Module: xenomai-head
Branch: master
Commit: 6c8f7c5b79b633bc1f50bbaa1d50ea3c309b3dcd
URL:
http://git.xenomai.org/?p=xenomai-head.git;a=commit;h=6c8f7c5b79b633bc1f50bbaa1d50ea3c309b3dcd
Author: Philippe Gerum <r...@xenomai.org>
Date: Tue Jun 2 18:24:24 2009 +0200
Introduce xnarch_divrem_billion
We need an efficient helper to divide a long long value by 10e9 and
collect the remainder.
---
include/asm-generic/arith.h | 1 +
include/asm-generic/bits/timeconv.h | 16 ++++++++++++++++
include/asm-generic/system.h | 3 +++
include/asm-sim/system.h | 9 +++++++++
4 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/include/asm-generic/arith.h b/include/asm-generic/arith.h
index 70a134e..dac9ccb 100644
--- a/include/asm-generic/arith.h
+++ b/include/asm-generic/arith.h
@@ -382,6 +382,7 @@ static inline void xnarch_init_llmulshft(const unsigned
m_in,
#define xnarch_imuldiv rthal_imuldiv
#define xnarch_imuldiv_ceil rthal_imuldiv_ceil
#define xnarch_llimd rthal_llimd
+#define xnarch_nodiv_ullimd rthal_nodiv_ullimd
#define xnarch_nodiv_llimd rthal_nodiv_llimd
#define xnarch_llmulshft rthal_llmulshft
#define xnarch_get_cpu_tsc rthal_rdtsc
diff --git a/include/asm-generic/bits/timeconv.h
b/include/asm-generic/bits/timeconv.h
index e6f4d11..c2635fc 100644
--- a/include/asm-generic/bits/timeconv.h
+++ b/include/asm-generic/bits/timeconv.h
@@ -27,6 +27,7 @@ static unsigned long long cpufreq;
static unsigned int tsc_scale, tsc_shift;
#ifdef XNARCH_HAVE_NODIV_LLIMD
static rthal_u32frac_t tsc_frac;
+static rthal_u32frac_t bln_frac;
#endif
#endif
@@ -56,11 +57,25 @@ long long xnarch_ns_to_tsc(long long ns)
{
return xnarch_nodiv_llimd(ns, tsc_frac.frac, tsc_frac.integ);
}
+unsigned long long xnarch_divrem_billion(unsigned long long value,
+ unsigned long *rem)
+{
+ unsigned long long r;
+ r = xnarch_nodiv_ullimd(value, bln_frac.frac, bln_frac.integ);
+ *rem = value - xnarch_ullmul(r, 1000000000);
+ return r;
+}
#else /* !XNARCH_HAVE_NODIV_LLIMD */
long long xnarch_ns_to_tsc(long long ns)
{
return xnarch_llimd(ns, cpufreq, 1000000000);
}
+unsigned long long xnarch_divrem_billion(unsigned long long value,
+ unsigned long *rem)
+{
+ return xnarch_ulldiv(value, 1000000000, rem);
+
+}
#endif /* !XNARCH_HAVE_NODIV_LLIMD */
static inline void xnarch_init_timeconv(unsigned long long freq)
@@ -70,6 +85,7 @@ static inline void xnarch_init_timeconv(unsigned long long
freq)
xnarch_init_llmulshft(1000000000, freq, &tsc_scale, &tsc_shift);
#ifdef XNARCH_HAVE_NODIV_LLIMD
xnarch_init_u32frac(&tsc_frac, 1 << tsc_shift, tsc_scale);
+ xnarch_init_u32frac(&bln_frac, 1, 1000000000);
#endif
#endif
}
diff --git a/include/asm-generic/system.h b/include/asm-generic/system.h
index 7d68a9d..fcec613 100644
--- a/include/asm-generic/system.h
+++ b/include/asm-generic/system.h
@@ -287,6 +287,9 @@ long long xnarch_ns_to_tsc(long long ns);
unsigned long long xnarch_get_cpu_time(void);
+unsigned long long xnarch_divrem_billion(unsigned long long value,
+ unsigned long *rem);
+
static inline unsigned long long xnarch_get_cpu_freq(void)
{
return RTHAL_CPU_FREQ;
diff --git a/include/asm-sim/system.h b/include/asm-sim/system.h
index 5162bef..1df58c6 100644
--- a/include/asm-sim/system.h
+++ b/include/asm-sim/system.h
@@ -418,6 +418,15 @@ static inline unsigned long long xnarch_ns_to_tsc
(unsigned long long ns)
return ns;
}
+unsigned long long xnarch_divrem_billion(unsigned long long value,
+ unsigned long *rem)
+{
+ unsigned long long r;
+ r = value / 1000000000ULL;
+ *rem = value - (r * 1000000000ULL);
+ return r;
+}
+
static inline unsigned long long xnarch_get_cpu_time (void)
{
return mvm_get_cpu_time();
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