84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/** @file
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*
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* PXE UNDI loader
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*
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*/
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/*
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* Copyright (C) 2004 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pxe.h"
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/* PXENV_UNDI_LOADER
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*
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* Status: working
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*
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* NOTE: This is not a genuine PXE API call; the loader has a separate
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* entry point. However, to simplify the mapping of the PXE API to
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* the internal Etherboot API, both are directed through the same
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* interface.
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*/
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PXENV_EXIT_t undi_loader ( struct s_UNDI_LOADER *undi_loader ) {
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uint32_t loader_phys = virt_to_phys ( undi_loader );
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DBG ( "PXENV_UNDI_LOADER" );
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/* Set UNDI DS as our real-mode stack */
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use_undi_ds_for_rm_stack ( undi_loader->undi_ds );
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/* FIXME: These lines are borrowed from main.c. There should
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* probably be a single initialise() function that does all
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* this, but it's currently split interestingly between main()
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* and main_loop()...
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*/
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/* CHECKME: Our init functions have probably already been
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called by the ROM prefix's call to setup(), haven't
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they? */
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/* We have relocated; the loader pointer is now invalid */
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undi_loader = phys_to_virt ( loader_phys );
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/* Install PXE stack to area specified by NBP */
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install_pxe_stack ( VIRTUAL ( undi_loader->undi_cs, 0 ) );
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/* Call pxenv_start_undi to set parameters. Why the hell PXE
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* requires these parameters to be provided twice is beyond
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* the wit of any sane man. Don't worry if it fails; the NBP
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* should call PXENV_START_UNDI separately anyway.
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*/
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pxenv_start_undi ( &undi_loader->u.start_undi );
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/* Unhook stack; the loader is not meant to hook int 1a etc,
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* but the call the pxenv_start_undi will cause it to happen.
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*/
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/* FIXME: can't use ENSURE_CAN_UNLOAD() thanks to newer gcc's
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* barfing on unnamed struct/unions. */
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/* ENSURE_CAN_UNLOAD ( undi_loader ); */
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/* Fill in addresses of !PXE and PXENV+ structures */
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PTR_TO_SEGOFF16 ( &pxe_stack->pxe, undi_loader->pxe_ptr );
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PTR_TO_SEGOFF16 ( &pxe_stack->pxenv, undi_loader->pxenv_ptr );
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undi_loader->u.Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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