win4lin on Xen

["Tom Cranbrook" <tcranbrook@australia.edu>]

I think I'v tracked pretty much every thing down and that I can merge these
patches.  Will take some hand work, but .. so what.

I do have a questions about one thing in the include/asm--i386/segment.h
file.  This changes the layout of the per-CPU GDT rather substantually.  Is
this likely to poison Xen?

below in the relevant patch:


diff -auP linux-2.6.8.1/include/asm-i386/segment.h
linux-2.6.8.1-win4lin/include/asm-i386/segment.h
--- linux-2.6.8.1/include/asm-i386/segment.h	2004-08-14 06:55:09.000000000
-0400
+++ linux-2.6.8.1-win4lin/include/asm-i386/segment.h	2004-08-22
21:09:21.000000000 -0400
@@ -1,6 +1,93 @@
 #ifndef _ASM_SEGMENT_H
 #define _ASM_SEGMENT_H

+#ifdef CONFIG_MKI
+
+/*
+ * The layout of the per-CPU GDT under Linux with CONFIG_MKI:
+ *
+ *   0 - 0x000 - null
+ *   1 - 0x008 - reserved
+ *   2 - 0x010 - reserved
+ *   3 - 0x018 - reserved
+ *
+ *   4 - 0x020 - unused			<==== new cacheline
+ *   5 - 0x028 - unused
+ *
+ *  ------- start of TLS (Thread-Local Storage) segments:
+ *
+ *   6 - 0x030 - TLS segment #1	[ glibc's TLS segment ]
+ *   7 - 0x038 - TLS segment #2	[ Wine's %fs Win32 segment ]
+ *   8 - 0x040 - TLS segment #3
+ *   9 - 0x048 - reserved
+ *  10 - 0x050 - reserved
+ *  11 - 0x058 - reserved
+ *
+ *  12 - 0x060 
+ *     |	- reserved for MKI use
+ *     V
+ * 479 - 0xef8
+ *
+ *  ------- start of kernel segments:
+ * 484 - 0xf20 - kernel code segment	<==== new cacheline
+ * 485 - 0xf28 - kernel data segment
+ * 486 - 0xf30 - default user CS
+ * 487 - 0xf38 - default user DS
+ * 488 - 0xf40 - TSS
+ * 489 - 0xf48 - LDT
+ * 490 - 0xf50 - PNPBIOS support (16->32 gate)
+ * 491 - 0xf58 - PNPBIOS support
+ * 492 - 0xf60 - PNPBIOS support
+ * 493 - 0xf68 - PNPBIOS support
+ * 494 - 0xf78 - PNPBIOS support
+ * 495 - 0xf78 - APM BIOS support
+ * 496 - 0xf80 - APM BIOS support
+ * 497 - 0xf88 - APM BIOS support
+ * 498 - 0xf90 - unused
+ * 497 - 0xf98 - unused
+ * 498 - 0xfa0 - unused
+ * 499 - 0xfa8 - unused
+ * 500 - 0xfb0 - unused
+ * 501 - 0xfb8 - TSS for double fault handler
+ * 502 - 0xfc0 - unused
+ *     |       - unused
+ *     V       - unused
+ * 511 - 0xff8 - unused
+ */
+#define GDT_ENTRY_TLS_ENTRIES	3
+#define GDT_ENTRY_TLS_MIN	6
+#define GDT_ENTRY_TLS_MAX 	(GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
+
+#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
+
+#define GDT_ENTRY_DEFAULT_USER_CS	486
+#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3)
+
+#define GDT_ENTRY_DEFAULT_USER_DS	487
+#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3)
+
+#define GDT_ENTRY_KERNEL_BASE		484
+
+#define GDT_ENTRY_KERNEL_CS		(GDT_ENTRY_KERNEL_BASE + 0)
+#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
+
+#define GDT_ENTRY_KERNEL_DS		(GDT_ENTRY_KERNEL_BASE + 1)
+#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
+
+#define GDT_ENTRY_TSS			(GDT_ENTRY_KERNEL_BASE + 4)
+#define GDT_ENTRY_LDT			(GDT_ENTRY_KERNEL_BASE + 5)
+
+#define GDT_ENTRY_PNPBIOS_BASE		(GDT_ENTRY_KERNEL_BASE + 6)
+#define GDT_ENTRY_APMBIOS_BASE		(GDT_ENTRY_KERNEL_BASE + 11)
+
+#define GDT_ENTRY_DOUBLEFAULT_TSS	501
+
+/*
+ * The GDT has 512 entries
+ */
+#define GDT_ENTRIES 512
+
+#else /* !CONFIG_MKI */
 /*
  * The layout of the per-CPU GDT under Linux:
  *





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