Rev 2797 | Rev 3246 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed
/*
* Copyright (c) 2006 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup genericmm
* @{
*/
/**
* @file
* @brief RAM disk support.
*
* Support for RAM disk images.
*/
#include <lib/rd.h>
#include <byteorder.h>
#include <mm/frame.h>
#include <sysinfo/sysinfo.h>
#include <ddi/ddi.h>
#include <align.h>
static parea_t rd_parea; /**< Physical memory area for rd. */
/**
* RAM disk initialization routine. At this point, the RAM disk memory is shared
* and information about the share is provided as sysinfo values to the userspace
* tasks.
*/
int init_rd(rd_header_t *header, size_t size)
{
/* Identify RAM disk */
if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
(header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
return RE_INVALID;
/* Identify version */
if (header->version != RD_VERSION)
return RE_UNSUPPORTED;
uint32_t hsize;
uint64_t dsize;
switch (header->data_type) {
case RD_DATA_LSB:
hsize = uint32_t_le2host(header->header_size);
dsize = uint64_t_le2host(header->data_size);
break;
case RD_DATA_MSB:
hsize = uint32_t_be2host(header->header_size);
dsize = uint64_t_be2host(header->data_size);
break;
default:
return RE_UNSUPPORTED;
}
if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
return RE_UNSUPPORTED;
if (hsize > size)
return RE_INVALID;
if ((uint64_t) hsize + dsize > size)
dsize = size - hsize;
rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize), FRAME_SIZE);
rd_parea.vbase = (uintptr_t) ((void *) header + hsize);
rd_parea.frames = SIZE2FRAMES(dsize);
rd_parea.cacheable = true;
ddi_parea_register(&rd_parea);
sysinfo_set_item_val("rd", NULL, true);
sysinfo_set_item_val("rd.header_size", NULL, hsize);
sysinfo_set_item_val("rd.size", NULL, dsize);
sysinfo_set_item_val("rd.address.physical", NULL, (unative_t)
KA2PA((void *) header + hsize));
return RE_OK;
}
/** @}
*/