Split up kernel and debug rom
This commit is contained in:
parent
4fa383bb2e
commit
11b4d07dc1
11
Makefile
11
Makefile
@ -13,6 +13,8 @@ endif
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ifdef DEBUG
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QEMU_ARGS += -chardev file,path=debugcon.log,id=seabios
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QEMU_ARGS += -device isa-debugcon,iobase=0x402,chardev=seabios
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QEMU_ARGS += -option-rom debug.rom
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DEBUGROM = debug.rom
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endif
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ifndef DISPLAY
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@ -26,6 +28,9 @@ default: kernel.rom
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kernel.rom: kernel/*.asm lib/*.inc
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nasm -s -o $@ -I lib -I kernel kernel/main.asm && scripts/fix-rom.sh $@
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debug.rom: debug/*.asm lib/*.inc
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nasm -s -o $@ -I lib -I debug debug/main.asm && scripts/fix-rom.sh $@
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boot/%.bin: boot/%.asm lib/*.inc
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nasm -s -o $@ -I boot -I lib $<
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@ -38,11 +43,11 @@ fdimage.img: boot/floppy.bin kernel.rom
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clean:
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rm -f *.com *.bin *.rom *.img *.log boot/*.bin
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qemu-rom: kernel.rom
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qemu-rom: kernel.rom $(DEBUGROM)
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$(QEMU) $(QEMU_ARGS) -option-rom kernel.rom
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qemu-floppy: fdimage.img
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qemu-floppy: fdimage.img $(DEBUGROM)
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$(QEMU) $(QEMU_ARGS) -boot c -hda fdimage.img
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qemu-serial: boot/serial.bin
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qemu-serial: boot/serial.bin $(DEBUGROM)
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$(QEMU) $(QEMU_ARGS) -hda boot/serial.bin
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@ -116,11 +116,12 @@ isr_debug:
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pop cx
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pop dx
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pop bx
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pop bp ; sp to be ignored
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add sp, 2 ; ignore SP
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pop bp
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pop bp
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pop si
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pop di
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pop ds
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pop es
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pop ss
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iret
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add sp, 2 ; ignore SS
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iret
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206
debug/main.asm
Normal file
206
debug/main.asm
Normal file
@ -0,0 +1,206 @@
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cpu 8086
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org 0x0000
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rom:
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db 0x55, 0xAA
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.sectors:
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db 0x00
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.init:
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mov dx, isr_debug
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mov al, 0x1
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call intr_register
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mov al, 0x03
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call intr_register
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retf
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.name:
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db "rDebug", 0
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times (0x18 - ($-$$)) db 0
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.pcir_ptr:
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dw 0
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times (0x1A - ($-$$)) db 0
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.pnp_ptr:
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dw pnp
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pnp:
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db "$PnP"
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.version:
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db 1 ; version 1
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.length:
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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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.checksum:
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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 rom.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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dw 0
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putc:
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push bx
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push cx
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mov ah, 0x0e
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mov bx, 0x0000
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int 0x10
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pop cx
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pop bx
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ret
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intr_register:
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; DI = AL * 4
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mov ah, 4
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mul ah
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mov di, ax
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; ES = 0
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xor ax, ax
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mov es, ax
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; store offset
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mov ax, dx
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stosw
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; store segment
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mov ax, cs
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stosw
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ret
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; Names for words in debug frame
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; Two characters per word, 14 words total
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debug_frame_names:
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; general-purpose registers
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db "AXCXDXBXSPBPSIDI"
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; extra registers
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db "DSESSSIPCSFL"
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; Names for bits in debug_frame+26 (FL/Flags register)
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; One character per bit, 16 bits total
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debug_frame_flags:
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db "++++ODIT"
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db "SZ+A+P+C"
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; Print a single register from the frame
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; in SI frame offset for register
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debug_frame_register_print:
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mov bx, debug_frame_names
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mov al, [cs:bx+si] ; first name char load
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call putc
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mov al, [cs:bx+si+1] ; second name char load
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call putc
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mov al, '='
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call putc
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mov ax, [ss:bp+si] ; value load
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; prepare call to print_number
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push bx
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push cx
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mov bx, 0x0010
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mov cx, 3
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call print_number_padded
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pop cx
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pop bx
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mov al, ' '
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call putc
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ret
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debug_frame_print:
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mov si, 0
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mov cx, 8
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.reg1loop:
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call debug_frame_register_print
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add si, 2
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loop .reg1loop
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mov dx, [ss:bp+26]
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mov di, debug_frame_flags
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mov cx, 0x0010
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.flag_loop:
