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https://github.com/Atmosphere-NX/Atmosphere.git
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105 lines
2.8 KiB
ArmAsm
105 lines
2.8 KiB
ArmAsm
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
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#define cpuactlr_el1 s3_1_c15_c2_0
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#define cpuectlr_el1 s3_1_c15_c2_1
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.macro RESET_CORE
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mov x0, #(1 << 63)
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msr cpuactlr_el1, x0 /* disable regional clock gating */
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isb
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mov x0, #3
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msr rmr_el3, x0
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isb
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dsb sy
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/* Nintendo forgot to copy-paste the branch instruction below. */
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1:
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wfi
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b 1b
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.endm
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.macro ERRATUM_INVALIDATE_BTB_AT_BOOT
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/* Nintendo copy-pasted https://github.com/ARM-software/arm-trusted-firmware/blob/master/plat/nvidia/tegra/common/aarch64/tegra_helpers.S#L312 */
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/*
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* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/* The following comments are mine. */
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/*
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Enable invalidates of branch target buffer, then flush
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the entire instruction cache at the local level, and
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with the reg change, the branch target buffer, then disable
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invalidates of the branch target buffer again.
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*/
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mrs x0, cpuactlr_el1
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orr x0, x0, #1
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msr cpuactlr_el1, x0
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dsb sy
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isb
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ic iallu
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dsb sy
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isb
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mrs x0, cpuactlr_el1
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bic x0, x0, #1
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msr cpuactlr_el1, x0
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.rept 7
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nop /* wait long enough for the write to cpuactlr_el1 to have completed */
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.endr
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/* if the OS lock is set, disable it and request a warm reset */
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mrs x0, oslsr_el1
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ands x0, x0, #2
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b.eq 2f
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mov x0, xzr
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msr oslar_el1, x0
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RESET_CORE
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.rept 65
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nop /* guard against speculative excecution */
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.endr
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2:
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/* set the OS lock */
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mov x0, #1
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msr oslar_el1, x0
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.endm
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.section .crt0.text.start, "ax", %progbits
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.align 6
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.global _start
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_start:
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/* mask all interrupts */
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msr daifset, #0xF
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/* Fixup hardware erratum */
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ERRATUM_INVALIDATE_BTB_AT_BOOT
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/* Set the stack pointer to a temporary location. */
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ldr x20, =0x7C020000
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mov sp, x20
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/* Call our init array functions. */
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bl __libc_init_array
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/* Uncompress the program and iram boot code images. */
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b _ZN3ams6secmon6loader20UncompressAndExecuteEv
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