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[ARM] Feroceon: Feroceon-specific WA-cache compatible {copy,clear}_user_page()
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>
This commit is contained in:
Lennert Buytenhek
Nicolas Pitre
parent
6b29e681aa
commit
0ed1507183
@ -372,7 +372,7 @@ config CPU_FEROCEON
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select CPU_PABRT_NOIFAR
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select CPU_CACHE_VIVT
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select CPU_CP15_MMU
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select CPU_COPY_V4WB if MMU
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select CPU_COPY_FEROCEON if MMU
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select CPU_TLB_V4WBI if MMU
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config CPU_FEROCEON_OLD_ID
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@ -523,6 +523,9 @@ config CPU_COPY_V4WT
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config CPU_COPY_V4WB
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bool
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config CPU_COPY_FEROCEON
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bool
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config CPU_COPY_V6
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bool
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@ -36,6 +36,7 @@ obj-$(CONFIG_CPU_CACHE_V7) += cache-v7.o
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obj-$(CONFIG_CPU_COPY_V3) += copypage-v3.o
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obj-$(CONFIG_CPU_COPY_V4WT) += copypage-v4wt.o
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obj-$(CONFIG_CPU_COPY_V4WB) += copypage-v4wb.o
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obj-$(CONFIG_CPU_COPY_FEROCEON) += copypage-feroceon.o
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obj-$(CONFIG_CPU_COPY_V6) += copypage-v6.o context.o
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obj-$(CONFIG_CPU_SA1100) += copypage-v4mc.o
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obj-$(CONFIG_CPU_XSCALE) += copypage-xscale.o
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95
arch/arm/mm/copypage-feroceon.S
Normal file
95
arch/arm/mm/copypage-feroceon.S
Normal file
@ -0,0 +1,95 @@
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/*
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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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@ -440,7 +440,7 @@ __feroceon_old_id_proc_info:
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.long cpu_feroceon_name
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.long feroceon_processor_functions
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.long v4wbi_tlb_fns
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.long v4wb_user_fns
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.long feroceon_user_fns
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.long feroceon_cache_fns
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.size __feroceon_old_id_proc_info, . - __feroceon_old_id_proc_info
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#endif
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@ -466,6 +466,6 @@ __feroceon_proc_info:
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.long cpu_feroceon_name
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.long feroceon_processor_functions
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.long v4wbi_tlb_fns
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.long v4wb_user_fns
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.long feroceon_user_fns
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.long feroceon_cache_fns
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.size __feroceon_proc_info, . - __feroceon_proc_info
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@ -71,6 +71,14 @@
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# endif
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#endif
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#ifdef CONFIG_CPU_COPY_FEROCEON
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# ifdef _USER
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# define MULTI_USER 1
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# else
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# define _USER feroceon
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# endif
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#endif
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#ifdef CONFIG_CPU_SA1100
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# ifdef _USER
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# define MULTI_USER 1
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