From: Sergiu Moga <sergiu.moga@protonmail.com>
Date: Mon, 24 Apr 2023 05:42:49 +0000 (+0300)
Subject: plat/kvm/x86: Add UEFI entry stub
X-Git-Tag: RELEASE-0.14.0~75
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=1eefc342d29121bd1e8f97ce7f4f62c083ecc26f;p=unikraft%2Funikraft.git

plat/kvm/x86: Add UEFI entry stub

Implements the small x86 specific UEFI entry point which will call
the early self relocator, adjust the initially unaligned stack and
finally 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/x86/efi_entry64.S b/plat/kvm/x86/efi_entry64.S
new file mode 100644
index 000000000..4e184d372
--- /dev/null
+++ b/plat/kvm/x86/efi_entry64.S
@@ -0,0 +1,27 @@
+/* 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)
+	/* EFI gives us a stack misaligned by 8 */
+	and	$~0xf, %rsp
+
+	xorq	%rdi, %rdi
+	xorq	%rsi, %rsi
+	pushq	%rdx
+	pushq	%rcx
+	call	do_uk_reloc
+	popq	%rcx
+	popq	%rdx
+
+	call	uk_efi_main
+
+uk_efi_fail:
+	hlt
+	jmp	uk_efi_fail
+END(uk_efi_entry64)