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[PATCH] ppc64: cleanup iseries runlight support

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The iseries has a bar graph on the front panel that shows how busy it is.
The operating system sets and clears a bit in the CTRL register to control
it.

Instead of going to the complexity of using a thread info bit, just set and
clear it in the idle loop.

Also create two helper functions, ppc64_runlatch_on and ppc64_runlatch_off.

Finally don't use the short form of the SPR defines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Anton Blanchard
2005-06-02 14:02:02 -07:00
committed by Linus Torvalds
parent 79f1248962
commit 6dc2f0c7df
7 changed files with 33 additions and 36 deletions
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27
include/asm-ppc64/processor.h
View File

@@ -164,6 +164,9 @@
#define SPRN_USIA 0x3AB /* User Sampled Instruction Address Register */
#define SPRN_XER 0x001 /* Fixed Point Exception Register */
#define SPRN_VRSAVE 0x100 /* Vector save */
#define SPRN_CTRLF 0x088
#define SPRN_CTRLT 0x098
#define CTRL_RUNLATCH 0x1
/* Performance monitor SPRs */
#define SPRN_SIAR 780
@@ -279,12 +282,6 @@
#define XGLUE(a,b) a##b
#define GLUE(a,b) XGLUE(a,b)
/* iSeries CTRL register (for runlatch) */
#define CTRLT 0x098
#define CTRLF 0x088
#define RUNLATCH 0x0001
#ifdef __ASSEMBLY__
#define _GLOBAL(name) \
@@ -499,6 +496,24 @@ static inline void prefetchw(const void *x)
#define HAVE_ARCH_PICK_MMAP_LAYOUT
static inline void ppc64_runlatch_on(void)
{
unsigned long ctrl;
ctrl = mfspr(SPRN_CTRLF);
ctrl |= CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
}
static inline void ppc64_runlatch_off(void)
{
unsigned long ctrl;
ctrl = mfspr(SPRN_CTRLF);
ctrl &= ~CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
}
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

4
include/asm-ppc64/thread_info.h
View File

@@ -96,7 +96,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_32BIT 5 /* 32 bit binary */
#define TIF_RUN_LIGHT 6 /* iSeries run light */
/* #define SPARE 6 */
#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
#define TIF_SINGLESTEP 9 /* singlestepping active */
@@ -110,7 +110,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_32BIT (1<<TIF_32BIT)
#define _TIF_RUN_LIGHT (1<<TIF_RUN_LIGHT)
/* #define _SPARE (1<<SPARE) */
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)