Commit | Line | Data |
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40b0b3f8 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
8fc5b4d4 VG |
2 | /* |
3 | * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) | |
4 | * Copyright (C) 2014 Red Hat Inc. | |
5 | ||
6 | * Author(s): Vivek Goyal <vgoyal@redhat.com> | |
7 | * | |
8 | * This code has been taken from kexec-tools. | |
8fc5b4d4 VG |
9 | */ |
10 | ||
b16fed65 JS |
11 | #include <linux/linkage.h> |
12 | ||
8fc5b4d4 VG |
13 | .text |
14 | .balign 16 | |
15 | .code64 | |
8fc5b4d4 | 16 | |
b16fed65 | 17 | SYM_CODE_START(entry64) |
8fc5b4d4 VG |
18 | /* Setup a gdt that should be preserved */ |
19 | lgdt gdt(%rip) | |
20 | ||
21 | /* load the data segments */ | |
22 | movl $0x18, %eax /* data segment */ | |
23 | movl %eax, %ds | |
24 | movl %eax, %es | |
25 | movl %eax, %ss | |
26 | movl %eax, %fs | |
27 | movl %eax, %gs | |
28 | ||
29 | /* Setup new stack */ | |
30 | leaq stack_init(%rip), %rsp | |
31 | pushq $0x10 /* CS */ | |
32 | leaq new_cs_exit(%rip), %rax | |
33 | pushq %rax | |
34 | lretq | |
35 | new_cs_exit: | |
36 | ||
37 | /* Load the registers */ | |
38 | movq rax(%rip), %rax | |
39 | movq rbx(%rip), %rbx | |
40 | movq rcx(%rip), %rcx | |
41 | movq rdx(%rip), %rdx | |
42 | movq rsi(%rip), %rsi | |
43 | movq rdi(%rip), %rdi | |
44 | movq rsp(%rip), %rsp | |
45 | movq rbp(%rip), %rbp | |
46 | movq r8(%rip), %r8 | |
47 | movq r9(%rip), %r9 | |
48 | movq r10(%rip), %r10 | |
49 | movq r11(%rip), %r11 | |
50 | movq r12(%rip), %r12 | |
51 | movq r13(%rip), %r13 | |
52 | movq r14(%rip), %r14 | |
53 | movq r15(%rip), %r15 | |
54 | ||
55 | /* Jump to the new code... */ | |
56 | jmpq *rip(%rip) | |
b16fed65 | 57 | SYM_CODE_END(entry64) |
8fc5b4d4 VG |
58 | |
59 | .section ".rodata" | |
60 | .balign 4 | |
b16fed65 | 61 | SYM_DATA_START(entry64_regs) |
8fc5b4d4 | 62 | rax: .quad 0x0 |
8fc5b4d4 VG |
63 | rcx: .quad 0x0 |
64 | rdx: .quad 0x0 | |
dd5f7260 | 65 | rbx: .quad 0x0 |
8fc5b4d4 VG |
66 | rsp: .quad 0x0 |
67 | rbp: .quad 0x0 | |
dd5f7260 VG |
68 | rsi: .quad 0x0 |
69 | rdi: .quad 0x0 | |
8fc5b4d4 VG |
70 | r8: .quad 0x0 |
71 | r9: .quad 0x0 | |
72 | r10: .quad 0x0 | |
73 | r11: .quad 0x0 | |
74 | r12: .quad 0x0 | |
75 | r13: .quad 0x0 | |
76 | r14: .quad 0x0 | |
77 | r15: .quad 0x0 | |
78 | rip: .quad 0x0 | |
b16fed65 | 79 | SYM_DATA_END(entry64_regs) |
8fc5b4d4 VG |
80 | |
81 | /* GDT */ | |
82 | .section ".rodata" | |
83 | .balign 16 | |
b16fed65 JS |
84 | SYM_DATA_START_LOCAL(gdt) |
85 | /* | |
86 | * 0x00 unusable segment | |
8fc5b4d4 VG |
87 | * 0x08 unused |
88 | * so use them as gdt ptr | |
89 | */ | |
90 | .word gdt_end - gdt - 1 | |
91 | .quad gdt | |
92 | .word 0, 0, 0 | |
93 | ||
94 | /* 0x10 4GB flat code segment */ | |
95 | .word 0xFFFF, 0x0000, 0x9A00, 0x00AF | |
96 | ||
97 | /* 0x18 4GB flat data segment */ | |
98 | .word 0xFFFF, 0x0000, 0x9200, 0x00CF | |
b16fed65 JS |
99 | SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end) |
100 | ||
101 | SYM_DATA_START_LOCAL(stack) | |
102 | .quad 0, 0 | |
103 | SYM_DATA_END_LABEL(stack, SYM_L_LOCAL, stack_init) |