arch/arm/mm/proc-arm720.S - kernel/prism - Git at Google

 /*
  *  linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
  *
  *  Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
  *                     Rob Scott (rscott@mtrob.fdns.net)
  *  Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
  *  hacked for non-paged-MM by Hyok S. Choi, 2004.
  *
  * 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 ARM720T.  The ARM720T has a writethrough IDC
  * cache, so we don't need to clean it.
  *
  *  Changelog:
  *   05-09-2000 SJH	Created by moving 720 specific functions
  *			out of 'proc-arm6,7.S' per RMK discussion
  *   07-25-2000 SJH	Added idle function.
  *   08-25-2000	DBS	Updated for integration of ARM Ltd version.
  *   04-20-2004 HSC	modified for non-paged memory management mode.
  */
 #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"

 /*
  * Function: arm720_proc_init (void)
  *	   : arm720_proc_fin (void)
  *
  * Notes   : This processor does not require these
  */
 ENTRY(cpu_arm720_dcache_clean_area)
 ENTRY(cpu_arm720_proc_init)
 		mov	pc, lr

 ENTRY(cpu_arm720_proc_fin)
 		stmfd	sp!, {lr}
 		mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
 		msr	cpsr_c, ip
 		mrc	p15, 0, r0, c1, c0, 0
 		bic	r0, r0, #0x1000			@ ...i............
 		bic	r0, r0, #0x000e			@ ............wca.
 		mcr	p15, 0, r0, c1, c0, 0		@ disable caches
 		mcr	p15, 0, r1, c7, c7, 0		@ invalidate cache
 		ldmfd	sp!, {pc}

 /*
  * Function: arm720_proc_do_idle(void)
  * Params  : r0 = unused
  * Purpose : put the processer in proper idle mode
  */
 ENTRY(cpu_arm720_do_idle)
 		mov	pc, lr

 /*
  * Function: arm720_switch_mm(unsigned long pgd_phys)
  * Params  : pgd_phys	Physical address of page table
  * Purpose : Perform a task switch, saving the old process' state and restoring
  *	     the new.
  */
 ENTRY(cpu_arm720_switch_mm)
 #ifdef CONFIG_MMU
 		mov	r1, #0
 		mcr	p15, 0, r1, c7, c7, 0		@ invalidate cache
 		mcr	p15, 0, r0, c2, c0, 0		@ update page table ptr
 		mcr	p15, 0, r1, c8, c7, 0		@ flush TLB (v4)
 #endif
 		mov	pc, lr

 /*
  * Function: arm720_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext)
  * Params  : r0 = Address to set
  *	   : r1 = value to set
  * Purpose : Set a PTE and flush it out of any WB cache
  */
 	.align	5
 ENTRY(cpu_arm720_set_pte_ext)
 #ifdef CONFIG_MMU
 	armv3_set_pte_ext wc_disable=0
 #endif
 	mov	pc, lr

 /*
  * Function: arm720_reset
  * Params  : r0 = address to jump to
  * Notes   : This sets up everything for a reset
  */
 ENTRY(cpu_arm720_reset)
 		mov	ip, #0
 		mcr	p15, 0, ip, c7, c7, 0		@ invalidate cache
 #ifdef CONFIG_MMU
 		mcr	p15, 0, ip, c8, c7, 0		@ flush TLB (v4)
 #endif
 		mrc	p15, 0, ip, c1, c0, 0		@ get ctrl register
 		bic	ip, ip, #0x000f			@ ............wcam
 		bic	ip, ip, #0x2100			@ ..v....s........
 		mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
 		mov	pc, r0

 	__INIT

 	.type	__arm710_setup, #function
 __arm710_setup:
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c7, 0		@ invalidate caches
 #ifdef CONFIG_MMU
 	mcr	p15, 0, r0, c8, c7, 0		@ flush TLB (v4)
 #endif
 	mrc	p15, 0, r0, c1, c0		@ get control register
 	ldr	r5, arm710_cr1_clear
 	bic	r0, r0, r5
 	ldr	r5, arm710_cr1_set
 	orr	r0, r0, r5
 	mov	pc, lr				@ __ret (head.S)
 	.size	__arm710_setup, . - __arm710_setup

