arch/arm/mm/cache-v7.S - kernel/msm-4.19 - Gitiles

 /*
  *  linux/arch/arm/mm/cache-v7.S
  *
  *  Copyright (C) 2001 Deep Blue Solutions Ltd.
  *  Copyright (C) 2005 ARM Ltd.
  *
  * 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 is the "shell" of the ARMv7 processor support.
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
 #include <asm/errno.h>
 #include <asm/unwind.h>

 #include "proc-macros.S"

 /*
  * The secondary kernel init calls v7_flush_dcache_all before it enables
  * the L1; however, the L1 comes out of reset in an undefined state, so
  * the clean + invalidate performed by v7_flush_dcache_all causes a bunch
  * of cache lines with uninitialized data and uninitialized tags to get
  * written out to memory, which does really unpleasant things to the main
  * processor.  We fix this by performing an invalidate, rather than a
  * clean + invalidate, before jumping into the kernel.
  *
  * This function is cloned from arch/arm/mach-tegra/headsmp.S, and needs
  * to be called for both secondary cores startup and primary core resume
  * procedures.
  */
 ENTRY(v7_invalidate_l1)
        mov     r0, #0
        mcr     p15, 2, r0, c0, c0, 0
        mrc     p15, 1, r0, c0, c0, 0

        ldr     r1, =0x7fff
        and     r2, r1, r0, lsr #13

        ldr     r1, =0x3ff

        and     r3, r1, r0, lsr #3      @ NumWays - 1
        add     r2, r2, #1              @ NumSets

        and     r0, r0, #0x7
        add     r0, r0, #4      @ SetShift

        clz     r1, r3          @ WayShift
        add     r4, r3, #1      @ NumWays
 1:     sub     r2, r2, #1      @ NumSets--
        mov     r3, r4          @ Temp = NumWays
 2:     subs    r3, r3, #1      @ Temp--
        mov     r5, r3, lsl r1
        mov     r6, r2, lsl r0
        orr     r5, r5, r6      @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
        mcr     p15, 0, r5, c7, c6, 2
        bgt     2b
        cmp     r2, #0
        bgt     1b
        dsb     st
        isb
        ret     lr
 ENDPROC(v7_invalidate_l1)

 /*
  *	v7_flush_icache_all()
  *
  *	Flush the whole I-cache.
  *
  *	Registers:
  *	r0 - set to 0
  */
 ENTRY(v7_flush_icache_all)
 	mov	r0, #0
 	ALT_SMP(mcr	p15, 0, r0, c7, c1, 0)		@ invalidate I-cache inner shareable
 	ALT_UP(mcr	p15, 0, r0, c7, c5, 0)		@ I+BTB cache invalidate
 	ret	lr
 ENDPROC(v7_flush_icache_all)

  /*
  *     v7_flush_dcache_louis()
  *
  *     Flush the D-cache up to the Level of Unification Inner Shareable
  *
  *     Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
  */

 ENTRY(v7_flush_dcache_louis)
 	dmb					@ ensure ordering with previous memory accesses
 	mrc	p15, 1, r0, c0, c0, 1		@ read clidr, r0 = clidr
 	ALT_SMP(ands	r3, r0, #(7 << 21))	@ extract LoUIS from clidr
 	ALT_UP(ands	r3, r0, #(7 << 27))	@ extract LoUU from clidr
 #ifdef CONFIG_ARM_ERRATA_643719
 	ALT_SMP(mrceq	p15, 0, r2, c0, c0, 0)	@ read main ID register
 	ALT_UP(reteq	lr)			@ LoUU is zero, so nothing to do
 	ldreq	r1, =0x410fc090                 @ ID of ARM Cortex A9 r0p?
 	biceq	r2, r2, #0x0000000f             @ clear minor revision number
 	teqeq	r2, r1                          @ test for errata affected core and if so...
 	orreqs	r3, #(1 << 21)			@   fix LoUIS value (and set flags state to 'ne')
 #endif
 	ALT_SMP(mov	r3, r3, lsr #20)	@ r3 = LoUIS * 2
 	ALT_UP(mov	r3, r3, lsr #26)	@ r3 = LoUU * 2
 	reteq	lr				@ return if level == 0
 	mov	r10, #0				@ r10 (starting level) = 0
 	b	flush_levels			@ start flushing cache levels
 ENDPROC(v7_flush_dcache_louis)

