hw/fifo.h

   1 #ifndef FIFO_H
   2 #define FIFO_H
   3
   4 #include "hw.h"
   5
   6 typedef struct {
   7     /* All fields are private */
   8     uint8_t *data;
   9     uint32_t capacity;
  10     uint32_t head;
  11     uint32_t num;
  12 } Fifo8;
  13
  14 /**
  15  * fifo8_create:
  16  * @fifo: struct Fifo8 to initialise with new FIFO
  17  * @capacity: capacity of the newly created FIFO
  18  *
  19  * Create a FIFO of the specified size. Clients should call fifo8_destroy()
  20  * when finished using the fifo. The FIFO is initially empty.
  21  */
  22
  23 void fifo8_create(Fifo8 *fifo, uint32_t capacity);
  24
  25 /**
  26  * fifo8_destroy:
  27  * @fifo: FIFO to cleanup
  28  *
  29  * Cleanup a FIFO created with fifo8_create(). Frees memory created for FIFO
  30   *storage. The FIFO is no longer usable after this has been called.
  31  */
  32
  33 void fifo8_destroy(Fifo8 *fifo);
  34
  35 /**
  36  * fifo8_push:
  37  * @fifo: FIFO to push to
  38  * @data: data byte to push
  39  *
  40  * Push a data byte to the FIFO. Behaviour is undefined if the FIFO is full.
  41  * Clients are responsible for checking for fullness using fifo8_is_full().
  42  */
  43
  44 void fifo8_push(Fifo8 *fifo, uint8_t data);
  45
  46 /**
  47  * fifo8_pop:
  48  * @fifo: fifo to pop from
  49  *
  50  * Pop a data byte from the FIFO. Behaviour is undefined if the FIFO is empty.
  51  * Clients are responsible for checking for emptyness using fifo8_is_empty().
  52  *
  53  * Returns: The popped data byte.
  54  */
  55
  56 uint8_t fifo8_pop(Fifo8 *fifo);
  57
  58 /**
  59  * fifo8_reset:
  60  * @fifo: FIFO to reset
  61  *
  62  * Reset a FIFO. All data is discarded and the FIFO is emptied.
  63  */
  64
  65 void fifo8_reset(Fifo8 *fifo);
  66
  67 /**
  68  * fifo8_is_empty:
  69  * @fifo: FIFO to check
  70  *
  71  * Check if a FIFO is empty.
  72  *
  73  * Returns: True if the fifo is empty, false otherwise.
  74  */
  75
  76 bool fifo8_is_empty(Fifo8 *fifo);
  77
  78 /**
  79  * fifo8_is_full:
  80  * @fifo: FIFO to check
  81  *
  82  * Check if a FIFO is full.
  83  *
  84  * Returns: True if the fifo is full, false otherwise.
  85  */
  86
  87 bool fifo8_is_full(Fifo8 *fifo);
  88
  89 extern const VMStateDescription vmstate_fifo8;
  90
  91 #define VMSTATE_FIFO8(_field, _state) {                              \
  92     .name       = (stringify(_field)),                               \
  93     .size       = sizeof(Fifo8),                                     \
  94     .vmsd       = &vmstate_fifo8,                                    \
  95     .flags      = VMS_STRUCT,                                        \
  96     .offset     = vmstate_offset_value(_state, _field, Fifo8),       \
  97 }
  98
  99 #endif /* FIFO_H */