arch/arm/mm/proc-arm940.S - kernel/msm-4.9 - Gitiles

 /*
  *  linux/arch/arm/mm/arm940.S: utility functions for ARM940T
  *
  *  Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
  *
  * 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.
  *
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
 #include <asm/hwcap.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
 #include <asm/ptrace.h>
 #include "proc-macros.S"

 /* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
 #define CACHE_DLINESIZE	16
 #define CACHE_DSEGMENTS	4
 #define CACHE_DENTRIES	64

 	.text
 /*
  * cpu_arm940_proc_init()
  * cpu_arm940_switch_mm()
  *
  * These are not required.
  */
 ENTRY(cpu_arm940_proc_init)
 ENTRY(cpu_arm940_switch_mm)
 	ret	lr

 /*
  * cpu_arm940_proc_fin()
  */
 ENTRY(cpu_arm940_proc_fin)
 	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
 	bic	r0, r0, #0x00001000		@ i-cache
 	bic	r0, r0, #0x00000004		@ d-cache
 	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
 	ret	lr

 /*
  * cpu_arm940_reset(loc)
  * Params  : r0 = address to jump to
  * Notes   : This sets up everything for a reset
  */
 	.pushsection	.idmap.text, "ax"
 ENTRY(cpu_arm940_reset)
 	mov	ip, #0
 	mcr	p15, 0, ip, c7, c5, 0		@ flush I cache
 	mcr	p15, 0, ip, c7, c6, 0		@ flush D cache
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
 	bic	ip, ip, #0x00000005		@ .............c.p
 	bic	ip, ip, #0x00001000		@ i-cache
 	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
 	ret	r0
 ENDPROC(cpu_arm940_reset)
 	.popsection

 /*
  * cpu_arm940_do_idle()
  */
 	.align	5
 ENTRY(cpu_arm940_do_idle)
 	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt
 	ret	lr

 /*
  *	flush_icache_all()
  *
  *	Unconditionally clean and invalidate the entire icache.
  */
 ENTRY(arm940_flush_icache_all)
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
 	ret	lr
 ENDPROC(arm940_flush_icache_all)

 /*
  *	flush_user_cache_all()
  */
 ENTRY(arm940_flush_user_cache_all)
 	/* FALLTHROUGH */

 /*
  *	flush_kern_cache_all()
  *
  *	Clean and invalidate the entire cache.
  */
 ENTRY(arm940_flush_kern_cache_all)
 	mov	r2, #VM_EXEC
 	/* FALLTHROUGH */

 /*
  *	flush_user_cache_range(start, end, flags)
  *
  *	There is no efficient way to flush a range of cache entries
  *	in the specified address range. Thus, flushes all.
  *
  *	- start	- start address (inclusive)
  *	- end	- end address (exclusive)
  *	- flags	- vm_flags describing address space
  */
 ENTRY(arm940_flush_user_cache_range)
 	mov	ip, #0
 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
 	mcr	p15, 0, ip, c7, c6, 0		@ flush D cache
 #else
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D index
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 4
 	bcs	1b				@ segments 3 to 0
 #endif
 	tst	r2, #VM_EXEC
 	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
 	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, end.  If you have non-snooping
  *	Harvard caches, you need to implement this function.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm940_coherent_kern_range)
 	/* FALLTHROUGH */

 /*
  *	coherent_user_range(start, end)
  *
  *	Ensure coherency between the Icache and the Dcache in the
  *	region described by start, end.  If you have non-snooping
  *	Harvard caches, you need to implement this function.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm940_coherent_user_range)
 	/* FALLTHROUGH */

 /*
  *	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(arm940_flush_kern_dcache_area)
 	mov	r0, #0
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D index
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 4
 	bcs	1b				@ segments 7 to 0
 	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
 	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_inv_range(start, end)
  *
  *	There is no efficient way to invalidate a specifid virtual
  *	address range. Thus, invalidates all.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 arm940_dma_inv_range:
 	mov	ip, #0
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:	mcr	p15, 0, r3, c7, c6, 2		@ flush D entry
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 4
 	bcs	1b				@ segments 7 to 0
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_clean_range(start, end)
  *
  *	There is no efficient way to clean a specifid virtual
  *	address range. Thus, cleans all.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 arm940_dma_clean_range:
 ENTRY(cpu_arm940_dcache_clean_area)
 	mov	ip, #0
 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:	mcr	p15, 0, r3, c7, c10, 2		@ clean D entry
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 4
 	bcs	1b				@ segments 7 to 0
 #endif
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	ret	lr

