arch/arm/mm/proc-arm1020e.S - kernel/msm-4.9 - Gitiles

 /*
  *  linux/arch/arm/mm/proc-arm1020e.S: MMU functions for ARM1020
  *
  *  Copyright (C) 2000 ARM Limited
  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
  *  hacked for non-paged-MM by Hyok S. Choi, 2003.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  *
  * These are the low level assembler for performing cache and TLB
  * functions on the arm1020e.
  *
  *  CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
 #include <asm/asm-offsets.h>
 #include <asm/hwcap.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
 #include <asm/ptrace.h>

 #include "proc-macros.S"

 /*
  * This is the maximum size of an area which will be invalidated
  * using the single invalidate entry instructions.  Anything larger
  * than this, and we go for the whole cache.
  *
  * This value should be chosen such that we choose the cheapest
  * alternative.
  */
 #define MAX_AREA_SIZE	32768

 /*
  * The size of one data cache line.
  */
 #define CACHE_DLINESIZE	32

 /*
  * The number of data cache segments.
  */
 #define CACHE_DSEGMENTS	16

 /*
  * The number of lines in a cache segment.
  */
 #define CACHE_DENTRIES	64

 /*
  * This is the size at which it becomes more efficient to
  * clean the whole cache, rather than using the individual
  * cache line maintenance instructions.
  */
 #define CACHE_DLIMIT	32768

 	.text
 /*
  * cpu_arm1020e_proc_init()
  */
 ENTRY(cpu_arm1020e_proc_init)
 	ret	lr

 /*
  * cpu_arm1020e_proc_fin()
  */
 ENTRY(cpu_arm1020e_proc_fin)
 	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
 	bic	r0, r0, #0x1000 		@ ...i............
 	bic	r0, r0, #0x000e 		@ ............wca.
 	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
 	ret	lr

 /*
  * cpu_arm1020e_reset(loc)
  *
  * Perform a soft reset of the system.	Put the CPU into the
  * same state as it would be if it had been reset, and branch
  * to what would be the reset vector.
  *
  * loc: location to jump to for soft reset
  */
 	.align	5
 	.pushsection	.idmap.text, "ax"
 ENTRY(cpu_arm1020e_reset)
 	mov	ip, #0
 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 #ifdef CONFIG_MMU
 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
 #endif
 	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
 	bic	ip, ip, #0x000f 		@ ............wcam
 	bic	ip, ip, #0x1100 		@ ...i...s........
 	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
 	ret	r0
 ENDPROC(cpu_arm1020e_reset)
 	.popsection

 /*
  * cpu_arm1020e_do_idle()
  */
 	.align	5
 ENTRY(cpu_arm1020e_do_idle)
 	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt
 	ret	lr

 /* ================================= CACHE ================================ */

 	.align	5

 /*
  *	flush_icache_all()
  *
  *	Unconditionally clean and invalidate the entire icache.
  */
 ENTRY(arm1020e_flush_icache_all)
 #ifndef CONFIG_CPU_ICACHE_DISABLE
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
 #endif
 	ret	lr
 ENDPROC(arm1020e_flush_icache_all)

 /*
  *	flush_user_cache_all()
  *
  *	Invalidate all cache entries in a particular address
  *	space.
  */
 ENTRY(arm1020e_flush_user_cache_all)
 	/* FALLTHROUGH */
 /*
  *	flush_kern_cache_all()
  *
  *	Clean and invalidate the entire cache.
  */
 ENTRY(arm1020e_flush_kern_cache_all)
 	mov	r2, #VM_EXEC
 	mov	ip, #0
 __flush_whole_cache:
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 5	@ 16 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:	mcr	p15, 0, r3, c7, c14, 2		@ clean+invalidate D index
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 5
 	bcs	1b				@ segments 15 to 0
 #endif
 	tst	r2, #VM_EXEC
 #ifndef CONFIG_CPU_ICACHE_DISABLE
 	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
 #endif
 	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	flush_user_cache_range(start, end, flags)
  *
  *	Invalidate a range of cache entries in the specified
  *	address space.
  *
  *	- start	- start address (inclusive)
  *	- end	- end address (exclusive)
  *	- flags	- vm_flags for this space
  */
 ENTRY(arm1020e_flush_user_cache_range)
 	mov	ip, #0
 	sub	r3, r1, r0			@ calculate total size
 	cmp	r3, #CACHE_DLIMIT
 	bhs	__flush_whole_cache

