diff options
Diffstat (limited to 'kernel.asm')
| -rw-r--r-- | kernel.asm | 74 |
1 files changed, 62 insertions, 12 deletions
@@ -4,6 +4,7 @@ jmp kmain %include "constants.asm" %include "string.asm" +%include "isr.asm" %include "disk.asm" %include "console.asm" %include "stdio.asm" @@ -31,7 +32,11 @@ kmain: xor si, si xor bp, bp + mov dl, 0 ; select video page 0 + call console_set_video_page ; set video page + call cls ; clear console + push 0 ; home the cursor call setcursor add sp, 2 @@ -45,13 +50,17 @@ kmain: push ss push sp push ss + push kend + push cs push kmain push cs + push kend + push cs push kmain push cs - push msg_entry_point + push msg_entry_point_fmt call printf - add sp, 20 + add sp, 2 * 11 mov cx, 0ffh - 80h mov dx, 80h @@ -63,7 +72,10 @@ kmain: dec cx jne .extloop + + .mainloop: + call isr_inject call terminal jmp .mainloop @@ -72,6 +84,44 @@ kmain: jmp $ +isr_inject: + push bp + mov bp, sp + + push es + push ax + push bx + push bp + + mov ax, 0000h ; set ES to Interrupt Vector Table + ; (start of RAM) + mov es, ax + + mov bp, 20h * 4 ; Set vector (v = es:offset * 4)) + lea bx, [int22] ; Load address of ISR routine + mov ax, cs ; Load code segment into AX + + mov word [es:bp], bx ; Store address of ISR routine + mov word [es:bp+2], ax ; Store code segment of ISR routine + + push bx + push ax + push msg_isr_fmt + call printf ; print injected ISR address + add sp, 2 * 3 ; cleanup stack + + pop bp + pop bx + pop ax + pop es + + int 20h ; test new ISR + + mov sp, bp + pop bp + ret + + panic: ; Hang system with supplied error message push bp @@ -91,18 +141,18 @@ panic: ; data -banner: db "+========================+", CR - db "| Welcome to MINOS 0.0.1 |", CR - db "+========================+", CR - db CR, 0 +banner: db "+========================+", ASCII_CR + db "| Welcome to MINOS 0.0.1 |", ASCII_CR + db "+========================+", ASCII_CR + db ASCII_CR, 0 -msg_entry_point: db 'Kernel address: %x:%x (%d:%d)', CR - db 'Stack address : %x:%x (%d:%d)', CR - db 'Boot device : %x', CR, CR, 0 +msg_entry_point_fmt: db 'Kernel address: %x:%x - %x:%x (%d:%d - %d:%d)', ASCII_CR + db 'Stack address : %x:%x (%d:%d)', ASCII_CR + db 'Boot device : %x', ASCII_CR, ASCII_CR, 0 +msg_isr_fmt: db "ISR %x:%x", ASCII_CR, 0 ; Error messages error_msg_panic: db "PANIC: ", 0 -times (512 * 20h) - 2 db 0 ; Until we have a file system just reserve 32k of "free space" -dw 0xefbe ; The "BEEF" signature is a visual "end of kernel" - ; It has no meaning... +kend: dw 0xefbe ; The "BEEF" signature is a visual "end of kernel" +times (0200h * 20h) db 0 ; Until we have a file system just reserve 32k |