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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., 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 <string.h>
#include <pxe.h>
#include <realmode.h>
#include <bios.h>
#include <pnpbios.h>
#include <basemem.h>
#include <ipxe/pci.h>
#include <undi.h>
#include <undirom.h>
#include <undiload.h>
/** @file
*
* UNDI load/unload
*
*/
/* Disambiguate the various error causes */
#define EINFO_EUNDILOAD \
__einfo_uniqify ( EINFO_EPLATFORM, 0x01, \
"UNDI loader error" )
#define EUNDILOAD( status ) EPLATFORM ( EINFO_EUNDILOAD, status )
/** Parameter block for calling UNDI loader */
static struct s_UNDI_LOADER __bss16 ( undi_loader );
#define undi_loader __use_data16 ( undi_loader )
/** UNDI loader entry point */
static SEGOFF16_t __bss16 ( undi_loader_entry );
#define undi_loader_entry __use_data16 ( undi_loader_entry )
/**
* Call UNDI loader to create a pixie
*
* @v undi UNDI device
* @v undirom UNDI ROM
* @ret rc Return status code
*/
int undi_load ( struct undi_device *undi, struct undi_rom *undirom ) {
struct s_PXE ppxe;
unsigned int fbms_seg;
uint16_t exit;
int rc;
/* Only one UNDI instance may be loaded at any given time */
if ( undi_loader_entry.segment ) {
DBG ( "UNDI %p cannot load multiple instances\n", undi );
return -EBUSY;
}
/* Set up START_UNDI parameters */
memset ( &undi_loader, 0, sizeof ( undi_loader ) );
undi_loader.AX = undi->pci_busdevfn;
undi_loader.BX = undi->isapnp_csn;
undi_loader.DX = undi->isapnp_read_port;
undi_loader.ES = BIOS_SEG;
undi_loader.DI = find_pnp_bios();
/* Allocate base memory for PXE stack */
undi->restore_fbms = get_fbms();
fbms_seg = ( undi->restore_fbms << 6 );
fbms_seg -= ( ( undirom->code_size + 0x0f ) >> 4 );
undi_loader.UNDI_CS = fbms_seg;
fbms_seg -= ( ( undirom->data_size + 0x0f ) >> 4 );
undi_loader.UNDI_DS = fbms_seg;
/* Debug info */
DBGC ( undi, "UNDI %p loading UNDI ROM %p to CS %04x DS %04x for ",
undi, undirom, undi_loader.UNDI_CS, undi_loader.UNDI_DS );
if ( undi->pci_busdevfn != UNDI_NO_PCI_BUSDEVFN ) {
unsigned int bus = ( undi->pci_busdevfn >> 8 );
unsigned int devfn = ( undi->pci_busdevfn & 0xff );
DBGC ( undi, "PCI %02x:%02x.%x\n",
bus, PCI_SLOT ( devfn ), PCI_FUNC ( devfn ) );
}
if ( undi->isapnp_csn != UNDI_NO_ISAPNP_CSN ) {
DBGC ( undi, "ISAPnP(%04x) CSN %04x\n",
undi->isapnp_read_port, undi->isapnp_csn );
}
/* Call loader */
undi_loader_entry = undirom->loader_entry;
__asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
"pushw %%ds\n\t"
"pushw %%ax\n\t"
"lcall *undi_loader_entry\n\t"
"popl %%ebp\n\t" /* discard */
"popl %%ebp\n\t" /* gcc bug */ )
: "=a" ( exit )
: "a" ( __from_data16 ( &undi_loader ) )
: "ebx", "ecx", "edx", "esi", "edi" );
if ( exit != PXENV_EXIT_SUCCESS ) {
/* Clear entry point */
memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) );
rc = -EUNDILOAD ( undi_loader.Status );
DBGC ( undi, "UNDI %p loader failed: %s\n",
undi, strerror ( rc ) );
return rc;
}
/* Populate PXE device structure */
undi->pxenv = undi_loader.PXENVptr;
undi->ppxe = undi_loader.PXEptr;
copy_from_real ( &ppxe, undi->ppxe.segment, undi->ppxe.offset,
sizeof ( ppxe ) );
undi->entry = ppxe.EntryPointSP;
DBGC ( undi, "UNDI %p loaded PXENV+ %04x:%04x !PXE %04x:%04x "
"entry %04x:%04x\n", undi, undi->pxenv.segment,
undi->pxenv.offset, undi->ppxe.segment, undi->ppxe.offset,
undi->entry.segment, undi->entry.offset );
/* Update free base memory counter */
undi->fbms = ( fbms_seg >> 6 );
set_fbms ( undi->fbms );
DBGC ( undi, "UNDI %p using [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
return 0;
}
/**
* Unload a pixie
*
* @v undi UNDI device
* @ret rc Return status code
*
* Erases the PXENV+ and !PXE signatures, and frees the used base
* memory (if possible).
*/
int undi_unload ( struct undi_device *undi ) {
static uint32_t dead = 0xdeaddead;
DBGC ( undi, "UNDI %p unloading\n", undi );
/* Clear entry point */
memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) );
/* Erase signatures */
if ( undi->pxenv.segment )
put_real ( dead, undi->pxenv.segment, undi->pxenv.offset );
if ( undi->ppxe.segment )
put_real ( dead, undi->ppxe.segment, undi->ppxe.offset );
/* Free base memory, if possible */
if ( undi->fbms == get_fbms() ) {
DBGC ( undi, "UNDI %p freeing [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
set_fbms ( undi->restore_fbms );
return 0;
} else {
DBGC ( undi, "UNDI %p leaking [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
return -EBUSY;
}
}
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