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| author | H. Peter Anvin <hpa@zytor.com> | 2009-04-13 19:43:35 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-04-13 19:43:35 -0700 |
| commit | dae8d6496ecd8afefc5e0bd6543c97f24282804f (patch) | |
| tree | 90405386413aa83e690b608aba815082a09df5fc /doc | |
| parent | 4c02b034c291c2a7dd5975f9140513e9b54c1be5 (diff) | |
| download | syslinux.git-dae8d6496ecd8afefc5e0bd6543c97f24282804f.tar.gz syslinux.git-dae8d6496ecd8afefc5e0bd6543c97f24282804f.tar.xz syslinux.git-dae8d6496ecd8afefc5e0bd6543c97f24282804f.zip | |
doc: add note about KVM restriction on CS.base
Add note about KVM restrictions on CS.base before entering real mode.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/comboot.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/comboot.txt b/doc/comboot.txt index 9c81c489..68f1e7e7 100644 --- a/doc/comboot.txt +++ b/doc/comboot.txt @@ -947,7 +947,9 @@ AX=0024h [3.80] Cleanup, shuffle and boot, raw version For mode 0 (16-bit real mode), EAX will contain CR0 with bit 0 masked out, suitable for loading into CR0 to immediately enter - real mode. + real mode. Note: if real-mode entry is planned, + (CS.base & 0xfff0000f) == 0 for compatibility with KVM, and + possibly other virtualization solutions. In both mode 0 and mode 1, the data segments will be loaded with base-zero read/write segments. For mode 0, B=0 and the |