[PATCH v3 1/6] bloblist: add blob type for DT overlay

[Raymond Mao]

Add blob type for DT overlay according to the update of Firmware
Handoff spec[1].
Add an inline header to represent the 'subtype' in a DT overlay
blob payload.

[1] Add Transfer Entry for Devicetree Overlay
https://github.com/FirmwareHandoff/firmware_handoff/pull/74

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
Changes in v2:
- Add inline header for 'subtype'.
Changes in v3:
- None.

 common/bloblist.c  |  1 +
 include/bloblist.h | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/common/bloblist.c b/common/bloblist.c
index 6e4f020d7c4..1c690f58b56 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -43,6 +43,7 @@ static struct tag_name {
 	{ BLOBLISTT_ACPI_TABLES, "ACPI tables for x86" },
 	{ BLOBLISTT_TPM_EVLOG, "TPM event log defined by TCG EFI" },
 	{ BLOBLISTT_TPM_CRB_BASE, "TPM Command Response Buffer address" },
+	{ BLOBLISTT_FDT_OVERLAY, "DT overlay" },
 
 	/* BLOBLISTT_AREA_FIRMWARE */
 	{ BLOBLISTT_TPM2_TCG_LOG, "TPM v2 log space" },
diff --git a/include/bloblist.h b/include/bloblist.h
index f32faf78560..c2d3065a43c 100644
--- a/include/bloblist.h
+++ b/include/bloblist.h
@@ -110,7 +110,8 @@ enum bloblist_tag_t {
 	BLOBLISTT_ACPI_TABLES = 4,
 	BLOBLISTT_TPM_EVLOG = 5,
 	BLOBLISTT_TPM_CRB_BASE = 6,
-	BLOBLISTT_ACPI_PP = 7,
+	BLOBLISTT_FDT_OVERLAY = 7,
+	BLOBLISTT_ACPI_PP = 8,
 
 	/* Standard area to allocate blobs used across firmware components */
 	BLOBLISTT_AREA_FIRMWARE = 0x10,
@@ -231,6 +232,16 @@ enum {
 	BLOBLIST_REC_HDR_SIZE		= sizeof(struct bloblist_rec),
 };
 
+/*
+ * struct dto_blob_hdr - Blob inline header for BLOBLISTT_FDT_OVERLAY
+ *
+ * @subtype: IMP-DEF per the agreement between the DT overlay producer and
+ *	consumer. Default value is 0.
+ */
+struct dto_blob_hdr {
+	u64 subtype;
+};
+
 /**
  * bloblist_check_magic() - return a bloblist if the magic matches
  *
-- 
2.25.1