268 lines
7.1 KiB
ArmAsm
268 lines
7.1 KiB
ArmAsm
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/*
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* linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
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*
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* Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
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* Rob Scott (rscott@mtrob.fdns.net)
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* Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* These are the low level assembler for performing cache and TLB
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* functions on the ARM720T. The ARM720T has a writethrough IDC
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* cache, so we don't need to clean it.
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*
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* Changelog:
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* 05-09-2000 SJH Created by moving 720 specific functions
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* out of 'proc-arm6,7.S' per RMK discussion
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* 07-25-2000 SJH Added idle function.
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* 08-25-2000 DBS Updated for integration of ARM Ltd version.
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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/assembler.h>
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#include <asm/constants.h>
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#include <asm/pgtable.h>
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#include <asm/procinfo.h>
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#include <asm/ptrace.h>
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#include <asm/hardware.h>
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/*
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* Function: arm720_proc_init (void)
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* : arm720_proc_fin (void)
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*
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* Notes : This processor does not require these
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*/
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ENTRY(cpu_arm720_dcache_clean_area)
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ENTRY(cpu_arm720_proc_init)
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mov pc, lr
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ENTRY(cpu_arm720_proc_fin)
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stmfd sp!, {lr}
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mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
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msr cpsr_c, ip
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #0x1000 @ ...i............
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bic r0, r0, #0x000e @ ............wca.
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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mcr p15, 0, r1, c7, c7, 0 @ invalidate cache
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ldmfd sp!, {pc}
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/*
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* Function: arm720_proc_do_idle(void)
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* Params : r0 = unused
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* Purpose : put the processer in proper idle mode
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*/
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ENTRY(cpu_arm720_do_idle)
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mov pc, lr
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/*
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* Function: arm720_switch_mm(unsigned long pgd_phys)
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* Params : pgd_phys Physical address of page table
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* Purpose : Perform a task switch, saving the old process' state and restoring
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* the new.
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*/
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ENTRY(cpu_arm720_switch_mm)
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mov r1, #0
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mcr p15, 0, r1, c7, c7, 0 @ invalidate cache
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mcr p15, 0, r0, c2, c0, 0 @ update page table ptr
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mcr p15, 0, r1, c8, c7, 0 @ flush TLB (v4)
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mov pc, lr
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/*
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* Function: arm720_set_pte(pte_t *ptep, pte_t pte)
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* Params : r0 = Address to set
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* : r1 = value to set
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* Purpose : Set a PTE and flush it out of any WB cache
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*/
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.align 5
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ENTRY(cpu_arm720_set_pte)
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str r1, [r0], #-2048 @ linux version
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eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
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bic r2, r1, #PTE_SMALL_AP_MASK
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bic r2, r2, #PTE_TYPE_MASK
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orr r2, r2, #PTE_TYPE_SMALL
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tst r1, #L_PTE_USER @ User?
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orrne r2, r2, #PTE_SMALL_AP_URO_SRW
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tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
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orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
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tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young
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movne r2, #0
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str r2, [r0] @ hardware version
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mov pc, lr
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/*
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* Function: arm720_reset
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* Params : r0 = address to jump to
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* Notes : This sets up everything for a reset
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*/
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ENTRY(cpu_arm720_reset)
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate cache
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mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4)
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mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
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bic ip, ip, #0x000f @ ............wcam
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bic ip, ip, #0x2100 @ ..v....s........
