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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
*
* 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 <libpayload.h>
#ifdef CONFIG_LP_STORAGE_AHCI
# include <storage/ahci.h>
#endif
#include <storage/storage.h>
static storage_dev_t **devices = NULL;
static size_t devices_length = 0;
static size_t dev_count = 0;
int storage_attach_device(storage_dev_t *const dev)
{
if (dev_count == devices_length) {
const size_t new_len =
(0 == devices_length) ? 4 : devices_length << 1;
storage_dev_t **const new_devices =
realloc(devices, new_len * sizeof(storage_dev_t *));
if (!new_devices)
return -1;
devices = new_devices;
memset(devices + devices_length, '\0',
(new_len - devices_length) * sizeof(storage_dev_t *));
devices_length = new_len;
}
devices[dev_count++] = dev;
return 0;
}
int storage_device_count(void)
{
return dev_count;
}
/**
* Probe for drive with given number
*
* Looks for a drive with number dev_num and polls for a medium
* in the drive if appropriate.
*
* @dev_num device number counted from 0
*/
storage_poll_t storage_probe(const size_t dev_num)
{
if (dev_num >= dev_count)
return POLL_NO_DEVICE;
else if (devices[dev_num]->poll)
return devices[dev_num]->poll(devices[dev_num]);
else
return POLL_MEDIUM_PRESENT;
}
/**
* Read 512-byte blocks
*
* Reads count blocks of 512 bytes from block start of drive dev_num
* into buf.
*
* @dev_num device number counted from 0
* @start number of first block to read from
* @count number of blocks to read
* @buf buffer where the read data should be written
*/
ssize_t storage_read_blocks512(const size_t dev_num,
const lba_t start, const size_t count,
unsigned char *const buf)
{
if ((dev_num < dev_count) && devices[dev_num]->read_blocks512)
return devices[dev_num]->read_blocks512(
devices[dev_num], start, count, buf);
else
return -1;
}
/**
* Initializes storage controllers
*
* This function should be called once at startup to bring up supported
* storage controllers.
*/
void storage_initialize(void)
{
#ifdef CONFIG_LP_STORAGE_AHCI
ahci_initialize();
#endif
}
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