^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2014 Red Hat Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Vivek Goyal <vgoyal@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This code has been taken from kexec-tools.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) .text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) .balign 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) .code64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) SYM_CODE_START(entry64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /* Setup a gdt that should be preserved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) lgdt gdt(%rip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* load the data segments */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) movl $0x18, %eax /* data segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) movl %eax, %ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) movl %eax, %es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) movl %eax, %ss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) movl %eax, %fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) movl %eax, %gs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* Setup new stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) leaq stack_init(%rip), %rsp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) pushq $0x10 /* CS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) leaq new_cs_exit(%rip), %rax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) pushq %rax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) lretq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) new_cs_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Load the registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) movq rax(%rip), %rax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) movq rbx(%rip), %rbx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) movq rcx(%rip), %rcx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) movq rdx(%rip), %rdx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) movq rsi(%rip), %rsi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) movq rdi(%rip), %rdi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) movq rsp(%rip), %rsp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) movq rbp(%rip), %rbp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) movq r8(%rip), %r8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) movq r9(%rip), %r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) movq r10(%rip), %r10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) movq r11(%rip), %r11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) movq r12(%rip), %r12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) movq r13(%rip), %r13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) movq r14(%rip), %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) movq r15(%rip), %r15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* Jump to the new code... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) jmpq *rip(%rip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) SYM_CODE_END(entry64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .section ".rodata"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .balign 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) SYM_DATA_START(entry64_regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) rax: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) rcx: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) rdx: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) rbx: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) rsp: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) rbp: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) rsi: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) rdi: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) r8: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) r9: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) r10: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) r11: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) r12: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) r13: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) r14: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) r15: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) rip: .quad 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) SYM_DATA_END(entry64_regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* GDT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .section ".rodata"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .balign 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) SYM_DATA_START_LOCAL(gdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * 0x00 unusable segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * 0x08 unused
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * so use them as gdt ptr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .word gdt_end - gdt - 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .quad gdt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .word 0, 0, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* 0x10 4GB flat code segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .word 0xFFFF, 0x0000, 0x9A00, 0x00AF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* 0x18 4GB flat data segment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .word 0xFFFF, 0x0000, 0x9200, 0x00CF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) SYM_DATA_START_LOCAL(stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .quad 0, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) SYM_DATA_END_LABEL(stack, SYM_L_LOCAL, stack_init)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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