[U-Boot] [PATCH v4 01/12] optee: Add lib entries for sharing OPTEE code across ports

[Bryan O'Donoghue]

This patch adds code to lib to enable sharing of useful OPTEE code between
board-ports and architectures. The code on lib/optee/optee.c comes from the
TI omap2 port. Eventually the OMAP2 code will be patched to include the
shared code. The intention here is to add more useful OPTEE specific code
as more functionality gets added.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue at linaro.org>
Cc: Harinarayan Bhatta <harinarayan at ti.com>
Cc: Andrew F. Davis <afd at ti.com>
Cc: Tom Rini <trini at konsulko.com>
Cc: Kever Yang <kever.yang at rock-chips.com>
Cc: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
Cc: Peng Fan <peng.fan at nxp.com>
Tested-by: Peng Fan <peng.fan at nxp.com>
---
 include/tee/optee.h | 16 ++++++++++++++++
 lib/Kconfig         |  1 +
 lib/Makefile        |  1 +
 lib/optee/Kconfig   |  7 +++++++
 lib/optee/Makefile  |  7 +++++++
 lib/optee/optee.c   | 31 +++++++++++++++++++++++++++++++
 6 files changed, 63 insertions(+)
 create mode 100644 lib/optee/Kconfig
 create mode 100644 lib/optee/Makefile
 create mode 100644 lib/optee/optee.c

diff --git a/include/tee/optee.h b/include/tee/optee.h
index 9ab0d08..8943afb 100644
--- a/include/tee/optee.h
+++ b/include/tee/optee.h
@@ -10,6 +10,8 @@
 #ifndef	_OPTEE_H
 #define _OPTEE_H
 
+#include <linux/errno.h>
+
 #define OPTEE_MAGIC             0x4554504f
 #define OPTEE_VERSION           1
 #define OPTEE_ARCH_ARM32        0
@@ -27,4 +29,18 @@ struct optee_header {
 	uint32_t paged_size;
 };
 
+#if defined(CONFIG_OPTEE)
+int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
+		       unsigned long tzdram_len, unsigned long image_len);
+#else
+static inline int optee_verify_image(struct optee_header *hdr,
+				     unsigned long tzdram_start,
+				     unsigned long tzdram_len,
+				     unsigned long image_len)
+{
+	return -EPERM;
+}
+
+#endif
+
 #endif /* _OPTEE_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 4fd41c4..a4029a6 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -310,5 +310,6 @@ endmenu
 
 source lib/efi/Kconfig
 source lib/efi_loader/Kconfig
+source lib/optee/Kconfig
 
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 0db41c1..35da570 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_FIT) += libfdt/
 obj-$(CONFIG_OF_LIVE) += of_live.o
 obj-$(CONFIG_CMD_DHRYSTONE) += dhry/
 obj-$(CONFIG_ARCH_AT91) += at91/
+obj-$(CONFIG_OPTEE) += optee/
 
 obj-$(CONFIG_AES) += aes.o
 obj-y += charset.o
diff --git a/lib/optee/Kconfig b/lib/optee/Kconfig
new file mode 100644
index 0000000..ed6405f
--- /dev/null
+++ b/lib/optee/Kconfig
@@ -0,0 +1,7 @@
+config OPTEE
+	bool "Support OPTEE images"
+	help
+	  Selecting this option enables the OPTEE library code and
+          an OPTEE specific bootm command that will perform additional
+          OPTEE-specific checks before booting an OPTEE image created with
+          mkimage.
diff --git a/lib/optee/Makefile b/lib/optee/Makefile
new file mode 100644
index 0000000..03e832f
--- /dev/null
+++ b/lib/optee/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2017 Linaro
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_OPTEE) += optee.o
diff --git a/lib/optee/optee.c b/lib/optee/optee.c
new file mode 100644
index 0000000..2cc16d7
--- /dev/null
+++ b/lib/optee/optee.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 Linaro
+ * Bryan O'Donoghue <bryan.odonoghue at linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <tee/optee.h>
+
+int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
+		       unsigned long tzdram_len, unsigned long image_len)
+{
+	unsigned long tzdram_end = tzdram_start + tzdram_len;
+	uint32_t tee_file_size;
+
+	tee_file_size = hdr->init_size + hdr->paged_size +
+			sizeof(struct optee_header);
+
+	if (hdr->magic != OPTEE_MAGIC ||
+	    hdr->version != OPTEE_VERSION ||
+	    hdr->init_load_addr_hi > tzdram_end ||
+	    hdr->init_load_addr_lo < tzdram_start ||
+	    tee_file_size > tzdram_len ||
+	    tee_file_size != image_len ||
+	    (hdr->init_load_addr_lo + tee_file_size) > tzdram_end) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
-- 
2.7.4