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