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/**
* @file
*
* @ingroup rtems_ramdisk
*
* @brief RAM disk block device implementation.
*/
/*
* Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
* Author: Victor V. Vengerov <vvv@oktet.ru>
*
* @(#) $Id$
*/
/* FIXME: How to set this define? */
#if !defined(RTEMS_RAMDISK_TRACE)
#define RTEMS_RAMDISK_TRACE 0
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#if RTEMS_RAMDISK_TRACE
#include <stdio.h>
#endif
#include <rtems.h>
#include <rtems/ramdisk.h>
#if RTEMS_RAMDISK_TRACE
static void
rtems_ramdisk_printf (const ramdisk *rd, const char *format, ...)
{
if (rd->trace)
{
va_list args;
va_start (args, format);
printf ("ramdisk:");
vprintf (format, args);
printf ("\n");
}
}
#endif
static int
ramdisk_read(struct ramdisk *rd, rtems_blkdev_request *req)
{
uint8_t *from = rd->area;
uint32_t i;
rtems_blkdev_sg_buffer *sg;
#if RTEMS_RAMDISK_TRACE
rtems_ramdisk_printf (rd, "ramdisk read: start=%d, blocks=%d",
req->bufs[0].block, req->bufnum);
#endif
for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++)
{
#if RTEMS_RAMDISK_TRACE
rtems_ramdisk_printf (rd, "ramdisk read: buf=%d block=%d length=%d off=%d addr=%p",
i, sg->block, sg->length, sg->block * rd->block_size,
from + (sg->block * rd->block_size));
#endif
memcpy(sg->buffer, from + (sg->block * rd->block_size), sg->length);
}
req->req_done(req->done_arg, RTEMS_SUCCESSFUL);
return 0;
}
static int
ramdisk_write(struct ramdisk *rd, rtems_blkdev_request *req)
{
uint8_t *to = rd->area;
uint32_t i;
rtems_blkdev_sg_buffer *sg;
#if RTEMS_RAMDISK_TRACE
rtems_ramdisk_printf (rd, "ramdisk write: start=%d, blocks=%d",
req->bufs[0].block, req->bufnum);
#endif
for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++)
{
#if RTEMS_RAMDISK_TRACE
rtems_ramdisk_printf (rd, "ramdisk write: buf=%d block=%d length=%d off=%d addr=%p",
i, sg->block, sg->length, sg->block * rd->block_size,
to + (sg->block * rd->block_size));
#endif
memcpy(to + (sg->block * rd->block_size), sg->buffer, sg->length);
}
req->req_done(req->done_arg, RTEMS_SUCCESSFUL);
return 0;
}
int
ramdisk_ioctl(rtems_disk_device *dd, uint32_t req, void *argp)
{
switch (req)
{
case RTEMS_BLKIO_REQUEST:
{
rtems_blkdev_request *r = argp;
struct ramdisk *rd = rtems_disk_get_driver_data(dd);
switch (r->req)
{
case RTEMS_BLKDEV_REQ_READ:
return ramdisk_read(rd, r);
case RTEMS_BLKDEV_REQ_WRITE:
return ramdisk_write(rd, r);
default:
errno = EINVAL;
return -1;
}
break;
}
default:
return rtems_blkdev_ioctl (dd, req, argp);
break;
}
errno = EINVAL;
return -1;
}
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