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/*
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <libpayload.h>
#include <pci.h>
#include <storage/ata.h>
#include <storage/ahci.h>
#include "ahci_private.h"
ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
const u8 *const cmd, const size_t cmdlen,
u8 *const buf, const size_t buflen)
{
ahci_dev_t *const dev = (ahci_dev_t *)_dev;
if ((cmdlen != 12) && (cmdlen != 16)) {
printf("ahci: Only 12- and 16-byte packet commands allowed.\n");
return -1;
}
const size_t len = ahci_cmdslot_prepare(dev, buf, buflen, 0);
u16 byte_limit = MIN(len, 63 * 1024); /* like Linux */
if (byte_limit & 1) ++byte_limit; /* even limit */
dev->cmdlist[0].cmd |= CMD_ATAPI;
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ATA_PACKET;
dev->cmdtable->fis[5] = byte_limit & 0xff;
dev->cmdtable->fis[6] = byte_limit >> 8;
memcpy((void *)dev->cmdtable->atapi_cmd, cmd, cmdlen);
return ahci_cmdslot_exec(dev);
}
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