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4.18.0-553.64.1.el8_10.x86_64
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arch
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x86
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purgatory
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📄 Makefile
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📄 entry64.S
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📄 purgatory.c
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📄 setup-x86_64.S
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📄 stack.S
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EDIT: setup-x86_64.S
/* * purgatory: setup code * * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) * Copyright (C) 2014 Red Hat Inc. * * This code has been taken from kexec-tools. * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ #include <asm/purgatory.h> .text .globl purgatory_start .balign 16 purgatory_start: .code64 /* Load a gdt so I know what the segment registers are */ lgdt gdt(%rip) /* load the data segments */ movl $0x18, %eax /* data segment */ movl %eax, %ds movl %eax, %es movl %eax, %ss movl %eax, %fs movl %eax, %gs /* Setup a stack */ leaq lstack_end(%rip), %rsp /* Call the C code */ call purgatory jmp entry64 .section ".rodata" .balign 16 gdt: /* 0x00 unusable segment * 0x08 unused * so use them as the gdt ptr */ .word gdt_end - gdt - 1 .quad gdt .word 0, 0, 0 /* 0x10 4GB flat code segment */ .word 0xFFFF, 0x0000, 0x9A00, 0x00AF /* 0x18 4GB flat data segment */ .word 0xFFFF, 0x0000, 0x9200, 0x00CF gdt_end: .bss .balign 4096 lstack: .skip 4096 lstack_end: