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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * purgatory: setup code
- *
- * Copyright (C) 2003,2004 Eric Biederman ([email protected])
- * Copyright (C) 2014 Red Hat Inc.
- *
- * This code has been taken from kexec-tools.
- */
- #include <linux/linkage.h>
- #include <asm/purgatory.h>
- .text
- .balign 16
- .code64
- SYM_CODE_START(purgatory_start)
- /* 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
- SYM_CODE_END(purgatory_start)
- .section ".rodata"
- .balign 16
- SYM_DATA_START_LOCAL(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
- SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end)
- .bss
- .balign 4096
- SYM_DATA_START_LOCAL(lstack)
- .skip 4096
- SYM_DATA_END_LABEL(lstack, SYM_L_LOCAL, lstack_end)
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