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mov al, [cs:di]
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inc di
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cmp al, '+'
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je .next
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test dx, 0x8000
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jnz .write
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mov al, '-'
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.write:
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call putc
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.next:
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sal dx, 1
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loop .flag_loop
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call printf
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db 0x0A, 0x0D, 0
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mov si, 16
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mov cx, 3
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.reg2loop:
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call debug_frame_register_print
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add si, 2
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loop .reg2loop
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mov ax, [bp+24]
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mov bx, 0x0010
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mov cx, 3
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call print_number_padded
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mov al, ':'
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call putc
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mov ax, [bp+22]
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mov bx, 0x0010
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mov cx, 3
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call print_number_padded
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call printf
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db 0x0A, 0x0D, 0
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ret
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; this prints registers
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; expect to be called as interrupt routine
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isr_debug:
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push ss
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push es
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push ds
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push di
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push si
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push bp
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push sp
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push bx
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push dx
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push cx
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push ax
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mov bp, sp
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mov [bp+08], bp
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add WORD [bp+08], 28
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call printf
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db 0x0A, 0x0D, 0
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call debug_frame_print
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pop ax
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pop cx
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pop dx
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pop bx
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pop bp
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pop bp
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pop si
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pop di
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pop ds
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pop es
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pop ss
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iret
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%include "printf.inc"
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align 512
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@ -1,15 +1,29 @@
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cpu 8086
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org 0x0000
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rom:
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db 0x55, 0xAA
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optrom_length:
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.sectors:
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db 0x00
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jmp optrom_init
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.init:
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push cs
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pop es
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; reserved area
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times (0x1A - ($-$$)) db 0
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mov di, start
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mov ax, 0x18
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call intr_register
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retf
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.name:
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db "ROM DOS", 0
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times (0x18 - ($-$$)) db 0
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.pcir_ptr:
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dw 0
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times (0x1A - ($-$$)) db 0
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.pnp_ptr:
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dw pnp
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align 16
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pnp:
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db "$PnP"
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.version:
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@ -21,8 +35,8 @@ pnp:
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.checksum:
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db 0 ; checksum (filled by fix-rom)
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dd 0 ; device identifier
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dw str_vendor ; manufacturer string
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dw str_product ; product name string
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dw 0 ; manufacturer string
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dw rom.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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@ -31,40 +45,6 @@ pnp:
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dw 0 ; reserved
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dw 0
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str_vendor:
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db "Nero", 0
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str_product:
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db "Nero DOS ", 60, 234, 62, 0
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optrom_init:
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push cs
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pop es
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mov di, isr_debug
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mov ax, 0x1
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call intr_register
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mov ax, 0x3
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call intr_register
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mov di, start
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mov ax, 0x18
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call intr_register
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retf
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announce:
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push ds
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push cs
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push cs
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pop ds
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mov ax, str_product
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push ax
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call printf
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db "%S (CS=%Xh)", 0x0A, 0x0D, 0x00
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add sp, 4
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pop ds
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ret
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start:
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xor ax, ax
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mov ds, ax
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@ -73,8 +53,6 @@ start:
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mov sp, 0x800
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mov di, sp
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call announce
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call drvtab_create
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push cs
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@ -86,6 +64,7 @@ start:
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.loop:
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mov ah, 0x01
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int 0x21
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int3
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jmp .loop
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cli
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@ -112,9 +91,4 @@ isr_return:
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%include "chario.asm"
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%include "printf.inc"
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%include "print.asm"
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%include "debug.asm"
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align 512
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