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[riscv] Hold virtual address offset in the thread pointer register

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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>
This commit is contained in:
Michael Brown
2025-05-11 13:04:51 +01:00
parent f988ec09e0
commit 95ede670bc
8 changed files with 143 additions and 155 deletions
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6
src/core/fdt.c
View File

@@ -29,6 +29,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <byteswap.h>
#include <ipxe/netdevice.h>
#include <ipxe/image.h>
#include <ipxe/uaccess.h>
#include <ipxe/umalloc.h>
#include <ipxe/fdt.h>
@@ -734,8 +735,9 @@ int fdt_parse ( struct fdt *fdt, struct fdt_header *hdr, size_t max_len ) {
fdt->len, max_len );
goto err;
}
DBGC ( fdt, "FDT version %d at %p+%#04zx\n",
be32_to_cpu ( hdr->version ), fdt->hdr, fdt->len );
DBGC ( fdt, "FDT version %d at %p+%#04zx (phys %#08lx)\n",
be32_to_cpu ( hdr->version ), fdt->hdr, fdt->len,
virt_to_phys ( hdr ) );
/* Check signature */
if ( hdr->magic != cpu_to_be32 ( FDT_MAGIC ) ) {

4
src/core/uaccess.c
View File

@@ -34,3 +34,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/* Flat address space user access API */
PROVIDE_UACCESS_INLINE ( flat, phys_to_virt );
PROVIDE_UACCESS_INLINE ( flat, virt_to_phys );
/* Virtual address offset user access API */
PROVIDE_UACCESS_INLINE ( offset, phys_to_virt );
PROVIDE_UACCESS_INLINE ( offset, virt_to_phys );

36
src/core/virt_offset.c
View File

@@ -1,36 +0,0 @@
/*
* Copyright (C) 2025 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 <ipxe/uaccess.h>
/**
* @file
*
* Virtual offset memory model
*
*/
PROVIDE_UACCESS_INLINE ( offset, phys_to_virt );
PROVIDE_UACCESS_INLINE ( offset, virt_to_phys );