 /*
  *	dma_flush_range(start, end)
  *
  *	There is no efficient way to clean and invalidate a specifid
  *	virtual address range.
  *
  *	- start	- virtual start address
  *	- end	- virtual end address
  */
 ENTRY(arm940_dma_flush_range)
 	mov	ip, #0
 	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments
 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
 2:
 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
 	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D entry
 #else
 	mcr	p15, 0, r3, c7, c6, 2		@ invalidate D entry
 #endif
 	subs	r3, r3, #1 << 26
 	bcs	2b				@ entries 63 to 0
 	subs	r1, r1, #1 << 4
 	bcs	1b				@ segments 7 to 0
 	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(arm940_dma_map_area)
 	add	r1, r1, r0
 	cmp	r2, #DMA_TO_DEVICE
 	beq	arm940_dma_clean_range
 	bcs	arm940_dma_inv_range
 	b	arm940_dma_flush_range
 ENDPROC(arm940_dma_map_area)

 /*
  *	dma_unmap_area(start, size, dir)
  *	- start	- kernel virtual start address
  *	- size	- size of region
  *	- dir	- DMA direction
  */
 ENTRY(arm940_dma_unmap_area)
 	ret	lr
 ENDPROC(arm940_dma_unmap_area)

 	.globl	arm940_flush_kern_cache_louis
 	.equ	arm940_flush_kern_cache_louis, arm940_flush_kern_cache_all

 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
 	define_cache_functions arm940

 	.type	__arm940_setup, #function
 __arm940_setup:
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
 	mcr	p15, 0, r0, c7, c6, 0		@ invalidate D cache
 	mcr	p15, 0, r0, c7, c10, 4		@ drain WB

 	mcr	p15, 0, r0, c6, c3, 0		@ disable data area 3~7
 	mcr	p15, 0, r0, c6, c4, 0
 	mcr	p15, 0, r0, c6, c5, 0
 	mcr	p15, 0, r0, c6, c6, 0
 	mcr	p15, 0, r0, c6, c7, 0

 	mcr	p15, 0, r0, c6, c3, 1		@ disable instruction area 3~7
 	mcr	p15, 0, r0, c6, c4, 1
 	mcr	p15, 0, r0, c6, c5, 1
 	mcr	p15, 0, r0, c6, c6, 1
 	mcr	p15, 0, r0, c6, c7, 1

 	mov	r0, #0x0000003F			@ base = 0, size = 4GB
 	mcr	p15, 0, r0, c6,	c0, 0		@ set area 0, default
 	mcr	p15, 0, r0, c6,	c0, 1

 	ldr	r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
 	ldr	r1, =(CONFIG_DRAM_SIZE >> 12)	@ size of RAM (must be >= 4KB)
 	mov	r2, #10				@ 11 is the minimum (4KB)
 1:	add	r2, r2, #1			@ area size *= 2
 	mov	r1, r1, lsr #1
 	bne	1b				@ count not zero r-shift
 	orr	r0, r0, r2, lsl #1		@ the area register value
 	orr	r0, r0, #1			@ set enable bit
 	mcr	p15, 0, r0, c6,	c1, 0		@ set area 1, RAM
 	mcr	p15, 0, r0, c6,	c1, 1

 	ldr	r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
 	ldr	r1, =(CONFIG_FLASH_SIZE >> 12)	@ size of FLASH (must be >= 4KB)
 	mov	r2, #10				@ 11 is the minimum (4KB)
 1:	add	r2, r2, #1			@ area size *= 2
 	mov	r1, r1, lsr #1
 	bne	1b				@ count not zero r-shift
 	orr	r0, r0, r2, lsl #1		@ the area register value
 	orr	r0, r0, #1			@ set enable bit
 	mcr	p15, 0, r0, c6,	c2, 0		@ set area 2, ROM/FLASH
 	mcr	p15, 0, r0, c6,	c2, 1

 	mov	r0, #0x06
 	mcr	p15, 0, r0, c2, c0, 0		@ Region 1&2 cacheable
 	mcr	p15, 0, r0, c2, c0, 1
 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
 	mov	r0, #0x00			@ disable whole write buffer
 #else
 	mov	r0, #0x02			@ Region 1 write bufferred
 #endif
 	mcr	p15, 0, r0, c3, c0, 0

 	mov	r0, #0x10000
 	sub	r0, r0, #1			@ r0 = 0xffff
 	mcr	p15, 0, r0, c5, c0, 0		@ all read/write access
 	mcr	p15, 0, r0, c5, c0, 1

 	mrc	p15, 0, r0, c1, c0		@ get control register
 	orr	r0, r0, #0x00001000		@ I-cache
 	orr	r0, r0, #0x00000005		@ MPU/D-cache

 	ret	lr

 	.size	__arm940_setup, . - __arm940_setup

 	__INITDATA

 	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
 	define_processor_functions arm940, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1

