@@ -12,6 +12,8 @@
#include <zlib.h> /* For crc32 */
#include "exec/semihost.h"
+#define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
+
#ifndef CONFIG_USER_ONLY
static inline bool get_phys_addr(CPUARMState *env, target_ulong address,
int access_type, ARMMMUIdx mmu_idx,
@@ -678,8 +680,8 @@ void pmccntr_sync(CPUARMState *env)
{
uint64_t temp_ticks;
- temp_ticks = muldiv64(qemu_clock_get_us(QEMU_CLOCK_VIRTUAL),
- get_ticks_per_sec(), 1000000);
+ temp_ticks = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+ ARM_CPU_FREQ, NANOSECONDS_PER_SECOND);
if (env->cp15.c9_pmcr & PMCRD) {
/* Increment once every 64 processor clock cycles */
@@ -717,8 +719,8 @@ static uint64_t pmccntr_read(CPUARMState *env, const ARMCPRegInfo *ri)
return env->cp15.c15_ccnt;
}
- total_ticks = muldiv64(qemu_clock_get_us(QEMU_CLOCK_VIRTUAL),
- get_ticks_per_sec(), 1000000);
+ total_ticks = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+ ARM_CPU_FREQ, NANOSECONDS_PER_SECOND);
if (env->cp15.c9_pmcr & PMCRD) {
/* Increment once every 64 processor clock cycles */
@@ -738,8 +740,8 @@ static void pmccntr_write(CPUARMState *env, const ARMCPRegInfo *ri,
return;
}
- total_ticks = muldiv64(qemu_clock_get_us(QEMU_CLOCK_VIRTUAL),
- get_ticks_per_sec(), 1000000);
+ total_ticks = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+ ARM_CPU_FREQ, NANOSECONDS_PER_SECOND);
if (env->cp15.c9_pmcr & PMCRD) {
/* Increment once every 64 processor clock cycles */
muldiv64() is used to convert microseconds into CPU ticks. But it is not clear and not commented. This patch uses macro to clearly identify what is used: time, CPU frequency and ticks. For an elapsed time and a given frequency, we compute how many ticks we have. Signed-off-by: Laurent Vivier <lvivier@redhat.com> --- v2: replace "arm: remove muldiv64()" target-arm/helper.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)