 /*
  *	v7_flush_dcache_all()
  *
  *	Flush the whole D-cache.
  *
  *	Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
  *
  *	- mm    - mm_struct describing address space
  */
 ENTRY(v7_flush_dcache_all)
 	dmb					@ ensure ordering with previous memory accesses
 	mrc	p15, 1, r0, c0, c0, 1		@ read clidr
 	ands	r3, r0, #0x7000000		@ extract loc from clidr
 	mov	r3, r3, lsr #23			@ left align loc bit field
 	beq	finished			@ if loc is 0, then no need to clean
 	mov	r10, #0				@ start clean at cache level 0
 flush_levels:
 	add	r2, r10, r10, lsr #1		@ work out 3x current cache level
 	mov	r1, r0, lsr r2			@ extract cache type bits from clidr
 	and	r1, r1, #7			@ mask of the bits for current cache only
 	cmp	r1, #2				@ see what cache we have at this level
 	blt	skip				@ skip if no cache, or just i-cache
 #ifdef CONFIG_PREEMPT
 	save_and_disable_irqs_notrace r9	@ make cssr&csidr read atomic
 #endif
 	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
 	isb					@ isb to sych the new cssr&csidr
 	mrc	p15, 1, r1, c0, c0, 0		@ read the new csidr
 #ifdef CONFIG_PREEMPT
 	restore_irqs_notrace r9
 #endif
 	and	r2, r1, #7			@ extract the length of the cache lines
 	add	r2, r2, #4			@ add 4 (line length offset)
 	ldr	r4, =0x3ff
 	ands	r4, r4, r1, lsr #3		@ find maximum number on the way size
 	clz	r5, r4				@ find bit position of way size increment
 	ldr	r7, =0x7fff
 	ands	r7, r7, r1, lsr #13		@ extract max number of the index size
 loop1:
 	mov	r9, r7				@ create working copy of max index
 loop2:
  ARM(	orr	r11, r10, r4, lsl r5	)	@ factor way and cache number into r11
  THUMB(	lsl	r6, r4, r5		)
  THUMB(	orr	r11, r10, r6		)	@ factor way and cache number into r11
  ARM(	orr	r11, r11, r9, lsl r2	)	@ factor index number into r11
  THUMB(	lsl	r6, r9, r2		)
  THUMB(	orr	r11, r11, r6		)	@ factor index number into r11
 	mcr	p15, 0, r11, c7, c14, 2		@ clean & invalidate by set/way
 	subs	r9, r9, #1			@ decrement the index
 	bge	loop2
 	subs	r4, r4, #1			@ decrement the way
 	bge	loop1
 skip:
 	add	r10, r10, #2			@ increment cache number
 	cmp	r3, r10
 	bgt	flush_levels
 finished:
 	mov	r10, #0				@ swith back to cache level 0
 	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
 	dsb	st
 	isb
 	ret	lr
 ENDPROC(v7_flush_dcache_all)

 /*
  *	v7_flush_cache_all()
  *
  *	Flush the entire cache system.
  *  The data cache flush is now achieved using atomic clean / invalidates
  *  working outwards from L1 cache. This is done using Set/Way based cache
  *  maintenance instructions.
  *  The instruction cache can still be invalidated back to the point of
  *  unification in a single instruction.
  *
  */
 ENTRY(v7_flush_kern_cache_all)
  ARM(	stmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
  THUMB(	stmfd	sp!, {r4-r7, r9-r11, lr}	)
 	bl	v7_flush_dcache_all
 	mov	r0, #0
 	ALT_SMP(mcr	p15, 0, r0, c7, c1, 0)	@ invalidate I-cache inner shareable
 	ALT_UP(mcr	p15, 0, r0, c7, c5, 0)	@ I+BTB cache invalidate
  ARM(	ldmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
  THUMB(	ldmfd	sp!, {r4-r7, r9-r11, lr}	)
 	ret	lr
 ENDPROC(v7_flush_kern_cache_all)

