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8fc5b4d4 VG |
1 | /* |
2 | * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) | |
3 | * Copyright (C) 2014 Red Hat Inc. | |
4 | ||
5 | * Author(s): Vivek Goyal <vgoyal@redhat.com> | |
6 | * | |
7 | * This code has been taken from kexec-tools. | |
8 | * | |
9 | * This source code is licensed under the GNU General Public License, | |
10 | * Version 2. See the file COPYING for more details. | |
11 | */ | |
12 | ||
13 | .text | |
14 | .balign 16 | |
15 | .code64 | |
16 | .globl entry64, entry64_regs | |
17 | ||
18 | ||
19 | entry64: | |
20 | /* Setup a gdt that should be preserved */ | |
21 | lgdt gdt(%rip) | |
22 | ||
23 | /* load the data segments */ | |
24 | movl $0x18, %eax /* data segment */ | |
25 | movl %eax, %ds | |
26 | movl %eax, %es | |
27 | movl %eax, %ss | |
28 | movl %eax, %fs | |
29 | movl %eax, %gs | |
30 | ||
31 | /* Setup new stack */ | |
32 | leaq stack_init(%rip), %rsp | |
33 | pushq $0x10 /* CS */ | |
34 | leaq new_cs_exit(%rip), %rax | |
35 | pushq %rax | |
36 | lretq | |
37 | new_cs_exit: | |
38 | ||
39 | /* Load the registers */ | |
40 | movq rax(%rip), %rax | |
41 | movq rbx(%rip), %rbx | |
42 | movq rcx(%rip), %rcx | |
43 | movq rdx(%rip), %rdx | |
44 | movq rsi(%rip), %rsi | |
45 | movq rdi(%rip), %rdi | |
46 | movq rsp(%rip), %rsp | |
47 | movq rbp(%rip), %rbp | |
48 | movq r8(%rip), %r8 | |
49 | movq r9(%rip), %r9 | |
50 | movq r10(%rip), %r10 | |
51 | movq r11(%rip), %r11 | |
52 | movq r12(%rip), %r12 | |
53 | movq r13(%rip), %r13 | |
54 | movq r14(%rip), %r14 | |
55 | movq r15(%rip), %r15 | |
56 | ||
57 | /* Jump to the new code... */ | |
58 | jmpq *rip(%rip) | |
59 | ||
60 | .section ".rodata" | |
61 | .balign 4 | |
62 | entry64_regs: | |
63 | rax: .quad 0x0 | |
8fc5b4d4 VG |
64 | rcx: .quad 0x0 |
65 | rdx: .quad 0x0 | |
dd5f7260 | 66 | rbx: .quad 0x0 |
8fc5b4d4 VG |
67 | rsp: .quad 0x0 |
68 | rbp: .quad 0x0 | |
dd5f7260 VG |
69 | rsi: .quad 0x0 |
70 | rdi: .quad 0x0 | |
8fc5b4d4 VG |
71 | r8: .quad 0x0 |
72 | r9: .quad 0x0 | |
73 | r10: .quad 0x0 | |
74 | r11: .quad 0x0 | |
75 | r12: .quad 0x0 | |
76 | r13: .quad 0x0 | |
77 | r14: .quad 0x0 | |
78 | r15: .quad 0x0 | |
79 | rip: .quad 0x0 | |
80 | .size entry64_regs, . - entry64_regs | |
81 | ||
82 | /* GDT */ | |
83 | .section ".rodata" | |
84 | .balign 16 | |
85 | gdt: | |
86 | /* 0x00 unusable segment | |
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 | |
99 | gdt_end: | |
100 | stack: .quad 0, 0 | |
101 | stack_init: |