coreboot: add vboot_handoff to coreboot tables

The vboot_handoff structure contians the VbInitParams as well as the
shared vboot data. In order for the boot loader to find it, the
structure address and size needs to be obtained from the coreboot
tables.

Change-Id: I6573d479009ccbf373a7325f861bebe8dc9f5cf8
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2857
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/x86/boot/coreboot_table.c

@@ -36,6 +36,7 @@
 #endif
 #if CONFIG_CHROMEOS
 #include <arch/acpi.h>
+#include <vendorcode/google/chromeos/chromeos.h>
 #include <vendorcode/google/chromeos/gnvs.h>
 #endif
 
@@ -219,7 +220,27 @@ static void lb_vbnv(struct lb_header *header)
 	vbnv->vbnv_start = CONFIG_VBNV_OFFSET + 14;
 	vbnv->vbnv_size = CONFIG_VBNV_SIZE;
 }
-#endif
+
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+static void lb_vboot_handoff(struct lb_header *header)
+{
+	void *addr;
+	uint32_t size;
+	struct lb_vboot_handoff* vbho;
+
+	if (vboot_get_handoff_info(&addr, &size))
+		return;
+
+	vbho = (struct lb_vboot_handoff *)lb_new_record(header);
+	vbho->tag = LB_TAB_VBOOT_HANDOFF;
+	vbho->size = sizeof(*vbho);
+	vbho->vboot_handoff_addr = addr;
+	vbho->vboot_handoff_size = size;
+}
+#else
+static inline void lb_vboot_handoff(struct lb_header *header) {}
+#endif /* CONFIG_VBOOT_VERIFY_FIRMWARE */
+#endif /* CONFIG_CHROMEOS */
 
 static void add_cbmem_pointers(struct lb_header *header)
 {
@@ -697,6 +718,9 @@ unsigned long write_coreboot_table(
 
 	/* pass along VBNV offsets in CMOS */
 	lb_vbnv(head);
+
+	/* pass along the vboot_handoff address. */
+	lb_vboot_handoff(head);
 #endif
 	add_cbmem_pointers(head);
 

src/include/boot/coreboot_tables.h

@@ -241,6 +241,15 @@ struct lb_vbnv {
 	uint32_t vbnv_size;
 };
 
+#define LB_TAB_VBOOT_HANDOFF	0x0020
+struct lb_vboot_handoff {
+	uint32_t tag;
+	uint32_t size;
+
+	void *vboot_handoff_addr;
+	uint32_t vboot_handoff_size;
+};
+
 /* The following structures are for the cmos definitions table */
 #define LB_TAG_CMOS_OPTION_TABLE 200
 /* cmos header record */

src/vendorcode/google/chromeos/chromeos.c

@@ -66,4 +66,18 @@ void *vboot_get_payload(int *len)
 
 	return (void *)fwc->address;
 }
+
+int vboot_get_handoff_info(void **addr, uint32_t *size)
+{
+	struct vboot_handoff *vboot_handoff;
+
+	vboot_handoff = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vboot_handoff == NULL)
+		return -1;
+
+	*addr = vboot_handoff;
+	*size = sizeof(*vboot_handoff);
+	return 0;
+}
 #endif

src/vendorcode/google/chromeos/chromeos.h

@@ -49,6 +49,8 @@ void init_chromeos(int bootmode);
 struct romstage_handoff;
 void vboot_verify_firmware(struct romstage_handoff *handoff);
 void *vboot_get_payload(int *len);
+/* Returns 0 on success < 0 on error. */
+int vboot_get_handoff_info(void **addr, uint32_t *size);
 #endif
 
 #endif