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armv8: Support loading 32-bit OS in AArch32 execution state

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To support loading a 32-bit OS, the execution state will change from
AArch64 to AArch32 when jumping to kernel.

The architecture information will be got through checking FIT image,
then U-Boot will load 32-bit OS or 64-bit OS automatically.

Signed-off-by: Ebony Zhu <ebony.zhu@nxp.com>
Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Alison Wang
2016-11-10 10:49:03 +08:00
committed by York Sun
parent 95e74a3df7
commit ec6617c397
11 changed files with 418 additions and 73 deletions
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23
cmd/bootefi.c
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@@ -141,6 +141,18 @@ static void *copy_fdt(void *fdt)
return new_fdt;
}
#ifdef CONFIG_ARM64
static unsigned long efi_run_in_el2(ulong (*entry)(void *image_handle,
struct efi_system_table *st), void *image_handle,
struct efi_system_table *st)
{
/* Enable caches again */
dcache_enable();
return entry(image_handle, st);
}
#endif
/*
* Load an EFI payload into a newly allocated piece of memory, register all
* EFI objects it would want to access and jump to it.
@@ -231,9 +243,14 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt)
if (current_el() == 3) {
smp_kick_all_cpus();
dcache_disable(); /* flush cache before switch to EL2 */
armv8_switch_to_el2();
/* Enable caches again */
dcache_enable();
/* Move into EL2 and keep running there */
armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info,
(ulong)&systab, (ulong)efi_run_in_el2,
ES_TO_AARCH64);
/* Should never reach here, efi exits with longjmp */
while (1) { }
}
#endif