  /*
  *     v7_flush_kern_cache_louis(void)
  *
  *     Flush the data cache up to Level of Unification Inner Shareable.
  *     Invalidate the I-cache to the point of unification.
  */
 ENTRY(v7_flush_kern_cache_louis)
  ARM(	stmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
  THUMB(	stmfd	sp!, {r4-r7, r9-r11, lr}	)
 	bl	v7_flush_dcache_louis
 	mov	r0, #0
 	ALT_SMP(mcr	p15, 0, r0, c7, c1, 0)	@ invalidate I-cache inner shareable
 	ALT_UP(mcr	p15, 0, r0, c7, c5, 0)	@ I+BTB cache invalidate
  ARM(	ldmfd	sp!, {r4-r5, r7, r9-r11, lr}	)
  THUMB(	ldmfd	sp!, {r4-r7, r9-r11, lr}	)
 	ret	lr
 ENDPROC(v7_flush_kern_cache_louis)

 /*
  *	v7_flush_cache_all()
  *
  *	Flush all TLB entries in a particular address space
  *
  *	- mm    - mm_struct describing address space
  */
 ENTRY(v7_flush_user_cache_all)
 	/*FALLTHROUGH*/

 /*
  *	v7_flush_cache_range(start, end, flags)
  *
  *	Flush a range of TLB entries in the specified address space.
  *
  *	- start - start address (may not be aligned)
  *	- end   - end address (exclusive, may not be aligned)
  *	- flags	- vm_area_struct flags describing address space
  *
  *	It is assumed that:
  *	- we have a VIPT cache.
  */
 ENTRY(v7_flush_user_cache_range)
 	ret	lr
 ENDPROC(v7_flush_user_cache_all)
 ENDPROC(v7_flush_user_cache_range)

 /*
  *	v7_coherent_kern_range(start,end)
  *
  *	Ensure that the I and D caches are coherent within specified
  *	region.  This is typically used when code has been written to
  *	a memory region, and will be executed.
  *
  *	- start   - virtual start address of region
  *	- end     - virtual end address of region
  *
  *	It is assumed that:
  *	- the Icache does not read data from the write buffer
  */
 ENTRY(v7_coherent_kern_range)
 	/* FALLTHROUGH */

 /*
  *	v7_coherent_user_range(start,end)
  *
  *	Ensure that the I and D caches are coherent within specified
  *	region.  This is typically used when code has been written to
  *	a memory region, and will be executed.
  *
  *	- start   - virtual start address of region
  *	- end     - virtual end address of region
  *
  *	It is assumed that:
  *	- the Icache does not read data from the write buffer
  */
 ENTRY(v7_coherent_user_range)
  UNWIND(.fnstart		)
 	dcache_line_size r2, r3
 	sub	r3, r2, #1
 	bic	r12, r0, r3
 #ifdef CONFIG_ARM_ERRATA_764369
 	ALT_SMP(W(dsb))
 	ALT_UP(W(nop))
 #endif
 1:
  USER(	mcr	p15, 0, r12, c7, c11, 1	)	@ clean D line to the point of unification
 	add	r12, r12, r2
 	cmp	r12, r1
 	blo	1b
 	dsb	ishst
 	icache_line_size r2, r3
 	sub	r3, r2, #1
 	bic	r12, r0, r3
 2:
  USER(	mcr	p15, 0, r12, c7, c5, 1	)	@ invalidate I line
 	add	r12, r12, r2
 	cmp	r12, r1
 	blo	2b
 	mov	r0, #0
 	ALT_SMP(mcr	p15, 0, r0, c7, c1, 6)	@ invalidate BTB Inner Shareable
 	ALT_UP(mcr	p15, 0, r0, c7, c5, 6)	@ invalidate BTB
 	dsb	ishst
 	isb
 	ret	lr

 /*
  * Fault handling for the cache operation above. If the virtual address in r0
  * isn't mapped, fail with -EFAULT.
  */
 9001:
 #ifdef CONFIG_ARM_ERRATA_775420
 	dsb
 #endif
 	mov	r0, #-EFAULT
 	ret	lr
  UNWIND(.fnend		)
 ENDPROC(v7_coherent_kern_range)
 ENDPROC(v7_coherent_user_range)

 /*
  *	v7_flush_kern_dcache_area(void *addr, size_t size)
  *
  *	Ensure that the data held in the page kaddr is written back
  *	to the page in question.
  *
  *	- addr	- kernel address
  *	- size	- region size
  */
 ENTRY(v7_flush_kern_dcache_area)
 	dcache_line_size r2, r3
 	add	r1, r0, r1
 	sub	r3, r2, #1
 	bic	r0, r0, r3
 #ifdef CONFIG_ARM_ERRATA_764369
 	ALT_SMP(W(dsb))
 	ALT_UP(W(nop))
 #endif
 1:
 	mcr	p15, 0, r0, c7, c14, 1		@ clean & invalidate D line / unified line
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
 	dsb	st
 	ret	lr
 ENDPROC(v7_flush_kern_dcache_area)

