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 "../system.h"
  17
  18 #if SPROFILE
  19
  20 /*===========================================================================*
  21  *                              do_sprofile                                  *
  22  *===========================================================================*/
  23 PUBLIC int do_sprofile(m_ptr)
  24 register message *m_ptr;    /* pointer to request message */
  25 {
  26   int proc_nr, i;
  27   vir_bytes vir_dst;
  28   phys_bytes length;
  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                 kprintf("SYSTEM: start s-profiling: already started\n");
  41                 return EBUSY;
  42         }
  43
  44         isokendpt(m_ptr->PROF_ENDPT, &proc_nr);
  45
  46         vir_dst = (vir_bytes) m_ptr->PROF_CTL_PTR;
  47         length = (phys_bytes) sizeof (int *);
  48         sprof_info_addr = numap_local(proc_nr, vir_dst, length);
  49
  50         vir_dst = (vir_bytes) m_ptr->PROF_MEM_PTR;
  51         length = (phys_bytes) sizeof (char *);
  52         sprof_data_addr = numap_local(proc_nr, vir_dst, length);
  53
  54         sprof_info.mem_used = 0;
  55         sprof_info.total_samples = 0;
  56         sprof_info.idle_samples = 0;
  57         sprof_info.system_samples = 0;
  58         sprof_info.user_samples = 0;
  59
  60         sprof_mem_size = m_ptr->PROF_MEM_SIZE;
  61
  62         init_profile_clock(m_ptr->PROF_FREQ);
  63
  64         sprofiling = 1;
  65
  66         return OK;
  67
  68   case PROF_STOP:
  69         /* Stopping profiling.
  70          *
  71          * Check if profiling is indeed running.  Turn off profiling.
  72          * Stop CMOS timer.  Copy info struct to user process.
  73          */
  74         if (!sprofiling) {
  75                 kprintf("SYSTEM: stop s-profiling: not started\n");
  76                 return EBUSY;
  77         }
  78
  79         sprofiling = 0;
  80
  81         stop_profile_clock();
  82
  83         phys_copy(vir2phys((vir_bytes) &sprof_info),
  84                 sprof_info_addr, (phys_bytes) sizeof(sprof_info));
  85
  86         return OK;
  87
  88   default:
  89         return EINVAL;
  90   }
  91 }
  92
  93 #endif /* SPROFILE */
  94