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qemu-timer: move commonly used timer code to qemu-timer-common

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Move timer init functions to a new file, qemu-timer-common.c. Make other
critical timer functions inlined to preserve performance in
qemu-timer.c, also move muldiv64() (used by the inline functions)
to qemu-timer.h.

Adjust block/raw-posix.c and simpletrace.c to use get_clock() directly.
Remove a similar/duplicate definition in qemu-tool.c.

Adjust hw/omap_clk.c to include qemu-timer.h because muldiv64() is used
there.

After this change, tracing can be used also for user code and
simpletrace on Win32.

Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2010-10-23 15:24:07 +00:00
parent 2b2e59e6c9
commit c57c846a80
11 changed files with 150 additions and 124 deletions
Download patch file Download diff file Expand all files Collapse all files

74
qemu-timer.h
View file

@ -2,6 +2,13 @@
#define QEMU_TIMER_H
#include "qemu-common.h"
#include <time.h>
#include <sys/time.h>
#ifdef _WIN32
#include <windows.h>
#include <mmsystem.h>
#endif
/* timers */
@ -52,6 +59,73 @@ static inline int64_t get_ticks_per_sec(void)
return 1000000000LL;
}
/* compute with 96 bit intermediate result: (a*b)/c */
static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
{
union {
uint64_t ll;
struct {
#ifdef HOST_WORDS_BIGENDIAN
uint32_t high, low;
#else
uint32_t low, high;
#endif
} l;
} u, res;
uint64_t rl, rh;
u.ll = a;
rl = (uint64_t)u.l.low * (uint64_t)b;
rh = (uint64_t)u.l.high * (uint64_t)b;
rh += (rl >> 32);
res.l.high = rh / c;
res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
return res.ll;
}
/* real time host monotonic timer */
static inline int64_t get_clock_realtime(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
#ifdef _WIN32
extern int64_t clock_freq;
static inline int64_t get_clock(void)
{
LARGE_INTEGER ti;
QueryPerformanceCounter(&ti);
return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);
}
#else
extern int use_rt_clock;
static inline int64_t get_clock(void)
{
#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
|| defined(__DragonFly__) || defined(__FreeBSD_kernel__)
if (use_rt_clock) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000000000LL + ts.tv_nsec;
} else
#endif
{
/* XXX: using gettimeofday leads to problems if the date
changes, so it should be avoided. */
return get_clock_realtime();
}
}
#endif
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts);
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts);