arm: imx: hab: Add IVT header definitions

The various i.MX BootROMs containing the High Assurance Boot (HAB) block
rely on a data structure called the Image Vector Table (IVT) to describe to
the BootROM where to locate various data-structures used by HAB during
authentication.

This patch adds a definition of the IVT header for use in later patches,
where we will break the current incorrect dependence on fixed offsets in
favour of an IVT described parsing of incoming binaries.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Sven Ebenfeld <sven.ebenfeld@gmail.com>
Cc: George McCollister <george.mccollister@gmail.com>
Cc: Breno Matheus Lima <brenomatheus@gmail.com>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

arch/arm/include/asm/mach-imx/hab.h

@@ -10,6 +10,34 @@
 
 #include <linux/types.h>
 
+/*
+ * IVT header definitions
+ * Security Reference Manual for i.MX 7Dual and 7Solo Applications Processors,
+ * Rev. 0, 03/2017
+ * Section : 6.7.1.1
+ */
+#define IVT_HEADER_MAGIC	0xD1
+#define IVT_TOTAL_LENGTH	0x20
+#define IVT_HEADER_V1		0x40
+#define IVT_HEADER_V2		0x41
+
+struct ivt_header {
+	uint8_t		magic;
+	uint16_t	length;
+	uint8_t		version;
+} __attribute__((packed));
+
+struct ivt {
+	struct ivt_header hdr;	/* IVT header above */
+	uint32_t entry;		/* Absolute address of first instruction */
+	uint32_t reserved1;	/* Reserved should be zero */
+	uint32_t dcd;		/* Absolute address of the image DCD */
+	uint32_t boot;		/* Absolute address of the boot data */
+	uint32_t self;		/* Absolute address of the IVT */
+	uint32_t csf;		/* Absolute address of the CSF */
+	uint32_t reserved2;	/* Reserved should be zero */
+};
+
 /* -------- start of HAB API updates ------------*/
 /* The following are taken from HAB4 SIS */