[Xen-changelog] Eliminate hard coded items from i386 __xen_guest section

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID c93c6b392ce54e1f6e6b95529a90741b6b8b41e1
# Parent  946a45f07351a4ed399f96eb3d6867bfa28af6a2
Eliminate hard coded items from i386 __xen_guest section
to allow the new VMSPLIT_* Kconfig options to work, and to
avoid problems when the position of the hypercall page
changes.

From: Jan Beulich <JBeulich@xxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 946a45f07351 -r c93c6b392ce5 
linux-2.6-xen-sparse/arch/i386/kernel/head-xen.S
--- a/linux-2.6-xen-sparse/arch/i386/kernel/head-xen.S  Mon Feb 20 15:18:38 2006
+++ b/linux-2.6-xen-sparse/arch/i386/kernel/head-xen.S  Mon Feb 20 16:08:27 2006
@@ -1,23 +1,11 @@
 
+
+.text
 #include <linux/config.h>
-
-.section __xen_guest
-       .ascii  "GUEST_OS=linux,GUEST_VER=2.6"
-       .ascii  ",XEN_VER=xen-3.0"
-       .ascii  ",VIRT_BASE=0xC0000000"
-       .ascii  ",HYPERCALL_PAGE=0x104" /* __pa(hypercall_page) >> 12 */
-#ifdef CONFIG_X86_PAE
-       .ascii  ",PAE=yes"
-#else
-       .ascii  ",PAE=no"
-#endif
-       .ascii  ",LOADER=generic"
-       .byte   0
-
-.text
 #include <linux/threads.h>
 #include <linux/linkage.h>
 #include <asm/segment.h>
+#include <asm/page.h>
 #include <asm/thread_info.h>
 #include <asm/asm-offsets.h>
 #include <xen/interface/arch-x86_32.h>
@@ -190,12 +178,47 @@
 .org 0x3000
 ENTRY(default_ldt)
 
-.org 0x4000
+#define HYPERCALL_PAGE_OFFSET 0x4000
+.org HYPERCALL_PAGE_OFFSET
 ENTRY(hypercall_page)
-
-.org 0x5000
+.skip 0x1000
+
 /*
  * Real beginning of normal "text" segment
  */
 ENTRY(stext)
 ENTRY(_stext)
+
+
+/*
+ * __xen_guest information
+ */
+.macro bigutoa value
+       utoa (\value) >> 12
+       .ascii "000"
+.endm
+.macro utoa value
+ .if (\value) >= 16
+       utoa (\value) >> 4
+ .endif
+ .if (\value) % 16 < 10
+  .byte '0' + (\value) % 16
+ .else
+  .byte 'A' + (\value) % 16 - 10
+ .endif
+.endm
+
+.section __xen_guest
+       .ascii  "GUEST_OS=linux,GUEST_VER=2.6"
+       .ascii  ",XEN_VER=xen-3.0"
+       .ascii  ",VIRT_BASE=0x"
+                bigutoa __PAGE_OFFSET
+       .ascii  ",HYPERCALL_PAGE=0x"
+               utoa ((__PHYSICAL_START+HYPERCALL_PAGE_OFFSET)>>PAGE_SHIFT)
+#ifdef CONFIG_X86_PAE
+       .ascii  ",PAE=yes"
+#else
+       .ascii  ",PAE=no"
+#endif
+       .ascii  ",LOADER=generic"
+       .byte   0

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