65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*
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*
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* Copyright (C) 2012 secunet Security Networks AG
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* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <libpayload.h>
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#include <pci.h>
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#include <storage/ata.h>
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#include <storage/ahci.h>
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#include "ahci_private.h"
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ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
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const u8 *const cmd, const size_t cmdlen,
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u8 *const buf, const size_t buflen)
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{
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ahci_dev_t *const dev = (ahci_dev_t *)_dev;
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if ((cmdlen != 12) && (cmdlen != 16)) {
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printf("ahci: Only 12- and 16-byte packet commands allowed.\n");
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return -1;
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}
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const size_t len = ahci_cmdslot_prepare(dev, buf, buflen, 0);
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u16 byte_limit = MIN(len, 63 * 1024); /* like Linux */
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if (byte_limit & 1) ++byte_limit; /* even limit */
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dev->cmdlist[0].cmd |= CMD_ATAPI;
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dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
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dev->cmdtable->fis[1] = FIS_H2D_CMD;
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dev->cmdtable->fis[2] = ATA_PACKET;
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dev->cmdtable->fis[5] = byte_limit & 0xff;
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dev->cmdtable->fis[6] = byte_limit >> 8;
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memcpy((void *)dev->cmdtable->atapi_cmd, cmd, cmdlen);
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return ahci_cmdslot_exec(dev);
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}
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