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https://github.com/ipxe/ipxe
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95ede670bc
iPXE does not make use of any thread-local storage. Use the otherwise
unused thread pointer register ("tp") to hold the current value of
the virtual address offset, rather than using a global variable.
This ensures that virt_offset can be made valid even during very early
initialisation (when iPXE may be executing directly from read-only
memory and so cannot update a global variable).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/*
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* Copyright (C) 2024 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <ipxe/uaccess.h>
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/** @file
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*
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* iPXE user access API
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*
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*/
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/* Flat address space user access API */
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PROVIDE_UACCESS_INLINE ( flat, phys_to_virt );
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PROVIDE_UACCESS_INLINE ( flat, virt_to_phys );
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/* Virtual address offset user access API */
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PROVIDE_UACCESS_INLINE ( offset, phys_to_virt );
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PROVIDE_UACCESS_INLINE ( offset, virt_to_phys );
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