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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)