1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2003,2004 Eric Biederman (eb
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.
9 */
10
11 #include <linux/linkage.h>
12
13 .text
14 .balign 16
15 .code64
16
17 SYM_CODE_START(entry64)
18 /* Setup a gdt that should be preserve
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 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)
57 SYM_CODE_END(entry64)
58
59 .section ".rodata"
60 .balign 4
61 SYM_DATA_START(entry64_regs)
62 rax: .quad 0x0
63 rcx: .quad 0x0
64 rdx: .quad 0x0
65 rbx: .quad 0x0
66 rsp: .quad 0x0
67 rbp: .quad 0x0
68 rsi: .quad 0x0
69 rdi: .quad 0x0
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
79 SYM_DATA_END(entry64_regs)
80
81 /* GDT */
82 .section ".rodata"
83 .balign 16
84 SYM_DATA_START_LOCAL(gdt)
85 /*
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 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_i
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