blob: 07e7be1ec22cfadc2b8b233223e0ec501c9fdc23 [file] [log] [blame]
/*
* Copyright (c) 2018, 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>
.global enable_mmu_direct_el1
.global enable_mmu_direct_el2
.global enable_mmu_direct_el3
/* Macros to read and write to system register for a given EL. */
.macro _msr reg_name, el, gp_reg
msr \reg_name\()_el\()\el, \gp_reg
.endm
.macro _mrs gp_reg, reg_name, el
mrs \gp_reg, \reg_name\()_el\()\el
.endm
.macro tlbi_invalidate_all el
.if \el == 1
TLB_INVALIDATE(vmalle1)
.elseif \el == 2
TLB_INVALIDATE(alle2)
.elseif \el == 3
TLB_INVALIDATE(alle3)
.else
.error "EL must be 1, 2 or 3"
.endif
.endm
/* void enable_mmu_direct_el<x>(unsigned int flags) */
.macro define_mmu_enable_func el
func enable_mmu_direct_\()el\el
#if ENABLE_ASSERTIONS
_mrs x1, sctlr, \el
tst x1, #SCTLR_M_BIT
ASM_ASSERT(eq)
#endif
/* Invalidate all TLB entries */
tlbi_invalidate_all \el
mov x7, x0
adrp x0, mmu_cfg_params
add x0, x0, :lo12:mmu_cfg_params
/* MAIR */
ldr x1, [x0, #(MMU_CFG_MAIR << 3)]
_msr mair, \el, x1
/* TCR */
ldr x2, [x0, #(MMU_CFG_TCR << 3)]
_msr tcr, \el, x2
/* TTBR */
ldr x3, [x0, #(MMU_CFG_TTBR0 << 3)]
_msr ttbr0, \el, x3
/*
* 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, \el
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, \el, x4
isb
ret
endfunc enable_mmu_direct_\()el\el
.endm
/*
* Define MMU-enabling functions for EL1 and EL3:
*
* enable_mmu_direct_el1
* enable_mmu_direct_el3
*/
define_mmu_enable_func 1
define_mmu_enable_func 2
define_mmu_enable_func 3