114 lines
1.8 KiB
NASM
114 lines
1.8 KiB
NASM
cpu 8086
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org 0x0000
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; interrupt vector we store addr of data segment in
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bssvec: equ 0xB6
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db 0x55, 0xAA
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db 0x00
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jmp near init
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times (0x18 - ($-$$)) db 0
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dw 0
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dw pnp
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pnp: db "$PnP"
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db 1 ; version 1
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db 2 ; 2 * 16 length
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dw 0 ; offset of next header
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db 0
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db 0 ; checksum (filled by fix-rom)
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dd 0 ; device identifier
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dw 0 ; manufacturer string
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dw name ; product name string
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db 0,0,0 ; device type string
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db 0x20 ; device indicator, bit for "read cacheable" set
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dw 0 ; boot connection vector
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dw 0 ; boot disconnect vector
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dw 0 ; bootstrap entry point
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dw 0 ; reserved
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zero: dw 0
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name: db "rdos debug", 0
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init: push ds
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push ax
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push cx
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; DS := 0
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xor ax, ax
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mov ds, ax
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; allocate a single kilobyte from end of lowmem
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dec word [0x413]
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; calculate segment from kilobytes
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mov ax, [0x413]
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mov cl, 6
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shl ax, cl
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; store ptr to our data segment in B6h vector
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mov word [bssvec*4], ax
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; set entry points vectors
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mov word [1*4], int3entry
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mov word [1*4+2], cs
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mov word [3*4], int3entry
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mov word [3*4+2], cs
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pop cx
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pop ax
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pop ds
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retf
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; Expects DI to mark end of command
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runcmd: mov si, inbuf
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lodsb
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cmp al, 'G'
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je cmd_g
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cmp al, 'H'
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je cmd_h
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cmp al, 'R'
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je cmd_r
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cmp al, 'T'
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je cmd_t
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cmp al, '?'
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je cmd_?
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cerr: mov al, '?'
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call putc
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jmp crlf
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%include "debug/chario.asm"
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%include "debug/parse.asm"
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%include "debug/names.asm"
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%include "debug/edit.asm"
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%include "debug/run.asm"
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%include "debug/util.asm"
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align 512
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absolute 0
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reg_ax: resw 1
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reg_cx: resw 1
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reg_dx: resw 1
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reg_bx: resw 1
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reg_sp: resw 1
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reg_bp: resw 1
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reg_si: resw 1
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reg_di: resw 1
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reg_es: resw 1
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reg_cs: resw 1
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reg_ss: resw 1
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reg_ds: resw 1
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reg_ip: resw 1
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reg_fl: resw 1
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ingetc: resw 1
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inmin: resb 1
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inmax: resb 1
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inbuf: resb 0x20
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; reserve at least 80h words for stack
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resw 0x80
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alignb 1024
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stack:
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