 	.section ".rodata"

 	string	cpu_arch_name, "armv4t"
 	string	cpu_elf_name, "v4"
 	string	cpu_arm940_name, "ARM940T"

 	.align

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

 	.type	__arm940_proc_info,#object
 __arm940_proc_info:
 	.long	0x41009400
 	.long	0xff00fff0
 	.long	0
 	b	__arm940_setup
 	.long	cpu_arch_name
 	.long	cpu_elf_name
 	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
 	.long	cpu_arm940_name
 	.long	arm940_processor_functions
 	.long	0
 	.long	0
 	.long	arm940_cache_fns
 	.size	__arm940_proc_info, . - __arm940_proc_info
	/*
	* linux/arch/arm/mm/arm940.S: utility functions for ARM940T
	*
	* Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
	*
	* 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.
	*
	*/
	#include <linux/linkage.h>
	#include <linux/init.h>
	#include <asm/assembler.h>
	#include <asm/hwcap.h>
	#include <asm/pgtable-hwdef.h>
	#include <asm/pgtable.h>
	#include <asm/ptrace.h>
	#include "proc-macros.S"

	/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
	#define CACHE_DLINESIZE 16
	#define CACHE_DSEGMENTS 4
	#define CACHE_DENTRIES 64

	.text
	/*
	* cpu_arm940_proc_init()
	* cpu_arm940_switch_mm()
	*
	* These are not required.
	*/
	ENTRY(cpu_arm940_proc_init)
	ENTRY(cpu_arm940_switch_mm)
	ret lr

	/*
	* cpu_arm940_proc_fin()
	*/
	ENTRY(cpu_arm940_proc_fin)
	mrc p15, 0, r0, c1, c0, 0 @ ctrl register
	bic r0, r0, #0x00001000 @ i-cache
	bic r0, r0, #0x00000004 @ d-cache
	mcr p15, 0, r0, c1, c0, 0 @ disable caches
	ret lr

	/*
	* cpu_arm940_reset(loc)
	* Params : r0 = address to jump to
	* Notes : This sets up everything for a reset
	*/
	.pushsection .idmap.text, "ax"
	ENTRY(cpu_arm940_reset)
	mov ip, #0
	mcr p15, 0, ip, c7, c5, 0 @ flush I cache
	mcr p15, 0, ip, c7, c6, 0 @ flush D cache
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	mrc p15, 0, ip, c1, c0, 0 @ ctrl register
	bic ip, ip, #0x00000005 @ .............c.p
	bic ip, ip, #0x00001000 @ i-cache
	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	ret r0
	ENDPROC(cpu_arm940_reset)
	.popsection

	/*
	* cpu_arm940_do_idle()
	*/
	.align 5
	ENTRY(cpu_arm940_do_idle)
	mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
	ret lr

	/*
	* flush_icache_all()
	*
	* Unconditionally clean and invalidate the entire icache.
	*/
	ENTRY(arm940_flush_icache_all)
	mov r0, #0
	mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
	ret lr
	ENDPROC(arm940_flush_icache_all)

	/*
	* flush_user_cache_all()
	*/
	ENTRY(arm940_flush_user_cache_all)
	/* FALLTHROUGH */

	/*
	* flush_kern_cache_all()
	*
	* Clean and invalidate the entire cache.
	*/
	ENTRY(arm940_flush_kern_cache_all)
	mov r2, #VM_EXEC
	/* FALLTHROUGH */

	/*
	* flush_user_cache_range(start, end, flags)
	*
	* There is no efficient way to flush a range of cache entries
	* in the specified address range. Thus, flushes all.
	*
	* - start - start address (inclusive)
	* - end - end address (exclusive)
	* - flags - vm_flags describing address space
	*/
	ENTRY(arm940_flush_user_cache_range)
	mov ip, #0
	#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
	mcr p15, 0, ip, c7, c6, 0 @ flush D cache
	#else
	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 4
	bcs 1b @ segments 3 to 0
	#endif
	tst r2, #VM_EXEC
	mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
	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, end. If you have non-snooping
	* Harvard caches, you need to implement this function.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm940_coherent_kern_range)
	/* FALLTHROUGH */

	/*
	* coherent_user_range(start, end)
	*
	* Ensure coherency between the Icache and the Dcache in the
	* region described by start, end. If you have non-snooping
	* Harvard caches, you need to implement this function.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm940_coherent_user_range)
	/* FALLTHROUGH */

	/*
	* 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(arm940_flush_kern_dcache_area)
	mov r0, #0
	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 4
	bcs 1b @ segments 7 to 0
	mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
	mcr p15, 0, r0, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_inv_range(start, end)
	*
	* There is no efficient way to invalidate a specifid virtual
	* address range. Thus, invalidates all.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	arm940_dma_inv_range:
	mov ip, #0
	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 4
	bcs 1b @ segments 7 to 0
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_clean_range(start, end)
	*
	* There is no efficient way to clean a specifid virtual
	* address range. Thus, cleans all.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	arm940_dma_clean_range:
	ENTRY(cpu_arm940_dcache_clean_area)
	mov ip, #0
	#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 4
	bcs 1b @ segments 7 to 0
	#endif
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	ret lr

