mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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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>
95 lines
2.3 KiB
ArmAsm
95 lines
2.3 KiB
ArmAsm
/*
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* linux/arch/arm/lib/copypage-feroceon.S
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*
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* Copyright (C) 2008 Marvell Semiconductors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This handles copy_user_page and clear_user_page on Feroceon
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* more optimally than the generic implementations.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/asm-offsets.h>
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.text
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.align 5
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ENTRY(feroceon_copy_user_page)
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stmfd sp!, {r4-r9, lr}
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mov ip, #PAGE_SZ
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1: mov lr, r1
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ldmia r1!, {r2 - r9}
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pld [lr, #32]
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pld [lr, #64]
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pld [lr, #96]
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pld [lr, #128]
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pld [lr, #160]
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pld [lr, #192]
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pld [lr, #224]
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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ldmia r1!, {r2 - r9}
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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stmia r0, {r2 - r9}
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subs ip, ip, #(32 * 8)
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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bne 1b
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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ldmfd sp!, {r4-r9, pc}
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.align 5
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ENTRY(feroceon_clear_user_page)
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stmfd sp!, {r4-r7, lr}
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mov r1, #PAGE_SZ/32
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mov r2, #0
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mov r3, #0
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mov r4, #0
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mov r5, #0
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mov r6, #0
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mov r7, #0
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mov ip, #0
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mov lr, #0
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1: stmia r0, {r2-r7, ip, lr}
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subs r1, r1, #1
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
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add r0, r0, #32
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bne 1b
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mcr p15, 0, r1, c7, c10, 4 @ drain WB
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ldmfd sp!, {r4-r7, pc}
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__INITDATA
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.type feroceon_user_fns, #object
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ENTRY(feroceon_user_fns)
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.long feroceon_clear_user_page
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.long feroceon_copy_user_page
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.size feroceon_user_fns, . - feroceon_user_fns
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