minix/kernel/system/do_sprofile.c
2010-04-01 22:22:33 +00:00

93 lines
2.3 KiB
C

/* The kernel call that is implemented in this file:
* m_type: SYS_SPROFILE
*
* The parameters for this kernel call are:
* m7_i1: PROF_ACTION (start/stop profiling)
* m7_i2: PROF_MEM_SIZE (available memory for data)
* m7_i3: PROF_FREQ (requested sample frequency)
* m7_i4: PROF_ENDPT (endpoint of caller)
* m7_p1: PROF_CTL_PTR (location of info struct)
* m7_p2: PROF_MEM_PTR (location of memory for data)
*
* Changes:
* 14 Aug, 2006 Created (Rogier Meurs)
*/
#include "kernel/system.h"
#if SPROFILE
/* user address to write info struct */
PRIVATE vir_bytes sprof_info_addr_vir;
/*===========================================================================*
* do_sprofile *
*===========================================================================*/
PUBLIC int do_sprofile(struct proc * caller, message * m_ptr)
{
int proc_nr;
switch(m_ptr->PROF_ACTION) {
case PROF_START:
/* Starting profiling.
*
* Check if profiling is not already running. Calculate physical
* addresses of user pointers. Reset counters. Start CMOS timer.
* Turn on profiling.
*/
if (sprofiling) {
printf("SYSTEM: start s-profiling: already started\n");
return EBUSY;
}
/* Test endpoint number. */
if(!isokendpt(m_ptr->PROF_ENDPT, &proc_nr))
return EINVAL;
/* Set parameters for statistical profiler. */
sprof_ep = m_ptr->PROF_ENDPT;
sprof_info_addr_vir = (vir_bytes) m_ptr->PROF_CTL_PTR;
sprof_data_addr_vir = (vir_bytes) m_ptr->PROF_MEM_PTR;
sprof_info.mem_used = 0;
sprof_info.total_samples = 0;
sprof_info.idle_samples = 0;
sprof_info.system_samples = 0;
sprof_info.user_samples = 0;
sprof_mem_size = m_ptr->PROF_MEM_SIZE;
init_profile_clock(m_ptr->PROF_FREQ);
sprofiling = 1;
return OK;
case PROF_STOP:
/* Stopping profiling.
*
* Check if profiling is indeed running. Turn off profiling.
* Stop CMOS timer. Copy info struct to user process.
*/
if (!sprofiling) {
printf("SYSTEM: stop s-profiling: not started\n");
return EBUSY;
}
sprofiling = 0;
stop_profile_clock();
data_copy(KERNEL, (vir_bytes) &sprof_info,
sprof_ep, sprof_info_addr_vir, sizeof(sprof_info));
return OK;
default:
return EINVAL;
}
}
#endif /* SPROFILE */