https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e authored by Linus Torvalds on 11 April 2022, 00:21:36 UTC
Linux 5.18-rc2
Linux 5.18-rc2
Tip revision: ce522ba
pmjump.S
/* SPDX-License-Identifier: GPL-2.0-only */
/* ----------------------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
*
* ----------------------------------------------------------------------- */
/*
* The actual transition into protected mode
*/
#include <asm/boot.h>
#include <asm/processor-flags.h>
#include <asm/segment.h>
#include <linux/linkage.h>
.text
.code16
/*
* void protected_mode_jump(u32 entrypoint, u32 bootparams);
*/
SYM_FUNC_START_NOALIGN(protected_mode_jump)
movl %edx, %esi # Pointer to boot_params table
xorl %ebx, %ebx
movw %cs, %bx
shll $4, %ebx
addl %ebx, 2f
jmp 1f # Short jump to serialize on 386/486
1:
movw $__BOOT_DS, %cx
movw $__BOOT_TSS, %di
movl %cr0, %edx
orb $X86_CR0_PE, %dl # Protected mode
movl %edx, %cr0
# Transition to 32-bit mode
.byte 0x66, 0xea # ljmpl opcode
2: .long .Lin_pm32 # offset
.word __BOOT_CS # segment
SYM_FUNC_END(protected_mode_jump)
.code32
.section ".text32","ax"
SYM_FUNC_START_LOCAL_NOALIGN(.Lin_pm32)
# Set up data segments for flat 32-bit mode
movl %ecx, %ds
movl %ecx, %es
movl %ecx, %fs
movl %ecx, %gs
movl %ecx, %ss
# The 32-bit code sets up its own stack, but this way we do have
# a valid stack if some debugging hack wants to use it.
addl %ebx, %esp
# Set up TR to make Intel VT happy
ltr %di
# Clear registers to allow for future extensions to the
# 32-bit boot protocol
xorl %ecx, %ecx
xorl %edx, %edx
xorl %ebx, %ebx
xorl %ebp, %ebp
xorl %edi, %edi
# Set up LDTR to make Intel VT happy
lldt %cx
jmpl *%eax # Jump to the 32-bit entrypoint
SYM_FUNC_END(.Lin_pm32)