99 lines
3 KiB
C
99 lines
3 KiB
C
/* This file contains the singlethreaded device driver interface.
|
|
*
|
|
* Changes:
|
|
* Aug 27, 2011 extracted from driver.c (A. Welzel)
|
|
*
|
|
* The entry points into this file are:
|
|
* blockdriver_task: the main message loop of the driver
|
|
* blockdriver_terminate: break out of the main message loop
|
|
* blockdriver_handle_msg: handle a single received message
|
|
* blockdriver_receive_mq: message receive interface with message queueing
|
|
* blockdriver_mq_queue: queue an incoming message for later processing
|
|
*/
|
|
|
|
#include <minix/drivers.h>
|
|
#include <minix/blockdriver.h>
|
|
|
|
#include "const.h"
|
|
#include "driver.h"
|
|
#include "mq.h"
|
|
|
|
static int running;
|
|
|
|
/*===========================================================================*
|
|
* blockdriver_receive_mq *
|
|
*===========================================================================*/
|
|
int blockdriver_receive_mq(message *m_ptr, int *status_ptr)
|
|
{
|
|
/* receive() interface for drivers with message queueing. */
|
|
|
|
/* Any queued messages? */
|
|
if (mq_dequeue(SINGLE_THREAD, m_ptr, status_ptr))
|
|
return OK;
|
|
|
|
/* Fall back to standard receive() interface otherwise. */
|
|
return driver_receive(ANY, m_ptr, status_ptr);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* blockdriver_terminate *
|
|
*===========================================================================*/
|
|
void blockdriver_terminate(void)
|
|
{
|
|
/* Break out of the main driver loop after finishing the current request. */
|
|
|
|
running = FALSE;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* blockdriver_task *
|
|
*===========================================================================*/
|
|
void blockdriver_task(struct blockdriver *bdp)
|
|
{
|
|
/* Main program of any block device driver task. */
|
|
int r, ipc_status;
|
|
message mess;
|
|
|
|
running = TRUE;
|
|
|
|
/* Here is the main loop of the disk task. It waits for a message, carries
|
|
* it out, and sends a reply.
|
|
*/
|
|
while (running) {
|
|
if ((r = blockdriver_receive_mq(&mess, &ipc_status)) != OK)
|
|
panic("blockdriver_receive_mq failed: %d", r);
|
|
|
|
blockdriver_process(bdp, &mess, ipc_status);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* blockdriver_process *
|
|
*===========================================================================*/
|
|
void blockdriver_process(struct blockdriver *bdp, message *m_ptr,
|
|
int ipc_status)
|
|
{
|
|
/* Handle the given received message. */
|
|
int r;
|
|
|
|
/* Process the notification or request. */
|
|
if (is_ipc_notify(ipc_status)) {
|
|
blockdriver_handle_notify(bdp, m_ptr);
|
|
|
|
/* Do not reply to notifications. */
|
|
} else {
|
|
r = blockdriver_handle_request(bdp, m_ptr, SINGLE_THREAD);
|
|
|
|
blockdriver_reply(m_ptr, ipc_status, r);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* blockdriver_mq_queue *
|
|
*===========================================================================*/
|
|
int blockdriver_mq_queue(message *m, int status)
|
|
{
|
|
/* Queue a message for later processing. */
|
|
|
|
return mq_enqueue(SINGLE_THREAD, m, status);
|
|
}
|