/* * linux/arch/arm/mm/proc-v6.S * * Copyright (C) 2001 Deep Blue Solutions Ltd. * Modified by Catalin Marinas for noMMU support * * 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. * * This is the "shell" of the ARMv6 processor support. */ #include #include #include #include #include #include #include #include "proc-macros.S" #define D_CACHE_LINE_SIZE 32 #define TTB_C (1 << 0) #define TTB_S (1 << 1) #define TTB_IMP (1 << 2) #define TTB_RGN_NC (0 << 3) #define TTB_RGN_WBWA (1 << 3) #define TTB_RGN_WT (2 << 3) #define TTB_RGN_WB (3 << 3) #define TTB_FLAGS_UP TTB_RGN_WBWA #define PMD_FLAGS_UP PMD_SECT_WB #define TTB_FLAGS_SMP TTB_RGN_WBWA|TTB_S #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S ENTRY(cpu_v6_proc_init) ret lr ENTRY(cpu_v6_proc_fin) mrc p15, 0, r0, c1, c0, 0 @ ctrl register bic r0, r0, #0x1000 @ ...i............ bic r0, r0, #0x0006 @ .............ca. mcr p15, 0, r0, c1, c0, 0 @ disable caches ret lr /* * cpu_v6_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 .pushsection .idmap.text, "ax" ENTRY(cpu_v6_reset) mrc p15, 0, r1, c1, c0, 0 @ ctrl register bic r1, r1, #0x1 @ ...............m mcr p15, 0, r1, c1, c0, 0 @ disable MMU mov r1, #0 mcr p15, 0, r1, c7, c5, 4 @ ISB ret r0 ENDPROC(cpu_v6_reset) .popsection /* * cpu_v6_do_idle() * * Idle the processor (eg, wait for interrupt). * * IRQs are already disabled. */ ENTRY(cpu_v6_do_idle) mov r1, #0 mcr p15, 0, r1, c7, c10, 4 @ DWB - WFI may enter a low-power mode mcr p15, 0, r1, c7, c0, 4 @ wait for interrupt ret lr ENTRY(cpu_v6_dcache_clean_area) 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry add r0, r0, #D_CACHE_LINE_SIZE subs r1, r1, #D_CACHE_LINE_SIZE bhi 1b ret lr /* * cpu_v6_switch_mm(pgd_phys, tsk) * * Set the translation table base pointer to be pgd_phys * * - pgd_phys - physical address of new TTB * * It is assumed that: * - we are not using split page tables */ ENTRY(cpu_v6_switch_mm) #ifdef CONFIG_MMU mov r2, #0 mmid r1, r1 @ get mm->context.id ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP) ALT_UP(orr r0, r0, #TTB_FLAGS_UP) mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB mcr p15, 0, r2, c7, c10, 4 @ drain write buffer mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 #ifdef CONFIG_PID_IN_CONTEXTIDR mrc p15, 0, r2, c13, c0, 1 @ read current context ID bic r2, r2, #0xff @ extract the PID and r1, r1, #0xff orr r1, r1, r2 @ insert into new context ID #endif mcr p15, 0, r1, c13, c0, 1 @ set context ID #endif ret lr /* * cpu_v6_set_pte_ext(ptep, pte, ext) * * Set a level 2 translation table entry. * * - ptep - pointer to level 2 translation table entry * (hardware version is stored at -1024 bytes) * - pte - PTE value to store * - ext - value for extended PTE bits */ armv6_mt_table cpu_v6 ENTRY(cpu_v6_set_pte_ext) #ifdef CONFIG_MMU armv6_set_pte_ext cpu_v6 #endif ret lr /* Suspend/resume support: taken from arch/arm/mach-s3c64xx/sleep.S */ .globl cpu_v6_suspend_size .equ cpu_v6_suspend_size, 4 * 6 #ifdef CONFIG_ARM_CPU_SUSPEND ENTRY(cpu_v6_do_suspend) stmfd sp!, {r4 - r9, lr} mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID #ifdef CONFIG_MMU mrc p15, 0, r5, c3, c0, 0 @ Domain ID mrc p15, 0, r6, c2, c0, 1 @ Translation table base 1 #endif mrc p15, 0, r7, c1, c0, 1 @ auxiliary control register mrc p15, 0, r8, c1, c0, 2 @ co-processor access control mrc p15, 0, r9, c1, c0, 0 @ control register stmia r0, {r4 - r9} ldmfd sp!, {r4- r9, pc} ENDPROC(cpu_v6_do_suspend) ENTRY(cpu_v6_do_resume) mov ip, #0 mcr p15, 0, ip, c7, c14, 0 @ clean+invalidate D cache mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache mcr p15, 0, ip, c7, c15, 0 @ clean+invalidate cache mcr p15, 0, ip, c7, c10, 4 @ drain write buffer mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID ldmia r0, {r4 - r9} mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID #ifdef CONFIG_MMU mcr p15, 