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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-29 17:11:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-29 17:11:29 -0700 |
| commit | 40193713df2cdb9c233b3fc2029ecdccb40cb1e4 (patch) | |
| tree | db2ce73665b250672f5f5c0cf7544ec370c122f9 /arch/ppc64/kernel/pmc.c | |
| parent | 8f3d17fb7bcb7c255197d11469fb5e9695c9d2f4 (diff) | |
| parent | c594adad5653491813959277fb87a2fef54c4e05 (diff) | |
Merge HEAD from master.kernel.org:/pub/scm/linux/kernel/git/paulus/ppc64-2.6
Diffstat (limited to 'arch/ppc64/kernel/pmc.c')
| -rw-r--r-- | arch/ppc64/kernel/pmc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/pmc.c b/arch/ppc64/kernel/pmc.c index 67be773f9c00..cdfec7438d01 100644 --- a/arch/ppc64/kernel/pmc.c +++ b/arch/ppc64/kernel/pmc.c @@ -65,3 +65,24 @@ void release_pmc_hardware(void) spin_unlock(&pmc_owner_lock); } EXPORT_SYMBOL_GPL(release_pmc_hardware); + +void power4_enable_pmcs(void) +{ + unsigned long hid0; + + hid0 = mfspr(HID0); + hid0 |= 1UL << (63 - 20); + + /* POWER4 requires the following sequence */ + asm volatile( + "sync\n" + "mtspr %1, %0\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "mfspr %0, %1\n" + "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0): + "memory"); +} |