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lastdragon
2026-09-06 12:53:21 -06:00
parent 662efe3c2a
commit ad2088d178
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linux-7.2.3/arch/x86/kernel/acpi/madt_playdead.S
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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/linkage.h>
#include <asm/nospec-branch.h>
#include <asm/page_types.h>
#include <asm/processor-flags.h>
.text
.align PAGE_SIZE
/*
* asm_acpi_mp_play_dead() - Hand over control of the CPU to the BIOS
*
* rdi: Address of the ACPI MADT MPWK ResetVector
* rsi: PGD of the identity mapping
*/
SYM_FUNC_START(asm_acpi_mp_play_dead)
ANNOTATE_NOENDBR
/* Turn off global entries. Following CR3 write will flush them. */
movq %cr4, %rdx
andq $~(X86_CR4_PGE), %rdx
movq %rdx, %cr4
/* Switch to identity mapping */
movq %rsi, %cr3
/* Jump to reset vector */
ANNOTATE_RETPOLINE_SAFE
jmp *%rdi
SYM_FUNC_END(asm_acpi_mp_play_dead)