Xbox 360 Backward Compatibility - Revision history

XENON: Just added some clarity and fixed a typo

2022-06-22T12:51:16Z

Just added some clarity and fixed a typo

Chipsnapper: changed Symantec link to archive.org, pdf file has been removed

2020-04-07T22:06:18Z

changed Symantec link to archive.org, pdf file has been removed

JayFoxRox: /* References and links */

2019-03-21T13:46:37Z

‎References and links

JayFoxRox at 17:56, 24 January 2018

2018-01-24T17:56:39Z

JayFoxRox: /* Modifications to xboxkrnl.exe */

2017-05-30T01:35:09Z

‎Modifications to xboxkrnl.exe

JayFoxRox: /* Guest to host communication */

2017-05-30T01:34:09Z

‎Guest to host communication

JayFoxRox: /* Guest to host communication */

2017-05-30T01:09:05Z

‎Guest to host communication

JayFoxRox at 00:50, 30 May 2017

2017-05-30T00:50:46Z

JayFoxRox at 00:50, 30 May 2017

2017-05-30T00:50:22Z

JayFoxRox: Created page with "Xbox 360 Backward Compatibility is Microsofts original Xbox emulator for the Xbox 360. == References and links == * [http://support.xbox.com/en-US/legacy-devices/original-con..."

2017-05-14T07:22:31Z

Created page with "Xbox 360 Backward Compatibility is Microsofts original Xbox emulator for the Xbox 360. == References and links == * [http://support.xbox.com/en-US/legacy-devices/original-con..."

New page

Xbox 360 Backward Compatibility is Microsofts original Xbox emulator for the Xbox 360.

== References and links ==
* [http://support.xbox.com/en-US/legacy-devices/original-console/play-original-games Official compatibility list by Microsoft]
* [http://michaelbrundage.com/project/xbox-360-emulator/ Michael Brundages page about the original Xbox emulator in the Xbox 360]
** [http://michaelbrundage.com/note/2005/05/15/xbox-360-emulator/ More information about the original Xbox emulator in the Xbox 360]

← Older revision		Revision as of 12:51, 22 June 2022
Line 1:		Line 1:
−	Xbox 360 Backward Compatibility is ~~Microsofts~~ original Xbox emulator for the Xbox 360.	+	Xbox 360 Backward Compatibility, also known as '''FU''' or '''Fusion''' is Microsoft's original Xbox emulator for the Xbox 360.

	The emulator binary is called xefu.xex. The first resource is xb1krnl which is a modified version of [[Kernel\|xboxkrnl.exe]].		The emulator binary is called xefu.xex. The first resource is xb1krnl which is a modified version of [[Kernel\|xboxkrnl.exe]].

@@ Line 27: / Line 27: @@
 </pre>
-According to [https://www.symantec.com/avcenter/reference/Virtual_Machine_Threats.pdf this document by symantec] (Page 5, Left-hand-side) the patterns <code>0F 3F x1 x2</code> and <code>0F C7 C8 y1 y2</code> are used for communication with the host.
+According to [https://web.archive.org/web/20070216172548/https://www.symantec.com/avcenter/reference/Virtual_Machine_Threats.pdf this document by symantec] (Page 5, Left-hand-side) the patterns <code>0F 3F x1 x2</code> and <code>0F C7 C8 y1 y2</code> are used for communication with the host.
 {| class="wikitable"

← Older revision		Revision as of 17:56, 24 January 2018
Line 95:		Line 95:
	* [http://michaelbrundage.com/project/xbox-360-emulator/ Michael Brundages page about the original Xbox emulator in the Xbox 360]		* [http://michaelbrundage.com/project/xbox-360-emulator/ Michael Brundages page about the original Xbox emulator in the Xbox 360]
	** [http://michaelbrundage.com/note/2005/05/15/xbox-360-emulator/ More information about the original Xbox emulator in the Xbox 360]		** [http://michaelbrundage.com/note/2005/05/15/xbox-360-emulator/ More information about the original Xbox emulator in the Xbox 360]
		+	* [https://www.youtube.com/watch?v=Da_ont-2AG0 Modern Vintage Gamer: Revisiting Original Xbox Backward Compatibility on the Xbox 360]

@@ Line 5: / Line 5: @@
 === Modifications to xboxkrnl.exe ===
-The IDEXPDTR section has been dropped, additionally the extra data from the MS-DOS header is gone.
+The IDEXPRDT section has been dropped, additionally the extra data from the MS-DOS header is gone.
 ==== Guest to host communication ====

@@ Line 46: / Line 46: @@
 | 0x04 || 0x50 || Seems to use eax (address) as parameter? " [3 elements]
 |-
-| 0x06 || 0x00 || Seems to use eax (address) and ecx (size) as parameter?
+| colspan="3" | Cleaner list starts here {{FIXME}}
 |-
-| 0x06 || 0x26 ||
+| 0x04 || 0x20 ||
 |-
-| 0x06 || 0x27 ||
+| 0x04 || 0x20 ||
 |-
-| 0x06 || 0x28 ||
+| 0x04 || 0x21 ||
 |-
-| 0x06 || 0x29 ||
+| 0x04 || 0x22 ||
 |-
-| 0x06 || 0x0B ||
+| 0x04 || 0x23 ||
 |}

