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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "arch/debug.h"
.text
.code64
.balign 16
.globl entry64, entry64_regs
entry64:
/* Don't worry about special registers... */
/* 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
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)
.section ".rodata"
.balign 4
entry64_regs:
rax: .quad 0x00000000
rbx: .quad 0x00000000
rcx: .quad 0x00000000
rdx: .quad 0x00000000
rsi: .quad 0x00000000
rdi: .quad 0x00000000
rsp: .quad 0x00000000
rbp: .quad 0x00000000
r8: .quad 0x00000000
r9: .quad 0x00000000
r10: .quad 0x00000000
r11: .quad 0x00000000
r12: .quad 0x00000000
r13: .quad 0x00000000
r14: .quad 0x00000000
r15: .quad 0x00000000
rip: .quad entry32
.size entry64_regs, . - entry64_regs
.section ".rodata"
.balign 16
gdt: /* 0x00 unusable segment
* 0x08 unused
* so use them as the 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
gdt_end:
stack: .quad 0, 0
stack_init:
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