diff options
| author | Zachary Amsden <zach@vmware.com> | 2006-01-06 00:11:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:35 -0800 |
| commit | e6a9918c9617ed21f71f2f20b45efe06822c8f00 (patch) | |
| tree | 1518725e6db9a84667cc0d713a5e5c6c156a979d /arch/i386/kernel/head.S | |
| parent | 5fe9fe3c6f9a1ae7aa224bb7a66eb9aad9e4abef (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.S | 12 |
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 */ |