 #ifndef CONFIG_CPU_DCACHE_DISABLE
 1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 #endif
 	tst	r2, #VM_EXEC
 #ifndef CONFIG_CPU_ICACHE_DISABLE
 	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
 #endif
 	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	coherent_kern_range(start, end)
  *
  *	Ensure coherency between the Icache and the Dcache in the
  *	region described by start.  If you have non-snooping
  *	Harvard caches, you need to implement this function.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm1020e_coherent_kern_range)
 	/* FALLTHROUGH */
 /*
  *	coherent_user_range(start, end)
  *
  *	Ensure coherency between the Icache and the Dcache in the
  *	region described by start.  If you have non-snooping
  *	Harvard caches, you need to implement this function.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm1020e_coherent_user_range)
 	mov	ip, #0
 	bic	r0, r0, #CACHE_DLINESIZE - 1
 1:
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 #endif
 #ifndef CONFIG_CPU_ICACHE_DISABLE
 	mcr	p15, 0, r0, c7, c5, 1		@ invalidate I entry
 #endif
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	mov	r0, #0
 	ret	lr

 /*
  *	flush_kern_dcache_area(void *addr, size_t size)
  *
  *	Ensure no D cache aliasing occurs, either with itself or
  *	the I cache
  *
  *	- addr	- kernel address
  *	- size	- region size
  */
 ENTRY(arm1020e_flush_kern_dcache_area)
 	mov	ip, #0
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	add	r1, r0, r1
 1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 #endif
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_inv_range(start, end)
  *
  *	Invalidate (discard) the specified virtual address range.
  *	May not write back any entries.  If 'start' or 'end'
  *	are not cache line aligned, those lines must be written
  *	back.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  *
  * (same as v4wb)
  */
 arm1020e_dma_inv_range:
 	mov	ip, #0
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	tst	r0, #CACHE_DLINESIZE - 1
 	bic	r0, r0, #CACHE_DLINESIZE - 1
 	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry
 	tst	r1, #CACHE_DLINESIZE - 1
 	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry
 1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 #endif
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_clean_range(start, end)
  *
  *	Clean the specified virtual address range.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  *
  * (same as v4wb)
  */
 arm1020e_dma_clean_range:
 	mov	ip, #0
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	bic	r0, r0, #CACHE_DLINESIZE - 1
 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 #endif
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_flush_range(start, end)
  *
  *	Clean and invalidate the specified virtual address range.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm1020e_dma_flush_range)
 	mov	ip, #0
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	bic	r0, r0, #CACHE_DLINESIZE - 1
 1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	cmp	r0, r1
 	blo	1b
 #endif
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_map_area(start, size, dir)
  *	- start	- kernel virtual start address
  *	- size	- size of region
  *	- dir	- DMA direction
  */
 ENTRY(arm1020e_dma_map_area)
 	add	r1, r1, r0
 	cmp	r2, #DMA_TO_DEVICE
 	beq	arm1020e_dma_clean_range
 	bcs	arm1020e_dma_inv_range
 	b	arm1020e_dma_flush_range
 ENDPROC(arm1020e_dma_map_area)

 /*
  *	dma_unmap_area(start, size, dir)
  *	- start	- kernel virtual start address
  *	- size	- size of region
  *	- dir	- DMA direction
  */
 ENTRY(arm1020e_dma_unmap_area)
 	ret	lr
 ENDPROC(arm1020e_dma_unmap_area)

 	.globl	arm1020e_flush_kern_cache_louis
 	.equ	arm1020e_flush_kern_cache_louis, arm1020e_flush_kern_cache_all

 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 	define_cache_functions arm1020e

