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- /*
- * 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:
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