1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/mm/proc-v7-3level.S 4 * 5 * Copyright (C) 2001 Deep Blue Solutions Ltd. 6 * Copyright (C) 2011 ARM Ltd. 7 * Author: Catalin Marinas <catalin.marinas@arm.com> 8 * based on arch/arm/mm/proc-v7-2level.S 9 */ 10 #include <asm/assembler.h> 11 12 #define TTB_IRGN_NC (0 << 8) 13 #define TTB_IRGN_WBWA (1 << 8) 14 #define TTB_IRGN_WT (2 << 8) 15 #define TTB_IRGN_WB (3 << 8) 16 #define TTB_RGN_NC (0 << 10) 17 #define TTB_RGN_OC_WBWA (1 << 10) 18 #define TTB_RGN_OC_WT (2 << 10) 19 #define TTB_RGN_OC_WB (3 << 10) 20 #define TTB_S (3 << 12) 21 #define TTB_EAE (1 << 31) 22 23 /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ 24 #define TTB_FLAGS_UP (TTB_IRGN_WB|TTB_RGN_OC_WB) 25 #define PMD_FLAGS_UP (PMD_SECT_WB) 26 27 /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ 28 #define TTB_FLAGS_SMP (TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA) 29 #define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S) 30 31 #ifndef __ARMEB__ 32 # define rpgdl r0 33 # define rpgdh r1 34 #else 35 # define rpgdl r1 36 # define rpgdh r0 37 #endif 38 39 /* 40 * cpu_v7_switch_mm(pgd_phys, tsk) 41 * 42 * Set the translation table base pointer to be pgd_phys (physical address of 43 * the new TTB). 44 */ 45 ENTRY(cpu_v7_switch_mm) 46 #ifdef CONFIG_MMU 47 mmid r2, r2 48 asid r2, r2 49 orr rpgdh, rpgdh, r2, lsl #(48 - 32) @ upper 32-bits of pgd 50 mcrr p15, 0, rpgdl, rpgdh, c2 @ set TTB 0 51 isb 52 #endif 53 ret lr 54 ENDPROC(cpu_v7_switch_mm) 55 56 #ifdef __ARMEB__ 57 #define rl r3 58 #define rh r2 59 #else 60 #define rl r2 61 #define rh r3 62 #endif 63 64 /* 65 * cpu_v7_set_pte_ext(ptep, pte) 66 * 67 * Set a level 2 translation table entry. 68 * - ptep - pointer to level 3 translation table entry 69 * - pte - PTE value to store (64-bit in r2 and r3) 70 */ 71 ENTRY(cpu_v7_set_pte_ext) 72 #ifdef CONFIG_MMU 73 tst rl, #L_PTE_VALID 74 beq 1f 75 tst rh, #1 << (57 - 32) @ L_PTE_NONE 76 bicne rl, #L_PTE_VALID 77 bne 1f 78 79 eor ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to 80 @ test for !L_PTE_DIRTY || L_PTE_RDONLY 81 tst ip, #1 << (55 - 32) | 1 << (58 - 32) 82 orrne rl, #PTE_AP2 83 biceq rl, #PTE_AP2 84 85 1: strd r2, r3, [r0] 86 ALT_SMP(W(nop)) 87 ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte 88 #endif 89 ret lr 90 ENDPROC(cpu_v7_set_pte_ext) 91 92 /* 93 * Memory region attributes for LPAE (defined in pgtable-3level.h): 94 * 95 * n = AttrIndx[2:0] 96 * 97 * n MAIR 98 * UNCACHED 000 00000000 99 * BUFFERABLE 001 01000100 100 * DEV_WC 001 01000100 101 * WRITETHROUGH 010 10101010 102 * WRITEBACK 011 11101110 103 * DEV_CACHED 011 11101110 104 * DEV_SHARED 100 00000100 105 * DEV_NONSHARED 100 00000100 106 * unused 101 107 * unused 110 108 * WRITEALLOC 111 11111111 109 */ 110 .equ PRRR, 0xeeaa4400 @ MAIR0 111 .equ NMRR, 0xff000004 @ MAIR1 112 113 /* 114 * Macro for setting up the TTBRx and TTBCR registers. 115 * - \ttbr1 updated. 116 */ 117 .macro v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp 118 ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address 119 cmp \ttbr1, \tmp, lsr #12 @ PHYS_OFFSET > PAGE_OFFSET? 120 mov \tmp, #TTB_EAE @ for TTB control egister 121 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP) 122 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP) 123 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16) 124 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16) 125 /* 126 * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above), 127 * otherwise booting secondary CPUs would end up using TTBR1 for the 128 * identity mapping set up in TTBR0. 129 */ 130 orrls \tmp, \tmp, #TTBR1_SIZE @ TTBCR.T1SZ 131 mcr p15, 0, \tmp, c2, c0, 2 @ TTBCR 132 mov \tmp, \ttbr1, lsr #20 133 mov \ttbr1, \ttbr1, lsl #12 134 addls \ttbr1, \ttbr1, #TTBR1_OFFSET 135 mcrr p15, 1, \ttbr1, \tmp, c2 @ load TTBR1 136 .endm 137 138 /* 139 * AT 140 * TFR EV X F IHD LR S 141 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM 142 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced 143 * 11 0 110 0 0011 1100 .111 1101 < we want 144 */ 145 .align 2 146 .type v7_crval, #object 147 v7_crval: 148 crval clear=0x0122c302, mmuset=0x30c03c7d, ucset=0x00c01c7c 149