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authorH. Peter Anvin <hpa@linux.intel.com>2009-04-14 12:37:42 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2009-04-14 12:37:42 -0700
commit77db7ac9110b5e14ea55497f7e47c1dd37600b2f (patch)
tree6d834b0be8307ee4fda9df8fc943a8a729898459 /doc
parenteb22c1f10a7f1946b9301cebf3b0c2c3bd2b11bb (diff)
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doc: clarify CS.base restriction for KVM
Clarify that the CS.base restriction is a prescription of compatibility, and not something that the ABI handles transparently. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'doc')
-rw-r--r--doc/comboot.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/comboot.txt b/doc/comboot.txt
index 68f1e7e7..cf18b2b6 100644
--- a/doc/comboot.txt
+++ b/doc/comboot.txt
@@ -948,8 +948,8 @@ 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. Note: if real-mode entry is planned,
- (CS.base & 0xfff0000f) == 0 for compatibility with KVM, and
- possibly other virtualization solutions.
+ (CS.base & 0xfff0000f) should == 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