 /*
  *	v7_dma_inv_range(start,end)
  *
  *	Invalidate the data cache within the specified region; we will
  *	be performing a DMA operation in this region and we want to
  *	purge old data in the cache.
  *
  *	- start   - virtual start address of region
  *	- end     - virtual end address of region
  */
 v7_dma_inv_range:
 	dcache_line_size r2, r3
 	sub	r3, r2, #1
 	tst	r0, r3
 	bic	r0, r0, r3
 #ifdef CONFIG_ARM_ERRATA_764369
 	ALT_SMP(W(dsb))
 	ALT_UP(W(nop))
 #endif
 	mcrne	p15, 0, r0, c7, c14, 1		@ clean & invalidate D / U line

 	tst	r1, r3
 	bic	r1, r1, r3
 	mcrne	p15, 0, r1, c7, c14, 1		@ clean & invalidate D / U line
 1:
 	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D / U line
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
 	dsb	st
 	ret	lr
 ENDPROC(v7_dma_inv_range)

 /*
  *	v7_dma_clean_range(start,end)
  *	- start   - virtual start address of region
  *	- end     - virtual end address of region
  */
 v7_dma_clean_range:
 	dcache_line_size r2, r3
 	sub	r3, r2, #1
 	bic	r0, r0, r3
 #ifdef CONFIG_ARM_ERRATA_764369
 	ALT_SMP(W(dsb))
 	ALT_UP(W(nop))
 #endif
 1:
 	mcr	p15, 0, r0, c7, c10, 1		@ clean D / U line
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
 	dsb	st
 	ret	lr
 ENDPROC(v7_dma_clean_range)

 /*
  *	v7_dma_flush_range(start,end)
  *	- start   - virtual start address of region
  *	- end     - virtual end address of region
  */
 ENTRY(v7_dma_flush_range)
 	dcache_line_size r2, r3
 	sub	r3, r2, #1
 	bic	r0, r0, r3
 #ifdef CONFIG_ARM_ERRATA_764369
 	ALT_SMP(W(dsb))
 	ALT_UP(W(nop))
 #endif
 1:
 	mcr	p15, 0, r0, c7, c14, 1		@ clean & invalidate D / U line
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
 	dsb	st
 	ret	lr
 ENDPROC(v7_dma_flush_range)

 /*
  *	dma_map_area(start, size, dir)
  *	- start	- kernel virtual start address
  *	- size	- size of region
  *	- dir	- DMA direction
  */
 ENTRY(v7_dma_map_area)
 	add	r1, r1, r0
 	teq	r2, #DMA_FROM_DEVICE
 	beq	v7_dma_inv_range
 	b	v7_dma_clean_range
 ENDPROC(v7_dma_map_area)

 /*
  *	dma_unmap_area(start, size, dir)
  *	- start	- kernel virtual start address
  *	- size	- size of region
  *	- dir	- DMA direction
  */
 ENTRY(v7_dma_unmap_area)
 	add	r1, r1, r0
 	teq	r2, #DMA_TO_DEVICE
 	bne	v7_dma_inv_range
 	ret	lr
 ENDPROC(v7_dma_unmap_area)

 	__INITDATA

 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 	define_cache_functions v7
	/*
	* linux/arch/arm/mm/cache-v7.S
	*
	* Copyright (C) 2001 Deep Blue Solutions Ltd.
	* Copyright (C) 2005 ARM Ltd.
	*
	* 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 is the "shell" of the ARMv7 processor support.
	*/
	#include <linux/linkage.h>
	#include <linux/init.h>
	#include <asm/assembler.h>
	#include <asm/errno.h>
	#include <asm/unwind.h>

	#include "proc-macros.S"