 	.align	5
 ENTRY(cpu_arm1020e_dcache_clean_area)
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	mov	ip, #0
 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 	add	r0, r0, #CACHE_DLINESIZE
 	subs	r1, r1, #CACHE_DLINESIZE
 	bhi	1b
 #endif
 	ret	lr

 /* =============================== PageTable ============================== */

 /*
  * cpu_arm1020e_switch_mm(pgd)
  *
  * Set the translation base pointer to be as described by pgd.
  *
  * pgd: new page tables
  */
 	.align	5
 ENTRY(cpu_arm1020e_switch_mm)
 #ifdef CONFIG_MMU
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	mcr	p15, 0, r3, c7, c10, 4
 	mov	r1, #0xF			@ 16 segments
 1:	mov	r3, #0x3F			@ 64 entries
 2:	mov	ip, r3, LSL #26 		@ shift up entry
 	orr	ip, ip, r1, LSL #5		@ shift in/up index
 	mcr	p15, 0, ip, c7, c14, 2		@ Clean & Inval DCache entry
 	mov	ip, #0
 	subs	r3, r3, #1
 	cmp	r3, #0
 	bge	2b				@ entries 3F to 0
 	subs	r1, r1, #1
 	cmp	r1, #0
 	bge	1b				@ segments 15 to 0

 #endif
 	mov	r1, #0
 #ifndef CONFIG_CPU_ICACHE_DISABLE
 	mcr	p15, 0, r1, c7, c5, 0		@ invalidate I cache
 #endif
 	mcr	p15, 0, r1, c7, c10, 4		@ drain WB
 	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
 	mcr	p15, 0, r1, c8, c7, 0		@ invalidate I & D TLBs
 #endif
 	ret	lr

 /*
  * cpu_arm1020e_set_pte(ptep, pte)
  *
  * Set a PTE and flush it out
  */
 	.align	5
 ENTRY(cpu_arm1020e_set_pte_ext)
 #ifdef CONFIG_MMU
 	armv3_set_pte_ext
 	mov	r0, r0
 #ifndef CONFIG_CPU_DCACHE_DISABLE
 	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 #endif
 #endif /* CONFIG_MMU */
 	ret	lr

 	.type	__arm1020e_setup, #function
 __arm1020e_setup:
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
 	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
 #ifdef CONFIG_MMU
 	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
 #endif
 	adr	r5, arm1020e_crval
 	ldmia	r5, {r5, r6}
 	mrc	p15, 0, r0, c1, c0		@ get control register v4
 	bic	r0, r0, r5
 	orr	r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
 	orr	r0, r0, #0x4000 		@ .R.. .... .... ....
 #endif
 	ret	lr
 	.size	__arm1020e_setup, . - __arm1020e_setup

 	/*
 	 *  R
 	 * .RVI ZFRS BLDP WCAM
 	 * .011 1001 ..11 0101
 	 */
 	.type	arm1020e_crval, #object
 arm1020e_crval:
 	crval	clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930

 	__INITDATA
 	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
 	define_processor_functions arm1020e, dabort=v4t_early_abort, pabort=legacy_pabort

 	.section ".rodata"

 	string	cpu_arch_name, "armv5te"
 	string	cpu_elf_name, "v5"
 	string	cpu_arm1020e_name, "ARM1020E"

