Merge ../torvalds-2.6/

1 files changed, 17 insertions, 10 deletions

diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index e437fb367498..5884469f6bfe 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -504,19 +504,24 @@ ENTRY(cpu_gdt_table)
         .quad 0x0000000000000000        /* 0x80 TSS descriptor */
         .quad 0x0000000000000000        /* 0x88 LDT descriptor */
 
-        /* Segments used for calling PnP BIOS */
-        .quad 0x00c09a0000000000        /* 0x90 32-bit code */
-        .quad 0x00809a0000000000        /* 0x98 16-bit code */
-        .quad 0x0080920000000000        /* 0xa0 16-bit data */
-        .quad 0x0080920000000000        /* 0xa8 16-bit data */
-        .quad 0x0080920000000000        /* 0xb0 16-bit data */
+        /*
+         * Segments used for calling PnP BIOS have byte granularity.
+         * They code segments and data segments have fixed 64k limits,
+         * the transfer segment sizes are set at run time.
+         */
+        .quad 0x00409a000000ffff        /* 0x90 32-bit code */
+        .quad 0x00009a000000ffff        /* 0x98 16-bit code */
+        .quad 0x000092000000ffff        /* 0xa0 16-bit data */
+        .quad 0x0000920000000000        /* 0xa8 16-bit data */
+        .quad 0x0000920000000000        /* 0xb0 16-bit data */
+
         /*
          * The APM segments have byte granularity and their bases
-         * and limits are set at run time.
+         * are set at run time.  All have 64k limits.
          */
-        .quad 0x00409a0000000000        /* 0xb8 APM CS    code */
-        .quad 0x00009a0000000000        /* 0xc0 APM CS 16 code (16 bit) */
-        .quad 0x0040920000000000        /* 0xc8 APM DS    data */
+        .quad 0x00409a000000ffff        /* 0xb8 APM CS    code */
+        .quad 0x00009a000000ffff        /* 0xc0 APM CS 16 code (16 bit) */
+        .quad 0x004092000000ffff        /* 0xc8 APM DS    data */
 
         .quad 0x0000920000000000        /* 0xd0 - ESPFIX 16-bit SS */
         .quad 0x0000000000000000        /* 0xd8 - unused */
@@ -525,3 +530,5 @@ ENTRY(cpu_gdt_table)
         .quad 0x0000000000000000        /* 0xf0 - unused */
         .quad 0x0000000000000000        /* 0xf8 - GDT entry 31: double-fault TSS */
 
+        /* Be sure this is zeroed to avoid false validations in Xen */
+        .fill PAGE_SIZE_asm / 8 - GDT_ENTRIES,8,0