/* | |
* linux/arch/m32r/mm/page.S | |
* | |
* Clear/Copy page with CPU | |
* | |
* Copyright (C) 2004 The Free Software Initiative of Japan | |
* | |
* Written by Niibe Yutaka | |
* | |
* 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. | |
* | |
*/ | |
.text | |
.global copy_page | |
/* | |
* copy_page (to, from) | |
* | |
* PAGE_SIZE = 4096-byte | |
* Cache line = 16-byte | |
* 16 * 256 | |
*/ | |
.align 4 | |
copy_page: | |
ldi r2, #255 | |
ld r3, @r0 /* cache line allocate */ | |
ld r4, @r1+ | |
ld r5, @r1+ | |
ld r6, @r1+ | |
ld r7, @r1+ | |
.fillinsn | |
0: | |
st r4, @r0 | |
st r5, @+r0 | |
st r6, @+r0 | |
st r7, @+r0 | |
ld r4, @r1+ | |
addi r0, #4 | |
ld r5, @r1+ | |
ld r6, @r1+ | |
ld r7, @r1+ | |
ld r3, @r0 /* cache line allocate */ | |
addi r2, #-1 | |
bnez r2, 0b | |
st r4, @r0 | |
st r5, @+r0 | |
st r6, @+r0 | |
st r7, @+r0 | |
jmp r14 | |
.text | |
.global clear_page | |
/* | |
* clear_page (to) | |
* | |
* PAGE_SIZE = 4096-byte | |
* Cache line = 16-byte | |
* 16 * 256 | |
*/ | |
.align 4 | |
clear_page: | |
ldi r2, #255 | |
ldi r4, #0 | |
ld r3, @r0 /* cache line allocate */ | |
.fillinsn | |
0: | |
st r4, @r0 | |
st r4, @+r0 | |
st r4, @+r0 | |
st r4, @+r0 | |
addi r0, #4 | |
ld r3, @r0 /* cache line allocate */ | |
addi r2, #-1 | |
bnez r2, 0b | |
st r4, @r0 | |
st r4, @+r0 | |
st r4, @+r0 | |
st r4, @+r0 | |
jmp r14 |