 	.align

 	.section ".proc.info.init", #alloc, #execinstr

 	.type	__arm1020e_proc_info,#object
 __arm1020e_proc_info:
 	.long	0x4105a200			@ ARM 1020TE (Architecture v5TE)
 	.long	0xff0ffff0
 	.long   PMD_TYPE_SECT | \
 		PMD_BIT4 | \
 		PMD_SECT_AP_WRITE | \
 		PMD_SECT_AP_READ
 	.long   PMD_TYPE_SECT | \
 		PMD_BIT4 | \
 		PMD_SECT_AP_WRITE | \
 		PMD_SECT_AP_READ
 	b	__arm1020e_setup
 	.long	cpu_arch_name
 	.long	cpu_elf_name
 	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
 	.long	cpu_arm1020e_name
 	.long	arm1020e_processor_functions
 	.long	v4wbi_tlb_fns
 	.long	v4wb_user_fns
 	.long	arm1020e_cache_fns
 	.size	__arm1020e_proc_info, . - __arm1020e_proc_info
	/*
	* linux/arch/arm/mm/proc-arm1020e.S: MMU functions for ARM1020
	*
	* Copyright (C) 2000 ARM Limited
	* Copyright (C) 2000 Deep Blue Solutions Ltd.
	* hacked for non-paged-MM by Hyok S. Choi, 2003.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*
	* These are the low level assembler for performing cache and TLB
	* functions on the arm1020e.
	*
	* CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
	*/
	#include <linux/linkage.h>
	#include <linux/init.h>
	#include <asm/assembler.h>
	#include <asm/asm-offsets.h>
	#include <asm/hwcap.h>
	#include <asm/pgtable-hwdef.h>
	#include <asm/pgtable.h>
	#include <asm/ptrace.h>

	#include "proc-macros.S"

	/*
	* This is the maximum size of an area which will be invalidated
	* using the single invalidate entry instructions. Anything larger
	* than this, and we go for the whole cache.
	*
	* This value should be chosen such that we choose the cheapest
	* alternative.
	*/
	#define MAX_AREA_SIZE 32768

	/*
	* The size of one data cache line.
	*/
	#define CACHE_DLINESIZE 32

	/*
	* The number of data cache segments.
	*/
	#define CACHE_DSEGMENTS 16

	/*
	* The number of lines in a cache segment.
	*/
	#define CACHE_DENTRIES 64

	/*
	* This is the size at which it becomes more efficient to
	* clean the whole cache, rather than using the individual
	* cache line maintenance instructions.
	*/
	#define CACHE_DLIMIT 32768

	.text
	/*
	* cpu_arm1020e_proc_init()
	*/
	ENTRY(cpu_arm1020e_proc_init)
	ret lr

	/*
	* cpu_arm1020e_proc_fin()
	*/
	ENTRY(cpu_arm1020e_proc_fin)
	mrc p15, 0, r0, c1, c0, 0 @ ctrl register
	bic r0, r0, #0x1000 @ ...i............
	bic r0, r0, #0x000e @ ............wca.
	mcr p15, 0, r0, c1, c0, 0 @ disable caches
	ret lr

	/*
	* cpu_arm1020e_reset(loc)
	*
	* Perform a soft reset of the system. Put the CPU into the
	* same state as it would be if it had been reset, and branch
	* to what would be the reset vector.
	*
	* loc: location to jump to for soft reset
	*/
	.align 5
	.pushsection .idmap.text, "ax"
	ENTRY(cpu_arm1020e_reset)
	mov ip, #0
	mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	#ifdef CONFIG_MMU
	mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
	#endif
	mrc p15, 0, ip, c1, c0, 0 @ ctrl register
	bic ip, ip, #0x000f @ ............wcam
	bic ip, ip, #0x1100 @ ...i...s........
	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	ret r0
	ENDPROC(cpu_arm1020e_reset)
	.popsection

	/*
	* cpu_arm1020e_do_idle()
	*/
	.align 5
	ENTRY(cpu_arm1020e_do_idle)
	mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
	ret lr

	/* ================================= CACHE ================================ */

	.align 5

	/*
	* flush_icache_all()
	*
	* Unconditionally clean and invalidate the entire icache.
	*/
	ENTRY(arm1020e_flush_icache_all)
	#ifndef CONFIG_CPU_ICACHE_DISABLE
	mov r0, #0
	mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
	#endif
	ret lr
	ENDPROC(arm1020e_flush_icache_all)

