diff options
| author | Marcelo Tosatti <marcelo@kvack.org> | 2007-02-16 01:27:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:13:58 -0800 |
| commit | 07190a08eef3666a8687070226c8d403c1d548b7 (patch) | |
| tree | 20a9f7e9b6bf925a6721f88e438ec551fa8ce992 /include/asm-i386 | |
| parent | 5d8b34fdcb384161552d01ee8f34af5ff11f9684 (diff) | |
[PATCH] Mark TSC on GeodeLX reliable
The Geode can safely use the TSC for highres, since:
1) Does not support frequency scaling,
2) The TSC _does_ count when the CPU is halted. Furthermore, the Geode
supports a mode called "suspension on halt", where Suspend mode (which
interacts with the power management states) is entered. TSC counting
during suspend mode is controlled by bit 8 of the Bus Controller
Configuration Register #0 (thanks Tom!).
3) no SMP :)
Check if "RTSC counts during suspension" and remove the requirement for
verification, so the clocksource code can safely select it as an timesource
for the highres timers subsystem.
Signed-off-by: Marcelo Tosatti <marcelo@kvack.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386')
| -rw-r--r-- | include/asm-i386/msr.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h index 609a3899475..6db40d0583f 100644 --- a/include/asm-i386/msr.h +++ b/include/asm-i386/msr.h @@ -307,4 +307,7 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val) #define MSR_CORE_PERF_GLOBAL_CTRL 0x38f #define MSR_CORE_PERF_GLOBAL_OVF_CTRL 0x390 +/* Geode defined MSRs */ +#define MSR_GEODE_BUSCONT_CONF0 0x1900 + #endif /* __ASM_MSR_H */ |