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authorZachary Amsden <zach@vmware.com>2006-01-06 00:11:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:35 -0800
commite6a9918c9617ed21f71f2f20b45efe06822c8f00 (patch)
tree1518725e6db9a84667cc0d713a5e5c6c156a979d /arch/i386/kernel/head.S
parent5fe9fe3c6f9a1ae7aa224bb7a66eb9aad9e4abef (diff)
[PATCH] x86: Fixed pnp bios limits
PnP BIOS data, code, and 32-bit entry segments all have fixed limits as well; set them in the GDT rather than adding more code. It would be nice to add these fixups to the boot GDT rather than setting the GDT for each CPU; perhaps I can wiggle this in later, but getting it in before the subsys init looks tricky. Also, make some progress on deprecating the ugly Q_SET_SEL macros. Signed-off-by: Zachary Amsden <zach@vmware.com> Cc: "Seth, Rohit" <rohit.seth@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/head.S')
-rw-r--r--arch/i386/kernel/head.S12
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index 58d2746670b..5884469f6bf 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -504,10 +504,14 @@ ENTRY(cpu_gdt_table)
.quad 0x0000000000000000 /* 0x80 TSS descriptor */
.quad 0x0000000000000000 /* 0x88 LDT descriptor */
- /* Segments used for calling PnP BIOS have byte granularity */
- .quad 0x00409a0000000000 /* 0x90 32-bit code */
- .quad 0x00009a0000000000 /* 0x98 16-bit code */
- .quad 0x0000920000000000 /* 0xa0 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 */