Add 01h and 02h for DOSAPI

This commit is contained in:
Nero 2019-04-14 19:35:55 +00:00
parent 4b9d6da85c
commit 0094ee6b95
3 changed files with 74 additions and 28 deletions

19
kernel/dosapi.asm Normal file
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@ -0,0 +1,19 @@
isr_dosmain:
cmp ah, 0x01
je isr_getc_echo
cmp ah, 0x02
je isr_putc
iret
isr_getc_echo:
mov ah, 0x00
int 0x16
cmp al, 0x00
je isr_getc_echo
iret
isr_putc:
mov al, dl
call kputc
iret

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@ -1,22 +1,39 @@
; Data table for interrupts ; Data table for interrupts
; cs:word for service routine ; cs:word for service routine
intr_table: intr_table0:
dw iret ; 0 Divide by Zero dw iret ; 00 Divide by Zero
dw iret ; 1 Single Step dw iret ; 01 Single Step
dw iret ; 2 Parity error routine (NMI) dw iret ; 02 Parity error routine (NMI)
dw debug_reg_ir ; 3 Break dw debug_reg_ir ; 03 Break
dw iret ; 4 Overflow dw iret ; 04 Overflow
dw iret ; 5 Print Screen dw iret ; 05 Print Screen
dw iret ; 6 Mouse button control dw iret ; 06 Mouse button control
dw iret ; 7 Reserved dw isr_dosmain ; 07 Reserved
dw irq0 ; 8 System Clock interrupt dw irq0 ; 08 System Clock interrupt
dw irq1 ; 9 Keyboard interrupt dw irq1 ; 09 Keyboard interrupt
dw irq2 ; 10 RTC interrupt dw irq2 ; 0a RTC interrupt
dw irq3 ; 11 COMMS dw irq3 ; 0b COMMS
dw irq4 ; 12 COMMS dw irq4 ; 0c COMMS
dw irq5 ; 13 Hard Disk dw irq5 ; 0d Hard Disk
dw irq6 ; 14 Floppy Disk interrupt routine dw irq6 ; 0e Floppy Disk interrupt routine
dw irq7 ; 15 Printer interrupt dw irq7 ; 0f Printer interrupt
intr_table2:
dw iret ; 20
dw isr_dosmain ; 21
dw iret ; 22
dw iret ; 23
dw iret ; 24
dw iret ; 25
dw iret ; 26
dw iret ; 27
dw iret ; 28
dw iret ; 29
dw iret ; 2a
dw iret ; 2b
dw iret ; 2c
dw iret ; 2d
dw iret ; 2e
dw iret ; 2f
; LSB is IRQ0, MSB is IRQ16 ; LSB is IRQ0, MSB is IRQ16
; A IRQ will set their bit to 1, so userspace may poll it via wait_irq ; A IRQ will set their bit to 1, so userspace may poll it via wait_irq
@ -34,17 +51,26 @@ intr_init:
mov di, 0x0100 ; write to offset of int 0x40 address mov di, 0x0100 ; write to offset of int 0x40 address
mov cx, 0x0020 ; 0x10 vectors, segment:offset each mov cx, 0x0020 ; 0x10 vectors, segment:offset each
repe movsw repe movsw
; now setup our own handlers ; now setup our own handlers (0x0n)
mov ax, cs mov ax, cs
mov ds, ax ; read from local segment mov ds, ax ; read from local segment
mov si, intr_table ; read from intr_table mov si, intr_table0 ; read from intr_table
mov di, 0x0000 ; write to start of IVT table mov di, 0x0000 ; write to start of IVT table
mov cx, 0x0010 ; 0x10 vectors, one offset each mov cx, 0x0010 ; 0x10 vectors, one offset each
.loop: .loop0:
movsw ; read offset, write offset movsw ; read offset; write offset
mov ax,cs mov ax,cs
stosw ; write segment stosw ; write segment
loop .loop loop .loop0
; second vector block (0x2n)
mov si, intr_table2 ; read from intr_table
mov di, 0x0080 ; write to int 20h vector and above
mov cx, 0x0010 ; 0x10 vectors, one offset each
.loop2:
movsw ; read offset; write offset
mov ax,cs
stosw ; write segment
loop .loop2
pop es pop es
pop ds pop ds
ret ret
@ -57,11 +83,6 @@ irq0:
irq1: irq1:
int 0x49 int 0x49
or byte [intr_flip], 0x02 or byte [intr_flip], 0x02
push ax
mov ax, [intr_flip]
call kprint8
mov word [intr_flip], 0x0000
pop ax
jmp irqret jmp irqret
irq2: irq2:

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@ -14,15 +14,21 @@ main:
int 3 int 3
mov ah, 0x01
int 0x21
mov dl, al
mov ah, 0x02
int 0x21
sti sti
.halt: .halt:
hlt hlt
jmp .halt jmp .halt
%include "heap.asm"
%include "intr.asm" %include "intr.asm"
%include "debug.asm" %include "debug.asm"
%include "kprintf.asm" %include "kprintf.asm"
%include "dosapi.asm"
_reloc_end: _reloc_end: