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59 lines
1.2 KiB
59 lines
1.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* purgatory: setup code |
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* |
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* Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) |
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* Copyright (C) 2014 Red Hat Inc. |
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* |
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* This code has been taken from kexec-tools. |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/purgatory.h> |
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.text |
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.balign 16 |
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.code64 |
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SYM_CODE_START(purgatory_start) |
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/* Load a gdt so I know what the segment registers are */ |
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lgdt gdt(%rip) |
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/* load the data segments */ |
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movl $0x18, %eax /* data segment */ |
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movl %eax, %ds |
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movl %eax, %es |
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movl %eax, %ss |
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movl %eax, %fs |
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movl %eax, %gs |
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/* Setup a stack */ |
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leaq lstack_end(%rip), %rsp |
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/* Call the C code */ |
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call purgatory |
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jmp entry64 |
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SYM_CODE_END(purgatory_start) |
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.section ".rodata" |
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.balign 16 |
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SYM_DATA_START_LOCAL(gdt) |
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/* 0x00 unusable segment |
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* 0x08 unused |
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* so use them as the gdt ptr |
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*/ |
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.word gdt_end - gdt - 1 |
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.quad gdt |
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.word 0, 0, 0 |
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/* 0x10 4GB flat code segment */ |
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.word 0xFFFF, 0x0000, 0x9A00, 0x00AF |
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/* 0x18 4GB flat data segment */ |
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.word 0xFFFF, 0x0000, 0x9200, 0x00CF |
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SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end) |
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.bss |
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.balign 4096 |
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SYM_DATA_START_LOCAL(lstack) |
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.skip 4096 |
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SYM_DATA_END_LABEL(lstack, SYM_L_LOCAL, lstack_end)
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