1 files changed, 47 insertions, 0 deletions
diff --git a/boot/vesa_setup_16.asm b/boot/vesa_setup_16.asm
new file mode 100644
index 0000000..4f276b5
--- /dev/null
+++ b/boot/vesa_setup_16.asm
@@ -0,0 +1,47 @@
+VesaSetup:
+    
+    pusha
+
+    ;VESA: get all available vesa modes!
+    mov ax,0	; set target address in es:di (0:offset)
+    mov es,ax
+    mov di,VESA_MODES
+    mov ax,0x4f00   ;vesa function: Get Controller Info
+    int 0x10	; call the interrupt to get the data from the bios!
+    vesa_err:
+    mov bx, VESA_CHECK1
+    call print_string
+    cmp ax,0x004f
+    je vesa_ok
+    jmp vesa_err
+    vesa_ok:
+    ;
+
+    ;VESA: get vesa info on mode of interest
+    mov ax,0	; set target address in es:di (0:offset)
+    mov es,ax
+    mov di,VESA_MODE_INFO
+    mov ax,0x4f01   ;vesa function: Get Mode Info
+    mov cx,VESA_MODE_SELECT   
+    int 0x10	; call the interrupt to get the data from the bios!
+    vesa_err2:
+    mov bx, VESA_CHECK2
+    call print_string
+    cmp ax,0x004f
+    je vesa_ok2
+    jmp vesa_err2
+    vesa_ok2:
+
+    ;VESA: finally switch to the mode of choice!
+    mov ax,0x4f02   ;vesa function: Set Mode
+    mov bx,VESA_MODE_SELECT 
+    int 0x10
+    vesa_err3:
+    mov bx, VESA_CHECK3
+    call print_string
+    cmp ax,0x004f
+    je vesa_ok3
+    jmp vesa_err3
+    vesa_ok3:
+    popa
+    ret