Import backup from 2004-12-17

rmmod/rmmod.asm

@@ -14,7 +14,6 @@
 
 ; ebx = return address
 ; ecx = where to store real mode parameter table
-; edx = initrd, where to put ram disk
 start:
 	jmp	0:start_refreshed
 start_refreshed:
@@ -24,81 +23,28 @@ start_refreshed:
 	mov	ss, ax
 	mov	esp, 0x7000
 	mov	[dat_rmadd], ecx
-	mov	[dat_initrd], edx
 	mov	[dat_retn], ebx
 
-	sti
-	mov	ah, 0				;reset floppy controller
-	mov	dl, 0
-	int	0x13
 
-;	xor	ax, ax
-;	int	0x16
 
-;	push	txt_loading_initrd		;print loading initrd string
-;	push	23*80
-;	call	putString
-;	add	sp, 4
+	mov	ebx, [dat_retn]
+	lgdt	[gdtrbs32]
+	mov	eax, cr0
+	or	eax, 0x01
+	mov	cr0, eax
+	jmp	KERNEL_CODE_BS32:segmented_start
+[bits 32]
+segmented_start:
+	mov	cx, KERNEL_DATA_BS32
+	mov	ss, cx
+	mov	ds, cx
+	mov	es, cx
+	mov	gs, cx
+	mov	fs, cx
+	jmp	ebx
 
-;	push	es				; draw a red bar to fill in
-;	mov	ax, 0xb800
-;	mov	es, ax
-;	mov	di, 24*160
-;	mov	cx, 80
-;	mov	ax, 0x04B0
-;	rep	stosw
-;	pop	es
-
-	mov	cx, 80				;80 cylinders to read
-	xor	si, si                          ;start at cylinder 0
-	mov	edi, [dat_initrd]		;ram disk address
-read_cylinder:
-	push	cx
-	
-	mov	bx, 0x1000			;read sectors from head 0
-	mov	es, bx
-	xor	bx, bx				;es:bx = data buffer for read
-	mov	ax, 0x0212			;ah = int 0x13 function 2, al = number of sectors to read
-	mov	cx, si				;what cyl. we are on is now in cx
-	mov	ch, cl				;ch = cyl. number
-	mov	cl, 1				;cl = sector number 1-63
-	xor	dx, dx				;dh = head number
-;	mov	dl, 0				;dl = drive number
-	int	0x13
-
-	mov	bx, 0x1000			;now read sectors from head 1
-	mov	es, bx
-	mov	bx, 9216			;es:bx = data buffer for read
-	mov	ax, 0x0212			;ah = int 0x13 function 2, al = number of sectors to read
-	mov	cx, si				;what cyl. we are on is now in cx
-	mov	ch, cl				;ch = cyl. number
-	mov	cl, 1				;cl = sector number 1-63
-;	mov	dh, 1				;dh = head number
-;	mov	dl, 0				;dl = drive number
-	mov	dx, 0x0100
-	int	0x13
-
-	mov	ebx, 0xb8000			;draw a green block
-	add	bx, si
-	shl	bl, 1
-	mov	word [ds:ebx+160*24], 0x0200+219
-
-	push	si
-	mov	esi, 0x10000			;now copy the disk up to where we will keep it
-	mov	cx, 0x2400
-;	rep o32 movsb
-
-	pop	si				;what cylinder# we are on...
-	inc	si
-	pop	cx
-;	loop	read_cylinder
-
-	xor	ax, ax
-	int	0x16
-
-	mov	al, 0xfe
-	out	0x64, al			;reboot
 
+[bits 16]
 ; putString(int position, char *str)
 putString:
 	push	bp
@@ -137,7 +83,38 @@ putString_loop_done:
 	pop	bp
 	ret
 
-txt_loading_initrd:	db	"Loading initrd...     ", 0
+;-------------------------------------------------------
+gdtrbs32:
+	dw	gdt_endbs32-gdtbs32-1
+	dd	gdtbs32
+gdtbs32:				;null descriptor
+	dd	0
+	dd	0
+
+	;a base of 0x4000_0000, when added to 0xC000_0000 will produce 0x0000_0000 physical before paging in effect
+KERNEL_CODE_BS32 equ $-gdtbs32
+	db	0xff		;limit	7:0
+	db	0xff		;limit	15:8
+	db	0x00		;base	7:0
+	db	0x00		;base	15:8
+	db	0x00		;base	23:16
+	db	0x9a		;access
+	db	0xcf		;flags / limit 19:16
+	db	0x40		;base	31:24
+
+KERNEL_DATA_BS32 equ $-gdtbs32
+	db	0xff		;limit	7:0
+	db	0xff		;limit	15:8
+	db	0x00		;base	7:0
+	db	0x00		;base	15:8
+	db	0x00		;base	23:16
+	db	0x92		;access
+	db	0xcf		;flags / limit 19:16
+	db	0x40		;base	31:24
+
+gdt_endbs32:
+
+
 dat_rmadd		dd	0
 dat_initrd		dd	0
 dat_retn		dd	0