Add a small shared library that demonstrates the usage of the
IOCTL interface. This library can be linked to but, is
intended to be loaded and used by higher level languages
Acked-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
v4->v5:
* Pick up tag
v3->v4:
* New patch
---
tools/crypto/ccp/Makefile | 13 +++++++
tools/crypto/ccp/dbc.c | 72 +++++++++++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+)
create mode 100644 tools/crypto/ccp/Makefile
create mode 100644 tools/crypto/ccp/dbc.c
diff --git a/tools/crypto/ccp/Makefile b/tools/crypto/ccp/Makefile
new file mode 100644
index 0000000000000..ae4a66d1558a1
--- /dev/null
+++ b/tools/crypto/ccp/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+CFLAGS += -D__EXPORTED_HEADERS__ -I../../../include/uapi -I../../../include
+
+TARGET = dbc_library.so
+
+all: $(TARGET)
+
+dbc_library.so: dbc.c
+ $(CC) $(CFLAGS) $(LDFLAGS) -shared -o $@ $<
+ chmod -x $@
+
+clean:
+ $(RM) $(TARGET)
diff --git a/tools/crypto/ccp/dbc.c b/tools/crypto/ccp/dbc.c
new file mode 100644
index 0000000000000..37e813175642f
--- /dev/null
+++ b/tools/crypto/ccp/dbc.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Secure Processor Dynamic Boost Control sample library
+ *
+ * Copyright (C) 2023 Advanced Micro Devices, Inc.
+ *
+ * Author: Mario Limonciello <mario.limonciello@xxxxxxx>
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+/* if uapi header isn't installed, this might not yet exist */
+#ifndef __packed
+#define __packed __attribute__((packed))
+#endif
+#include <linux/psp-dbc.h>
+
+int get_nonce(int fd, void *nonce_out, void *signature)
+{
+ struct dbc_user_nonce tmp = {
+ .auth_needed = !!signature,
+ };
+ int ret;
+
+ assert(nonce_out);
+
+ if (signature)
+ memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+ ret = ioctl(fd, DBCIOCNONCE, &tmp);
+ if (ret)
+ return ret;
+ memcpy(nonce_out, tmp.nonce, sizeof(tmp.nonce));
+
+ return 0;
+}
+
+int set_uid(int fd, __u8 *uid, __u8 *signature)
+{
+ struct dbc_user_setuid tmp;
+
+ assert(uid);
+ assert(signature);
+
+ memcpy(tmp.uid, uid, sizeof(tmp.uid));
+ memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+ return ioctl(fd, DBCIOCUID, &tmp);
+}
+
+int process_param(int fd, int msg_index, __u8 *signature, int *data)
+{
+ struct dbc_user_param tmp = {
+ .msg_index = msg_index,
+ .param = *data,
+ };
+ int ret;
+
+ assert(signature);
+ assert(data);
+
+ memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+ ret = ioctl(fd, DBCIOCPARAM, &tmp);
+ if (ret)
+ return ret;
+
+ *data = tmp.param;
+ return 0;
+}
--
2.34.1
