xref: /openbmc/linux/arch/arm/lib/io-writesl.S (revision 3cf3cdea) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  linux/arch/arm/lib/io-writesl.S
4 *
5 *  Copyright (C) 1995-2000 Russell King
6 */
7#include <linux/linkage.h>
8#include <asm/assembler.h>
9
10ENTRY(__raw_writesl)
11		teq	r2, #0		@ do we have to check for the zero len?
12		reteq	lr
13		ands	ip, r1, #3
14		bne	3f
15
16		subs	r2, r2, #4
17		bmi	2f
18		stmfd	sp!, {r4, lr}
191:		ldmia	r1!, {r3, r4, ip, lr}
20		subs	r2, r2, #4
21		str	r3, [r0, #0]
22		str	r4, [r0, #0]
23		str	ip, [r0, #0]
24		str	lr, [r0, #0]
25		bpl	1b
26		ldmfd	sp!, {r4, lr}
272:		movs	r2, r2, lsl #31
28		ldmiacs	r1!, {r3, ip}
29		strcs	r3, [r0, #0]
30		ldrne	r3, [r1, #0]
31		strcs	ip, [r0, #0]
32		strne	r3, [r0, #0]
33		ret	lr
34
353:		bic	r1, r1, #3
36		ldr	r3, [r1], #4
37		cmp	ip, #2
38		blt	5f
39		bgt	6f
40
414:		mov	ip, r3, lspull #16
42		ldr	r3, [r1], #4
43		subs	r2, r2, #1
44		orr	ip, ip, r3, lspush #16
45		str	ip, [r0]
46		bne	4b
47		ret	lr
48
495:		mov	ip, r3, lspull #8
50		ldr	r3, [r1], #4
51		subs	r2, r2, #1
52		orr	ip, ip, r3, lspush #24
53		str	ip, [r0]
54		bne	5b
55		ret	lr
56
576:		mov	ip, r3, lspull #24
58		ldr	r3, [r1], #4
59		subs	r2, r2, #1
60		orr	ip, ip, r3, lspush #8
61		str	ip, [r0]
62		bne	6b
63		ret	lr
64ENDPROC(__raw_writesl)
65