| /* |
| * Based on arch/arm/mm/proc.S |
| * |
| * Copyright (C) 2001 Deep Blue Solutions Ltd. |
| * Copyright (C) 2012 ARM Ltd. |
| * Author: Catalin Marinas <catalin.marinas@arm.com> |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/hwcap.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable.h> |
| |
| #include "proc-macros.S" |
| |
| #ifdef CONFIG_ARM64_64K_PAGES |
| #define TCR_TG_FLAGS TCR_TG0_64K | TCR_TG1_64K |
| #else |
| #define TCR_TG_FLAGS TCR_TG0_4K | TCR_TG1_4K |
| #endif |
| |
| #ifdef CONFIG_SMP |
| #define TCR_SMP_FLAGS TCR_SHARED |
| #else |
| #define TCR_SMP_FLAGS 0 |
| #endif |
| |
| /* PTWs cacheable, inner/outer WBWA */ |
| #define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA |
| |
| #define MAIR(attr, mt) ((attr) << ((mt) * 8)) |
| |
| /* |
| * cpu_cache_off() |
| * |
| * Turn the CPU D-cache off. |
| */ |
| ENTRY(cpu_cache_off) |
| mrs x0, sctlr_el1 |
| bic x0, x0, #1 << 2 // clear SCTLR.C |
| msr sctlr_el1, x0 |
| isb |
| ret |
| ENDPROC(cpu_cache_off) |
| |
| /* |
| * cpu_reset(loc) |
| * |
| * Perform a soft reset of the system. Put the CPU into the same state |
| * as it would be if it had been reset, and branch to what would be the |
| * reset vector. It must be executed with the flat identity mapping. |
| * |
| * - loc - location to jump to for soft reset |
| */ |
| .align 5 |
| ENTRY(cpu_reset) |
| mrs x1, sctlr_el1 |
| bic x1, x1, #1 |
| msr sctlr_el1, x1 // disable the MMU |
| isb |
| ret x0 |
| ENDPROC(cpu_reset) |
| |
| /* |
| * cpu_do_idle() |
| * |
| * Idle the processor (wait for interrupt). |
| */ |
| ENTRY(cpu_do_idle) |
| dsb sy // WFI may enter a low-power mode |
| wfi |
| ret |
| ENDPROC(cpu_do_idle) |
| |
| #ifdef CONFIG_ARM64_CPU_SUSPEND |
| /** |
| * cpu_do_suspend - save CPU registers context |
| * |
| * x0: virtual address of context pointer |
| */ |
| ENTRY(cpu_do_suspend) |
| mrs x2, tpidr_el0 |
| mrs x3, tpidrro_el0 |
| mrs x4, contextidr_el1 |
| mrs x5, mair_el1 |
| mrs x6, cpacr_el1 |
| mrs x7, ttbr1_el1 |
| mrs x8, tcr_el1 |
| mrs x9, vbar_el1 |
| mrs x10, mdscr_el1 |
| mrs x11, oslsr_el1 |
| mrs x12, sctlr_el1 |
| stp x2, x3, [x0] |
| stp x4, x5, [x0, #16] |
| stp x6, x7, [x0, #32] |
| stp x8, x9, [x0, #48] |
| stp x10, x11, [x0, #64] |
| str x12, [x0, #80] |
| ret |
| ENDPROC(cpu_do_suspend) |
| |
| /** |
| * cpu_do_resume - restore CPU register context |
| * |
| * x0: Physical address of context pointer |
| * x1: ttbr0_el1 to be restored |
| * |
| * Returns: |
| * sctlr_el1 value in x0 |
| */ |
| ENTRY(cpu_do_resume) |
| /* |
| * Invalidate local tlb entries before turning on MMU |
| */ |
| tlbi vmalle1 |
| ldp x2, x3, [x0] |
| ldp x4, x5, [x0, #16] |
| ldp x6, x7, [x0, #32] |
| ldp x8, x9, [x0, #48] |
| ldp x10, x11, [x0, #64] |
| ldr x12, [x0, #80] |
| msr tpidr_el0, x2 |
| msr tpidrro_el0, x3 |
