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Atmosphere/exosphere/program/source/smc/secmon_smc_cpu_asm.s
2020-06-14 22:07:45 -07:00

94 lines
2.7 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
.section .text._ZN3ams6secmon3smc19PivotStackAndInvokeEPvPFvvE, "ax", %progbits
.align 4
.global _ZN3ams6secmon3smc19PivotStackAndInvokeEPvPFvvE
_ZN3ams6secmon3smc19PivotStackAndInvokeEPvPFvvE:
/* Pivot to use the provided stack pointer. */
mov sp, x0
/* Release our lock on the common smc stack. */
mov x19, x1
bl _ZN3ams6secmon25ReleaseCommonSmcStackLockEv
/* Invoke the function with the new stack. */
br x19
.section .text._ZN3ams6secmon3smc16FinalizePowerOffEv, "ax", %progbits
.align 4
.global _ZN3ams6secmon3smc16FinalizePowerOffEv
_ZN3ams6secmon3smc16FinalizePowerOffEv:
/* Disable all caches by clearing sctlr_el1.C. */
mrs x0, sctlr_el1
and x0, x0, #~(1 << 2)
msr sctlr_el1, x0
isb
/* Disable all caches by clearing sctlr_el3.C. */
mrs x0, sctlr_el3
and x0, x0, #~(1 << 2)
msr sctlr_el3, x0
isb
/* Disable prefetching of page table walking descriptors. */
mrs x0, cpuectlr_el1
orr x0, x0, #(1 << 38)
/* Disable prefetching of instructions. */
and x0, x0, #~(3 << 35)
/* Disable prefetching of data. */
and x0, x0, #~(3 << 32)
msr cpuectlr_el1, x0
isb
/* Ensure that all data prefetching prior to our configuration change completes. */
dsb sy
/* Flush the entire data cache (local). */
bl _ZN3ams6secmon25FlushEntireDataCacheLocalEv
/* Disable receiving instruction cache/TLB maintenance operations. */
mrs x0, cpuectlr_el1
and x0, x0, #~(1 << 6)
msr cpuectlr_el1, x0
/* Configure the gic to not send interrupts to the current core. */
ldr x1, =0x1F0043000
mov w0, #0x1E0 /* Set FIQBypDisGrp1, IRQBypDisGrp1, reserved bits 7/8. */
str w0, [x1]
/* Lock the OS Double Lock. */
mrs x0, osdlr_el1
orr x0, x0, #(1 << 0)
msr osdlr_el1, x0
/* Ensure that our configuration takes. */
isb
dsb sy
/* Wait for interrupts, infinitely. */
0:
wfi
b 0b