| /* |
| * arch/arm/mm/proc-v7-2level.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. |
| */ |
| |
| #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)) |
| |
| /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ |
| #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB |
| #define PMD_FLAGS_UP PMD_SECT_WB |
| |
| /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ |
| #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA |
| #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S |
| |
| /* |
| * 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 |
| ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP) |
| ALT_UP(orr r0, r0, #TTB_FLAGS_UP) |
| #ifdef CONFIG_ARM_ERRATA_430973 |
| mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_754322 |
| dsb |
| #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 |
| #ifdef CONFIG_ARM_ERRATA_754322 |
| dsb |
| #endif |
| 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 +2048 bytes) |
| * - pte - PTE value to store |
| * - ext - value for extended PTE bits |
| */ |
| ENTRY(cpu_v7_set_pte_ext) |
| #ifdef CONFIG_MMU |
| str r1, [r0] @ linux version |
| |
| 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) |
| |
| eor r1, r1, #L_PTE_DIRTY |
| tst r1, #L_PTE_RDONLY | L_PTE_DIRTY |
| orrne r3, r3, #PTE_EXT_APX |
| |
| tst r1, #L_PTE_USER |
| orrne r3, r3, #PTE_EXT_AP1 |
| #ifdef CONFIG_CPU_USE_DOMAINS |
| @ allow kernel read/write access to read-only user pages |
| tstne r3, #PTE_EXT_APX |
| bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 |
| #endif |
| |
| tst r1, #L_PTE_XN |
| orrne r3, r3, #PTE_EXT_XN |
| |
| tst r1, #L_PTE_YOUNG |
| tstne r1, #L_PTE_PRESENT |
| moveq r3, #0 |
| |
| ARM( str r3, [r0, #2048]! ) |
| THUMB( add r0, r0, #2048 ) |
| THUMB( str r3, [r0] ) |
| mcr p15, 0, r0, c7, c10, 1 @ flush_pte |
| #endif |
| mov pc, lr |
| ENDPROC(cpu_v7_set_pte_ext) |
| |
| /* |
| * 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 |
| */ |
| .equ PRRR, 0xff0a81a8 |
| .equ NMRR, 0x40e040e0 |
| |
| /* |
| * Macro for setting up the TTBRx and TTBCR registers. |
| * - \ttb0 and \ttb1 updated with the corresponding flags. |
| */ |
| .macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp |
| mcr p15, 0, \zero, c2, c0, 2 @ TTB control register |
| ALT_SMP(orr \ttbr0, \ttbr0, #TTB_FLAGS_SMP) |
| ALT_UP(orr \ttbr0, \ttbr0, #TTB_FLAGS_UP) |
| ALT_SMP(orr \ttbr1, \ttbr1, #TTB_FLAGS_SMP) |
| ALT_UP(orr \ttbr1, \ttbr1, #TTB_FLAGS_UP) |
| mcr p15, 0, \ttbr1, c2, c0, 1 @ load TTB1 |
| .endm |
| |
| __CPUINIT |
| |
| /* 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 |
| */ |
| .align 2 |
| .type v7_crval, #object |
| v7_crval: |
| crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c |
| |
| .previous |