mirror of
https://github.com/ipxe/ipxe
synced 2025-12-26 09:32:33 +03:00
Add PXE driver-scanning code, capable of locating all PXE ROMs in a system
and matching them up to (e.g. PCI) devices.
This commit is contained in:
Michael Brown
223
src/arch/i386/drivers/bus/pxedrv.c
Normal file
223
src/arch/i386/drivers/bus/pxedrv.c
Normal file
@@ -0,0 +1,223 @@
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <pxe.h>
|
||||
#include <realmode.h>
|
||||
|
||||
/** @file
|
||||
*
|
||||
* PXE drivers
|
||||
*
|
||||
*/
|
||||
|
||||
static LIST_HEAD ( pxe_drivers );
|
||||
|
||||
/**
|
||||
* Parse PXE ROM ID structure
|
||||
*
|
||||
* @v pxedrv PXE driver
|
||||
* @v pxeromid Offset within ROM to PXE ROM ID structure
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int pxedrv_parse_pxeromid ( struct pxe_driver *pxedrv,
|
||||
unsigned int pxeromid ) {
|
||||
struct undi_rom_id undi_rom_id;
|
||||
unsigned int undiloader;
|
||||
|
||||
DBGC ( pxedrv, "PXEDRV %p has PXE ROM ID at %04x:%04x\n", pxedrv,
|
||||
pxedrv->rom_segment, pxeromid );
|
||||
|
||||
/* Read PXE ROM ID structure and verify */
|
||||
copy_from_real ( &undi_rom_id, pxedrv->rom_segment, pxeromid,
|
||||
sizeof ( undi_rom_id ) );
|
||||
if ( undi_rom_id.Signature != UNDI_ROM_ID_SIGNATURE ) {
|
||||
DBGC ( pxedrv, "PXEDRV %p has bad PXE ROM ID signature "
|
||||
"%08lx\n", pxedrv, undi_rom_id.Signature );
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Check for UNDI loader */
|
||||
undiloader = undi_rom_id.UNDILoader;
|
||||
if ( ! undiloader ) {
|
||||
DBGC ( pxedrv, "PXEDRV %p has no UNDI loader\n", pxedrv );
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Fill in PXE driver loader fields */
|
||||
pxedrv->loader.segment = pxedrv->rom_segment;
|
||||
pxedrv->loader.offset = undiloader;
|
||||
pxedrv->code_size = undi_rom_id.CodeSize;
|
||||
pxedrv->data_size = undi_rom_id.DataSize;
|
||||
|
||||
DBGC ( pxedrv, "PXEDRV %p has UNDI loader at %04x:%04x "
|
||||
"(code %04x data %04x)\n", pxedrv, pxedrv->loader.segment,
|
||||
pxedrv->loader.offset, pxedrv->code_size, pxedrv->data_size );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse PCI expansion header
|
||||
*
|
||||
* @v pxedrv PXE driver
|
||||
* @v pcirheader Offset within ROM to PCI expansion header
|
||||
*/
|
||||
static int pxedrv_parse_pcirheader ( struct pxe_driver *pxedrv,
|
||||
unsigned int pcirheader ) {
|
||||
struct pcir_header pcir_header;
|
||||
|
||||
DBGC ( pxedrv, "PXEDRV %p has PCI expansion header at %04x:%04x\n",
|
||||
pxedrv, pxedrv->rom_segment, pcirheader );
|
||||
|
||||
/* Read PCI expansion header and verify */
|
||||
copy_from_real ( &pcir_header, pxedrv->rom_segment, pcirheader,
|
||||
sizeof ( pcir_header ) );
|
||||
if ( pcir_header.signature != PCIR_SIGNATURE ) {
|
||||
DBGC ( pxedrv, "PXEDRV %p has bad PCI expansion header "
|
||||
"signature %08lx\n", pxedrv, pcir_header.signature );
|
||||
return -EINVAL;
|
||||
}
|
||||
DBGC ( pxedrv, "PXEDRV %p is a PCI ROM\n", pxedrv );
|
||||
|
||||
/* Fill in PXE driver PCI device fields */
|
||||
pxedrv->bus_type = PCI_NIC;
|
||||
pxedrv->bus_id.pci.vendor_id = pcir_header.vendor_id;
|
||||
pxedrv->bus_id.pci.device_id = pcir_header.device_id;
|
||||
|
||||
DBGC ( pxedrv, "PXEDRV %p is for PCI devices %04x:%04x\n", pxedrv,
|
||||
