rdos/kernel/main.asm

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NASM
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cpu 8086
self: equ 0xF000
diskbuf: equ (self-0x200) ; deblocking
stack: equ (diskbuf) ; grows down
defdrv: equ 4
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org self
jmp init
pad 3
self_offset:
db (self >> 8)
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banner:
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db "RDOS 2019-09", 0x0A, 0x0D, '$', 0
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init:
mov sp, stack
mov byte [defdrv], 0x01
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mov dx, banner
call print_string
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call disk_parm_init
mov dl, 0x00
call disk_select
cli
.halt:
hlt
jmp .halt
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init_program:
db "HELLO.COM", 0
cpm_syscall:
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cmp cl, 0
je init
cmp cl, 1
je console_input
cmp cl, 2
je console_output
cmp cl, 9
je print_string
cmp cl, 10
je read_buffer
stc
ret
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%include "char.asm"
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%include "exec.asm"
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%include "fdc.asm"
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%include "fcb.asm"
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%include "fcbparse.asm"
%include "disk.asm"
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%include "log2.asm"
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%include "dump.asm"