diff options
Diffstat (limited to 'arch/arm/mm/proc-v7-3level.S')
| -rw-r--r-- | arch/arm/mm/proc-v7-3level.S | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-v7-3level.S b/arch/arm/mm/proc-v7-3level.S new file mode 100644 index 000000000..131984462 --- /dev/null +++ b/arch/arm/mm/proc-v7-3level.S @@ -0,0 +1,148 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * arch/arm/mm/proc-v7-3level.S + * + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * Copyright (C) 2011 ARM Ltd. + * Author: Catalin Marinas <catalin.marinas@arm.com> + * based on arch/arm/mm/proc-v7-2level.S + */ +#include <asm/assembler.h> + +#define TTB_IRGN_NC (0 << 8) +#define TTB_IRGN_WBWA (1 << 8) +#define TTB_IRGN_WT (2 << 8) +#define TTB_IRGN_WB (3 << 8) +#define TTB_RGN_NC (0 << 10) +#define TTB_RGN_OC_WBWA (1 << 10) +#define TTB_RGN_OC_WT (2 << 10) +#define TTB_RGN_OC_WB (3 << 10) +#define TTB_S (3 << 12) +#define TTB_EAE (1 << 31) + +/* 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_RGN_OC_WBWA) +#define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S) + +#ifndef __ARMEB__ +# define rpgdl r0 +# define rpgdh r1 +#else +# define rpgdl r1 +# define rpgdh r0 +#endif + +/* + * cpu_v7_switch_mm(pgd_phys, tsk) + * + * Set the translation table base pointer to be pgd_phys (physical address of + * the new TTB). + */ +ENTRY(cpu_v7_switch_mm) +#ifdef CONFIG_MMU + mmid r2, r2 + asid r2, r2 + orr rpgdh, rpgdh, r2, lsl #(48 - 32) @ upper 32-bits of pgd + mcrr p15, 0, rpgdl, rpgdh, c2 @ set TTB 0 + isb +#endif + ret lr +ENDPROC(cpu_v7_switch_mm) + +#ifdef __ARMEB__ +#define rl r3 +#define rh r2 +#else +#define rl r2 +#define rh r3 +#endif + +/* + * cpu_v7_set_pte_ext(ptep, pte) + * + * Set a level 2 translation table entry. + * - ptep - pointer to level 3 translation table entry + * - pte - PTE value to store (64-bit in r2 and r3) + */ +ENTRY(cpu_v7_set_pte_ext) +#ifdef CONFIG_MMU + tst rl, #L_PTE_VALID + beq 1f + tst rh, #1 << (57 - 32) @ L_PTE_NONE + bicne rl, #L_PTE_VALID + bne 1f + + eor ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to + @ test for !L_PTE_DIRTY || L_PTE_RDONLY + tst ip, #1 << (55 - 32) | 1 << (58 - 32) + orrne rl, #PTE_AP2 + biceq rl, #PTE_AP2 + +1: strd r2, r3, [r0] + ALT_SMP(W(nop)) + ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte +#endif + ret lr +ENDPROC(cpu_v7_set_pte_ext) + + /* + * Memory region attributes for LPAE (defined in pgtable-3level.h): + * + * n = AttrIndx[2:0] + * + * n MAIR + * UNCACHED 000 00000000 + * BUFFERABLE 001 01000100 + * DEV_WC 001 01000100 + * WRITETHROUGH 010 10101010 + * WRITEBACK 011 11101110 + * DEV_CACHED 011 11101110 + * DEV_SHARED 100 00000100 + * DEV_NONSHARED 100 00000100 + * unused 101 + * unused 110 + * WRITEALLOC 111 11111111 + */ +.equ PRRR, 0xeeaa4400 @ MAIR0 +.equ NMRR, 0xff000004 @ MAIR1 + + /* + * Macro for setting up the TTBRx and TTBCR registers. + * - \ttbr1 updated. + */ + .macro v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp + ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address + cmp \ttbr1, \tmp, lsr #12 @ PHYS_OFFSET > PAGE_OFFSET? + mov \tmp, #TTB_EAE @ for TTB control egister + ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP) + ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP) + ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16) + ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16) + /* + * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above), + * otherwise booting secondary CPUs would end up using TTBR1 for the + * identity mapping set up in TTBR0. + */ + orrls \tmp, \tmp, #TTBR1_SIZE @ TTBCR.T1SZ + mcr p15, 0, \tmp, c2, c0, 2 @ TTBCR + mov \tmp, \ttbr1, lsr #20 + mov \ttbr1, \ttbr1, lsl #12 + addls \ttbr1, \ttbr1, #TTBR1_OFFSET + mcrr p15, 1, \ttbr1, \tmp, c2 @ load TTBR1 + .endm + + /* + * AT + * TFR EV X F IHD LR S + * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM + * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced + * 11 0 110 0 0011 1100 .111 1101 < we want + */ + .align 2 + .type v7_crval, #object +v7_crval: + crval clear=0x0122c302, mmuset=0x30c03c7d, ucset=0x00c01c7c |