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/*
* linux/arch/arm26/lib/io-readsw.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>
#include <asm/hardware.h>
.insw_bad_alignment:
adr r0, .insw_bad_align_msg
mov r2, lr
b panic
.insw_bad_align_msg:
.asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
.align
.insw_align: tst r1, #1
bne .insw_bad_alignment
ldr r3, [r0]
strb r3, [r1], #1
mov r3, r3, lsr #8
strb r3, [r1], #1
subs r2, r2, #1
RETINSTR(moveq, pc, lr)
ENTRY(__raw_readsw)
teq r2, #0 @ do we have to check for the zero len?
moveq pc, lr
tst r1, #3
bne .insw_align
.insw_aligned: mov ip, #0xff
orr ip, ip, ip, lsl #8
stmfd sp!, {r4, r5, r6, lr}
subs r2, r2, #8
bmi .no_insw_8
.insw_8_lp: ldr r3, [r0]
and r3, r3, ip
ldr r4, [r0]
orr r3, r3, r4, lsl #16
ldr r4, [r0]
and r4, r4, ip
ldr r5, [r0]
orr r4, r4, r5, lsl #16
ldr r5, [r0]
and r5, r5, ip
ldr r6, [r0]
orr r5, r5, r6, lsl #16
ldr r6, [r0]
and r6, r6, ip
ldr lr, [r0]
orr r6, r6, lr, lsl #16
stmia r1!, {r3 - r6}
subs r2, r2, #8
bpl .insw_8_lp
tst r2, #7
LOADREGS(eqfd, sp!, {r4, r5, r6, pc})
.no_insw_8: tst r2, #4
beq .no_insw_4
ldr r3, [r0]
and r3, r3, ip
ldr r4, [r0]
orr r3, r3, r4, lsl #16
ldr r4, [r0]
and r4, r4, ip
ldr r5, [r0]
orr r4, r4, r5, lsl #16
stmia r1!, {r3, r4}
.no_insw_4: tst r2, #2
beq .no_insw_2
ldr r3, [r0]
and r3, r3, ip
ldr r4, [r0]
orr r3, r3, r4, lsl #16
str r3, [r1], #4
.no_insw_2: tst r2, #1
ldrne r3, [r0]
strneb r3, [r1], #1
movne r3, r3, lsr #8
strneb r3, [r1]
LOADREGS(fd, sp!, {r4, r5, r6, pc})
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