Add print routine

2 files changed, 35 insertions, 1 deletions

diff --git a/bootloader/bootloader.asm b/bootloader/bootloader.asm
index ee11e2c..f1bb48a 100644
--- a/bootloader/bootloader.asm
+++ b/bootloader/bootloader.asm
@@ -7,10 +7,11 @@ start:
 ;Include bios routines and jump to skip including code
 jmp skipInc
 %include "clearScreenIntBios.asm"
+%include "printIntBios.asm"
 skipInc:
 
 ;Init CPU registers
-mov ax, 0x0C70	;Put bootloader adress in ax register
+mov ax, 0x07C0	;Put bootloader adress in ax register
 mov ds, ax	;Init data segment
 
 ;Init stack from 0x80000 to 0x8f000
@@ -22,10 +23,16 @@ mov sp, ax	;Set stack offset
 ;Clear the screen
 call clearScreenIntBios
 
+;Print msg
+mov si, helloBootloader ;load msg in si register
+call printIntBios	;print the msg
+
 ;Pause here !
 infiniteLoop:
 	jmp infiniteLoop
 
+;Define data
+helloBootloader db "PiegOS bootloader successfully running !", 0
 
 ;Complete the MBR with nothing
 times 510 - ($ - start) db 0x0
diff --git a/bootloader/printIntBios.asm b/bootloader/printIntBios.asm
new file mode 100644
index 0000000..2a6c735
--- /dev/null
+++ b/bootloader/printIntBios.asm
@@ -0,0 +1,27 @@
+printIntBios:
+
+	;Save registers
+	push ax
+	push bx
+
+	;Print loop
+	.loop:
+
+		mov ah, 0x0E	;Use 0xE bios service for teletype print
+		lodsb		;Load char in al and inc SI register
+		cmp al, 0x0	;Check if we print all the chain
+		je .end		;If yes go to end
+
+		mov bl, 0x0F	;Else set color register
+
+		int 0x10	;And print the character
+
+		jmp .loop	;Go to the next character
+	.end:
+
+	;Restore registers
+	pop bx
+	pop ax
+
+	;Back to previous task
+	ret