1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * purgatory: setup code
4 *
5 * Copyright (C) 2003,2004 Eric Biederman (eb
6 * Copyright (C) 2014 Red Hat Inc.
7 *
8 * This code has been taken from kexec-tools.
9 */
10 #include <linux/linkage.h>
11 #include <asm/purgatory.h>
12
13 .text
14 .balign 16
15 .code64
16
17 SYM_CODE_START(purgatory_start)
18 /* Load a gdt so I know what the segme
19 lgdt gdt(%rip)
20
21 /* load the data segments */
22 movl $0x18, %eax /* data segmen
23 movl %eax, %ds
24 movl %eax, %es
25 movl %eax, %ss
26 movl %eax, %fs
27 movl %eax, %gs
28
29 /* Setup a stack */
30 leaq lstack_end(%rip), %rsp
31
32 /* Call the C code */
33 call purgatory
34 jmp entry64
35 SYM_CODE_END(purgatory_start)
36
37 .section ".rodata"
38 .balign 16
39 SYM_DATA_START_LOCAL(gdt)
40 /* 0x00 unusable segment
41 * 0x08 unused
42 * so use them as the gdt ptr
43 */
44 .word gdt_end - gdt - 1
45 .quad gdt
46 .word 0, 0, 0
47
48 /* 0x10 4GB flat code segment */
49 .word 0xFFFF, 0x0000, 0x9A00, 0x00AF
50
51 /* 0x18 4GB flat data segment */
52 .word 0xFFFF, 0x0000, 0x9200, 0x00CF
53 SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end)
54
55 .bss
56 .balign 4096
57 SYM_DATA_START_LOCAL(lstack)
58 .skip 4096
59 SYM_DATA_END_LABEL(lstack, SYM_L_LOCAL, lstack
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