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/*
* Copyright (C) 2007 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <pxe.h>
#include <realmode.h>
#include <undirom.h>
/** @file
*
* UNDI expansion ROMs
*
*/
/** List of all UNDI ROMs */
static LIST_HEAD ( undiroms );
/**
* Parse PXE ROM ID structure
*
* @v undirom UNDI ROM
* @v pxeromid Offset within ROM to PXE ROM ID structure
* @ret rc Return status code
*/
static int undirom_parse_pxeromid ( struct undi_rom *undirom,
unsigned int pxeromid ) {
struct undi_rom_id undi_rom_id;
unsigned int undiloader;
DBGC ( undirom, "UNDIROM %p has PXE ROM ID at %04x:%04x\n", undirom,
undirom->rom_segment, pxeromid );
/* Read PXE ROM ID structure and verify */
copy_from_real ( &undi_rom_id, undirom->rom_segment, pxeromid,
sizeof ( undi_rom_id ) );
if ( undi_rom_id.Signature != UNDI_ROM_ID_SIGNATURE ) {
DBGC ( undirom, "UNDIROM %p has bad PXE ROM ID signature "
"%08x\n", undirom, undi_rom_id.Signature );
return -EINVAL;
}
/* Check for UNDI loader */
undiloader = undi_rom_id.UNDILoader;
if ( ! undiloader ) {
DBGC ( undirom, "UNDIROM %p has no UNDI loader\n", undirom );
return -EINVAL;
}
/* Fill in UNDI ROM loader fields */
undirom->loader_entry.segment = undirom->rom_segment;
undirom->loader_entry.offset = undiloader;
undirom->code_size = undi_rom_id.CodeSize;
undirom->data_size = undi_rom_id.DataSize;
DBGC ( undirom, "UNDIROM %p has UNDI loader at %04x:%04x "
"(code %04zx data %04zx)\n", undirom,
undirom->loader_entry.segment, undirom->loader_entry.offset,
undirom->code_size, undirom->data_size );
return 0;
}
/**
* Parse PCI expansion header
*
* @v undirom UNDI ROM
* @v pcirheader Offset within ROM to PCI expansion header
*/
static int undirom_parse_pcirheader ( struct undi_rom *undirom,
unsigned int pcirheader ) {
struct pcir_header pcir_header;
DBGC ( undirom, "UNDIROM %p has PCI expansion header at %04x:%04x\n",
undirom, undirom->rom_segment, pcirheader );
/* Read PCI expansion header and verify */
copy_from_real ( &pcir_header, undirom->rom_segment, pcirheader,
sizeof ( pcir_header ) );
if ( pcir_header.signature != PCIR_SIGNATURE ) {
DBGC ( undirom, "UNDIROM %p has bad PCI expansion header "
"signature %08x\n", undirom, pcir_header.signature );
return -EINVAL;
}
/* Fill in UNDI ROM PCI device fields */
undirom->bus_type = PCI_NIC;
undirom->bus_id.pci.vendor_id = pcir_header.vendor_id;
undirom->bus_id.pci.device_id = pcir_header.device_id;
DBGC ( undirom, "UNDIROM %p is for PCI devices %04x:%04x\n", undirom,
undirom->bus_id.pci.vendor_id, undirom->bus_id.pci.device_id );
return 0;
}
/**
* Probe UNDI ROM
*
* @v rom_segment ROM segment address
* @ret rc Return status code
*/
static int undirom_probe ( unsigned int rom_segment ) {
struct undi_rom *undirom = NULL;
struct undi_rom_header romheader;
size_t rom_len;
unsigned int pxeromid;
unsigned int pcirheader;
int rc;
/* Read expansion ROM header and verify */
copy_from_real ( &romheader, rom_segment, 0, sizeof ( romheader ) );
if ( romheader.Signature != ROM_SIGNATURE ) {
rc = -EINVAL;
goto err;
}
rom_len = ( romheader.ROMLength * 512 );
/* Allocate memory for UNDI ROM */
undirom = zalloc ( sizeof ( *undirom ) );
if ( ! undirom ) {
DBG ( "Could not allocate UNDI ROM structure\n" );
rc = -ENOMEM;
goto err;
}
DBGC ( undirom, "UNDIROM %p trying expansion ROM at %04x:0000 "
"(%zdkB)\n", undirom, rom_segment, ( rom_len / 1024 ) );
undirom->rom_segment = rom_segment;
/* Check for and parse PXE ROM ID */
pxeromid = romheader.PXEROMID;
if ( ! pxeromid ) {
DBGC ( undirom, "UNDIROM %p has no PXE ROM ID\n", undirom );
rc = -EINVAL;
goto err;
}
if ( pxeromid > rom_len ) {
DBGC ( undirom, "UNDIROM %p PXE ROM ID outside ROM\n",
undirom );
rc = -EINVAL;
goto err;
}
if ( ( rc = undirom_parse_pxeromid ( undirom, pxeromid ) ) != 0 )
goto err;
/* Parse PCIR header, if present */
pcirheader = romheader.PCIRHeader;
if ( pcirheader )
undirom_parse_pcirheader ( undirom, pcirheader );
/* Add to UNDI ROM list and return */
DBGC ( undirom, "UNDIROM %p registered\n", undirom );
list_add ( &undirom->list, &undiroms );
return 0;
err:
free ( undirom );
return rc;
}
/**
* Create UNDI ROMs for all possible expansion ROMs
*
* @ret
*/
static void undirom_probe_all_roms ( void ) {
static int probed = 0;
unsigned int rom_segment;
/* Perform probe only once */
if ( probed )
return;
DBG ( "Scanning for PXE expansion ROMs\n" );
/* Scan through expansion ROM region at 512 byte intervals */
for ( rom_segment = 0xc000 ; rom_segment < 0x10000 ;
rom_segment += 0x20 ) {
undirom_probe ( rom_segment );
}
probed = 1;
}
/**
* Find UNDI ROM for PCI device
*
* @v vendor_id PCI vendor ID
* @v device_id PCI device ID
* @v rombase ROM base address, or 0 for any
* @ret undirom UNDI ROM, or NULL
*/
struct undi_rom * undirom_find_pci ( unsigned int vendor_id,
unsigned int device_id,
unsigned int rombase ) {
struct undi_rom *undirom;
undirom_probe_all_roms();
list_for_each_entry ( undirom, &undiroms, list ) {
if ( undirom->bus_type != PCI_NIC )
continue;
if ( undirom->bus_id.pci.vendor_id != vendor_id )
continue;
if ( undirom->bus_id.pci.device_id != device_id )
continue;
if ( rombase && ( ( undirom->rom_segment << 4 ) != rombase ) )
continue;
DBGC ( undirom, "UNDIROM %p matched PCI %04x:%04x (%08x)\n",
undirom, vendor_id, device_id, rombase );
return undirom;
}
DBG ( "No UNDI ROM matched PCI %04x:%04x (%08x)\n",
vendor_id, device_id, rombase );
return NULL;
}
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