diff options
| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-12-16 20:39:02 +0300 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-12-17 21:01:30 +0300 |
| commit | a2c606d53ab71dee6410f10ef0adf67321d60e06 (patch) | |
| tree | 7a4cf519cbfc01fd1c4273c1481f40f4cd7d00bc /arch/x86/include/asm/e820.h | |
| parent | 4dc2287c1805e7fe8a7cb90bbcd44abee8cdb914 (diff) | |
| download | linux-a2c606d53ab71dee6410f10ef0adf67321d60e06.tar.xz | |
x86: avoid high BIOS area when allocating address space
This prevents allocation of the last 2MB before 4GB.
The experiment described here shows Windows 7 ignoring the last 1MB:
https://bugzilla.kernel.org/show_bug.cgi?id=23542#c27
This patch ignores the top 2MB instead of just 1MB because H. Peter Anvin
says "There will be ROM at the top of the 32-bit address space; it's a fact
of the architecture, and on at least older systems it was common to have a
shadow 1 MiB below."
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86/include/asm/e820.h')
| -rw-r--r-- | arch/x86/include/asm/e820.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index 5be1542fbfaf..e99d55d74df5 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -72,6 +72,9 @@ struct e820map { #define BIOS_BEGIN 0x000a0000 #define BIOS_END 0x00100000 +#define BIOS_ROM_BASE 0xffe00000 +#define BIOS_ROM_END 0xffffffff + #ifdef __KERNEL__ /* see comment in arch/x86/kernel/e820.c */ extern struct e820map e820; |