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[lkrn] Add basic support for the RISC-V Linux kernel image format

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The RISC-V and AArch64 bare-metal kernel images share a common header
format, and require essentially the same execution environment: loaded
close to the start of RAM, entered with paging disabled, and passed a
pointer to a flattened device tree that describes the hardware and any
boot arguments.

Implement basic support for executing bare-metal RISC-V and AArch64
kernel images.  The (trivial) AArch64-specific code path is untested
since we do not yet have the ability to build for any bare-metal
AArch64 platforms.  Constructing and passing an initramfs image is not
yet supported.

Rename the IMAGE_BZIMAGE build configuration option to IMAGE_LKRN,
since "bzImage" is specific to x86.  To retain backwards compatibility
with existing local build configurations, we leave IMAGE_BZIMAGE as
the enabled option in config/default/pcbios.h and treat IMAGE_LKRN as
a synonym for IMAGE_BZIMAGE when building for x86 BIOS.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-20 00:26:08 +01:00
parent d0c35b6823
commit ecac4a34c7
10 changed files with 460 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/config/config_pcbios.c
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@@ -22,6 +22,7 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <config/console.h>
#include <config/general.h>
/** @file
*
@@ -48,3 +49,13 @@ REQUIRE_OBJECT ( vesafb );
#ifdef CONSOLE_INT13
REQUIRE_OBJECT ( int13con );
#endif
/*
* Drag in all requested image types
*
*/
/* Allow IMAGE_LKRN to be a synonynm for IMAGE_BZIMAGE */
#ifdef IMAGE_LKRN
REQUIRE_OBJECT ( bzimage );
#endif

41
src/config/config_sbi.c
View File

@@ -0,0 +1,41 @@
/*
* 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 (at your option) 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 <config/general.h>
/** @file
*
* SBI-specific configuration options
*
*/
PROVIDE_REQUIRING_SYMBOL();
/*
* Drag in all requested image types
*
*/
#ifdef IMAGE_LKRN
REQUIRE_OBJECT ( lkrn );
#endif

2
src/config/defaults/sbi.h
View File

@@ -30,6 +30,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define TIME_NULL
#define IMAGE_SCRIPT
#define IMAGE_LKRN
#define IMAGE_GZIP
#define REBOOT_CMD
#define POWEROFF_CMD

2
src/config/general.h
View File

@@ -117,7 +117,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
//#define IMAGE_MULTIBOOT /* MultiBoot image support */
//#define IMAGE_PXE /* PXE image support */
//#define IMAGE_SCRIPT /* iPXE script image support */
//#define IMAGE_BZIMAGE /* Linux bzImage image support */
//#define IMAGE_LKRN /* Linux kernel image support */
//#define IMAGE_COMBOOT /* SYSLINUX COMBOOT image support */
//#define IMAGE_EFI /* EFI image support */
//#define IMAGE_SDI /* SDI image support */