cbtable: describe boot media

This allows finding the currently used CBFS (in case there are several), and
avoids the need to define flash size when building the payload.

Change-Id: I4b00159610077761c501507e136407e9ae08c73e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10867
Tested-by: build bot (Jenkins)

2 files changed, 45 insertions, 0 deletions

diff --git a/src/include/boot/coreboot_tables.h b/src/include/boot/coreboot_tables.h
index c8d52517f9..3dddde5bbf 100644
--- a/src/include/boot/coreboot_tables.h
+++ b/src/include/boot/coreboot_tables.h
@@ -297,6 +297,17 @@ struct lb_spi_flash {
 	uint32_t erase_cmd;
 };
 
+#define LB_TAG_BOOT_MEDIA_PARAMS 0x0030
+struct lb_boot_media_params {
+	uint32_t tag;
+	uint32_t size;
+	/* offsets are relative to start of boot media */
+	uint64_t fmap_offset;
+	uint64_t cbfs_offset;
+	uint64_t cbfs_size;
+	uint64_t boot_media_size;
+};
+
 #define LB_TAG_SERIALNO		0x002a
 #define MAX_SERIALNO_LENGTH	32
 
diff --git a/src/lib/coreboot_table.c b/src/lib/coreboot_table.c
index f7fb2bb54a..6859bf2d91 100644
--- a/src/lib/coreboot_table.c
+++ b/src/lib/coreboot_table.c
@@ -23,10 +23,12 @@
 #include <console/uart.h>
 #include <ip_checksum.h>
 #include <boot/coreboot_tables.h>
+#include <boot_device.h>
 #include <string.h>
 #include <version.h>
 #include <boardid.h>
 #include <device/device.h>
+#include <fmap.h>
 #include <stdlib.h>
 #include <cbfs.h>
 #include <cbmem.h>
@@ -228,6 +230,36 @@ static void lb_board_id(struct lb_header *header)
 #endif
 }
 
+static void lb_boot_media_params(struct lb_header *header)
+{
+	struct lb_boot_media_params *bmp;
+	struct cbfs_props props;
+	const struct region_device *boot_dev;
+	struct region_device fmrd;
+
+	boot_device_init();
+
+	if (cbfs_boot_region_properties(&props))
+		return;
+
+	boot_dev = boot_device_ro();
+	if (boot_dev == NULL)
+		return;
+
+	bmp = (struct lb_boot_media_params *)lb_new_record(header);
+	bmp->tag = LB_TAG_BOOT_MEDIA_PARAMS;
+	bmp->size = sizeof(*bmp);
+
+	bmp->cbfs_offset = props.offset;
+	bmp->cbfs_size = props.size;
+	bmp->boot_media_size = region_device_sz(boot_dev);
+
+	bmp->fmap_offset = ~(uint64_t)0;
+	if (find_fmap_directory(&fmrd) == 0) {
+		bmp->fmap_offset = region_device_offset(&fmrd);
+	}
+}
+
 static void lb_ram_code(struct lb_header *header)
 {
 #if IS_ENABLED(CONFIG_RAM_CODE_SUPPORT)
@@ -483,6 +515,8 @@ unsigned long write_coreboot_table(
 	lb_ramoops(head);
 #endif
 
+	lb_boot_media_params(head);
+
 	/* Remember where my valid memory ranges are */
 	return lb_table_fini(head);
 }