You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
1.2 KiB
83 lines
1.2 KiB
20 years ago
|
/*
|
||
|
|
* 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
|