mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-25 04:30:02 +00:00
a3578d4a51
Added a FIFO API that can be used to create and operate byte FIFOs. Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
#ifndef FIFO_H
|
|
#define FIFO_H
|
|
|
|
#include "hw.h"
|
|
|
|
typedef struct {
|
|
/* All fields are private */
|
|
uint8_t *data;
|
|
uint32_t capacity;
|
|
uint32_t head;
|
|
uint32_t num;
|
|
} Fifo8;
|
|
|
|
/**
|
|
* fifo8_create:
|
|
* @fifo: struct Fifo8 to initialise with new FIFO
|
|
* @capacity: capacity of the newly created FIFO
|
|
*
|
|
* Create a FIFO of the specified size. Clients should call fifo8_destroy()
|
|
* when finished using the fifo. The FIFO is initially empty.
|
|
*/
|
|
|
|
void fifo8_create(Fifo8 *fifo, uint32_t capacity);
|
|
|
|
/**
|
|
* fifo8_destroy:
|
|
* @fifo: FIFO to cleanup
|
|
*
|
|
* Cleanup a FIFO created with fifo8_create(). Frees memory created for FIFO
|
|
*storage. The FIFO is no longer usable after this has been called.
|
|
*/
|
|
|
|
void fifo8_destroy(Fifo8 *fifo);
|
|
|
|
/**
|
|
* fifo8_push:
|
|
* @fifo: FIFO to push to
|
|
* @data: data byte to push
|
|
*
|
|
* Push a data byte to the FIFO. Behaviour is undefined if the FIFO is full.
|
|
* Clients are responsible for checking for fullness using fifo8_is_full().
|
|
*/
|
|
|
|
void fifo8_push(Fifo8 *fifo, uint8_t data);
|
|
|
|
/**
|
|
* fifo8_pop:
|
|
* @fifo: fifo to pop from
|
|
*
|
|
* Pop a data byte from the FIFO. Behaviour is undefined if the FIFO is empty.
|
|
* Clients are responsible for checking for emptyness using fifo8_is_empty().
|
|
*
|
|
* Returns: The popped data byte.
|
|
*/
|
|
|
|
uint8_t fifo8_pop(Fifo8 *fifo);
|
|
|
|
/**
|
|
* fifo8_reset:
|
|
* @fifo: FIFO to reset
|
|
*
|
|
* Reset a FIFO. All data is discarded and the FIFO is emptied.
|
|
*/
|
|
|
|
void fifo8_reset(Fifo8 *fifo);
|
|
|
|
/**
|
|
* fifo8_is_empty:
|
|
* @fifo: FIFO to check
|
|
*
|
|
* Check if a FIFO is empty.
|
|
*
|
|
* Returns: True if the fifo is empty, false otherwise.
|
|
*/
|
|
|
|
bool fifo8_is_empty(Fifo8 *fifo);
|
|
|
|
/**
|
|
* fifo8_is_full:
|
|
* @fifo: FIFO to check
|
|
*
|
|
* Check if a FIFO is full.
|
|
*
|
|
* Returns: True if the fifo is full, false otherwise.
|
|
*/
|
|
|
|
bool fifo8_is_full(Fifo8 *fifo);
|
|
|
|
extern const VMStateDescription vmstate_fifo8;
|
|
|
|
#define VMSTATE_FIFO8(_field, _state) { \
|
|
.name = (stringify(_field)), \
|
|
.size = sizeof(Fifo8), \
|
|
.vmsd = &vmstate_fifo8, \
|
|
.flags = VMS_STRUCT, \
|
|
.offset = vmstate_offset_value(_state, _field, Fifo8), \
|
|
}
|
|
|
|
#endif /* FIFO_H */
|