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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-12-16 10:39:02 -0700 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-12-17 10:01:30 -0800 |
| commit | a2c606d53ab71dee6410f10ef0adf67321d60e06 (patch) | |
| tree | 7a4cf519cbfc01fd1c4273c1481f40f4cd7d00bc /include | |
| parent | 4dc2287c1805e7fe8a7cb90bbcd44abee8cdb914 (diff) | |
| download | op-kernel-dev-a2c606d53ab71dee6410f10ef0adf67321d60e06.zip op-kernel-dev-a2c606d53ab71dee6410f10ef0adf67321d60e06.tar.gz | |
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 'include')
0 files changed, 0 insertions, 0 deletions