	/*
	* flush_user_cache_all()
	*
	* Invalidate all cache entries in a particular address
	* space.
	*/
	ENTRY(arm1020e_flush_user_cache_all)
	/* FALLTHROUGH */
	/*
	* flush_kern_cache_all()
	*
	* Clean and invalidate the entire cache.
	*/
	ENTRY(arm1020e_flush_kern_cache_all)
	mov r2, #VM_EXEC
	mov ip, #0
	__flush_whole_cache:
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 5
	bcs 1b @ segments 15 to 0
	#endif
	tst r2, #VM_EXEC
	#ifndef CONFIG_CPU_ICACHE_DISABLE
	mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
	#endif
	mcrne p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* flush_user_cache_range(start, end, flags)
	*
	* Invalidate a range of cache entries in the specified
	* address space.
	*
	* - start - start address (inclusive)
	* - end - end address (exclusive)
	* - flags - vm_flags for this space
	*/
	ENTRY(arm1020e_flush_user_cache_range)
	mov ip, #0
	sub r3, r1, r0 @ calculate total size
	cmp r3, #CACHE_DLIMIT
	bhs __flush_whole_cache

	#ifndef CONFIG_CPU_DCACHE_DISABLE
	1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	#endif
	tst r2, #VM_EXEC
	#ifndef CONFIG_CPU_ICACHE_DISABLE
	mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
	#endif
	mcrne p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* coherent_kern_range(start, end)
	*
	* Ensure coherency between the Icache and the Dcache in the
	* region described by start. If you have non-snooping
	* Harvard caches, you need to implement this function.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm1020e_coherent_kern_range)
	/* FALLTHROUGH */
	/*
	* coherent_user_range(start, end)
	*
	* Ensure coherency between the Icache and the Dcache in the
	* region described by start. If you have non-snooping
	* Harvard caches, you need to implement this function.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm1020e_coherent_user_range)
	mov ip, #0
	bic r0, r0, #CACHE_DLINESIZE - 1
	1:
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	#endif
	#ifndef CONFIG_CPU_ICACHE_DISABLE
	mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
	#endif
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	mov r0, #0
	ret lr

	/*
	* flush_kern_dcache_area(void *addr, size_t size)
	*
	* Ensure no D cache aliasing occurs, either with itself or
	* the I cache
	*
	* - addr - kernel address
	* - size - region size
	*/
	ENTRY(arm1020e_flush_kern_dcache_area)
	mov ip, #0
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	add r1, r0, r1
	1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	#endif
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_inv_range(start, end)
	*
	* Invalidate (discard) the specified virtual address range.
	* May not write back any entries. If 'start' or 'end'
	* are not cache line aligned, those lines must be written
	* back.
	*
	* - start - virtual start address
	* - end - virtual end address
	*
	* (same as v4wb)
	*/
	arm1020e_dma_inv_range:
	mov ip, #0
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	tst r0, #CACHE_DLINESIZE - 1
	bic r0, r0, #CACHE_DLINESIZE - 1
	mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
	tst r1, #CACHE_DLINESIZE - 1
	mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
	1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	#endif
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_clean_range(start, end)
	*
	* Clean the specified virtual address range.
	*
	* - start - virtual start address
	* - end - virtual end address
	*
	* (same as v4wb)
	*/
	arm1020e_dma_clean_range:
	mov ip, #0
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	bic r0, r0, #CACHE_DLINESIZE - 1
	1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	#endif
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_flush_range(start, end)
	*
	* Clean and invalidate the specified virtual address range.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm1020e_dma_flush_range)
	mov ip, #0
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	bic r0, r0, #CACHE_DLINESIZE - 1
	1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
	add r0, r0, #CACHE_DLINESIZE
	cmp r0, r1
	blo 1b
	#endif
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_map_area(start, size, dir)
	* - start - kernel virtual start address
	* - size - size of region
	* - dir - DMA direction
	*/
	ENTRY(arm1020e_dma_map_area)
	add r1, r1, r0
	cmp r2, #DMA_TO_DEVICE
	beq arm1020e_dma_clean_range
	bcs arm1020e_dma_inv_range
	b arm1020e_dma_flush_range
	ENDPROC(arm1020e_dma_map_area)

	/*
	* dma_unmap_area(start, size, dir)
	* - start - kernel virtual start address
	* - size - size of region
	* - dir - DMA direction
	*/
	ENTRY(arm1020e_dma_unmap_area)
	ret lr
	ENDPROC(arm1020e_dma_unmap_area)

