Import backup from 2004-12-20

rmmod/rmmod.asm

@@ -3,6 +3,8 @@
 ; Author: Josh Holtrop
 ; Date: 09/20/04
 
+%define VIRT_OFFSET 0xC0000000
+	
 ; the bootstrap process will jump us to 0x0:0x5010 so we'd better be ready for it
 [org 0x5000]
 [bits 16]
@@ -25,16 +27,22 @@ start_refreshed:
 	mov	[dat_rmadd], ecx
 	mov	[dat_retn], ebx
 
+; begin real-mode code initialization, etc...
 
 
+
+; get ready to go back to pmode and return to kernel initialization
 	mov	ebx, [dat_retn]
-	lgdt	[gdtrbs32]
+	lgdt	[gdtrlin32]
 	mov	eax, cr0
 	or	eax, 0x01
 	mov	cr0, eax
-	jmp	KERNEL_CODE_BS32:segmented_start
+	jmp	KERNEL_CODE_LIN32:segmented_start
 [bits 32]
 segmented_start:
+	lgdt	[gdtrbs32]
+	jmp	KERNEL_CODE_BS32:offset_continue+VIRT_OFFSET
+offset_continue:
 	mov	cx, KERNEL_DATA_BS32
 	mov	ss, cx
 	mov	ds, cx
@@ -83,6 +91,37 @@ putString_loop_done:
 	pop	bp
 	ret
 
+;-------------------------------------------------------
+gdtrlin32:
+	dw	gdt_endlin32-gdtlin32-1
+	dd	gdtlin32
+gdtlin32:				;null descriptor
+	dd	0
+	dd	0
+
+KERNEL_CODE_LIN32 equ $-gdtlin32
+	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	0x00		;base	31:24
+
+KERNEL_DATA_LIN32 equ $-gdtlin32
+	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	0x00		;base	31:24
+
+gdt_endlin32:
+
+	
 ;-------------------------------------------------------
 gdtrbs32:
 	dw	gdt_endbs32-gdtbs32-1