1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/mm/proc-v7-2level.S 4 * 5 * Copyright (C) 2001 Deep Blue Solutions Ltd. 6 */ 7 8 #define TTB_S (1 << 1) 9 #define TTB_RGN_NC (0 << 3) 10 #define TTB_RGN_OC_WBWA (1 << 3) 11 #define TTB_RGN_OC_WT (2 << 3) 12 #define TTB_RGN_OC_WB (3 << 3) 13 #define TTB_NOS (1 << 5) 14 #define TTB_IRGN_NC ((0 << 0) | (0 << 6)) 15 #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6)) 16 #define TTB_IRGN_WT ((1 << 0) | (0 << 6)) 17 #define TTB_IRGN_WB ((1 << 0) | (1 << 6)) 18 19 /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ 20 #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB 21 #define PMD_FLAGS_UP PMD_SECT_WB 22 23 /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ 24 #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA 25 #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S 26 27 /* 28 * cpu_v7_switch_mm(pgd_phys, tsk) 29 * 30 * Set the translation table base pointer to be pgd_phys 31 * 32 * - pgd_phys - physical address of new TTB 33 * 34 * It is assumed that: 35 * - we are not using split page tables 36 * 37 * Note that we always need to flush BTAC/BTB if IBE is set 38 * even on Cortex-A8 revisions not affected by 430973. 39 * If IBE is not set, the flush BTAC/BTB won't do anything. 40 */ 41 ENTRY(cpu_v7_switch_mm) 42 #ifdef CONFIG_MMU 43 mmid r1, r1 @ 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_PID_IN_CONTEXTIDR 47 mrc p15, 0, r2, c13, c0, 1 @ read current context ID 48 lsr r2, r2, #8 @ extract the PID 49 bfi r1, r2, #8, #24 @ insert into new context ID 50 #endif 51 #ifdef CONFIG_ARM_ERRATA_754322 52 dsb 53 #endif 54 mcr p15, 0, r1, c13, c0, 1 @ set context ID 55 isb 56 mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 57 isb 58 #endif 59 bx lr 60 ENDPROC(cpu_v7_switch_mm) 61 62 /* 63 * cpu_v7_set_pte_ext(ptep, pte) 64 * 65 * Set a level 2 translation table entry. 66 * 67 * - ptep - pointer to level 2 translation table entry 68 * (hardware version is stored at +2048 bytes) 69 * - pte - PTE value to store 70 * - ext - value for extended PTE bits 71 */ 72 ENTRY(cpu_v7_set_pte_ext) 73 #ifdef CONFIG_MMU 74 str r1, [r0] @ linux version 75 76 bic r3, r1, #0x000003f0 77 bic r3, r3, #PTE_TYPE_MASK 78 orr r3, r3, r2 79 orr r3, r3, #PTE_EXT_AP0 | 2 80 81 tst r1, #1 << 4 82 orrne r3, r3, #PTE_EXT_TEX(1) 83 84 eor r1, r1, #L_PTE_DIRTY 85 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY 86 orrne r3, r3, #PTE_EXT_APX 87 88 tst r1, #L_PTE_USER 89 orrne r3, r3, #PTE_EXT_AP1 90 91 tst r1, #L_PTE_XN 92 orrne r3, r3, #PTE_EXT_XN 93 94 tst r1, #L_PTE_YOUNG 95 tstne r1, #L_PTE_VALID 96 eorne r1, r1, #L_PTE_NONE 97 tstne r1, #L_PTE_NONE 98 moveq r3, #0 99 100 ARM( str r3, [r0, #2048]! ) 101 THUMB( add r0, r0, #2048 ) 102 THUMB( str r3, [r0] ) 103 ALT_SMP(W(nop)) 104 ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte 105 #endif 106 bx lr 107 ENDPROC(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, ttbr0l, ttbr0h, ttbr1, tmp 145 mcr p15, 0, \zero, c2, c0, 2 @ TTB control register 146 ALT_SMP(orr \ttbr0l, \ttbr0l, #TTB_FLAGS_SMP) 147 ALT_UP(orr \ttbr0l, \ttbr0l, #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 /* AT 154 * TFR EV X F I D LR S 155 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM 156 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced 157 * 01 0 110 0011 1100 .111 1101 < we want 158 */ 159 .align 2 160 .type v7_crval, #object 161 v7_crval: 162 crval clear=0x2120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c 163