Add 01h and 02h for DOSAPI

kernel/dosapi.asm

@@ -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

kernel/intr.asm

@@ -1,22 +1,39 @@
 ; Data table for interrupts
 ; cs:word for service routine
-intr_table:
-  dw iret ;  0 Divide by Zero
-  dw iret ;  1 Single Step
-  dw iret ;  2 Parity error routine (NMI)
-  dw debug_reg_ir ;  3 Break
-  dw iret ;  4 Overflow
-  dw iret ;  5 Print Screen
-  dw iret ;  6 Mouse button control
-  dw iret ;  7 Reserved
-  dw irq0 ;  8 System Clock interrupt
-  dw irq1 ;  9 Keyboard interrupt
-  dw irq2 ; 10 RTC interrupt
-  dw irq3 ; 11 COMMS
-  dw irq4 ; 12 COMMS
-  dw irq5 ; 13 Hard Disk
-  dw irq6 ; 14 Floppy Disk interrupt routine
-  dw irq7 ; 15 Printer interrupt
+intr_table0:
+  dw iret ; 00 Divide by Zero
+  dw iret ; 01 Single Step
+  dw iret ; 02 Parity error routine (NMI)
+  dw debug_reg_ir ; 03 Break
+  dw iret ; 04 Overflow
+  dw iret ; 05 Print Screen
+  dw iret ; 06 Mouse button control
+  dw isr_dosmain ; 07 Reserved
+  dw irq0 ; 08 System Clock interrupt
+  dw irq1 ; 09 Keyboard interrupt
+  dw irq2 ; 0a RTC interrupt
+  dw irq3 ; 0b COMMS
+  dw irq4 ; 0c COMMS
+  dw irq5 ; 0d Hard Disk
+  dw irq6 ; 0e Floppy Disk interrupt routine
+  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
 ; 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 cx, 0x0020 ; 0x10 vectors, segment:offset each
   repe movsw
-  ; now setup our own handlers
+  ; now setup our own handlers (0x0n)
   mov ax, cs
   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 cx, 0x0010 ; 0x10 vectors, one offset each
-.loop:
-  movsw ; read offset, write offset
+.loop0:
+  movsw ; read offset; write offset
   mov ax,cs
   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 ds
   ret
@@ -57,11 +83,6 @@ irq0:
 irq1:
   int 0x49
   or byte [intr_flip], 0x02
-  push ax
-  mov ax, [intr_flip]
-  call kprint8
-  mov word [intr_flip], 0x0000
-  pop ax
   jmp irqret
 
 irq2:

kernel/main.asm

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