From: H. Peter Anvin Date: Tue, 14 Apr 2009 02:43:35 +0000 (-0700) Subject: doc: add note about KVM restriction on CS.base X-Git-Tag: syslinux-3.80-pre1~15^2~20 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dae8d6496ecd8afefc5e0bd6543c97f24282804f;p=platform%2Fupstream%2Fsyslinux.git 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 --- diff --git a/doc/comboot.txt b/doc/comboot.txt index 9c81c48..68f1e7e 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