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efi_loader: AArch64: Run EFI payloads in EL2 if U-Boot runs in EL3

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Some boards decided not to run ATF or other secure firmware in EL3, so
they instead run U-Boot there. The uEFI spec doesn't know what EL3 is
though - it only knows about EL2 and EL1. So if we see that we're running
in EL3, let's get into EL2 to make payloads happy.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Alexander Graf 2016-11-17 01:02:58 +01:00
parent 58ad86288f
commit 69bd459d34
1 changed files with 11 additions and 0 deletions
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11
cmd/bootefi.c
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@ -226,6 +226,17 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt)
return status == EFI_SUCCESS ? 0 : -EINVAL;
}
#ifdef CONFIG_ARM64
/* On AArch64 we need to make sure we call our payload in < EL3 */
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();
}
#endif
return entry(&loaded_image_info, &systab);
}