	/*
	* The secondary kernel init calls v7_flush_dcache_all before it enables
	* the L1; however, the L1 comes out of reset in an undefined state, so
	* the clean + invalidate performed by v7_flush_dcache_all causes a bunch
	* of cache lines with uninitialized data and uninitialized tags to get
	* written out to memory, which does really unpleasant things to the main
	* processor. We fix this by performing an invalidate, rather than a
	* clean + invalidate, before jumping into the kernel.
	*
	* This function is cloned from arch/arm/mach-tegra/headsmp.S, and needs
	* to be called for both secondary cores startup and primary core resume
	* procedures.
	*/
	ENTRY(v7_invalidate_l1)
	mov r0, #0
	mcr p15, 2, r0, c0, c0, 0
	mrc p15, 1, r0, c0, c0, 0

	ldr r1, =0x7fff
	and r2, r1, r0, lsr #13

	ldr r1, =0x3ff

	and r3, r1, r0, lsr #3 @ NumWays - 1
	add r2, r2, #1 @ NumSets

	and r0, r0, #0x7
	add r0, r0, #4 @ SetShift

	clz r1, r3 @ WayShift
	add r4, r3, #1 @ NumWays
	1: sub r2, r2, #1 @ NumSets--
	mov r3, r4 @ Temp = NumWays
	2: subs r3, r3, #1 @ Temp--
	mov r5, r3, lsl r1
	mov r6, r2, lsl r0
	orr r5, r5, r6 @ Reg = (Temp<<WayShift)\|(NumSets<<SetShift)
	mcr p15, 0, r5, c7, c6, 2
	bgt 2b
	cmp r2, #0
	bgt 1b
	dsb st
	isb
	ret lr
	ENDPROC(v7_invalidate_l1)

	/*
	* v7_flush_icache_all()
	*
	* Flush the whole I-cache.
	*
	* Registers:
	* r0 - set to 0
	*/
	ENTRY(v7_flush_icache_all)
	mov r0, #0
	ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
	ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
	ret lr
	ENDPROC(v7_flush_icache_all)

	/*
	* v7_flush_dcache_louis()
	*
	* Flush the D-cache up to the Level of Unification Inner Shareable
	*
	* Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
	*/

	ENTRY(v7_flush_dcache_louis)
	dmb @ ensure ordering with previous memory accesses
	mrc p15, 1, r0, c0, c0, 1 @ read clidr, r0 = clidr
	ALT_SMP(ands r3, r0, #(7 << 21)) @ extract LoUIS from clidr
	ALT_UP(ands r3, r0, #(7 << 27)) @ extract LoUU from clidr
	#ifdef CONFIG_ARM_ERRATA_643719
	ALT_SMP(mrceq p15, 0, r2, c0, c0, 0) @ read main ID register
	ALT_UP(reteq lr) @ LoUU is zero, so nothing to do
	ldreq r1, =0x410fc090 @ ID of ARM Cortex A9 r0p?
	biceq r2, r2, #0x0000000f @ clear minor revision number
	teqeq r2, r1 @ test for errata affected core and if so...
	orreqs r3, #(1 << 21) @ fix LoUIS value (and set flags state to 'ne')
	#endif
	ALT_SMP(mov r3, r3, lsr #20) @ r3 = LoUIS * 2
	ALT_UP(mov r3, r3, lsr #26) @ r3 = LoUU * 2
	reteq lr @ return if level == 0
	mov r10, #0 @ r10 (starting level) = 0
	b flush_levels @ start flushing cache levels
	ENDPROC(v7_flush_dcache_louis)

	/*
	* v7_flush_dcache_all()
	*
	* Flush the whole D-cache.
	*
	* Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
	*
	* - mm - mm_struct describing address space
	*/
	ENTRY(v7_flush_dcache_all)
	dmb @ ensure ordering with previous memory accesses
	mrc p15, 1, r0, c0, c0, 1 @ read clidr
	ands r3, r0, #0x7000000 @ extract loc from clidr
	mov r3, r3, lsr #23 @ left align loc bit field
	beq finished @ if loc is 0, then no need to clean
	mov r10, #0 @ start clean at cache level 0
	flush_levels:
	add r2, r10, r10, lsr #1 @ work out 3x current cache level
	mov r1, r0, lsr r2 @ extract cache type bits from clidr
	and r1, r1, #7 @ mask of the bits for current cache only
	cmp r1, #2 @ see what cache we have at this level
	blt skip @ skip if no cache, or just i-cache
	#ifdef CONFIG_PREEMPT
	save_and_disable_irqs_notrace r9 @ make cssr&csidr read atomic
	#endif
	mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
	isb @ isb to sych the new cssr&csidr
	mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
	#ifdef CONFIG_PREEMPT
	restore_irqs_notrace r9
	#endif
	and r2, r1, #7 @ extract the length of the cache lines
	add r2, r2, #4 @ add 4 (line length offset)
	ldr r4, =0x3ff
	ands r4, r4, r1, lsr #3 @ find maximum number on the way size
	clz r5, r4 @ find bit position of way size increment
	ldr r7, =0x7fff
	ands r7, r7, r1, lsr #13 @ extract max number of the index size
	loop1:
	mov r9, r7 @ create working copy of max index
	loop2:
	ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11
	THUMB( lsl r6, r4, r5 )
	THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
	ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11
	THUMB( lsl r6, r9, r2 )
	THUMB( orr r11, r11, r6 ) @ factor index number into r11
	mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
	subs r9, r9, #1 @ decrement the index
	bge loop2
	subs r4, r4, #1 @ decrement the way
	bge loop1
	skip:
	add r10, r10, #2 @ increment cache number
	cmp r3, r10
	bgt flush_levels
	finished:
	mov r10, #0 @ swith back to cache level 0
	mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
	dsb st
	isb
	ret lr
	ENDPROC(v7_flush_dcache_all)

