98 строки
2.1 KiB
ArmAsm
98 строки
2.1 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/copypage-xsc3.S
|
|
*
|
|
* Copyright (C) 2004 Intel Corp.
|
|
*
|
|
* 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.
|
|
*
|
|
* Adapted for 3rd gen XScale core, no more mini-dcache
|
|
* Author: Matt Gilbert (matthew.m.gilbert@intel.com)
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
/*
|
|
* General note:
|
|
* We don't really want write-allocate cache behaviour for these functions
|
|
* since that will just eat through 8K of the cache.
|
|
*/
|
|
|
|
.text
|
|
.align 5
|
|
/*
|
|
* XSC3 optimised copy_user_page
|
|
* r0 = destination
|
|
* r1 = source
|
|
* r2 = virtual user address of ultimate destination page
|
|
*
|
|
* The source page may have some clean entries in the cache already, but we
|
|
* can safely ignore them - break_cow() will flush them out of the cache
|
|
* if we eventually end up using our copied page.
|
|
*
|
|
*/
|
|
ENTRY(xsc3_mc_copy_user_page)
|
|
stmfd sp!, {r4, r5, lr}
|
|
mov lr, #PAGE_SZ/64-1
|
|
|
|
pld [r1, #0]
|
|
pld [r1, #32]
|
|
1: pld [r1, #64]
|
|
pld [r1, #96]
|
|
|
|
2: ldrd r2, [r1], #8
|
|
mov ip, r0
|
|
ldrd r4, [r1], #8
|
|
mcr p15, 0, ip, c7, c6, 1 @ invalidate
|
|
strd r2, [r0], #8
|
|
ldrd r2, [r1], #8
|
|
strd r4, [r0], #8
|
|
ldrd r4, [r1], #8
|
|
strd r2, [r0], #8
|
|
strd r4, [r0], #8
|
|
ldrd r2, [r1], #8
|
|
mov ip, r0
|
|
ldrd r4, [r1], #8
|
|
mcr p15, 0, ip, c7, c6, 1 @ invalidate
|
|
strd r2, [r0], #8
|
|
ldrd r2, [r1], #8
|
|
subs lr, lr, #1
|
|
strd r4, [r0], #8
|
|
ldrd r4, [r1], #8
|
|
strd r2, [r0], #8
|
|
strd r4, [r0], #8
|
|
bgt 1b
|
|
beq 2b
|
|
|
|
ldmfd sp!, {r4, r5, pc}
|
|
|
|
.align 5
|
|
/*
|
|
* XScale optimised clear_user_page
|
|
* r0 = destination
|
|
* r1 = virtual user address of ultimate destination page
|
|
*/
|
|
ENTRY(xsc3_mc_clear_user_page)
|
|
mov r1, #PAGE_SZ/32
|
|
mov r2, #0
|
|
mov r3, #0
|
|
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line
|
|
strd r2, [r0], #8
|
|
strd r2, [r0], #8
|
|
strd r2, [r0], #8
|
|
strd r2, [r0], #8
|
|
subs r1, r1, #1
|
|
bne 1b
|
|
mov pc, lr
|
|
|
|
__INITDATA
|
|
|
|
.type xsc3_mc_user_fns, #object
|
|
ENTRY(xsc3_mc_user_fns)
|
|
.long xsc3_mc_clear_user_page
|
|
.long xsc3_mc_copy_user_page
|
|
.size xsc3_mc_user_fns, . - xsc3_mc_user_fns
|