kernel/system/do_sprofile.c

   1 /* The kernel call that is implemented in this file:
   2  *   m_type:    SYS_SPROFILE
   3  *
   4  * The parameters for this kernel call are:
   5  *    m7_i1:    PROF_ACTION       (start/stop profiling)
   6  *    m7_i2:    PROF_MEM_SIZE     (available memory for data)
   7  *    m7_i3:    PROF_FREQ         (requested sample frequency)
   8  *    m7_i4:    PROF_ENDPT        (endpoint of caller)
   9  *    m7_p1:    PROF_CTL_PTR      (location of info struct)
  10  *    m7_p2:    PROF_MEM_PTR      (location of memory for data)
  11  *
  12  * Changes:
  13  *   14 Aug, 2006   Created (Rogier Meurs)
  14  */
  15
  16 #include "kernel/system.h"
  17
  18 #if SPROFILE
  19
  20 /* user address to write info struct */
  21 PRIVATE vir_bytes sprof_info_addr_vir;
  22
  23 /*===========================================================================*
  24  *                              do_sprofile                                  *
  25  *===========================================================================*/
  26 PUBLIC int do_sprofile(struct proc * caller, message * m_ptr)
  27 {
  28   int proc_nr;
  29
  30   switch(m_ptr->PROF_ACTION) {
  31
  32   case PROF_START:
  33         /* Starting profiling.
  34          *
  35          * Check if profiling is not already running.  Calculate physical
  36          * addresses of user pointers.  Reset counters.  Start CMOS timer.
  37          * Turn on profiling.
  38          */
  39         if (sprofiling) {
  40                 printf("SYSTEM: start s-profiling: already started\n");
  41                 return EBUSY;
  42         }
  43
  44         /* Test endpoint number. */
  45         if(!isokendpt(m_ptr->PROF_ENDPT, &proc_nr))
  46                 return EINVAL;
  47
  48         /* Set parameters for statistical profiler. */
  49         sprof_ep = m_ptr->PROF_ENDPT;
  50         sprof_info_addr_vir = (vir_bytes) m_ptr->PROF_CTL_PTR;
  51         sprof_data_addr_vir = (vir_bytes) m_ptr->PROF_MEM_PTR;
  52
  53         sprof_info.mem_used = 0;
  54         sprof_info.total_samples = 0;
  55         sprof_info.idle_samples = 0;
  56         sprof_info.system_samples = 0;
  57         sprof_info.user_samples = 0;
  58
  59         sprof_mem_size = m_ptr->PROF_MEM_SIZE;
  60
  61         init_profile_clock(m_ptr->PROF_FREQ);
  62
  63         sprofiling = 1;
  64
  65         return OK;
  66
  67   case PROF_STOP:
  68         /* Stopping profiling.
  69          *
  70          * Check if profiling is indeed running.  Turn off profiling.
  71          * Stop CMOS timer.  Copy info struct to user process.
  72          */
  73         if (!sprofiling) {
  74                 printf("SYSTEM: stop s-profiling: not started\n");
  75                 return EBUSY;
  76         }
  77
  78         sprofiling = 0;
  79
  80         stop_profile_clock();
  81
  82         data_copy(KERNEL, (vir_bytes) &sprof_info,
  83                 sprof_ep, sprof_info_addr_vir, sizeof(sprof_info));
  84
  85         return OK;
  86
  87   default:
  88         return EINVAL;
  89   }
  90 }
  91
  92 #endif /* SPROFILE */
  93