minix/drivers/net/rtl8139/liveupdate.c

   1 /* Code left here for historical purposes only. TODO: move into libnetdriver */
   2
   3 #include "rtl8139.h"
   4
   5 /* State management variables. */
   6 EXTERN re_t re_state;
   7
   8 /* Custom states definition. */
   9 #define RL_STATE_READ_PROTOCOL_FREE     (SEF_LU_STATE_CUSTOM_BASE + 0)
  10 #define RL_STATE_WRITE_PROTOCOL_FREE    (SEF_LU_STATE_CUSTOM_BASE + 1)
  11 #define RL_STATE_IS_CUSTOM(s) \
  12     ((s) >= RL_STATE_READ_PROTOCOL_FREE && (s) <= RL_STATE_WRITE_PROTOCOL_FREE)
  13
  14 /* State management helpers. */
  15 static int is_reading;
  16 static int is_writing;
  17
  18 static void load_state_info(void)
  19 {
  20   re_t *rep;
  21
  22   /* Check if we are reading or writing. */
  23   rep = &re_state;
  24
  25   is_reading = !!(rep->re_flags & REF_READING);
  26   is_writing = !!(rep->re_flags & REF_SEND_AVAIL);
  27 }
  28
  29 /*===========================================================================*
  30  *                               sef_cb_lu_prepare                           *
  31  *===========================================================================*/
  32 int sef_cb_lu_prepare(int state)
  33 {
  34   int is_ready;
  35
  36   /* Load state information. */
  37   load_state_info();
  38
  39   /* Check if we are ready for the target state. */
  40   is_ready = FALSE;
  41   switch(state) {
  42       /* Standard states. */
  43       case SEF_LU_STATE_REQUEST_FREE:
  44           is_ready = TRUE;
  45       break;
  46
  47       case SEF_LU_STATE_PROTOCOL_FREE:
  48           is_ready = (!is_reading && !is_writing);
  49       break;
  50
  51       /* Custom states. */
  52       case RL_STATE_READ_PROTOCOL_FREE:
  53           is_ready = (!is_reading);
  54       break;
  55
  56       case RL_STATE_WRITE_PROTOCOL_FREE:
  57           is_ready = (!is_writing);
  58       break;
  59   }
  60
  61   /* Tell SEF if we are ready. */
  62   return is_ready ? OK : ENOTREADY;
  63 }
  64
  65 /*===========================================================================*
  66  *                        sef_cb_lu_state_isvalid                            *
  67  *===========================================================================*/
  68 int sef_cb_lu_state_isvalid(int state, int UNUSED(flags))
  69 {
  70   return SEF_LU_STATE_IS_STANDARD(state) || RL_STATE_IS_CUSTOM(state);
  71 }
  72
  73 /*===========================================================================*
  74  *                         sef_cb_lu_state_dump                              *
  75  *===========================================================================*/
  76 void sef_cb_lu_state_dump(int state)
  77 {
  78   /* Load state information. */
  79   load_state_info();
  80
  81   sef_lu_dprint("rtl8139: live update state = %d\n", state);
  82   sef_lu_dprint("rtl8139: is_reading = %d\n", is_reading);
  83   sef_lu_dprint("rtl8139: is_writing = %d\n", is_writing);
  84
  85   sef_lu_dprint("rtl8139: SEF_LU_STATE_WORK_FREE(%d) reached = %d\n",
  86       SEF_LU_STATE_WORK_FREE, TRUE);
  87   sef_lu_dprint("rtl8139: SEF_LU_STATE_REQUEST_FREE(%d) reached = %d\n",
  88       SEF_LU_STATE_REQUEST_FREE, TRUE);
  89   sef_lu_dprint("rtl8139: SEF_LU_STATE_PROTOCOL_FREE(%d) reached = %d\n",
  90       SEF_LU_STATE_PROTOCOL_FREE, (!is_reading && !is_writing));
  91   sef_lu_dprint("rtl8139: RL_STATE_READ_PROTOCOL_FREE(%d) reached = %d\n",
  92       RL_STATE_READ_PROTOCOL_FREE, (!is_reading));
  93   sef_lu_dprint("rtl8139: RL_STATE_WRITE_PROTOCOL_FREE(%d) reached = %d\n",
  94       RL_STATE_WRITE_PROTOCOL_FREE, (!is_writing));
  95 }
  96