@@ Line 93: / Line 93: @@
 == References and links ==
 * [http://support.xbox.com/en-US/legacy-devices/original-console/play-original-games Official compatibility list by Microsoft]
-* [http://michaelbrundage.com/project/xbox-360-emulator/ Michael Brundages page about the original Xbox emulator in the Xbox 360]
+* [http://michaelbrundage.com/project/xbox-360-emulator/ Michael Brundages (Microsoft) page about the original Xbox emulator in the Xbox 360]
 ** [http://michaelbrundage.com/note/2005/05/15/xbox-360-emulator/ More information about the original Xbox emulator in the Xbox 360]
 * [https://www.youtube.com/watch?v=Da_ont-2AG0 Modern Vintage Gamer: Revisiting Original Xbox Backward Compatibility on the Xbox 360]

@@ Line 32: / Line 32: @@
 ! x1 !! x2 !! Notes
 |-
-| 0x04 || 0x20 || Seems to use eax (address) as parameter?
+| 0x04 || 0x20 || Seems to use eax (address) as parameter? eax points to a zero terminated list of pointers into the kernel memory [7 elements]
 |-
-| 0x04 || 0x21 || Seems to use eax (address) as parameter?
+| 0x04 || 0x21 || Seems to use eax (address) as parameter? " [4 elements]
 |-
-| 0x04 || 0x22 || Seems to use eax (address) as parameter?
+| 0x04 || 0x22 || Seems to use eax (address) as parameter? Seems to be some call to that address?!
 |-
 | 0x04 || 0x23 || Seems to use eax (address) as parameter?
@@ Line 44: / Line 44: @@
 | 0x04 || 0x35 || Seems to use eax (address) as parameter?
 |-
-| 0x04 || 0x50 || Seems to use eax (address) as parameter?
+| 0x04 || 0x50 || Seems to use eax (address) as parameter? " [3 elements]
 |-
 | 0x06 || 0x00 || Seems to use eax (address) and ecx (size) as parameter?
@@ Line 58: / Line 58: @@
 | 0x06 || 0x0B ||
 |}
 == References and links ==

← Older revision		Revision as of 00:50, 30 May 2017
Line 1:		Line 1:
	Xbox 360 Backward Compatibility is Microsofts original Xbox emulator for the Xbox 360.		Xbox 360 Backward Compatibility is Microsofts original Xbox emulator for the Xbox 360.
		+
		+	The emulator binary is called xefu.xex. The first resource is xb1krnl which is a modified version of [[Kernel\|xboxkrnl.exe]].
		+
		+	=== Modifications to xboxkrnl.exe ===
		+
		+	The IDEXPDTR section has been dropped, additionally the extra data from the MS-DOS header is gone.
		+
		+	==== Guest to host communication ====
		+
		+	The entrypoint of the kernel looks like:
		+
		+	<pre>
		+	80030878: 56 push %esi
		+	80030879: 57 push %edi
		+	8003087a: 8d 05 4c ac 02 80 lea 0x8002ac4c,%eax
		+	80030880: 0f 3f (bad)
		+	80030882: 04 20
		+	80030884: 8d 05 6c ac 02 80 lea 0x8002ac6c,%eax
		+	8003088a: 0f 3f (bad)
		+	8003088c: 04 20
		+	8003088e: 8d 05 8c ac 02 80 lea 0x8002ac8c,%eax
		+	80030894: 0f 3f (bad)
		+	80030896: 04 21
		+	80030898: 8d 05 70 94 01 80 lea 0x80019470,%eax
		+	...
		+	</pre>
		+
		+	According to [[https://www.symantec.com/avcenter/reference/Virtual_Machine_Threats.pdf this document by symantec]] (Page 5, Left-hand-side) the patterns <code>0F 3F x1 x2</code> and <code>0F C7 C8 y1 y2</code> are used for communication with the host.
		+
		+	{\| class="wikitable"
		+	! x1 !! x2 !! Notes
		+	\|-
		+	\| 0x04 \|\| 0x20 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x21 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x22 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x23 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x24 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x35 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x04 \|\| 0x50 \|\| Seems to use eax (address) as parameter?
		+	\|-
		+	\| 0x06 \|\| 0x00 \|\| Seems to use eax (address) and ecx (size) as parameter?
		+	\|-
		+	\| 0x06 \|\| 0x26 \|\|
		+	\|-
		+	\| 0x06 \|\| 0x27 \|\|
		+	\|-
		+	\| 0x06 \|\| 0x28 \|\|
		+	\|-
		+	\| 0x06 \|\| 0x29 \|\|
		+	\|-
		+	\| 0x06 \|\| 0x0B \|\|
		+	\|}
		+

	== References and links ==		== References and links ==