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2008-12-03 Joel Sherrill <joel.sherrill@OARcorp.com>

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Michael South <msouth@msouth.org>

	PR 1344/bsps
	* cpuModel.h: Add use of TSC for nanoseconds granularity. i8254 is very
	slow on some systems. TSC use is auto-detected by default.
This commit is contained in:
Joel Sherrill
2008-12-03 17:29:13 +00:00
parent dcbc0a89c2
commit c6016f15d6
2 changed files with 21 additions and 0 deletions
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7
c/src/lib/libcpu/i386/ChangeLog
View File

@@ -1,3 +1,10 @@
2008-12-03 Joel Sherrill <joel.sherrill@OARcorp.com>
Michael South <msouth@msouth.org>
PR 1344/bsps
* cpuModel.h: Add use of TSC for nanoseconds granularity. i8254 is very
slow on some systems. TSC use is auto-detected by default.
2008-08-16 Ralf Corsépius <ralf.corsepius@rtems.org>
* cache.c, displayCpu.c, page.c: Add missing prototypes.

14
c/src/lib/libcpu/i386/cpuModel.h
View File

@@ -31,4 +31,18 @@ extern unsigned char Cx86_step; /* cyrix processor identification */
extern void printCpuInfo(); /* Display this information on console in ascii form */
/* determine if the CPU has a TSC */
#define x86_has_tsc() \
(x86_capability & (1 << 4))
static inline unsigned long long
rdtsc(void)
{
/* Return the value of the on-chip cycle counter. */
unsigned long long result;
asm volatile(".byte 0x0F, 0x31" : "=A" (result));
return result;
} /* rdtsc */
#endif