pxedrv->bus_id.pci.vendor_id, pxedrv->bus_id.pci.device_id );
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Create PXE driver for expansion ROM
|
||||
*
|
||||
* @v rom_segment ROM segment address
|
||||
* @ret rc Return status code
|
||||
*/
|
||||
static int pxedrv_probe_rom ( unsigned int rom_segment ) {
|
||||
struct pxe_driver *pxedrv = NULL;
|
||||
struct undi_rom rom;
|
||||
unsigned int pxeromid;
|
||||
unsigned int pcirheader;
|
||||
int rc;
|
||||
|
||||
/* Read expansion ROM header and verify */
|
||||
copy_from_real ( &rom, rom_segment, 0, sizeof ( rom ) );
|
||||
if ( rom.Signature != ROM_SIGNATURE ) {
|
||||
rc = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* Allocate memory for PXE driver */
|
||||
pxedrv = malloc ( sizeof ( *pxedrv ) );
|
||||
if ( ! pxedrv ) {
|
||||
DBG ( "Could not allocate PXE driver structure\n" );
|
||||
rc = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
memset ( pxedrv, 0, sizeof ( *pxedrv ) );
|
||||
DBGC ( pxedrv, "PXEDRV %p using expansion ROM at %04x:0000 (%zdkB)\n",
|
||||
pxedrv, rom_segment, ( rom.ROMLength / 2 ) );
|
||||
pxedrv->rom_segment = rom_segment;
|
||||
|
||||
/* Check for and parse PXE ROM ID */
|
||||
pxeromid = rom.PXEROMID;
|
||||
if ( ! pxeromid ) {
|
||||
DBGC ( pxedrv, "PXEDRV %p has no PXE ROM ID\n", pxedrv );
|
||||
rc = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
if ( ( rc = pxedrv_parse_pxeromid ( pxedrv, pxeromid ) ) != 0 )
|
||||
goto err;
|
||||
|
||||
/* Parse PCIR header, if present */
|
||||
pcirheader = rom.PCIRHeader;
|
||||
if ( pcirheader )
|
||||
pxedrv_parse_pcirheader ( pxedrv, pcirheader );
|
||||
|
||||
/* Add to PXE driver list and return */
|
||||
DBGC ( pxedrv, "PXEDRV %p registered\n", pxedrv );
|
||||
list_add ( &pxedrv->list, &pxe_drivers );
|
||||
return 0;
|
||||
|
||||
err:
|
||||
free ( pxedrv );
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* Create PXE drivers for all possible expansion ROMs
|
||||
*
|
||||
* @ret
|
||||
*/
|
||||
static void pxedrv_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 2kB intervals */
|
||||
for ( rom_segment = 0xc000 ; rom_segment < 0x10000 ;
|
||||
rom_segment += 0x80 ) {
|
||||
pxedrv_probe_rom ( rom_segment );
|
||||
}
|
||||
|
||||
probed = 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* Find PXE driver 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 pxedrv PXE driver, or NULL
|
||||
*/
|
||||
struct pxe_driver * pxedrv_find_pci_driver ( unsigned int vendor_id,
|
||||
unsigned int device_id,
|
||||
unsigned int rombase ) {
|
||||
struct pxe_driver *pxedrv;
|
||||
|
||||
pxedrv_probe_all_roms();
|
||||
|
||||
list_for_each_entry ( pxedrv, &pxe_drivers, list ) {
|
||||
if ( pxedrv->bus_type != PCI_NIC )
|
||||
continue;
|
||||
if ( pxedrv->bus_id.pci.vendor_id != vendor_id )
|
||||
continue;
|
||||
if ( pxedrv->bus_id.pci.device_id != device_id )
|
||||
continue;
|
||||
if ( rombase && ( ( pxedrv->rom_segment << 4 ) != rombase ) )
|
||||
continue;
|
||||
DBGC ( pxedrv, "PXEDRV %p matched PCI %04x:%04x (%08x)\n",
|
||||
pxedrv, vendor_id, device_id, rombase );
|
||||
return pxedrv;
|
||||
}
|
||||
|
||||
DBG ( "No PXE driver matched PCI %04x:%04x (%08x)\n",
|
||||
vendor_id, device_id, rombase );
|
||||
return NULL;
|
||||
}
|
||||
Reference in New Issue
Block a user