[PATCH v16 28/38] x86: Add early SHA-384/512 support for Secure Launch early measurements

[Ross Philipson <ross.philipson@gmail.com>]

From: "Daniel P. Smith" <dpsmith@apertussolutions.com>

On newer TPM 2 implementations, SHA 384 and 512 banks may be available
for use. If these banks are enabled in firmware, they will be used for
the Dynamic Launch. The DLME will also use these algorithms to measure
configuration information into the TPM as early as possible before using
the values. This implementation uses the established approach of #including
the SHA-512 library directly in the early boot code.

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Signed-off-by: Ross Philipson <ross.philipson@gmail.com>
---
 arch/x86/boot/startup/Makefile     | 1 +
 arch/x86/boot/startup/lib-sha512.c | 6 ++++++
 2 files changed, 7 insertions(+)
 create mode 100644 arch/x86/boot/startup/lib-sha512.c

diff --git a/arch/x86/boot/startup/Makefile b/arch/x86/boot/startup/Makefile
index 071a90f23ae0..527cba7e4560 100644
--- a/arch/x86/boot/startup/Makefile
+++ b/arch/x86/boot/startup/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_AMD_MEM_ENCRYPT)	+= sme.o sev-startup.o
 
 slaunch-objs			+= lib-sha1.o
 slaunch-objs			+= lib-sha256.o
+slaunch-objs			+= lib-sha512.o
 obj-$(CONFIG_SECURE_LAUNCH)	+= $(slaunch-objs)
 
 pi-objs				:= $(patsubst %.o,$(obj)/%.o,$(obj-y))
diff --git a/arch/x86/boot/startup/lib-sha512.c b/arch/x86/boot/startup/lib-sha512.c
new file mode 100644
index 000000000000..2afd5c5935cd
--- /dev/null
+++ b/arch/x86/boot/startup/lib-sha512.c
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2026 Apertus Solutions, LLC
+ */
+
+#include "../../../../lib/crypto/sha512.c"
-- 
2.47.3