[Xen-changelog] [xen-unstable] x86: Allow BOOT_TRAMPOLINE to be changed without needing manual

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

# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1193035465 -3600
# Node ID 3b481059a54d363e914d86fb78850475ff9ce56e
# Parent  7231d971f78c5771655df44eb3a69837de0b701d
x86: Allow BOOT_TRAMPOLINE to be changed without needing manual
modification of the trampoline GDT. Adjust trampoline base to
0x94000.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 xen/arch/x86/boot/trampoline.S |   23 ++++++++++++++++-------
 xen/include/asm-x86/config.h   |    2 +-
 2 files changed, 17 insertions(+), 8 deletions(-)

diff -r 7231d971f78c -r 3b481059a54d xen/arch/x86/boot/trampoline.S
--- a/xen/arch/x86/boot/trampoline.S    Sat Oct 20 09:30:00 2007 +0100
+++ b/xen/arch/x86/boot/trampoline.S    Mon Oct 22 07:44:25 2007 +0100
@@ -22,13 +22,22 @@ idt_48: .word   0, 0, 0 # base = limit =
 idt_48: .word   0, 0, 0 # base = limit = 0
 gdt_48: .word   6*8-1
         .long   bootsym_phys(trampoline_gdt)
+        .align  8
 trampoline_gdt:
-        .quad   0x0000000000000000     /* 0x0000: unused */
-        .quad   0x00cf9a000000ffff     /* 0x0008: ring 0 code, 32-bit mode */
-        .quad   0x00af9a000000ffff     /* 0x0010: ring 0 code, 64-bit mode */
-        .quad   0x00cf92000000ffff     /* 0x0018: ring 0 data */
-        .quad   0x00009a090000ffff     /* 0x0020: real-mode code @ 0x90000 */
-        .quad   0x000092090000ffff     /* 0x0028: real-mode data @ 0x90000 */
+        /* 0x0000: unused */
+        .quad   0x0000000000000000
+        /* 0x0008: ring 0 code, 32-bit mode */
+        .quad   0x00cf9a000000ffff
+        /* 0x0010: ring 0 code, 64-bit mode */
+        .quad   0x00af9a000000ffff
+        /* 0x0018: ring 0 data */
+        .quad   0x00cf92000000ffff
+        /* 0x0020: real-mode code @ BOOT_TRAMPOLINE */
+        .long   0x0000ffff | ((BOOT_TRAMPOLINE & 0x00ffff) << 16)
+        .long   0x00009a00 | ((BOOT_TRAMPOLINE & 0xff0000) >> 16)
+        /* 0x0028: real-mode data @ BOOT_TRAMPOLINE */
+        .long   0x0000ffff | ((BOOT_TRAMPOLINE & 0x00ffff) << 16)
+        .long   0x00009200 | ((BOOT_TRAMPOLINE & 0xff0000) >> 16)
 
 cpuid_ext_features:
         .long   0
@@ -142,7 +151,7 @@ 1:      mov     $(BOOT_TRAMPOLINE>>4),%a
         mov     %ax,%es
         mov     %ax,%ss
 
-        /* Stack grows down from 0x93000. Initialise IDT and enable irqs. */
+        /* Stack grows down from +0x3000. Initialise IDT and enable irqs. */
         mov     $0x3000,%sp
         lidt    bootsym(rm_idt)
         sti
diff -r 7231d971f78c -r 3b481059a54d xen/include/asm-x86/config.h
--- a/xen/include/asm-x86/config.h      Sat Oct 20 09:30:00 2007 +0100
+++ b/xen/include/asm-x86/config.h      Mon Oct 22 07:44:25 2007 +0100
@@ -93,7 +93,7 @@
 
 #define CONFIG_DMA_BITSIZE 32
 
-#define BOOT_TRAMPOLINE 0x90000
+#define BOOT_TRAMPOLINE 0x94000
 #define bootsym_phys(sym)                                 \
     (((unsigned long)&(sym)-(unsigned long)&trampoline_start)+BOOT_TRAMPOLINE)
 #define bootsym(sym)                                      \

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