	.globl arm1020e_flush_kern_cache_louis
	.equ arm1020e_flush_kern_cache_louis, arm1020e_flush_kern_cache_all

	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
	define_cache_functions arm1020e

	.align 5
	ENTRY(cpu_arm1020e_dcache_clean_area)
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	mov ip, #0
	1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	add r0, r0, #CACHE_DLINESIZE
	subs r1, r1, #CACHE_DLINESIZE
	bhi 1b
	#endif
	ret lr

	/* =============================== PageTable ============================== */

	/*
	* cpu_arm1020e_switch_mm(pgd)
	*
	* Set the translation base pointer to be as described by pgd.
	*
	* pgd: new page tables
	*/
	.align 5
	ENTRY(cpu_arm1020e_switch_mm)
	#ifdef CONFIG_MMU
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	mcr p15, 0, r3, c7, c10, 4
	mov r1, #0xF @ 16 segments
	1: mov r3, #0x3F @ 64 entries
	2: mov ip, r3, LSL #26 @ shift up entry
	orr ip, ip, r1, LSL #5 @ shift in/up index
	mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
	mov ip, #0
	subs r3, r3, #1
	cmp r3, #0
	bge 2b @ entries 3F to 0
	subs r1, r1, #1
	cmp r1, #0
	bge 1b @ segments 15 to 0

	#endif
	mov r1, #0
	#ifndef CONFIG_CPU_ICACHE_DISABLE
	mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
	#endif
	mcr p15, 0, r1, c7, c10, 4 @ drain WB
	mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
	mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
	#endif
	ret lr

	/*
	* cpu_arm1020e_set_pte(ptep, pte)
	*
	* Set a PTE and flush it out
	*/
	.align 5
	ENTRY(cpu_arm1020e_set_pte_ext)
	#ifdef CONFIG_MMU
	armv3_set_pte_ext
	mov r0, r0
	#ifndef CONFIG_CPU_DCACHE_DISABLE
	mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	#endif
	#endif /* CONFIG_MMU */
	ret lr

	.type __arm1020e_setup, #function
	__arm1020e_setup:
	mov r0, #0
	mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
	mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
	#ifdef CONFIG_MMU
	mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
	#endif
	adr r5, arm1020e_crval
	ldmia r5, {r5, r6}
	mrc p15, 0, r0, c1, c0 @ get control register v4
	bic r0, r0, r5
	orr r0, r0, r6
	#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
	orr r0, r0, #0x4000 @ .R.. .... .... ....
	#endif
	ret lr
	.size __arm1020e_setup, . - __arm1020e_setup

	/*
	* R
	* .RVI ZFRS BLDP WCAM
	* .011 1001 ..11 0101
	*/
	.type arm1020e_crval, #object
	arm1020e_crval:
	crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930

	__INITDATA
	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
	define_processor_functions arm1020e, dabort=v4t_early_abort, pabort=legacy_pabort

	.section ".rodata"

	string cpu_arch_name, "armv5te"
	string cpu_elf_name, "v5"
	string cpu_arm1020e_name, "ARM1020E"

	.align

	.section ".proc.info.init", #alloc, #execinstr

	.type __arm1020e_proc_info,#object
	__arm1020e_proc_info:
	.long 0x4105a200 @ ARM 1020TE (Architecture v5TE)
	.long 0xff0ffff0
	.long PMD_TYPE_SECT \| \
	PMD_BIT4 \| \
	PMD_SECT_AP_WRITE \| \
	PMD_SECT_AP_READ
	.long PMD_TYPE_SECT \| \
	PMD_BIT4 \| \
	PMD_SECT_AP_WRITE \| \
	PMD_SECT_AP_READ
	b __arm1020e_setup
	.long cpu_arch_name
	.long cpu_elf_name
	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_THUMB \| HWCAP_EDSP
	.long cpu_arm1020e_name
	.long arm1020e_processor_functions
	.long v4wbi_tlb_fns
	.long v4wb_user_fns
	.long arm1020e_cache_fns
	.size __arm1020e_proc_info, . - __arm1020e_proc_info