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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mov pc, r0
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__INIT
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.type __arm710_setup, #function
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__arm710_setup:
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 @ invalidate caches
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mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4)
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mrc p15, 0, r0, c1, c0 @ get control register
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ldr r5, arm710_cr1_clear
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bic r0, r0, r5
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ldr r5, arm710_cr1_set
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orr r0, r0, r5
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mov pc, lr @ __ret (head.S)
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.size __arm710_setup, . - __arm710_setup
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/*
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* R
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* .RVI ZFRS BLDP WCAM
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* .... 0001 ..11 1101
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*
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*/
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.type arm710_cr1_clear, #object
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.type arm710_cr1_set, #object
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arm710_cr1_clear:
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.word 0x0f3f
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arm710_cr1_set:
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.word 0x013d
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.type __arm720_setup, #function
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__arm720_setup:
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 @ invalidate caches
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mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4)
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mrc p15, 0, r0, c1, c0 @ get control register
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ldr r5, arm720_cr1_clear
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bic r0, r0, r5
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ldr r5, arm720_cr1_set
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orr r0, r0, r5
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mov pc, lr @ __ret (head.S)
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.size __arm720_setup, . - __arm720_setup
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/*
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* R
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* .RVI ZFRS BLDP WCAM
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* ..1. 1001 ..11 1101
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*
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*/
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.type arm720_cr1_clear, #object
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.type arm720_cr1_set, #object
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arm720_cr1_clear:
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.word 0x2f3f
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arm720_cr1_set:
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.word 0x213d
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__INITDATA
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/*
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* Purpose : Function pointers used to access above functions - all calls
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* come through these
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*/
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.type arm720_processor_functions, #object
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ENTRY(arm720_processor_functions)
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.word v4t_late_abort
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.word cpu_arm720_proc_init
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.word cpu_arm720_proc_fin
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.word cpu_arm720_reset
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.word cpu_arm720_do_idle
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.word cpu_arm720_dcache_clean_area
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.word cpu_arm720_switch_mm
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.word cpu_arm720_set_pte
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.size arm720_processor_functions, . - arm720_processor_functions
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.section ".rodata"
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.type cpu_arch_name, #object
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cpu_arch_name: .asciz "armv4t"
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.size cpu_arch_name, . - cpu_arch_name
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.type cpu_elf_name, #object
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cpu_elf_name: .asciz "v4"
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.size cpu_elf_name, . - cpu_elf_name
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.type cpu_arm710_name, #object
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cpu_arm710_name:
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.asciz "ARM710T"
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.size cpu_arm710_name, . - cpu_arm710_name
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.type cpu_arm720_name, #object
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cpu_arm720_name:
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.asciz "ARM720T"
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.size cpu_arm720_name, . - cpu_arm720_name
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.align
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/*
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* See linux/include/asm-arm/procinfo.h for a definition of this structure.
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*/
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.section ".proc.info", #alloc, #execinstr
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.type __arm710_proc_info, #object
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__arm710_proc_info:
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.long 0x41807100 @ cpu_val
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.long 0xffffff00 @ cpu_mask
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.long PMD_TYPE_SECT | \
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PMD_SECT_BUFFERABLE | \
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PMD_SECT_CACHEABLE | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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b __arm710_setup @ cpu_flush
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.long cpu_arch_name @ arch_name
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.long cpu_elf_name @ elf_name
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB @ elf_hwcap
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.long cpu_arm710_name @ name
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.long arm720_processor_functions
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.long v4_tlb_fns
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.long v4wt_user_fns
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.long v4_cache_fns
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.size __arm710_proc_info, . - __arm710_proc_info
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.type __arm720_proc_info, #object
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__arm720_proc_info:
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.long 0x41807200 @ cpu_val
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.long 0xffffff00 @ cpu_mask
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.long PMD_TYPE_SECT | \
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PMD_SECT_BUFFERABLE | \
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PMD_SECT_CACHEABLE | \
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PMD_BIT4 | \
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PMD_SECT_AP_WRITE | \
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PMD_SECT_AP_READ
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b __arm720_setup @ cpu_flush
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.long cpu_arch_name @ arch_name
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.long cpu_elf_name @ elf_name
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB @ elf_hwcap
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.long cpu_arm720_name @ name
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.long arm720_processor_functions
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.long v4_tlb_fns
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.long v4wt_user_fns
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.long v4_cache_fns
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.size __arm720_proc_info, . - __arm720_proc_info
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