/* * linux/arch/arm/mm/proc-arm1022.S: MMU functions for ARM1022E * * Copyright (C) 2000 ARM Limited * Copyright (C) 2000 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. * * * These are the low level assembler for performing cache and TLB * functions on the ARM1022E. */ #include <linux/linkage.h> #include <linux/config.h> #include <linux/init.h> #include <asm/assembler.h> #include <asm/constants.h> #include <asm/pgtable.h> #include <asm/procinfo.h> #include <asm/ptrace.h> /* * 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 maintainence instructions. */ #define CACHE_DLIMIT 32768 .text /* * cpu_arm1022_proc_init() */ ENTRY(cpu_arm1022_proc_init) mov pc, lr /* * cpu_arm1022_proc_fin() */ ENTRY(cpu_arm1022_proc_fin) stmfd sp!, {lr} mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE msr cpsr_c, ip bl arm1022_flush_kern_cache_all 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 ldmfd sp!, {pc} /* * cpu_arm1022_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 ENTRY(cpu_arm1022_reset) mov ip, #0 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches mcr p15, 0, ip, c7, c10, 4 @ drain WB mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 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 mov pc, r0 /* * cpu_arm1022_do_idle() */ .align 5 ENTRY(cpu_arm1022_do_idle) mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt mov pc, lr /* ================================= CACHE ================================ */ .align 5 /* * flush_user_cache_all() * * Invalidate all cache entries in a particular address * space. */ ENTRY(arm1022_flush_user_cache_all) /* FALLTHROUGH */ /* * flush_kern_cache_all() * * Clean and invalidate the entire cache. */ ENTRY(arm1022_flush_kern_cache_all) mov r2, #VM_EXEC mov ip, #0 __flush_whole_cache: #ifndef CONFIG_CPU_DCACHE_DISABLE 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 mov pc, 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(arm1022_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 mov pc, 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(arm1022_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(arm1022_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 pc, lr /* * flush_kern_dcache_page(void *page) * * Ensure no D cache aliasing occurs, either with itself or * the I cache * * - page - page aligned address */ ENTRY(arm1022_flush_kern_dcache_page) mov ip, #0 #ifndef CONFIG_CPU_DCACHE_DISABLE add r1, r0, #PAGE_SZ 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 mov pc, 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) */ ENTRY(arm1022_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 mov pc, lr /* * dma_clean_range(start, end) * * Clean the specified virtual address range. * * - start - virtual start address * - end - virtual end address * * (same as v4wb) */ ENTRY(arm1022_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 mov pc, lr /* * dma_flush_range(start, end) * * Clean and invalidate the specified virtual address range. * * - start - virtual start address * - end - virtual end address */ ENTRY(arm1022_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 mov pc, lr ENTRY(arm1022_cache_fns) .long arm1022_flush_kern_cache_all .long arm1022_flush_user_cache_all .long arm1022_flush_user_cache_range .long arm1022_coherent_kern_range .long arm1022_coherent_user_range .long arm1022_flush_kern_dcache_page .long arm1022_dma_inv_range .long arm1022_dma_clean_range .long arm1022_dma_flush_range .align 5 ENTRY(cpu_arm1022_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 mov pc, lr /* =============================== PageTable ============================== */ /* * cpu_arm1022_switch_mm(pgd) * * Set the translation base pointer to be as described by pgd. * * pgd: new page tables */ .align 5 ENTRY(cpu_arm1022_switch_mm) #ifndef CONFIG_CPU_DCACHE_DISABLE 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 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 mov pc, lr /* * cpu_arm1022_set_pte(ptep, pte) * * Set a PTE and flush it out */ .align 5 ENTRY(cpu_arm1022_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 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH eor r3, r1, #0x0a @ C & small page? tst r3, #0x0b biceq r2, r2, #4 #endif str r2, [r0] @ hardware version mov r0, r0 #ifndef CONFIG_CPU_DCACHE_DISABLE mcr p15, 0, r0, c7, c10, 1 @ clean D entry #endif mov pc, lr __INIT .type __arm1022_setup, #function __arm1022_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 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 mrc p15, 0, r0, c1, c0 @ get control register v4 ldr r5, arm1022_cr1_clear bic r0, r0, r5 ldr r5, arm1022_cr1_set orr r0, r0, r5 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN orr r0, r0, #0x4000 @ .R.............. #endif mov pc, lr .size __arm1022_setup, . - __arm1022_setup /* * R * .RVI ZFRS BLDP WCAM * .011 1001 ..11 0101 * */ .type arm1022_cr1_clear, #object .type arm1022_cr1_set, #object arm1022_cr1_clear: .word 0x7f3f arm1022_cr1_set: .word 0x3935 __INITDATA /* * Purpose : Function pointers used to access above functions - all calls * come through these */ .type arm1022_processor_functions, #object arm1022_processor_functions: .word v4t_early_abort .word cpu_arm1022_proc_init .word cpu_arm1022_proc_fin .word cpu_arm1022_reset .word cpu_arm1022_do_idle .word cpu_arm1022_dcache_clean_area .word cpu_arm1022_switch_mm .word cpu_arm1022_set_pte .size arm1022_processor_functions, . - arm1022_processor_functions .section ".rodata" .type cpu_arch_name, #object cpu_arch_name: .asciz "armv5te" .size cpu_arch_name, . - cpu_arch_name .type cpu_elf_name, #object cpu_elf_name: .asciz "v5" .size cpu_elf_name, . - cpu_elf_name .type cpu_arm1022_name, #object cpu_arm1022_name: .ascii "arm1022" #ifndef CONFIG_CPU_ICACHE_DISABLE .ascii "i" #endif #ifndef CONFIG_CPU_DCACHE_DISABLE .ascii "d" #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH .ascii "(wt)" #else .ascii "(wb)" #endif #endif #ifndef CONFIG_CPU_BPREDICT_DISABLE .ascii "B" #endif #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN .ascii "RR" #endif .ascii "\0" .size cpu_arm1022_name, . - cpu_arm1022_name .align .section ".proc.info", #alloc, #execinstr .type __arm1022_proc_info,#object __arm1022_proc_info: .long 0x4105a220 @ ARM 1022E (v5TE) .long 0xff0ffff0 .long PMD_TYPE_SECT | \ PMD_BIT4 | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __arm1022_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP .long cpu_arm1022_name .long arm1022_processor_functions .long v4wbi_tlb_fns .long v4wb_user_fns .long arm1022_cache_fns .size __arm1022_proc_info, . - __arm1022_proc_info