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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/**
* @file
*
* Hyper Text Transfer Protocol (HTTP) block device
*
*/
#include <stdint.h>
#include <ipxe/uaccess.h>
#include <ipxe/blocktrans.h>
#include <ipxe/blockdev.h>
#include <ipxe/acpi.h>
#include <ipxe/http.h>
/** Block size used for HTTP block device requests */
#define HTTP_BLKSIZE 512
/**
* Read from block device
*
* @v http HTTP transaction
* @v data Data interface
* @v lba Starting logical block address
* @v count Number of logical blocks
* @v buffer Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
int http_block_read ( struct http_transaction *http, struct interface *data,
uint64_t lba, unsigned int count, userptr_t buffer,
size_t len ) {
struct http_request_range range;
int rc;
/* Sanity check */
assert ( len == ( count * HTTP_BLKSIZE ) );
/* Construct request range descriptor */
range.start = ( lba * HTTP_BLKSIZE );
range.len = len;
/* Start a range request to retrieve the block(s) */
if ( ( rc = http_open ( data, &http_get, http->uri, &range,
NULL ) ) != 0 )
goto err_open;
/* Insert block device translator */
if ( ( rc = block_translate ( data, buffer, len ) ) != 0 ) {
DBGC ( http, "HTTP %p could not insert block translator: %s\n",
http, strerror ( rc ) );
goto err_translate;
}
return 0;
err_translate:
intf_restart ( data, rc );
err_open:
return rc;
}
/**
* Read block device capacity
*
* @v control Control interface
* @v data Data interface
* @ret rc Return status code
*/
int http_block_read_capacity ( struct http_transaction *http,
struct interface *data ) {
int rc;
/* Start a HEAD request to retrieve the capacity */
if ( ( rc = http_open ( data, &http_head, http->uri, NULL,
NULL ) ) != 0 )
goto err_open;
/* Insert block device translator */
if ( ( rc = block_translate ( data, UNULL, HTTP_BLKSIZE ) ) != 0 ) {
DBGC ( http, "HTTP %p could not insert block translator: %s\n",
http, strerror ( rc ) );
goto err_translate;
}
return 0;
err_translate:
intf_restart ( data, rc );
err_open:
return rc;
}
/**
* Describe device in ACPI table
*
* @v http HTTP transaction
* @v acpi ACPI table
* @v len Length of ACPI table
* @ret rc Return status code
*/
int http_acpi_describe ( struct http_transaction *http,
struct acpi_description_header *acpi, size_t len ) {
DBGC ( http, "HTTP %p cannot yet describe device in an ACPI table\n",
http );
( void ) acpi;
( void ) len;
return 0;
}
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