diff options
| author | manzerbredes <loic.guegan_secondary@yahoo.fr> | 2015-07-18 10:23:36 +0400 |
|---|---|---|
| committer | manzerbredes <loic.guegan_secondary@yahoo.fr> | 2015-07-18 10:23:36 +0400 |
| commit | 9d2b511fd521fc61ed2eb6f0fc5ed23252ac3190 (patch) | |
| tree | 2b74dd0c8bd575f009c1e255bc133ca84e0be674 | |
| parent | 707d7e38b6c3da23e99e9cbf9ad3c0cd27459c90 (diff) | |
Add some bios routines
| -rw-r--r-- | bootloader/Makefile | 2 | ||||
| -rw-r--r-- | bootloader/bootloader.asm | 9 | ||||
| -rw-r--r-- | bootloader/clearScreenIntBios.asm | 30 | ||||
| -rw-r--r-- | bootloader/resetCursorPosIntBios.asm | 21 |
4 files changed, 61 insertions, 1 deletions
diff --git a/bootloader/Makefile b/bootloader/Makefile index 9cb2ec5..5f252ed 100644 --- a/bootloader/Makefile +++ b/bootloader/Makefile @@ -2,7 +2,7 @@ bootloader.bin: bootloader.asm - nasm -f bin -o $@ $^ + nasm -f bin -o $@ $< clean: rm bootloader.bin diff --git a/bootloader/bootloader.asm b/bootloader/bootloader.asm index 8baeca7..db80946 100644 --- a/bootloader/bootloader.asm +++ b/bootloader/bootloader.asm @@ -4,14 +4,23 @@ ;Save the first adress with a label to complete the MBR at the end. start: + ;Init CPU registers mov ax, 0x0C70 ;Put bootloader adress in ax register mov ds, ax ;Init data segment +mov ax, 0x8000 +mov ss, ax +mov ax, 0xf000 +mov sp, ax + +call clearScreenIntBios ;Pause here ! infiniteLoop: jmp infiniteLoop +%include "clearScreenIntBios.asm" + ;Complete the MBR with nothing times 510 - ($ - start) db 0x0 diff --git a/bootloader/clearScreenIntBios.asm b/bootloader/clearScreenIntBios.asm new file mode 100644 index 0000000..4739430 --- /dev/null +++ b/bootloader/clearScreenIntBios.asm @@ -0,0 +1,30 @@ +clearScreenIntBios: + + ;Save registers + push ax + push bx + push cx + push dx + + mov ax, 0x0600 ;Clear + mov bx, 0x0F00 ;Color black behind white foreground + + mov cx, 0x0000 ;Top left corner + mov dx, 0x5050 ;Bottom right corner 80x80 + + int 0x10 ;Clear the screen + + ;Restore registers + pop dx + pop cx + pop bx + pop ax + + ;Reset Cursor Position + call resetCursorPosIntBios + + ;Back to previous task + ret + +;Include resetCursorPosIntBios +%include "resetCursorPosIntBios.asm" diff --git a/bootloader/resetCursorPosIntBios.asm b/bootloader/resetCursorPosIntBios.asm new file mode 100644 index 0000000..18cb0d2 --- /dev/null +++ b/bootloader/resetCursorPosIntBios.asm @@ -0,0 +1,21 @@ +resetCursorPosIntBios: + + ;Save registers + push ax + push bx + push dx + + mov ax, 0x0200 ;Move cursor interrupt + mov bx, 0x0000 ; X position + mov dx, 0x0000 ; Y Position + + ;Call 0x10 interrupt service + int 0x10 + + ;Restore registers + pop dx + pop bx + pop ax + + ;Back to previous task + ret |