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| author |   Sam Ravnborg <sam@ravnborg.org> | 2008-06-19 20:26:19 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2008-07-17 21:44:53 -0700 |
| commit | a00736e936c2a1e9c36f22f6f3a69392eaab51f4 (patch) | |
| tree | 4fd3d203dbc30d50a1b0c1acce2957e082a75173 /include/asm-sparc/backoff.h | |
| parent | sparc: Merge asm-sparc{,64}/asi.h (diff) | |
| download | linux-dev-a00736e936c2a1e9c36f22f6f3a69392eaab51f4.tar.xz linux-dev-a00736e936c2a1e9c36f22f6f3a69392eaab51f4.zip | |
sparc: copy sparc64 specific files to asm-sparc
Used the following script to copy the files:
cd include
set -e
SPARC64=`ls asm-sparc64`
for FILE in ${SPARC64}; do
if [ -f asm-sparc/$FILE ]; then
echo $FILE exist in asm-sparc
else
git mv asm-sparc64/$FILE asm-sparc/$FILE
printf "#include <asm-sparc/$FILE>\n" > asm-sparc64/$FILE
git add asm-sparc64/$FILE
fi
done
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'include/asm-sparc/backoff.h')
| -rw-r--r-- | include/asm-sparc/backoff.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/asm-sparc/backoff.h b/include/asm-sparc/backoff.h new file mode 100644 index 000000000000..fa1fdf67e350 --- /dev/null +++ b/include/asm-sparc/backoff.h @@ -0,0 +1,31 @@ +#ifndef _SPARC64_BACKOFF_H +#define _SPARC64_BACKOFF_H + +#define BACKOFF_LIMIT (4 * 1024) + +#ifdef CONFIG_SMP + +#define BACKOFF_SETUP(reg) \ + mov 1, reg + +#define BACKOFF_SPIN(reg, tmp, label) \ + mov reg, tmp; \ +88: brnz,pt tmp, 88b; \ + sub tmp, 1, tmp; \ + set BACKOFF_LIMIT, tmp; \ + cmp reg, tmp; \ + bg,pn %xcc, label; \ + nop; \ + ba,pt %xcc, label; \ + sllx reg, 1, reg; + +#else + +#define BACKOFF_SETUP(reg) +#define BACKOFF_SPIN(reg, tmp, label) \ + ba,pt %xcc, label; \ + nop; + +#endif + +#endif /* _SPARC64_BACKOFF_H */ |