44 lines
1021 B
ArmAsm
44 lines
1021 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/***************************************************************************
|
|
* Copyright (C) 2010 by Spencer Oliver *
|
|
* spen@spen-soft.co.uk *
|
|
***************************************************************************/
|
|
|
|
.text
|
|
.arm
|
|
.arch armv5t
|
|
|
|
.section .init
|
|
/*
|
|
r0 source address (in)
|
|
r1 target address (in)
|
|
r2 word count (in)
|
|
r3 result (out)
|
|
*/
|
|
|
|
write:
|
|
bic r4, r1, #3 /* word address */
|
|
mov r3, #0x40 /* write command */
|
|
strh r3, [r4, #0]
|
|
ldrh r3, [r0], #2 /* read data */
|
|
strh r3, [r1], #2 /* write data */
|
|
mov r3, #0x70 /* status command */
|
|
strh r3, [r4, #0]
|
|
busy:
|
|
ldrb r3, [r4, #0] /* status */
|
|
tst r3, #0x80
|
|
beq busy
|
|
mov r5, #0x50 /* clear status command */
|
|
strh r5, [r4, #0]
|
|
mov r5, #0xFF /* read array */
|
|
strh r5, [r4, #0]
|
|
tst r3, #0x12
|
|
bne exit
|
|
subs r2, r2, #1 /* decrement word count */
|
|
bne write
|
|
exit:
|
|
bkpt #0
|
|
|
|
.end
|