	/*
	* v7_flush_cache_all()
	*
	* Flush the entire cache system.
	* The data cache flush is now achieved using atomic clean / invalidates
	* working outwards from L1 cache. This is done using Set/Way based cache
	* maintenance instructions.
	* The instruction cache can still be invalidated back to the point of
	* unification in a single instruction.
	*
	*/
	ENTRY(v7_flush_kern_cache_all)
	ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
	THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
	bl v7_flush_dcache_all
	mov r0, #0
	ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
	ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
	ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
	THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
	ret lr
	ENDPROC(v7_flush_kern_cache_all)

	/*
	* v7_flush_kern_cache_louis(void)
	*
	* Flush the data cache up to Level of Unification Inner Shareable.
	* Invalidate the I-cache to the point of unification.
	*/
	ENTRY(v7_flush_kern_cache_louis)
	ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
	THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
	bl v7_flush_dcache_louis
	mov r0, #0
	ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
	ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
	ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
	THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
	ret lr
	ENDPROC(v7_flush_kern_cache_louis)

	/*
	* v7_flush_cache_all()
	*
	* Flush all TLB entries in a particular address space
	*
	* - mm - mm_struct describing address space
	*/
	ENTRY(v7_flush_user_cache_all)
	/FALLTHROUGH/

	/*
	* v7_flush_cache_range(start, end, flags)
	*
	* Flush a range of TLB entries in the specified address space.
	*
	* - start - start address (may not be aligned)
	* - end - end address (exclusive, may not be aligned)
	* - flags - vm_area_struct flags describing address space
	*
	* It is assumed that:
	* - we have a VIPT cache.
	*/
	ENTRY(v7_flush_user_cache_range)
	ret lr
	ENDPROC(v7_flush_user_cache_all)
	ENDPROC(v7_flush_user_cache_range)

	/*
	* v7_coherent_kern_range(start,end)
	*
	* Ensure that the I and D caches are coherent within specified
	* region. This is typically used when code has been written to
	* a memory region, and will be executed.
	*
	* - start - virtual start address of region
	* - end - virtual end address of region
	*
	* It is assumed that:
	* - the Icache does not read data from the write buffer
	*/
	ENTRY(v7_coherent_kern_range)
	/* FALLTHROUGH */

	/*
	* v7_coherent_user_range(start,end)
	*
	* Ensure that the I and D caches are coherent within specified
	* region. This is typically used when code has been written to
	* a memory region, and will be executed.
	*
	* - start - virtual start address of region
	* - end - virtual end address of region
	*
	* It is assumed that:
	* - the Icache does not read data from the write buffer
	*/
	ENTRY(v7_coherent_user_range)
	UNWIND(.fnstart )
	dcache_line_size r2, r3
	sub r3, r2, #1
	bic r12, r0, r3
	#ifdef CONFIG_ARM_ERRATA_764369
	ALT_SMP(W(dsb))
	ALT_UP(W(nop))
	#endif
	1:
	USER( mcr p15, 0, r12, c7, c11, 1 ) @ clean D line to the point of unification
	add r12, r12, r2
	cmp r12, r1
	blo 1b
	dsb ishst
	icache_line_size r2, r3
	sub r3, r2, #1
	bic r12, r0, r3
	2:
	USER( mcr p15, 0, r12, c7, c5, 1 ) @ invalidate I line
	add r12, r12, r2
	cmp r12, r1
	blo 2b
	mov r0, #0
	ALT_SMP(mcr p15, 0, r0, c7, c1, 6) @ invalidate BTB Inner Shareable
	ALT_UP(mcr p15, 0, r0, c7, c5, 6) @ invalidate BTB
	dsb ishst
	isb
	ret lr