 	/*
 	 *  R
 	 * .RVI ZFRS BLDP WCAM
 	 * .... 0001 ..11 1101
 	 *
 	 */
 	.type	arm710_cr1_clear, #object
 	.type	arm710_cr1_set, #object
 arm710_cr1_clear:
 	.word	0x0f3f
 arm710_cr1_set:
 	.word	0x013d

 	.type	__arm720_setup, #function
 __arm720_setup:
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c7, 0		@ invalidate caches
 #ifdef CONFIG_MMU
 	mcr	p15, 0, r0, c8, c7, 0		@ flush TLB (v4)
 #endif
 	adr	r5, arm720_crval
 	ldmia	r5, {r5, r6}
 	mrc	p15, 0, r0, c1, c0		@ get control register
 	bic	r0, r0, r5
 	orr	r0, r0, r6
 	mov	pc, lr				@ __ret (head.S)
 	.size	__arm720_setup, . - __arm720_setup

 	/*
 	 *  R
 	 * .RVI ZFRS BLDP WCAM
 	 * ..1. 1001 ..11 1101
 	 *
 	 */
 	.type	arm720_crval, #object
 arm720_crval:
 	crval	clear=0x00002f3f, mmuset=0x0000213d, ucset=0x00000130

 		__INITDATA

 /*
  * Purpose : Function pointers used to access above functions - all calls
  *	     come through these
  */
 		.type	arm720_processor_functions, #object
 ENTRY(arm720_processor_functions)
 		.word	v4t_late_abort
 		.word	legacy_pabort
 		.word	cpu_arm720_proc_init
 		.word	cpu_arm720_proc_fin
 		.word	cpu_arm720_reset
 		.word	cpu_arm720_do_idle
 		.word	cpu_arm720_dcache_clean_area
 		.word	cpu_arm720_switch_mm
 		.word	cpu_arm720_set_pte_ext
 		.size	arm720_processor_functions, . - arm720_processor_functions

 		.section ".rodata"

 		.type	cpu_arch_name, #object
 cpu_arch_name:	.asciz	"armv4t"
 		.size	cpu_arch_name, . - cpu_arch_name

 		.type	cpu_elf_name, #object
 cpu_elf_name:	.asciz	"v4"
 		.size	cpu_elf_name, . - cpu_elf_name

 		.type	cpu_arm710_name, #object
 cpu_arm710_name:
 		.asciz	"ARM710T"
 		.size	cpu_arm710_name, . - cpu_arm710_name

 		.type	cpu_arm720_name, #object
 cpu_arm720_name:
 		.asciz	"ARM720T"
 		.size	cpu_arm720_name, . - cpu_arm720_name

 		.align

 /*
  * See <asm/procinfo.h> for a definition of this structure.
  */

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

 		.type	__arm710_proc_info, #object
 __arm710_proc_info:
 		.long	0x41807100				@ cpu_val
 		.long	0xffffff00				@ cpu_mask
 		.long   PMD_TYPE_SECT | \
 			PMD_SECT_BUFFERABLE | \
 			PMD_SECT_CACHEABLE | \
 			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	__arm710_setup				@ cpu_flush
 		.long	cpu_arch_name				@ arch_name
 		.long	cpu_elf_name				@ elf_name
 		.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB	@ elf_hwcap
 		.long	cpu_arm710_name				@ name
 		.long	arm720_processor_functions
 		.long	v4_tlb_fns
 		.long	v4wt_user_fns
 		.long	v4_cache_fns
 		.size	__arm710_proc_info, . - __arm710_proc_info

