109 lines
1.6 KiB
ArmAsm
109 lines
1.6 KiB
ArmAsm
# Multiboot2 header and x86_64 long-mode bootstrap
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.section .multiboot2, "a"
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.align 8
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multiboot_header:
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.long 0xe85250d6
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.long 0
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.long multiboot_header_end - multiboot_header
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.long -(0xe85250d6 + 0 + (multiboot_header_end - multiboot_header))
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.align 8
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.word 0
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.word 0
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.long 8
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multiboot_header_end:
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.section .bss, "aw", @nobits
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.align 4096
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pml4:
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.space 4096
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pdpt:
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.space 4096
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pd:
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.space 4096
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.align 16
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stack_bottom:
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.space 16384
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stack_top:
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.section .text
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.code32
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.global _start
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.type _start, @function
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_start:
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movl $stack_top, %esp
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cld
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movl $__bss_start, %edi
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movl $__bss_end, %ecx
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subl %edi, %ecx
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xorl %eax, %eax
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rep stosb
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movl $pdpt, %eax
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orl $0x03, %eax
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movl %eax, pml4
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movl $pd, %eax
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orl $0x03, %eax
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movl %eax, pdpt
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movl $0x00000083, %eax
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movl $pd, %edi
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movl $512, %ecx
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1:
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movl %eax, (%edi)
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addl $0x200000, %eax
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addl $8, %edi
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loop 1b
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movl $pml4, %eax
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movl %eax, %cr3
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movl %cr4, %eax
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orl $0x20, %eax
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movl %eax, %cr4
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movl $0xC0000080, %ecx
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rdmsr
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orl $0x100, %eax
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wrmsr
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movl %cr0, %eax
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orl $0x80000000, %eax
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movl %eax, %cr0
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lgdt gdt64_pointer
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ljmp $0x08, $long_mode_start
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.code64
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long_mode_start:
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movabsq $stack_top, %rax
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movq %rax, %rsp
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call kernel_main
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cli
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1:
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hlt
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jmp 1b
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.section .note.Xen, "a", @note
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.align 4
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.long 4
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.long 4
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.long 18
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.asciz "Xen"
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.align 4
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.long _start
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.section .rodata
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.align 8
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gdt64:
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.quad 0x0000000000000000
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.quad 0x00209A0000000000
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gdt64_pointer:
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.word gdt64_pointer - gdt64 - 1
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.quad gdt64
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