| /* |
| * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <asm_macros.S> |
| #include <assert_macros.S> |
| #include <lib/xlat_tables/xlat_tables_v2.h> |
| #include <platform_def.h> |
| |
| .global enable_mpu_direct_el2 |
| |
| /* void enable_mmu_direct_el2(unsigned int flags) */ |
| func enable_mpu_direct_el2 |
| #if ENABLE_ASSERTIONS |
| mrs x1, sctlr_el2 |
| tst x1, #SCTLR_M_BIT |
| ASM_ASSERT(eq) |
| #endif |
| mov x7, x0 |
| adrp x0, mmu_cfg_params |
| add x0, x0, :lo12:mmu_cfg_params |
| |
| /* (MAIRs are already set up) */ |
| |
| /* TCR */ |
| ldr x2, [x0, #(MMU_CFG_TCR << 3)] |
| msr tcr_el2, x2 |
| |
| /* |
| * Ensure all translation table writes have drained into memory, the TLB |
| * invalidation is complete, and translation register writes are |
| * committed before enabling the MMU |
| */ |
| dsb ish |
| isb |
| |
| /* Set and clear required fields of SCTLR */ |
| mrs x4, sctlr_el2 |
| mov_imm x5, SCTLR_WXN_BIT | SCTLR_C_BIT | SCTLR_M_BIT |
| orr x4, x4, x5 |
| |
| /* Additionally, amend SCTLR fields based on flags */ |
| bic x5, x4, #SCTLR_C_BIT |
| tst x7, #DISABLE_DCACHE |
| csel x4, x5, x4, ne |
| |
| msr sctlr_el2, x4 |
| isb |
| |
| ret |
| endfunc enable_mpu_direct_el2 |