	/*
	* Fault handling for the cache operation above. If the virtual address in r0
	* isn't mapped, fail with -EFAULT.
	*/
	9001:
	#ifdef CONFIG_ARM_ERRATA_775420
	dsb
	#endif
	mov r0, #-EFAULT
	ret lr
	UNWIND(.fnend )
	ENDPROC(v7_coherent_kern_range)
	ENDPROC(v7_coherent_user_range)

	/*
	* v7_flush_kern_dcache_area(void *addr, size_t size)
	*
	* Ensure that the data held in the page kaddr is written back
	* to the page in question.
	*
	* - addr - kernel address
	* - size - region size
	*/
	ENTRY(v7_flush_kern_dcache_area)
	dcache_line_size r2, r3
	add r1, r0, r1
	sub r3, r2, #1
	bic r0, r0, r3
	#ifdef CONFIG_ARM_ERRATA_764369
	ALT_SMP(W(dsb))
	ALT_UP(W(nop))
	#endif
	1:
	mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line
	add r0, r0, r2
	cmp r0, r1
	blo 1b
	dsb st
	ret lr
	ENDPROC(v7_flush_kern_dcache_area)

	/*
	* v7_dma_inv_range(start,end)
	*
	* Invalidate the data cache within the specified region; we will
	* be performing a DMA operation in this region and we want to
	* purge old data in the cache.
	*
	* - start - virtual start address of region
	* - end - virtual end address of region
	*/
	v7_dma_inv_range:
	dcache_line_size r2, r3
	sub r3, r2, #1
	tst r0, r3
	bic r0, r0, r3
	#ifdef CONFIG_ARM_ERRATA_764369
	ALT_SMP(W(dsb))
	ALT_UP(W(nop))
	#endif
	mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line

	tst r1, r3
	bic r1, r1, r3
	mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
	1:
	mcr p15, 0, r0, c7, c6, 1 @ invalidate D / U line
	add r0, r0, r2
	cmp r0, r1
	blo 1b
	dsb st
	ret lr
	ENDPROC(v7_dma_inv_range)

	/*
	* v7_dma_clean_range(start,end)
	* - start - virtual start address of region
	* - end - virtual end address of region
	*/
	v7_dma_clean_range:
	dcache_line_size r2, r3
	sub r3, r2, #1
	bic r0, r0, r3
	#ifdef CONFIG_ARM_ERRATA_764369
	ALT_SMP(W(dsb))
	ALT_UP(W(nop))
	#endif
	1:
	mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
	add r0, r0, r2
	cmp r0, r1
	blo 1b
	dsb st
	ret lr
	ENDPROC(v7_dma_clean_range)

	/*
	* v7_dma_flush_range(start,end)
	* - start - virtual start address of region
	* - end - virtual end address of region
	*/
	ENTRY(v7_dma_flush_range)
	dcache_line_size r2, r3
	sub r3, r2, #1
	bic r0, r0, r3
	#ifdef CONFIG_ARM_ERRATA_764369
	ALT_SMP(W(dsb))
	ALT_UP(W(nop))
	#endif
	1:
	mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
	add r0, r0, r2
	cmp r0, r1
	blo 1b
	dsb st
	ret lr
	ENDPROC(v7_dma_flush_range)

	/*
	* dma_map_area(start, size, dir)
	* - start - kernel virtual start address
	* - size - size of region
	* - dir - DMA direction
	*/
	ENTRY(v7_dma_map_area)
	add r1, r1, r0
	teq r2, #DMA_FROM_DEVICE
	beq v7_dma_inv_range
	b v7_dma_clean_range
	ENDPROC(v7_dma_map_area)

	/*
	* dma_unmap_area(start, size, dir)
	* - start - kernel virtual start address
	* - size - size of region
	* - dir - DMA direction
	*/
	ENTRY(v7_dma_unmap_area)
	add r1, r1, r0
	teq r2, #DMA_TO_DEVICE
	bne v7_dma_inv_range
	ret lr
	ENDPROC(v7_dma_unmap_area)

	__INITDATA

	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
	define_cache_functions v7