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/* SPDX-License-Identifier: GPL-2.0-only */ /* * purgatory: setup code * * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) * Copyright (C) 2014 Red Hat Inc. * * This code has been taken from kexec-tools. */ #include <linux/linkage.h> #include <asm/purgatory.h> .text .balign 16 .code64 SYM_CODE_START(purgatory_start) /* Load a gdt so I know what the segment registers are */ 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 a stack */ leaq lstack_end(%rip), %rsp /* Call the C code */ call purgatory jmp entry64 SYM_CODE_END(purgatory_start) .section ".rodata" .balign 16 SYM_DATA_START_LOCAL(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 SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end) .bss .balign 4096 SYM_DATA_START_LOCAL(lstack) .skip 4096 SYM_DATA_END_LABEL(lstack, SYM_L_LOCAL, lstack_end)