0, r5, c3, c0, 0 @ Domain ID ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP) ALT_UP(orr r1, r1, #TTB_FLAGS_UP) mcr p15, 0, r1, c2, c0, 0 @ Translation table base 0 mcr p15, 0, r6, c2, c0, 1 @ Translation table base 1 mcr p15, 0, ip, c2, c0, 2 @ TTB control register #endif mcr p15, 0, r7, c1, c0, 1 @ auxiliary control register mcr p15, 0, r8, c1, c0, 2 @ co-processor access control mcr p15, 0, ip, c7, c5, 4 @ ISB mov r0, r9 @ control register b cpu_resume_mmu ENDPROC(cpu_v6_do_resume) #endif string cpu_v6_name, "ARMv6-compatible processor" .align /* * __v6_setup * * Initialise TLB, Caches, and MMU state ready to switch the MMU * on. Return in r0 the new CP15 C1 control register setting. * * We automatically detect if we have a Harvard cache, and use the * Harvard cache control instructions insead of the unified cache * control instructions. * * This should be able to cover all ARMv6 cores. * * It is assumed that: * - cache type register is implemented */ __v6_setup: #ifdef CONFIG_SMP ALT_SMP(mrc p15, 0, r0, c1, c0, 1) @ Enable SMP/nAMP mode ALT_UP(nop) orr r0, r0, #0x20 ALT_SMP(mcr p15, 0, r0, c1, c0, 1) ALT_UP(nop) #endif mov r0, #0 mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache #ifdef CONFIG_MMU mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs mcr p15, 0, r0, c2, c0, 2 @ TTB control register ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP) ALT_UP(orr r4, r4, #TTB_FLAGS_UP) ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP) ALT_UP(orr r8, r8, #TTB_FLAGS_UP) mcr p15, 0, r8, c2, c0, 1 @ load TTB1 #endif /* CONFIG_MMU */ mcr p15, 0, r0, c7, c10, 4 @ drain write buffer and @ complete invalidations adr r5, v6_crval ldmia r5, {r5, r6} ARM_BE8(orr r6, r6, #1 << 25) @ big-endian page tables mrc p15, 0, r0, c1, c0, 0 @ read control register bic r0, r0, r5 @ clear bits them orr r0, r0, r6 @ set them #ifdef CONFIG_ARM_ERRATA_364296 /* * Workaround for the 364296 ARM1136 r0p2 erratum (possible cache data * corruption with hit-under-miss enabled). The conditional code below * (setting the undocumented bit 31 in the auxiliary control register * and the FI bit in the control register) disables hit-under-miss * without putting the processor into full low interrupt latency mode. */ ldr r6, =0x4107b362 @ id for ARM1136 r0p2 mrc p15, 0, r5, c0, c0, 0 @ get processor id teq r5, r6 @ check for the faulty core mrceq p15, 0, r5, c1, c0, 1 @ load aux control reg orreq r5, r5, #(1 << 31) @ set the undocumented bit 31 mcreq p15, 0, r5, c1, c0, 1 @ write aux control reg orreq r0, r0, #(1 << 21) @ low interrupt latency configuration #endif ret lr @ return to head.S:__ret /* * V X F I D LR * .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced * 0 110 0011 1.00 .111 1101 < we want */ .type v6_crval, #object v6_crval: crval clear=0x01e0fb7f, mmuset=0x00c0387d, ucset=0x00c0187c __INITDATA @ define struct processor (see and proc-macros.S) define_processor_functions v6, dabort=v6_early_abort, pabort=v6_pabort, suspend=1 .section ".rodata" string cpu_arch_name, "armv6" string cpu_elf_name, "v6" .align .section ".proc.info.init", #alloc /* * Match any ARMv6 processor core. */ .type __v6_proc_info, #object __v6_proc_info: .long 0x0007b000 .long 0x0007f000 ALT_SMP(.long \ PMD_TYPE_SECT | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ | \ PMD_FLAGS_SMP) ALT_UP(.long \ PMD_TYPE_SECT | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ | \ PMD_FLAGS_UP) .long PMD_TYPE_SECT | \ PMD_SECT_XN | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ initfn __v6_setup, __v6_proc_info .long cpu_arch_name .long cpu_elf_name /* See also feat_v6_fixup() for HWCAP_TLS */ .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA|HWCAP_TLS .long cpu_v6_name .long v6_processor_functions .long v6wbi_tlb_fns .long v6_user_fns .long v6_cache_fns .size __v6_proc_info, . - __v6_proc_info