49 lines
1000 B
NASM
49 lines
1000 B
NASM
; fox32os bootloader
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org 0x00000800
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const LOAD_ADDRESS: 0x03000000
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; fox32rom passed the boot disk id in r0, save it
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mov.8 [boot_disk_id], r0
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; open kernel.fxf
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mov r1, r0
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mov r0, kernel_file_name
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mov r2, kernel_file_struct
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call [0xF0045008] ; ryfs_open
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cmp r0, 0
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ifz jmp error
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; load it into memory
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mov r0, kernel_file_struct
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mov r1, LOAD_ADDRESS
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call [0xF0045014] ; ryfs_read_whole_file
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; relocate it and off we go!!
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mov r0, LOAD_ADDRESS
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call fxf_reloc
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mov r1, r0
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movz.8 r0, [boot_disk_id]
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jmp r1
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error:
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mov r0, error_str
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movz.8 r1, 16
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movz.8 r2, 16
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mov r3, 0xFFFFFFFF
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movz.8 r4, 0
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call [0xF0042004] ; draw_str_to_background
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rjmp 0
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kernel_file_name: data.strz "kernel fxf"
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kernel_file_struct: data.fill 0, 32
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error_str: data.strz "failed to open kernel file"
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boot_disk_id: data.8 0
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#include "reloc.asm"
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; bootable magic bytes
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org.pad 0x000009FC
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data.32 0x523C334C
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