51 lines
1.6 KiB
NASM
51 lines
1.6 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2025-2025. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License v2 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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use64
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VIRT_KERNEL_BASE = 0xFFFFFFFF80000000
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DEFAULT_STACK_SIZE = 8192
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org VIRT_KERNEL_BASE
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dq 'KERNEL64' ; magic
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dq k64_entry - VIRT_KERNEL_BASE ; entry point's offset from base where it loaded
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dq DEFAULT_STACK_SIZE ; how many bytes of stack we need
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kernel_phys_start dq 0 ; bootloader will put here phys addr where it loaded kernel
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kernel_phys_end dq 0 ; and phys end addr (including stack ofc)
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; 64 bit kernel entry point
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k64_entry:
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;; NOTE! oops addresses are incorrect
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pop qword [qword puthex_ptr - VIRT_KERNEL_BASE]
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pop qword [qword putstr_ptr - VIRT_KERNEL_BASE]
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sub rsp, 0x20
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mov rcx, kmsg_hello - VIRT_KERNEL_BASE
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call qword [qword putstr_ptr - VIRT_KERNEL_BASE]
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add rsp, 0x20
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sub rsp, 0x20
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mov rcx, kmsg_ripis - VIRT_KERNEL_BASE
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call qword [qword putstr_ptr - VIRT_KERNEL_BASE]
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add rsp, 0x20
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sub rsp, 0x20
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lea rcx, [rip]
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call qword [qword puthex_ptr - VIRT_KERNEL_BASE]
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add rsp, 0x20
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jmp $
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kmsg_hello db 'Hello from KERNEL',13,10,0
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kmsg_ripis db 'RIP = ',13,10,0
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puthex_ptr dq 0
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putstr_ptr dq 0
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