arm64: zynqmp: Add support for verifying secure images

This patch adds new command "zynqmp" to handle zynqmp
specific commands like "zynqmp secure". This secure command is
used for verifying zynqmp specific secure images. The secure
image can either be authenticated or encrypted or both encrypted
and authenticated. The secure image is prepared using bootgen
and will be in xilinx specific BOOT.BIN format. The optional
key can be used for decryption of encrypted image if user
key was specified while creation BOOT.BIN.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

3 files changed, 127 insertions, 0 deletions

diff --git a/board/xilinx/zynqmp/Kconfig b/board/xilinx/zynqmp/Kconfig
new file mode 100644
index 0000000000..7d1f7398c3
--- /dev/null
+++ b/board/xilinx/zynqmp/Kconfig
@@ -0,0 +1,18 @@
+# Copyright (c) 2018, Xilinx, Inc.
+#
+# SPDX-License-Identifier: GPL-2.0
+
+if ARCH_ZYNQMP
+
+config CMD_ZYNQMP
+	bool "Enable ZynqMP specific commands"
+	default y
+	help
+	  Enable ZynqMP specific commands like "zynqmp secure"
+	  which is used for zynqmp secure image verification.
+	  The secure image is a xilinx specific BOOT.BIN with
+	  either authentication or encryption or both encryption
+	  and authentication feature enabled while generating
+	  BOOT.BIN using Xilinx bootgen tool.
+
+endif
diff --git a/board/xilinx/zynqmp/Makefile b/board/xilinx/zynqmp/Makefile
index 75aab92f04..3b7a10e202 100644
--- a/board/xilinx/zynqmp/Makefile
+++ b/board/xilinx/zynqmp/Makefile
@@ -26,6 +26,10 @@ ifneq ($(call ifdef_any_of, CONFIG_ZYNQMP_PSU_INIT_ENABLED CONFIG_SPL_BUILD),)
 obj-y += $(init-objs)
 endif
 
+ifndef CONFIG_SPL_BUILD
+obj-$(CONFIG_CMD_ZYNQMP) += cmds.o
+endif
+
 # Suppress "warning: function declaration isn't a prototype"
 CFLAGS_REMOVE_psu_init_gpl.o := -Wstrict-prototypes
 
diff --git a/board/xilinx/zynqmp/cmds.c b/board/xilinx/zynqmp/cmds.c
new file mode 100644
index 0000000000..6712d7b8cf
--- /dev/null
+++ b/board/xilinx/zynqmp/cmds.c
@@ -0,0 +1,105 @@
+/*
+ * (C) Copyright 2018 Xilinx, Inc.
+ * Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+
+static int zynqmp_verify_secure(u8 *key_ptr, u8 *src_ptr, u32 len)
+{
+	int ret;
+	u32 src_lo, src_hi;
+	u32 key_lo = 0;
+	u32 key_hi = 0;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	u64 addr;
+
+	if ((ulong)src_ptr != ALIGN((ulong)src_ptr,
+				    CONFIG_SYS_CACHELINE_SIZE)) {
+		printf("Failed: source address not aligned:%p\n", src_ptr);
+		return -EINVAL;
+	}
+
+	src_lo = lower_32_bits((ulong)src_ptr);
+	src_hi = upper_32_bits((ulong)src_ptr);
+	flush_dcache_range((ulong)src_ptr, (ulong)(src_ptr + len));
+
+	if (key_ptr) {
+		key_lo = lower_32_bits((ulong)key_ptr);
+		key_hi = upper_32_bits((ulong)key_ptr);
+		flush_dcache_range((ulong)key_ptr,
+				   (ulong)(key_ptr + KEY_PTR_LEN));
+	}
+
+	ret = invoke_smc(ZYNQMP_SIP_SVC_PM_SECURE_IMG_LOAD, src_lo, src_hi,
+			 key_lo, key_hi, ret_payload);
+	if (ret) {
+		printf("Failed: secure op status:0x%x\n", ret);
+	} else {
+		addr = (u64)ret_payload[1] << 32 | ret_payload[2];
+		printf("Verified image at 0x%llx\n", addr);
+		env_set_hex("zynqmp_verified_img_addr", addr);
+	}
+
+	return ret;
+}
+
+/**
+ * do_zynqmp - Handle the "zynqmp" command-line command
+ * @cmdtp:	Command data struct pointer
+ * @flag:	Command flag
+ * @argc:	Command-line argument count
+ * @argv:	Array of command-line arguments
+ *
+ * Processes the zynqmp specific commands
+ *
+ * Return: return 0 on success and CMD_RET_USAGE incase of misuse and error
+ */
+static int do_zynqmp(cmd_tbl_t *cmdtp, int flag, int argc,
+		     char *const argv[])
+{
+	u64 src_addr;
+	u32 len;
+	u8 *key_ptr = NULL;
+	u8 *src_ptr;
+	int ret;
+
+	if (argc > 5 || argc < 4 || strncmp(argv[1], "secure", 6))
+		return CMD_RET_USAGE;
+
+	src_addr = simple_strtoull(argv[2], NULL, 16);
+
+	len = simple_strtoul(argv[3], NULL, 16);
+
+	if (argc > 4)
+		key_ptr = (uint8_t *)(uintptr_t)simple_strtoull(argv[4],
+								NULL, 16);
+
+	src_ptr = (uint8_t *)(uintptr_t)src_addr;
+
+	ret = zynqmp_verify_secure(key_ptr, src_ptr, len);
+	if (ret)
+		return CMD_RET_FAILURE;
+
+	return CMD_RET_SUCCESS;
+}
+
+/***************************************************/
+#ifdef CONFIG_SYS_LONGHELP
+static char zynqmp_help_text[] =
+	"secure src len [key_addr] - verifies secure images of $len bytes\n"
+	"                            long at address $src. Optional key_addr\n"
+	"                            can be specified if user key needs to\n"
+	"                            be used for decryption\n";
+#endif
+
+U_BOOT_CMD(
+	zynqmp, 5, 1, do_zynqmp,
+	"Verify and load secure images",
+	zynqmp_help_text
+)