Import backup from 2003-08-16

bootdef.inc

@@ -15,7 +15,7 @@
 %define BOOT_VESA	0x0002		;2 - 0 for console, otherwise VESA mode
 %define BOOT_VESA_OEM	0x0004		;258 - null-terminated OEM identification string
 %define BOOT_VESA_VBE	0x0106		;512 - copy of VESA VBEInfoBlock
-%define	BOOT_		0x0306
+;%define	BOOT_		0x0306
 
 
 

idt.inc

@@ -1,6 +1,6 @@
 
 idtr:
-	dw	49*8-1		;size of idt
+	dw	50*8-1		;size of idt
 	dd	IDT		;address of idt
 
 

kernel.asm

@@ -23,7 +23,7 @@ copy_gdt:
 	mov	edi, IDT		;destination
 	mov	esi, isr_0		;address of isr0
 	mov	edx, isr_1-isr_0	;distance between isr labels
-	mov	ecx, 49			;number of isrlabels
+	mov	ecx, 50			;number of isrlabels
 fill_idt:
 	mov	ebx, esi
 	mov	ax, si

kernel.c

@@ -27,7 +27,7 @@ void isr(int num)
 	{
 		(*(char*)0xB8000)++;
 		*(char*)0xB8001 = 7;
-	}
 		eoi();
+	}
 }
 

stage2.asm

@@ -1,6 +1,10 @@
 
 %include "bootdef.inc"
 
+%define VESA_MODEINFO_SEG 0x0120
+%define VESA_MODELIST_SEG 0x0140
+%define GOOD_MODELIST_SEG 0x0160
+
 [bits 16]
 
 org BOOT_STAGE2_ADD
@@ -286,6 +290,98 @@ vesa_copyvbe:
 	mov	si, dx
 	shr	edx, 16
 	mov	ds, dx				;ds:si points to video mode list
+	mov	ax, GOOD_MODELIST_SEG
+	mov	es, ax
+	xor	di, di
+vesa_copymodes:
+	lodsw
+	stosw
+	cmp	ax, 0xffff
+	jnz	vesa_copymodes
+
+	mov	ax, GOOD_MODELIST_SEG
+	mov	es, ax
+	xor	di, di
+	mov	cx, 256
+	mov	ax, 0xffff
+clear_good_mode_list_loop:
+	stosw
+	loop	clear_good_mode_list_loop
+
+	mov	ax, VESA_MODELIST_SEG
+	mov	ds, ax
+	xor	si, si				;ds:si points to video mode list where we can edit it :)
+	xor	dx, dx				;dx=what good mode # we are on
+vesa_readmodeinfo_loop:
+	mov	ax, VESA_MODEINFO_SEG
+	mov	es, ax
+	xor	di, di
+	lodsw
+	cmp	ax, 0xffff
+	jnz	vesa_notendofmodes
+	jmp	vesa_endofmodes
+vesa_notendofmodes:
+	mov	cx, ax
+	mov	ax, 0x4F01
+	int	0x10
+	call	checkvesa
+	xor	di, di				;es:di -> ModeInfoBlock struc, ds:si -> video mode list
+	mov	ax, [es:di]			;ModeAttributes
+	test	al, 1				;mode supported
+	jz	vesa_modenogood
+	test	al, 8				;color mode
+	jz	vesa_modenogood
+	test	al, 0x10			;graphics mode
+	jz	vesa_modenogood
+	mov	ax, [es:di+18]			;XResolution
+	mov	bx, [es:di+20]			;YResolution
+	cmp	ax, 640				;640x480
+	jnz	res_goon1
+	cmp	bx, 480
+	jnz	vesa_modenogood
+	jmp	vesa_modegood
+res_goon1:
+	cmp	ax, 800
+	jnz	res_goon2
+	cmp	bx, 600
+	jnz	vesa_modenogood
+	jmp	vesa_modegood
+res_goon2:
+	cmp	ax, 1024
+	jnz	res_goon3
+	cmp	bx, 768
+	jnz	vesa_modenogood
+	jmp	vesa_modegood
+res_goon3:
+	cmp	ax, 1280
+	jnz	res_goon4
+	cmp	bx, 1024
+	jz	vesa_modegood
+	cmp	bx, 960
+	jz	vesa_modegood
+	jmp	vesa_modenogood
+res_goon4:
+	cmp	ax, 1600
+	jnz	vesa_modenogood
+	cmp	bx, 1200
+	jnz	vesa_modenogood
+vesa_modegood:
+	mov	ax, 0xb800
+	mov	es, ax
+	mov	ax, 160
+	push	dx
+	mul	dx				;ax=160*#ofgoodmode
+	pop	dx
+	add	ax, 160*2
+	
+
+
+	jmp	vesa_readmodeinfo_loop
+vesa_modenogood:
+	mov	word	[ds:si], 0
+	jmp	vesa_readmodeinfo_loop
+
+vesa_endofmodes:
 
 
 
@@ -358,6 +454,7 @@ puthex_goon2:
 	pop	ax
 	ret
 
+;------------------------------------------------------
 puthex2:
 	;es:di points to video memory, always displays 2 characters!
 	;al holds hex value