 		.type	__arm720_proc_info, #object
 __arm720_proc_info:
 		.long	0x41807200				@ cpu_val
 		.long	0xffffff00				@ cpu_mask
 		.long   PMD_TYPE_SECT | \
 			PMD_SECT_BUFFERABLE | \
 			PMD_SECT_CACHEABLE | \
 			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	__arm720_setup				@ cpu_flush
 		.long	cpu_arch_name				@ arch_name
 		.long	cpu_elf_name				@ elf_name
 		.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB	@ elf_hwcap
 		.long	cpu_arm720_name				@ name
 		.long	arm720_processor_functions
 		.long	v4_tlb_fns
 		.long	v4wt_user_fns
 		.long	v4_cache_fns
 		.size	__arm720_proc_info, . - __arm720_proc_info
	/*
	* linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
	*
	* Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
	* Rob Scott (rscott@mtrob.fdns.net)
	* Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
	* hacked for non-paged-MM by Hyok S. Choi, 2004.
	*
	* 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 ARM720T. The ARM720T has a writethrough IDC
	* cache, so we don't need to clean it.
	*
	* Changelog:
	* 05-09-2000 SJH Created by moving 720 specific functions
	* out of 'proc-arm6,7.S' per RMK discussion
	* 07-25-2000 SJH Added idle function.
	* 08-25-2000 DBS Updated for integration of ARM Ltd version.
	* 04-20-2004 HSC modified for non-paged memory management mode.
	*/
	#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"

	/*
	* Function: arm720_proc_init (void)
	* : arm720_proc_fin (void)
	*
	* Notes : This processor does not require these
	*/
	ENTRY(cpu_arm720_dcache_clean_area)
	ENTRY(cpu_arm720_proc_init)
	mov pc, lr

	ENTRY(cpu_arm720_proc_fin)
	stmfd sp!, {lr}
	mov ip, #PSR_F_BIT \| PSR_I_BIT \| SVC_MODE
	msr cpsr_c, ip
	mrc p15, 0, r0, c1, c0, 0
	bic r0, r0, #0x1000 @ ...i............
	bic r0, r0, #0x000e @ ............wca.
	mcr p15, 0, r0, c1, c0, 0 @ disable caches
	mcr p15, 0, r1, c7, c7, 0 @ invalidate cache
	ldmfd sp!, {pc}

	/*
	* Function: arm720_proc_do_idle(void)
	* Params : r0 = unused
	* Purpose : put the processer in proper idle mode
	*/
	ENTRY(cpu_arm720_do_idle)
	mov pc, lr

	/*
	* Function: arm720_switch_mm(unsigned long pgd_phys)
	* Params : pgd_phys Physical address of page table
	* Purpose : Perform a task switch, saving the old process' state and restoring
	* the new.
	*/
	ENTRY(cpu_arm720_switch_mm)
	#ifdef CONFIG_MMU
	mov r1, #0
	mcr p15, 0, r1, c7, c7, 0 @ invalidate cache
	mcr p15, 0, r0, c2, c0, 0 @ update page table ptr
	mcr p15, 0, r1, c8, c7, 0 @ flush TLB (v4)
	#endif
	mov pc, lr

	/*
	* Function: arm720_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext)
	* Params : r0 = Address to set
	* : r1 = value to set
	* Purpose : Set a PTE and flush it out of any WB cache
	*/
	.align 5
	ENTRY(cpu_arm720_set_pte_ext)
	#ifdef CONFIG_MMU
	armv3_set_pte_ext wc_disable=0
	#endif
	mov pc, lr

	/*
	* Function: arm720_reset
	* Params : r0 = address to jump to
	* Notes : This sets up everything for a reset
	*/
	ENTRY(cpu_arm720_reset)
	mov ip, #0
	mcr p15, 0, ip, c7, c7, 0 @ invalidate cache
	#ifdef CONFIG_MMU
	mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4)
	#endif
	mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
	bic ip, ip, #0x000f @ ............wcam
	bic ip, ip, #0x2100 @ ..v....s........
	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	mov pc, r0

	__INIT

	.type __arm710_setup, #function
	__arm710_setup:
	mov r0, #0
	mcr p15, 0, r0, c7, c7, 0 @ invalidate caches
	#ifdef CONFIG_MMU
	mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4)
	#endif
	mrc p15, 0, r0, c1, c0 @ get control register
	ldr r5, arm710_cr1_clear
	bic r0, r0, r5
	ldr r5, arm710_cr1_set
	orr r0, r0, r5
	mov pc, lr @ __ret (head.S)
	.size __arm710_setup, . - __arm710_setup

