plat/kvm/arm: Add UEFI entry stub

Implements the small ARM specific UEFI entry point which will call
the early self relocator, and jump to the architecture generic EFI
stub.

Signed-off-by: Sergiu Moga <sergiu.moga@protonmail.com>
Reviewed-by: Michalis Pappas <michalis@unikraft.io>
Approved-by: Razvan Deaconescu <razvand@unikraft.io>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Closes: #909

diff --git a/plat/kvm/arm/efi_entry64.S b/plat/kvm/arm/efi_entry64.S
new file mode 100644 (file)
index 0000000..b266ffd
--- /dev/null
+++ b/plat/kvm/arm/efi_entry64.S
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2023, Unikraft GmbH and The Unikraft Authors.
+ * Licensed under the BSD-3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ */
+#include <uk/config.h>
+#include <uk/asm.h>
+
+.section .text
+ENTRY(uk_efi_entry64)
+       stp     x0, x1, [sp, #16]
+
+       mov     x0, xzr
+       mov     x1, xzr
+       bl      do_uk_reloc
+       ldp     x0, x1, [sp, #16]
+
+       bl      uk_efi_main
+
+uk_efi_fail:
+       wfi
+       b       uk_efi_fail
+END(uk_efi_entry64)