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arch/arm: Add support for loading Linux kernels

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Adds support for loading Linux kernels through FIT payloads. This has
been implemented as an assembly function in order to simplify dealing
with some of the intricacies of loading a kernel (such as needing to
jump to the kernel in ARM mode and the kernel ABI).

TEST: Booted a FIT image containing a 5.4 kernel and initramfs on the
Beaglebone Black.

Change-Id: I7dbf9467665ec17447cec73676763844b4be4764
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45335
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Sam Lewis
2020-09-14 21:04:35 +10:00
committed by Patrick Georgi
parent d5dda47db8
commit 362a156867
3 changed files with 42 additions and 2 deletions
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22
src/arch/arm/boot.c
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@@ -1,14 +1,32 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbfs.h>
#include <arch/cache.h>
#include <program_loading.h>
void boot_linux(void *kernel_ptr, void *fdt_ptr);
void arch_prog_run(struct prog *prog)
{
void (*doit)(void *);
cache_sync_instructions();
doit = prog_entry(prog);
doit(prog_entry_arg(prog));
switch (prog_cbfs_type(prog)) {
case CBFS_TYPE_FIT:
/*
* We only load Linux payloads from the ramstage, so provide a hint to
* the linker that the below functions do not need to be included in
* earlier stages.
*/
if (!ENV_RAMSTAGE)
break;
dcache_mmu_disable();
boot_linux(prog_entry(prog), prog_entry_arg(prog));
break;
default:
doit = prog_entry(prog);
doit(prog_entry_arg(prog));
}
}