mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-15 00:16:48 +00:00
105 lines
2.8 KiB
ArmAsm
105 lines
2.8 KiB
ArmAsm
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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/>.
|
|
*/
|
|
|
|
/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
|
|
#define cpuactlr_el1 s3_1_c15_c2_0
|
|
#define cpuectlr_el1 s3_1_c15_c2_1
|
|
|
|
.macro RESET_CORE
|
|
mov x0, #(1 << 63)
|
|
msr cpuactlr_el1, x0 /* disable regional clock gating */
|
|
isb
|
|
mov x0, #3
|
|
msr rmr_el3, x0
|
|
isb
|
|
dsb sy
|
|
/* Nintendo forgot to copy-paste the branch instruction below. */
|
|
1:
|
|
wfi
|
|
b 1b
|
|
.endm
|
|
|
|
.macro ERRATUM_INVALIDATE_BTB_AT_BOOT
|
|
/* Nintendo copy-pasted https://github.com/ARM-software/arm-trusted-firmware/blob/master/plat/nvidia/tegra/common/aarch64/tegra_helpers.S#L312 */
|
|
/*
|
|
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
/* The following comments are mine. */
|
|
|
|
/*
|
|
Enable invalidates of branch target buffer, then flush
|
|
the entire instruction cache at the local level, and
|
|
with the reg change, the branch target buffer, then disable
|
|
invalidates of the branch target buffer again.
|
|
*/
|
|
mrs x0, cpuactlr_el1
|
|
orr x0, x0, #1
|
|
msr cpuactlr_el1, x0
|
|
|
|
dsb sy
|
|
isb
|
|
ic iallu
|
|
dsb sy
|
|
isb
|
|
|
|
mrs x0, cpuactlr_el1
|
|
bic x0, x0, #1
|
|
msr cpuactlr_el1, x0
|
|
|
|
.rept 7
|
|
nop /* wait long enough for the write to cpuactlr_el1 to have completed */
|
|
.endr
|
|
|
|
/* if the OS lock is set, disable it and request a warm reset */
|
|
mrs x0, oslsr_el1
|
|
ands x0, x0, #2
|
|
b.eq 2f
|
|
mov x0, xzr
|
|
msr oslar_el1, x0
|
|
|
|
RESET_CORE
|
|
|
|
.rept 65
|
|
nop /* guard against speculative excecution */
|
|
.endr
|
|
|
|
2:
|
|
/* set the OS lock */
|
|
mov x0, #1
|
|
msr oslar_el1, x0
|
|
.endm
|
|
|
|
.section .crt0.text.start, "ax", %progbits
|
|
.align 6
|
|
.global _start
|
|
_start:
|
|
/* mask all interrupts */
|
|
msr daifset, #0xF
|
|
|
|
/* Fixup hardware erratum */
|
|
ERRATUM_INVALIDATE_BTB_AT_BOOT
|
|
|
|
/* Set the stack pointer to a temporary location. */
|
|
ldr x20, =0x7C020000
|
|
mov sp, x20
|
|
|
|
/* Call our init array functions. */
|
|
bl __libc_init_array
|
|
|
|
/* Uncompress the program and iram boot code images. */
|
|
b _ZN3ams6secmon6loader20UncompressAndExecuteEv
|