/* * linux/arch/arm/mm/proc-v7.S * * Copyright (C) 2001 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 version 2 as * published by the Free Software Foundation. * * This is the "shell" of the ARMv7 processor support. */ #include #include #include #include #include #include #include #include "proc-macros.S" #define TTB_S (1 << 1) #define TTB_RGN_NC (0 << 3) #define TTB_RGN_OC_WBWA (1 << 3) #define TTB_RGN_OC_WT (2 << 3) #define TTB_RGN_OC_WB (3 << 3) #define TTB_NOS (1 << 5) #define TTB_IRGN_NC ((0 << 0) | (0 << 6)) #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6)) #define TTB_IRGN_WT ((1 << 0) | (0 << 6)) #define TTB_IRGN_WB ((1 << 0) | (1 << 6)) #ifndef CONFIG_SMP /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ #define TTB_FLAGS TTB_IRGN_WB|TTB_RGN_OC_WB #define PMD_FLAGS PMD_SECT_WB #else /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ #define TTB_FLAGS TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA #define PMD_FLAGS PMD_SECT_WBWA|PMD_SECT_S #endif ENTRY(cpu_v7_proc_init) mov pc, lr ENDPROC(cpu_v7_proc_init) ENTRY(cpu_v7_proc_fin) mov pc, lr ENDPROC(cpu_v7_proc_fin) /* * cpu_v7_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 * * It is assumed that: */ .align 5 ENTRY(cpu_v7_reset) mov pc, r0 ENDPROC(cpu_v7_reset) /* * cpu_v7_do_idle() * * Idle the processor (eg, wait for interrupt). * * IRQs are already disabled. */ ENTRY(cpu_v7_do_idle) dsb @ WFI may enter a low-power mode wfi mov pc, lr ENDPROC(cpu_v7_do_idle) ENTRY(cpu_v7_dcache_clean_area) #ifndef TLB_CAN_READ_FROM_L1_CACHE dcache_line_size r2, r3 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry add r0, r0, r2 subs r1, r1, r2 bhi 1b dsb #endif mov pc, lr ENDPROC(cpu_v7_dcache_clean_area) /* * cpu_v7_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_v7_switch_mm) #ifdef CONFIG_MMU mov r2, #0 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id orr r0, r0, #TTB_FLAGS #ifdef CONFIG_ARM_ERRATA_430973 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB #endif mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID isb 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 isb mcr p15, 0, r1, c13, c0, 1 @ set context ID isb #endif mov pc, lr ENDPROC(cpu_v7_switch_mm) /* * cpu_v7_set_pte_ext(ptep, pte) * * 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 */ ENTRY(cpu_v7_set_pte_ext) #ifdef CONFIG_MMU ARM( str r1, [r0], #-2048 ) @ linux version THUMB( str r1, [r0] ) @ linux version THUMB( sub r0, r0, #2048 ) bic r3, r1, #0x000003f0 bic r3, r3, #PTE_TYPE_MASK orr r3, r3, r2 orr r3, r3, #PTE_EXT_AP0 | 2 tst r1, #1 << 4 orrne r3, r3, #PTE_EXT_TEX(1) tst r1, #L_PTE_WRITE tstne r1, #L_PTE_DIRTY orreq r3, r3, #PTE_EXT_APX tst r1, #L_PTE_USER orrne r3, r3, #PTE_EXT_AP1 tstne r3, #PTE_EXT_APX bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 tst r1, #L_PTE_EXEC orreq r3, r3, #PTE_EXT_XN tst r1, #L_PTE_YOUNG tstne r1, #L_PTE_PRESENT moveq r3, #0 str r3, [r0] mcr p15, 0, r0, c7, c10, 1 @ flush_pte #endif mov pc, lr ENDPROC(cpu_v7_set_pte_ext) cpu_v7_name: .ascii "ARMv7 Processor" .align __INIT /* * __v7_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 ARMv7 cores. * * It is assumed that: * - cache type register is implemented */ __v7_setup: #ifdef CONFIG_SMP mrc p15, 0, r0, c1, c0, 1 tst r0, #(1 << 6) @ SMP/nAMP mode enabled? orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting #endif adr r12, __v7_setup_stack @ the local stack stmia r12, {r0-r5, r7, r9, r11, lr} bl v7_flush_dcache_all ldmia r12, {r0-r5, r7, r9, r11, lr} mrc p15, 0, r0, c0, c0, 0 @ read main ID register and r10, r0, #0xff000000 @ ARM? teq r10, #0x41000000 bne 2f and r5, r0, #0x00f00000 @ variant and r6, r0, #0x0000000f @ revision orr r0, r6, r5, lsr #20-4 @ combine variant and revision #ifdef CONFIG_ARM_ERRATA_430973 teq r5, #0x00100000 @ only present in r1p* mrceq p15, 0, r10, c1, c0, 1 @ read aux control register orreq r10, r10, #(1 << 6) @ set IBE to 1 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register #endif #ifdef CONFIG_ARM_ERRATA_458693 teq r0, #0x20 @ only present in r2p0 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register orreq r10, r10, #(1 << 5) @ set L1NEON to 1 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register #endif #ifdef CONFIG_ARM_ERRATA_460075 teq r0, #0x20 @ only present in r2p0 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register tsteq r10, #1 << 22 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register #endif 2: mov r10, #0 #ifdef HARVARD_CACHE mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate #endif dsb #ifdef CONFIG_MMU mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs mcr p15, 0, r10, c2, c0, 2 @ TTB control register orr r4, r4, #TTB_FLAGS mcr p15, 0, r4, c2, c0, 1 @ load TTB1 /* * Memory region attributes with SCTLR.TRE=1 * * n = TEX[0],C,B * TR = PRRR[2n+1:2n] - memory type * IR = NMRR[2n+1:2n] - inner cacheable property * OR = NMRR[2n+17:2n+16] - outer cacheable property * * n TR IR OR * UNCACHED 000 00 * BUFFERABLE 001 10 00 00 * WRITETHROUGH 010 10 10 10 * WRITEBACK 011 10 11 11 * reserved 110 * WRITEALLOC 111 10 01 01 * DEV_SHARED 100 01 * DEV_NONSHARED 100 01 * DEV_WC 001 10 * DEV_CACHED 011 10 * * Other attributes: * * DS0 = PRRR[16] = 0 - device shareable property * DS1 = PRRR[17] = 1 - device shareable property * NS0 = PRRR[18] = 0 - normal shareable property * NS1 = PRRR[19] = 1 - normal shareable property * NOS = PRRR[24+n] = 1 - not outer shareable */ ldr r5, =0xff0a81a8 @ PRRR ldr r6, =0x40e040e0 @ NMRR mcr p15, 0, r5, c10, c2, 0 @ write PRRR mcr p15, 0, r6, c10, c2, 1 @ write NMRR #endif adr r5, v7_crval ldmia r5, {r5, r6} #ifdef CONFIG_CPU_ENDIAN_BE8 orr r6, r6, #1 << 25 @ big-endian page tables #endif mrc p15, 0, r0, c1, c0, 0 @ read control register bic r0, r0, r5 @ clear bits them orr r0, r0, r6 @ set them THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions mov pc, lr @ return to head.S:__ret ENDPROC(__v7_setup) /* AT * TFR EV X F I D LR S * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced * 1 0 110 0011 1100 .111 1101 < we want */ .type v7_crval, #object v7_crval: crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c __v7_setup_stack: .space 4 * 11 @ 11 registers .type v7_processor_functions, #object ENTRY(v7_processor_functions) .word v7_early_abort .word v7_pabort .word cpu_v7_proc_init .word cpu_v7_proc_fin .word cpu_v7_reset .word cpu_v7_do_idle .word cpu_v7_dcache_clean_area .word cpu_v7_switch_mm .word cpu_v7_set_pte_ext .size v7_processor_functions, . - v7_processor_functions .type cpu_arch_name, #object cpu_arch_name: .asciz "armv7" .size cpu_arch_name, . - cpu_arch_name .type cpu_elf_name, #object cpu_elf_name: .asciz "v7" .size cpu_elf_name, . - cpu_elf_name .align .section ".proc.info.init", #alloc, #execinstr /* * Match any ARMv7 processor core. */ .type __v7_proc_info, #object __v7_proc_info: .long 0x000f0000 @ Required ID value .long 0x000f0000 @ Mask for ID .long PMD_TYPE_SECT | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ | \ PMD_FLAGS .long PMD_TYPE_SECT | \ PMD_SECT_XN | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ b __v7_setup .long cpu_arch_name .long cpu_elf_name .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP .long cpu_v7_name .long v7_processor_functions .long v7wbi_tlb_fns .long v6_user_fns .long v7_cache_fns .size __v7_proc_info, . - __v7_proc_info