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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
| * Copyright (C) 2014 Red Hat Inc.
|
| * Author(s): Vivek Goyal <vgoyal@redhat.com>
| *
| * This code has been taken from kexec-tools.
| */
|
| #include <linux/linkage.h>
|
| .text
| .balign 16
| .code64
|
| SYM_CODE_START(entry64)
| /* Setup a gdt that should be preserved */
| 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 new stack */
| leaq stack_init(%rip), %rsp
| pushq $0x10 /* CS */
| leaq new_cs_exit(%rip), %rax
| pushq %rax
| lretq
| new_cs_exit:
|
| /* Load the registers */
| movq rax(%rip), %rax
| movq rbx(%rip), %rbx
| movq rcx(%rip), %rcx
| movq rdx(%rip), %rdx
| movq rsi(%rip), %rsi
| movq rdi(%rip), %rdi
| movq rsp(%rip), %rsp
| movq rbp(%rip), %rbp
| movq r8(%rip), %r8
| movq r9(%rip), %r9
| movq r10(%rip), %r10
| movq r11(%rip), %r11
| movq r12(%rip), %r12
| movq r13(%rip), %r13
| movq r14(%rip), %r14
| movq r15(%rip), %r15
|
| /* Jump to the new code... */
| jmpq *rip(%rip)
| SYM_CODE_END(entry64)
|
| .section ".rodata"
| .balign 4
| SYM_DATA_START(entry64_regs)
| rax: .quad 0x0
| rcx: .quad 0x0
| rdx: .quad 0x0
| rbx: .quad 0x0
| rsp: .quad 0x0
| rbp: .quad 0x0
| rsi: .quad 0x0
| rdi: .quad 0x0
| r8: .quad 0x0
| r9: .quad 0x0
| r10: .quad 0x0
| r11: .quad 0x0
| r12: .quad 0x0
| r13: .quad 0x0
| r14: .quad 0x0
| r15: .quad 0x0
| rip: .quad 0x0
| SYM_DATA_END(entry64_regs)
|
| /* GDT */
| .section ".rodata"
| .balign 16
| SYM_DATA_START_LOCAL(gdt)
| /*
| * 0x00 unusable segment
| * 0x08 unused
| * so use them as 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
| SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end)
|
| SYM_DATA_START_LOCAL(stack)
| .quad 0, 0
| SYM_DATA_END_LABEL(stack, SYM_L_LOCAL, stack_init)
|
|
