1/* 2 * arch/arm/mm/proc-v7-2level.S 3 * 4 * Copyright (C) 2001 Deep Blue Solutions Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#define TTB_S (1 << 1) 12#define TTB_RGN_NC (0 << 3) 13#define TTB_RGN_OC_WBWA (1 << 3) 14#define TTB_RGN_OC_WT (2 << 3) 15#define TTB_RGN_OC_WB (3 << 3) 16#define TTB_NOS (1 << 5) 17#define TTB_IRGN_NC ((0 << 0) | (0 << 6)) 18#define TTB_IRGN_WBWA ((0 << 0) | (1 << 6)) 19#define TTB_IRGN_WT ((1 << 0) | (0 << 6)) 20#define TTB_IRGN_WB ((1 << 0) | (1 << 6)) 21 22/* PTWs cacheable, inner WB not shareable, outer WB not shareable */ 23#define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB 24#define PMD_FLAGS_UP PMD_SECT_WB 25 26/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ 27#define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA 28#define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S 29 30/* 31 * cpu_v7_switch_mm(pgd_phys, tsk) 32 * 33 * Set the translation table base pointer to be pgd_phys 34 * 35 * - pgd_phys - physical address of new TTB 36 * 37 * It is assumed that: 38 * - we are not using split page tables 39 */ 40ENTRY(cpu_v7_switch_mm) 41#ifdef CONFIG_MMU 42 mov r2, #0 43 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id 44 ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP) 45 ALT_UP(orr r0, r0, #TTB_FLAGS_UP) 46#ifdef CONFIG_ARM_ERRATA_430973 47 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB 48#endif 49#ifdef CONFIG_ARM_ERRATA_754322 50 dsb 51#endif 52 mcr p15, 0, r1, c13, c0, 1 @ set context ID 53 isb 54 mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 55 isb 56#endif 57 mov pc, lr 58ENDPROC(cpu_v7_switch_mm) 59 60/* 61 * cpu_v7_set_pte_ext(ptep, pte) 62 * 63 * Set a level 2 translation table entry. 64 * 65 * - ptep - pointer to level 2 translation table entry 66 * (hardware version is stored at +2048 bytes) 67 * - pte - PTE value to store 68 * - ext - value for extended PTE bits 69 */ 70ENTRY(cpu_v7_set_pte_ext) 71#ifdef CONFIG_MMU 72 str r1, [r0] @ linux version 73 74 bic r3, r1, #0x000003f0 75 bic r3, r3, #PTE_TYPE_MASK 76 orr r3, r3, r2 77 orr r3, r3, #PTE_EXT_AP0 | 2 78 79 tst r1, #1 << 4 80 orrne r3, r3, #PTE_EXT_TEX(1) 81 82 eor r1, r1, #L_PTE_DIRTY 83 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY 84 orrne r3, r3, #PTE_EXT_APX 85 86 tst r1, #L_PTE_USER 87 orrne r3, r3, #PTE_EXT_AP1 88#ifdef CONFIG_CPU_USE_DOMAINS 89 @ allow kernel read/write access to read-only user pages 90 tstne r3, #PTE_EXT_APX 91 bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 92#endif 93 94 tst r1, #L_PTE_XN 95 orrne r3, r3, #PTE_EXT_XN 96 97 tst r1, #L_PTE_YOUNG 98 tstne r1, #L_PTE_PRESENT 99 moveq r3, #0 100 101 ARM( str r3, [r0, #2048]! ) 102 THUMB( add r0, r0, #2048 ) 103 THUMB( str r3, [r0] ) 104 mcr p15, 0, r0, c7, c10, 1 @ flush_pte 105#endif 106 mov pc, lr 107ENDPROC(cpu_v7_set_pte_ext) 108 109 /* 110 * Memory region attributes with SCTLR.TRE=1 111 * 112 * n = TEX[0],C,B 113 * TR = PRRR[2n+1:2n] - memory type 114 * IR = NMRR[2n+1:2n] - inner cacheable property 115 * OR = NMRR[2n+17:2n+16] - outer cacheable property 116 * 117 * n TR IR OR 118 * UNCACHED 000 00 119 * BUFFERABLE 001 10 00 00 120 * WRITETHROUGH 010 10 10 10 121 * WRITEBACK 011 10 11 11 122 * reserved 110 123 * WRITEALLOC 111 10 01 01 124 * DEV_SHARED 100 01 125 * DEV_NONSHARED 100 01 126 * DEV_WC 001 10 127 * DEV_CACHED 011 10 128 * 129 * Other attributes: 130 * 131 * DS0 = PRRR[16] = 0 - device shareable property 132 * DS1 = PRRR[17] = 1 - device shareable property 133 * NS0 = PRRR[18] = 0 - normal shareable property 134 * NS1 = PRRR[19] = 1 - normal shareable property 135 * NOS = PRRR[24+n] = 1 - not outer shareable 136 */ 137.equ PRRR, 0xff0a81a8 138.equ NMRR, 0x40e040e0 139 140 /* 141 * Macro for setting up the TTBRx and TTBCR registers. 142 * - \ttb0 and \ttb1 updated with the corresponding flags. 143 */ 144 .macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp 145 mcr p15, 0, \zero, c2, c0, 2 @ TTB control register 146 ALT_SMP(orr \ttbr0, \ttbr0, #TTB_FLAGS_SMP) 147 ALT_UP(orr \ttbr0, \ttbr0, #TTB_FLAGS_UP) 148 ALT_SMP(orr \ttbr1, \ttbr1, #TTB_FLAGS_SMP) 149 ALT_UP(orr \ttbr1, \ttbr1, #TTB_FLAGS_UP) 150 mcr p15, 0, \ttbr1, c2, c0, 1 @ load TTB1 151 .endm 152 153 __CPUINIT 154 155 /* AT 156 * TFR EV X F I D LR S 157 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM 158 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced 159 * 1 0 110 0011 1100 .111 1101 < we want 160 */ 161 .align 2 162 .type v7_crval, #object 163v7_crval: 164 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c 165 166 .previous 167