pmla.h

AT91RM9200的定时器驱动(linux2.4内核）

/* poor mans logic analyzer header file */
/* poor mans logic analyzer uses a fast counter (mftb instruction [via get_tbl] in ppc)
 (OSCR in arm) (rdtscl in i386) that gets saved into a circular buffer for later analysis 
 by a perl script (~/scripts/gdb.pmla.pl) from gdb output from a macro in ~/.gdbinit (dmp)
NOTE: this is self initializing AS LONG as the PMLA struct is cleared upon first
 use */

/* #define pmla_cntr() get_tbl() */  /* for __ppc__ */
#define pmla_cntr() \
({ \
  unsigned long temp; \
  do { \
    temp = *AT91C_TC0_CV | (*AT91C_TC1_CV << 16); \
     } while ((temp ^ (*AT91C_TC1_CV << 16)) & 0xffff0000); \
  temp; \
})
/* #define pmla_cntr() rdtscl() */  /* for __i386__ */

#define pmla_save(ptr, pmlaid, pmlaparam1, pmlaparam2) \
do { \
   PMLA_TRACE *pmla_trace; \
   if (!ptr->pmla.pmla_stop || (ptr->pmla.pmla_hd != ptr->pmla.pmla_stop)) \
    { \
    if (ptr->pmla.pmla_hd <= &ptr->pmla.pmla_buf[0]) \
      ptr->pmla.pmla_hd = &ptr->pmla.pmla_buf[PMLA_TRACE_SZ]; \
    pmla_trace = --ptr->pmla.pmla_hd; \
    pmla_trace->id = pmlaid; \
    pmla_trace->param1 = pmlaparam1; \
    pmla_trace->param2 = pmlaparam2; \
    pmla_trace->time = pmla_cntr(); \
    } \
  } while (0)

/* using this one first requires initialization of pmla_hd */
#define pmla_mult(ptr, pmlaid, pmlaparam1, pmlaparam2) \
do { \
   PMLA_TRACE *pmla_trace; \
   if (!ptr->pmla.pmla_stop || (ptr->pmla.pmla_hd != ptr->pmla.pmla_stop)) \
    { \
    if (ptr->pmla.pmla_hd->id != pmlaid) \
      { \
      if (ptr->pmla.pmla_hd <= &ptr->pmla.pmla_buf[0]) \
        ptr->pmla.pmla_hd = &ptr->pmla.pmla_buf[PMLA_TRACE_SZ]; \
      ptr->pmla.pmla_hd--; \
      } \
    pmla_trace = ptr->pmla.pmla_hd; \
    pmla_trace->id = pmlaid; \
    pmla_trace->param1 = pmlaparam1; \
    pmla_trace->param2 = pmlaparam2; \
    pmla_trace->time = pmla_cntr(); \
    } \
  } while (0)

#define pmla_trig_center(ptr, pmlaid, pmlaparam1, pmlaparam2) \
do { \
   PMLA_TRACE *pmla_trace; \
   if (ptr->pmla.pmla_hd != ptr->pmla.pmla_stop) \
    { \
    if (!ptr->pmla.pmla_stop) \
      { \
      ptr->pmla.pmla_stop = ptr->pmla.pmla_hd - (PMLA_TRACE_SZ / 2); \
      if (ptr->pmla.pmla_stop < &ptr->pmla.pmla_buf[0]) \
        ptr->pmla.pmla_stop += PMLA_TRACE_SZ; \
      } \
    if (ptr->pmla.pmla_hd <= &ptr->pmla.pmla_buf[0]) \
      ptr->pmla.pmla_hd = &ptr->pmla.pmla_buf[PMLA_TRACE_SZ]; \
    pmla_trace = --ptr->pmla.pmla_hd; \
    pmla_trace->id = pmlaid; \
    pmla_trace->param1 = pmlaparam1; \
    pmla_trace->param2 = pmlaparam2; \
    pmla_trace->time = pmla_cntr(); \
    } \
  } while (0)

typedef struct pmla_trace
  {
    ulong id;  /* id number of this timing save */
    ulong param1;  /* 1st parameter */
    ulong param2;  /* 2nd parameter */
    ulong time;  /* where the time get's saved */
  }PMLA_TRACE;
typedef struct pmla
  {
    PMLA_TRACE *pmla_hd;
    PMLA_TRACE *pmla_stop;
#define PMLA_TRACE_SZ 200
    PMLA_TRACE pmla_buf[PMLA_TRACE_SZ];
  }PMLA;