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author | Michael Brown | 2016-02-16 16:19:01 +0100 |
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committer | Michael Brown | 2016-02-16 20:32:32 +0100 |
commit | f468f12b1eca15e703aa2a79f1c82969c04c2322 (patch) | |
tree | f1868e6cb7debaeb7aca59e4488b603fcc6481d7 /src/arch/x86/core/cachedhcp.c | |
parent | [bios] Move isolinux definitions to Makefile.pcbios (diff) | |
download | ipxe-f468f12b1eca15e703aa2a79f1c82969c04c2322.tar.gz ipxe-f468f12b1eca15e703aa2a79f1c82969c04c2322.tar.xz ipxe-f468f12b1eca15e703aa2a79f1c82969c04c2322.zip |
[bios] Add bin-x86_64-pcbios build platform
Move most arch/i386 files to arch/x86, and adjust the contents of the
Makefiles and the include/bits/*.h headers to reflect the new
locations.
This patch makes no substantive code changes, as can be seen using a
rename-aware diff (e.g. "git show -M5").
This patch does not make the pcbios platform functional for x86_64; it
merely allows it to compile without errors.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/x86/core/cachedhcp.c')
-rw-r--r-- | src/arch/x86/core/cachedhcp.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/arch/x86/core/cachedhcp.c b/src/arch/x86/core/cachedhcp.c new file mode 100644 index 00000000..ff35b925 --- /dev/null +++ b/src/arch/x86/core/cachedhcp.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) 2013 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 ); + +#include <stdint.h> +#include <stdlib.h> +#include <ipxe/dhcppkt.h> +#include <ipxe/init.h> +#include <ipxe/netdevice.h> +#include <realmode.h> +#include <pxe_api.h> + +/** @file + * + * Cached DHCP packet + * + */ + +/** Cached DHCPACK physical address + * + * This can be set by the prefix. + */ +uint32_t __bss16 ( cached_dhcpack_phys ); +#define cached_dhcpack_phys __use_data16 ( cached_dhcpack_phys ) + +/** Colour for debug messages */ +#define colour &cached_dhcpack_phys + +/** Cached DHCPACK */ +static struct dhcp_packet *cached_dhcpack; + +/** + * Cached DHCPACK startup function + * + */ +static void cachedhcp_init ( void ) { + struct dhcp_packet *dhcppkt; + struct dhcp_packet *tmp; + struct dhcphdr *dhcphdr; + size_t max_len; + size_t len; + + /* Do nothing if no cached DHCPACK is present */ + if ( ! cached_dhcpack_phys ) { + DBGC ( colour, "CACHEDHCP found no cached DHCPACK\n" ); + return; + } + + /* No reliable way to determine length before parsing packet; + * start by assuming maximum length permitted by PXE. + */ + max_len = sizeof ( BOOTPLAYER_t ); + + /* Allocate and populate DHCP packet */ + dhcppkt = zalloc ( sizeof ( *dhcppkt ) + max_len ); + if ( ! dhcppkt ) { + DBGC ( colour, "CACHEDHCP could not allocate copy\n" ); + return; + } + dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( *dhcppkt ) ); + copy_from_user ( dhcphdr, phys_to_user ( cached_dhcpack_phys ), 0, + max_len ); + dhcppkt_init ( dhcppkt, dhcphdr, max_len ); + + /* Shrink packet to required length. If reallocation fails, + * just continue to use the original packet and waste the + * unused space. + */ + len = dhcppkt_len ( dhcppkt ); + assert ( len <= max_len ); + tmp = realloc ( dhcppkt, ( sizeof ( *dhcppkt ) + len ) ); + if ( tmp ) + dhcppkt = tmp; + + /* Reinitialise packet at new address */ + dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( *dhcppkt ) ); + dhcppkt_init ( dhcppkt, dhcphdr, len ); + + /* Store as cached DHCPACK, and mark original copy as consumed */ + DBGC ( colour, "CACHEDHCP found cached DHCPACK at %08x+%zx\n", + cached_dhcpack_phys, len ); + cached_dhcpack = dhcppkt; + cached_dhcpack_phys = 0; +} + +/** + * Cached DHCPACK startup function + * + */ +static void cachedhcp_startup ( void ) { + + /* If cached DHCP packet was not claimed by any network device + * during startup, then free it. + */ + if ( cached_dhcpack ) { + DBGC ( colour, "CACHEDHCP freeing unclaimed cached DHCPACK\n" ); + dhcppkt_put ( cached_dhcpack ); + cached_dhcpack = NULL; + } +} + +/** Cached DHCPACK initialisation function */ +struct init_fn cachedhcp_init_fn __init_fn ( INIT_NORMAL ) = { + .initialise = cachedhcp_init, +}; + +/** Cached DHCPACK startup function */ +struct startup_fn cachedhcp_startup_fn __startup_fn ( STARTUP_LATE ) = { + .startup = cachedhcp_startup, +}; + +/** + * Apply cached DHCPACK to network device, if applicable + * + * @v netdev Network device + * @ret rc Return status code + */ +static int cachedhcp_probe ( struct net_device *netdev ) { + struct ll_protocol *ll_protocol = netdev->ll_protocol; + int rc; + + /* Do nothing unless we have a cached DHCPACK */ + if ( ! cached_dhcpack ) + return 0; + + /* Do nothing unless cached DHCPACK's MAC address matches this + * network device. + */ + if ( memcmp ( netdev->ll_addr, cached_dhcpack->dhcphdr->chaddr, + ll_protocol->ll_addr_len ) != 0 ) { + DBGC ( colour, "CACHEDHCP cached DHCPACK does not match %s\n", + netdev->name ); + return 0; + } + DBGC ( colour, "CACHEDHCP cached DHCPACK is for %s\n", netdev->name ); + + /* Register as DHCP settings for this network device */ + if ( ( rc = register_settings ( &cached_dhcpack->settings, + netdev_settings ( netdev ), + DHCP_SETTINGS_NAME ) ) != 0 ) { + DBGC ( colour, "CACHEDHCP could not register settings: %s\n", + strerror ( rc ) ); + return rc; + } + + /* Claim cached DHCPACK */ + dhcppkt_put ( cached_dhcpack ); + cached_dhcpack = NULL; + + return 0; +} + +/** Cached DHCP packet network device driver */ +struct net_driver cachedhcp_driver __net_driver = { + .name = "cachedhcp", + .probe = cachedhcp_probe, +}; |