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| author | H. Peter Anvin <hpa@zytor.com> | 2009-04-21 19:15:55 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-04-21 19:15:55 -0700 |
| commit | 6af3d0ea72a6f6852bda7519278a0c6fdd16d2b5 (patch) | |
| tree | acbb1afd35c0cae0dd13642e6485b3516a063e40 | |
| parent | b558a3e68fe65960f83b8372b2795b3ba58fa0d2 (diff) | |
| download | syslinux.git-6af3d0ea72a6f6852bda7519278a0c6fdd16d2b5.tar.gz syslinux.git-6af3d0ea72a6f6852bda7519278a0c6fdd16d2b5.tar.xz syslinux.git-6af3d0ea72a6f6852bda7519278a0c6fdd16d2b5.zip | |
a20: advance A20Test by a large, prime number
Rather than simply incrementing A20Test, advance it by a large prime
number every time. The reason is to minimize false aliasing as
quickly as possible.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | core/bcopy32.inc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/core/bcopy32.inc b/core/bcopy32.inc index 97b92638..c7155574 100644 --- a/core/bcopy32.inc +++ b/core/bcopy32.inc @@ -333,7 +333,7 @@ a20_test: mov eax,[cs:A20Test] mov cx,32 ; Loop count jmp .test ; First iteration = early out -.wait: inc eax +.wait: add eax,0x430aea41 ; A large prime number mov [cs:A20Test],eax io_delay ; Serialize, and fix delay .test: cmp eax,[es:A20Test+10h] |