0ed1507183
This patch implements a set of Feroceon-specific
{copy,clear}_user_page() routines that perform more optimally than
the generic implementations. This also deals with write-allocate
caches (Feroceon can run L1 D in WA mode) which otherwise prevents
Linux from booting.
[nico: optimized the code even further]
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Sylver Bruneau <sylver.bruneau@googlemail.com>
Tested-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
96 lines
2.3 KiB
ArmAsm
96 lines
2.3 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/copypage-feroceon.S
|
|
*
|
|
* Copyright (C) 2008 Marvell Semiconductors
|
|
*
|
|
* 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.
|
|
*
|
|
* This handles copy_user_page and clear_user_page on Feroceon
|
|
* more optimally than the generic implementations.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
.text
|
|
.align 5
|
|
|
|
ENTRY(feroceon_copy_user_page)
|
|
stmfd sp!, {r4-r9, lr}
|
|
mov ip, #PAGE_SZ
|
|
1: mov lr, r1
|
|
ldmia r1!, {r2 - r9}
|
|
pld [lr, #32]
|
|
pld [lr, #64]
|
|
pld [lr, #96]
|
|
pld [lr, #128]
|
|
pld [lr, #160]
|
|
pld [lr, #192]
|
|
pld [lr, #224]
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
ldmia r1!, {r2 - r9}
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
stmia r0, {r2 - r9}
|
|
subs ip, ip, #(32 * 8)
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
bne 1b
|
|
mcr p15, 0, ip, c7, c10, 4 @ drain WB
|
|
ldmfd sp!, {r4-r9, pc}
|
|
|
|
.align 5
|
|
|
|
ENTRY(feroceon_clear_user_page)
|
|
stmfd sp!, {r4-r7, lr}
|
|
mov r1, #PAGE_SZ/32
|
|
mov r2, #0
|
|
mov r3, #0
|
|
mov r4, #0
|
|
mov r5, #0
|
|
mov r6, #0
|
|
mov r7, #0
|
|
mov ip, #0
|
|
mov lr, #0
|
|
1: stmia r0, {r2-r7, ip, lr}
|
|
subs r1, r1, #1
|
|
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
|
|
add r0, r0, #32
|
|
bne 1b
|
|
mcr p15, 0, r1, c7, c10, 4 @ drain WB
|
|
ldmfd sp!, {r4-r7, pc}
|
|
|
|
__INITDATA
|
|
|
|
.type feroceon_user_fns, #object
|
|
ENTRY(feroceon_user_fns)
|
|
.long feroceon_clear_user_page
|
|
.long feroceon_copy_user_page
|
|
.size feroceon_user_fns, . - feroceon_user_fns
|