	/*
	* dma_flush_range(start, end)
	*
	* There is no efficient way to clean and invalidate a specifid
	* virtual address range.
	*
	* - start - virtual start address
	* - end - virtual end address
	*/
	ENTRY(arm940_dma_flush_range)
	mov ip, #0
	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	2:
	#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
	mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry
	#else
	mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry
	#endif
	subs r3, r3, #1 << 26
	bcs 2b @ entries 63 to 0
	subs r1, r1, #1 << 4
	bcs 1b @ segments 7 to 0
	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(arm940_dma_map_area)
	add r1, r1, r0
	cmp r2, #DMA_TO_DEVICE
	beq arm940_dma_clean_range
	bcs arm940_dma_inv_range
	b arm940_dma_flush_range
	ENDPROC(arm940_dma_map_area)

	/*
	* dma_unmap_area(start, size, dir)
	* - start - kernel virtual start address
	* - size - size of region
	* - dir - DMA direction
	*/
	ENTRY(arm940_dma_unmap_area)
	ret lr
	ENDPROC(arm940_dma_unmap_area)

	.globl arm940_flush_kern_cache_louis
	.equ arm940_flush_kern_cache_louis, arm940_flush_kern_cache_all

	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
	define_cache_functions arm940

	.type __arm940_setup, #function
	__arm940_setup:
	mov r0, #0
	mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
	mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
	mcr p15, 0, r0, c7, c10, 4 @ drain WB

	mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7
	mcr p15, 0, r0, c6, c4, 0
	mcr p15, 0, r0, c6, c5, 0
	mcr p15, 0, r0, c6, c6, 0
	mcr p15, 0, r0, c6, c7, 0

	mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7
	mcr p15, 0, r0, c6, c4, 1
	mcr p15, 0, r0, c6, c5, 1
	mcr p15, 0, r0, c6, c6, 1
	mcr p15, 0, r0, c6, c7, 1

	mov r0, #0x0000003F @ base = 0, size = 4GB
	mcr p15, 0, r0, c6, c0, 0 @ set area 0, default
	mcr p15, 0, r0, c6, c0, 1

	ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
	ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
	mov r2, #10 @ 11 is the minimum (4KB)
	1: add r2, r2, #1 @ area size *= 2
	mov r1, r1, lsr #1
	bne 1b @ count not zero r-shift
	orr r0, r0, r2, lsl #1 @ the area register value
	orr r0, r0, #1 @ set enable bit
	mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM
	mcr p15, 0, r0, c6, c1, 1

	ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
	ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
	mov r2, #10 @ 11 is the minimum (4KB)
	1: add r2, r2, #1 @ area size *= 2
	mov r1, r1, lsr #1
	bne 1b @ count not zero r-shift
	orr r0, r0, r2, lsl #1 @ the area register value
	orr r0, r0, #1 @ set enable bit
	mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH
	mcr p15, 0, r0, c6, c2, 1

	mov r0, #0x06
	mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable
	mcr p15, 0, r0, c2, c0, 1
	#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
	mov r0, #0x00 @ disable whole write buffer
	#else
	mov r0, #0x02 @ Region 1 write bufferred
	#endif
	mcr p15, 0, r0, c3, c0, 0

	mov r0, #0x10000
	sub r0, r0, #1 @ r0 = 0xffff
	mcr p15, 0, r0, c5, c0, 0 @ all read/write access
	mcr p15, 0, r0, c5, c0, 1

	mrc p15, 0, r0, c1, c0 @ get control register
	orr r0, r0, #0x00001000 @ I-cache
	orr r0, r0, #0x00000005 @ MPU/D-cache

	ret lr

	.size __arm940_setup, . - __arm940_setup

	__INITDATA

	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
	define_processor_functions arm940, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1

	.section ".rodata"

	string cpu_arch_name, "armv4t"
	string cpu_elf_name, "v4"
	string cpu_arm940_name, "ARM940T"

	.align

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

	.type __arm940_proc_info,#object
	__arm940_proc_info:
	.long 0x41009400
	.long 0xff00fff0
	.long 0
	b __arm940_setup
	.long cpu_arch_name
	.long cpu_elf_name
	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_THUMB
	.long cpu_arm940_name
	.long arm940_processor_functions
	.long 0
	.long 0
	.long arm940_cache_fns
	.size __arm940_proc_info, . - __arm940_proc_info