	/*
	* R
	* .RVI ZFRS BLDP WCAM
	* .... 0001 ..11 1101
	*
	*/
	.type arm710_cr1_clear, #object
	.type arm710_cr1_set, #object
	arm710_cr1_clear:
	.word 0x0f3f
	arm710_cr1_set:
	.word 0x013d

	.type __arm720_setup, #function
	__arm720_setup:
	mov r0, #0
	mcr p15, 0, r0, c7, c7, 0 @ invalidate caches
	#ifdef CONFIG_MMU
	mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4)
	#endif
	adr r5, arm720_crval
	ldmia r5, {r5, r6}
	mrc p15, 0, r0, c1, c0 @ get control register
	bic r0, r0, r5
	orr r0, r0, r6
	mov pc, lr @ __ret (head.S)
	.size __arm720_setup, . - __arm720_setup

	/*
	* R
	* .RVI ZFRS BLDP WCAM
	* ..1. 1001 ..11 1101
	*
	*/
	.type arm720_crval, #object
	arm720_crval:
	crval clear=0x00002f3f, mmuset=0x0000213d, ucset=0x00000130

	__INITDATA

	/*
	* Purpose : Function pointers used to access above functions - all calls
	* come through these
	*/
	.type arm720_processor_functions, #object
	ENTRY(arm720_processor_functions)
	.word v4t_late_abort
	.word legacy_pabort
	.word cpu_arm720_proc_init
	.word cpu_arm720_proc_fin
	.word cpu_arm720_reset
	.word cpu_arm720_do_idle
	.word cpu_arm720_dcache_clean_area
	.word cpu_arm720_switch_mm
	.word cpu_arm720_set_pte_ext
	.size arm720_processor_functions, . - arm720_processor_functions

	.section ".rodata"

	.type cpu_arch_name, #object
	cpu_arch_name: .asciz "armv4t"
	.size cpu_arch_name, . - cpu_arch_name

	.type cpu_elf_name, #object
	cpu_elf_name: .asciz "v4"
	.size cpu_elf_name, . - cpu_elf_name

	.type cpu_arm710_name, #object
	cpu_arm710_name:
	.asciz "ARM710T"
	.size cpu_arm710_name, . - cpu_arm710_name

	.type cpu_arm720_name, #object
	cpu_arm720_name:
	.asciz "ARM720T"
	.size cpu_arm720_name, . - cpu_arm720_name

	.align

	/*
	* See <asm/procinfo.h> for a definition of this structure.
	*/

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

	.type __arm710_proc_info, #object
	__arm710_proc_info:
	.long 0x41807100 @ cpu_val
	.long 0xffffff00 @ cpu_mask
	.long PMD_TYPE_SECT \| \
	PMD_SECT_BUFFERABLE \| \
	PMD_SECT_CACHEABLE \| \
	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 __arm710_setup @ cpu_flush
	.long cpu_arch_name @ arch_name
	.long cpu_elf_name @ elf_name
	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_THUMB @ elf_hwcap
	.long cpu_arm710_name @ name
	.long arm720_processor_functions
	.long v4_tlb_fns
	.long v4wt_user_fns
	.long v4_cache_fns
	.size __arm710_proc_info, . - __arm710_proc_info

	.type __arm720_proc_info, #object
	__arm720_proc_info:
	.long 0x41807200 @ cpu_val
	.long 0xffffff00 @ cpu_mask
	.long PMD_TYPE_SECT \| \
	PMD_SECT_BUFFERABLE \| \
	PMD_SECT_CACHEABLE \| \
	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 __arm720_setup @ cpu_flush
	.long cpu_arch_name @ arch_name
	.long cpu_elf_name @ elf_name
	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_THUMB @ elf_hwcap
	.long cpu_arm720_name @ name
	.long arm720_processor_functions
	.long v4_tlb_fns
	.long v4wt_user_fns
	.long v4_cache_fns
	.size __arm720_proc_info, . - __arm720_proc_info