \rd, lsr #8
		strb	\rd, [r0]
		mov	\rd, \rd, lsr #8
		strb	\rd, [r0]
		mov	\rd, \rd, lsr #8
		strb	\rd, [r0]
#else
		mov	lr, \rd, lsr #24
		strb	lr, [r0]
		mov	lr, \rd, lsr #16
		strb	lr, [r0]
		mov	lr, \rd, lsr #8
		strb	lr, [r0]
		strb	\rd, [r0]
#endif
		.endm

.Loutsb_align:	rsb	ip, ip, #4
		cmp	ip, r2
		movgt	ip, r2
		cmp	ip, #2
		ldrb	r3, [r1], #1
		strb	r3, [r0]
		ldrgeb	r3, [r1], #1
		strgeb	r3, [r0]
		ldrgtb	r3, [r1], #1
		strgtb	r3, [r0]
		subs	r2, r2, ip
		bne	.Loutsb_aligned

ENTRY(__raw_writesb)
		teq	r2, #0		@ do we have to check for the zero len?
		moveq	pc, lr
		ands	ip, r1, #3
		bne	.Loutsb_align

.Loutsb_aligned:
		stmfd	sp!, {r4, r5, lr}

		subs	r2, r2, #16
		bmi	.Loutsb_no_16

.Loutsb_16_lp:	ldmia	r1!, {r3, r4, r5, ip}
		outword	r3
		outword	r4
		outword	r5
		outword	ip
		subs	r2, r2, #16
		bpl	.Loutsb_16_lp

		tst	r2, #15
		ldmeqfd	sp!, {r4, r5, pc}

.Loutsb_no_16:	tst	r2, #8
		beq	.Loutsb_no_8

		ldmia	r1!, {r3, r4}
		outword	r3
		outword	r4

.Loutsb_no_8:	tst	r2, #4
		beq	.Loutsb_no_4

		ldr	r3, [r1], #4
		outword	r3

.Loutsb_no_4:	ands	r2, r2, #3
		ldmeqfd	sp!, {r4, r5, pc}

		cmp	r2, #2
		ldrb	r3, [r1], #1
		strb	r3, [r0]
		ldrgeb	r3, [r1], #1
		strgeb	r3, [r0]
		ldrgtb	r3, [r1]
		strgtb	r3, [r0]

		ldmfd	sp!, {r4, r5, pc}
ENDPROC(__raw_writesb)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/lib/io-writesb.S
	3	*
	4	* Copyright (C) 1995-2000 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#include <linux/linkage.h>
	11	#include <asm/assembler.h>
	12
	13	.macro outword, rd
	14	#ifndef __ARMEB__
	15	strb \rd, [r0]
	16	mov \rd, \rd, lsr #8
	17	strb \rd, [r0]
	18	mov \rd, \rd, lsr #8
	19	strb \rd, [r0]
	20	mov \rd, \rd, lsr #8
	21	strb \rd, [r0]
	22	#else
	23	mov lr, \rd, lsr #24
	24	strb lr, [r0]
	25	mov lr, \rd, lsr #16
	26	strb lr, [r0]
	27	mov lr, \rd, lsr #8
	28	strb lr, [r0]
	29	strb \rd, [r0]
	30	#endif
	31	.endm
	32
a9c4814d	33	.Loutsb_align: rsb ip, ip, #4
1da177e4 LT	34	cmp ip, r2
	35	movgt ip, r2
	36	cmp ip, #2
	37	ldrb r3, [r1], #1
	38	strb r3, [r0]
	39	ldrgeb r3, [r1], #1
	40	strgeb r3, [r0]
	41	ldrgtb r3, [r1], #1
	42	strgtb r3, [r0]
	43	subs r2, r2, ip
a9c4814d	44	bne .Loutsb_aligned
1da177e4 LT	45
	46	ENTRY(__raw_writesb)
	47	teq r2, #0 @ do we have to check for the zero len?
	48	moveq pc, lr
	49	ands ip, r1, #3
a9c4814d	50	bne .Loutsb_align
1da177e4	51
a9c4814d NP	52	.Loutsb_aligned:
a9c4814d NP	53	stmfd sp!, {r4, r5, lr}
1da177e4 LT	54
1da177e4 LT	55	subs r2, r2, #16
a9c4814d	56	bmi .Loutsb_no_16
1da177e4	57
a9c4814d	58	.Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip}
1da177e4 LT	59	outword r3
	60	outword r4
	61	outword r5
	62	outword ip
	63	subs r2, r2, #16
a9c4814d	64	bpl .Loutsb_16_lp
1da177e4 LT	65
1da177e4 LT	66	tst r2, #15
1b93a717	67	ldmeqfd sp!, {r4, r5, pc}
1da177e4	68
a9c4814d NP	69	.Loutsb_no_16: tst r2, #8
a9c4814d NP	70	beq .Loutsb_no_8
1da177e4 LT	71
	72	ldmia r1!, {r3, r4}
	73	outword r3
	74	outword r4
	75
a9c4814d NP	76	.Loutsb_no_8: tst r2, #4
a9c4814d NP	77	beq .Loutsb_no_4
1da177e4 LT	78
	79	ldr r3, [r1], #4
	80	outword r3
	81
a9c4814d	82	.Loutsb_no_4: ands r2, r2, #3
1b93a717	83	ldmeqfd sp!, {r4, r5, pc}
1da177e4 LT	84
	85	cmp r2, #2
	86	ldrb r3, [r1], #1
	87	strb r3, [r0]
	88	ldrgeb r3, [r1], #1
	89	strgeb r3, [r0]
	90	ldrgtb r3, [r1]
	91	strgtb r3, [r0]
	92
1b93a717	93	ldmfd sp!, {r4, r5, pc}
93ed3970	94	ENDPROC(__raw_writesb)