/* * 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. * * 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. */ #include <linux/linkage.h> #include <linux/init.h> #include <asm/assembler.h> #include <asm/asm-offsets.h> #include <asm/pgtable.h> #include <asm/procinfo.h> #include <asm/ptrace.h> #include <asm/hardware.h> /* * 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) 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) mov pc, lr /* * Function: arm720_set_pte(pte_t *ptep, pte_t pte) * 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) str r1, [r0], #-2048 @ linux version eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY bic r2, r1, #PTE_SMALL_AP_MASK bic r2, r2, #PTE_TYPE_MASK orr r2, r2, #PTE_TYPE_SMALL tst r1, #L_PTE_USER @ User? orrne r2, r2, #PTE_SMALL_AP_URO_SRW tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty? orreq r2, r2, #PTE_SMALL_AP_UNO_SRW tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young movne r2, #0 str r2, [r0] @ hardware version 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 mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4) 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 mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4) 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 mcr p15, 0, r0, c8, c7, 0 @ flush TLB (v4) mrc p15, 0, r0, c1, c0 @ get control register ldr r5, arm720_cr1_clear bic r0, r0, r5 ldr r5, arm720_cr1_set orr r0, r0, r5 mov pc, lr @ __ret (head.S) .size __arm720_setup, . - __arm720_setup /* * R * .RVI ZFRS BLDP WCAM * ..1. 1001 ..11 1101 * */ .type arm720_cr1_clear, #object .type arm720_cr1_set, #object arm720_cr1_clear: .word 0x2f3f arm720_cr1_set: .word 0x213d __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 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 .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 linux/include/asm-arm/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 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 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