| msr contextidr_el1, x4 |
| msr mair_el1, x5 |
| msr cpacr_el1, x6 |
| msr ttbr0_el1, x1 |
| msr ttbr1_el1, x7 |
| msr tcr_el1, x8 |
| msr vbar_el1, x9 |
| msr mdscr_el1, x10 |
| /* |
| * Restore oslsr_el1 by writing oslar_el1 |
| */ |
| ubfx x11, x11, #1, #1 |
| msr oslar_el1, x11 |
| mov x0, x12 |
| dsb nsh // Make sure local tlb invalidation completed |
| isb |
| ret |
| ENDPROC(cpu_do_resume) |
| #endif |
| |
| /* |
| * cpu_do_switch_mm(pgd_phys, tsk) |
| * |
| * Set the translation table base pointer to be pgd_phys. |
| * |
| * - pgd_phys - physical address of new TTB |
| */ |
| ENTRY(cpu_do_switch_mm) |
| mmid w1, x1 // get mm->context.id |
| bfi x0, x1, #48, #16 // set the ASID |
| msr ttbr0_el1, x0 // set TTBR0 |
| isb |
| ret |
| ENDPROC(cpu_do_switch_mm) |
| |
| .section ".text.init", #alloc, #execinstr |
| |
| /* |
| * __cpu_setup |
| * |
| * Initialise the processor for turning the MMU on. Return in x0 the |
| * value of the SCTLR_EL1 register. |
| */ |
| ENTRY(__cpu_setup) |
| ic iallu // I+BTB cache invalidate |
| tlbi vmalle1is // invalidate I + D TLBs |
| dsb ish |
| |
| mov x0, #3 << 20 |
| msr cpacr_el1, x0 // Enable FP/ASIMD |
| msr mdscr_el1, xzr // Reset mdscr_el1 |
| /* |
| * Memory region attributes for LPAE: |
| * |
| * n = AttrIndx[2:0] |
| * n MAIR |
| * DEVICE_nGnRnE 000 00000000 |
| * DEVICE_nGnRE 001 00000100 |
| * DEVICE_GRE 010 00001100 |
| * NORMAL_NC 011 01000100 |
| * NORMAL 100 11111111 |
| */ |
| ldr x5, =MAIR(0x00, MT_DEVICE_nGnRnE) | \ |
| MAIR(0x04, MT_DEVICE_nGnRE) | \ |
| MAIR(0x0c, MT_DEVICE_GRE) | \ |
| MAIR(0x44, MT_NORMAL_NC) | \ |
| MAIR(0xff, MT_NORMAL) |
| msr mair_el1, x5 |
| /* |
| * Prepare SCTLR |
| */ |
| adr x5, crval |
| ldp w5, w6, [x5] |
| mrs x0, sctlr_el1 |
| bic x0, x0, x5 // clear bits |
| orr x0, x0, x6 // set bits |
| /* |
| * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for |
| * both user and kernel. |
| */ |
| ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \ |
| TCR_TG_FLAGS | TCR_ASID16 | TCR_TBI0 |
| /* |
| * Read the PARange bits from ID_AA64MMFR0_EL1 and set the IPS bits in |
| * TCR_EL1. |
| */ |
| mrs x9, ID_AA64MMFR0_EL1 |
| bfi x10, x9, #32, #3 |
| msr tcr_el1, x10 |
| ret // return to head.S |
| ENDPROC(__cpu_setup) |
| |
| /* |
| * n n T |
| * U E WT T UD US IHBS |
| * CE0 XWHW CZ ME TEEA S |
| * .... .IEE .... NEAI TE.I ..AD DEN0 ACAM |
| * 0011 0... 1101 ..0. ..0. 10.. .... .... < hardware reserved |
| * .... .1.. .... 01.1 11.1 ..01 0001 1101 < software settings |
| */ |
| .type crval, #object |
| crval: |
| |
| #ifdef CONFIG_ARM64_ICACHE_DISABLE |
| #define CR_IBIT 0 |
| #else |
| #define CR_IBIT 0x1000 |
| #endif |
| |
| #ifdef CONFIG_ARM64_DCACHE_DISABLE |
| #define CR_CBIT 0 |
| #else |
| #define CR_CBIT 0x4 |
| #endif |
| |
| .word 0x000802c2 // clear |
| .word 0x0405c039 | CR_IBIT | CR_CBIT // set |