bloblist: Use explicit numbering for the tags

At present if someone adds a tag in the middle of the list it works well
enough within a U-Boot build. But if these tags are used in another
project, or with an older version of SPL, the numbers make become
inconsistent.

Use explicit tag numbers that never change, to resolve this problem.
Allocate areas for existing U-Boot tags and set up an area for use by
projects and vendors, as well as for private use. Keep tags above
0x10000 unallocated for now.

Update bloblist_tag_name() and the tests to work with this new setup.

Signed-off-by: Simon Glass <sjg@chromium.org>

3 files changed, 83 insertions, 32 deletions

diff --git a/common/bloblist.c b/common/bloblist.c
index 784eff61de..baf1d371b7 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -29,24 +29,39 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static const char *const tag_name[] = {
-	[BLOBLISTT_NONE]		= "(none)",
-	[BLOBLISTT_U_BOOT_SPL_HANDOFF]	= "SPL hand-off",
-	[BLOBLISTT_VBOOT_CTX]		= "Chrome OS vboot context",
-	[BLOBLISTT_ACPI_GNVS]		= "ACPI GNVS",
-	[BLOBLISTT_INTEL_VBT]		= "Intel Video-BIOS table",
-	[BLOBLISTT_TPM2_TCG_LOG]	= "TPM v2 log space",
-	[BLOBLISTT_TCPA_LOG]		= "TPM log space",
-	[BLOBLISTT_ACPI_TABLES]		= "ACPI tables for x86",
-	[BLOBLISTT_SMBIOS_TABLES]	= "SMBIOS tables for x86",
+static struct tag_name {
+	enum bloblist_tag_t tag;
+	const char *name;
+} tag_name[] = {
+	{ BLOBLISTT_NONE, "(none)" },
+
+	/* BLOBLISTT_AREA_FIRMWARE_TOP */
+
+	/* BLOBLISTT_AREA_FIRMWARE */
+	{ BLOBLISTT_ACPI_GNVS, "ACPI GNVS" },
+	{ BLOBLISTT_INTEL_VBT, "Intel Video-BIOS table" },
+	{ BLOBLISTT_TPM2_TCG_LOG, "TPM v2 log space" },
+	{ BLOBLISTT_TCPA_LOG, "TPM log space" },
+	{ BLOBLISTT_ACPI_TABLES, "ACPI tables for x86" },
+	{ BLOBLISTT_SMBIOS_TABLES, "SMBIOS tables for x86" },
+	{ BLOBLISTT_VBOOT_CTX, "Chrome OS vboot context" },
+
+	/* BLOBLISTT_PROJECT_AREA */
+	{ BLOBLISTT_U_BOOT_SPL_HANDOFF, "SPL hand-off" },
+
+	/* BLOBLISTT_VENDOR_AREA */
 };
 
 const char *bloblist_tag_name(enum bloblist_tag_t tag)
 {
-	if (tag < 0 || tag >= BLOBLISTT_COUNT)
-		return "invalid";
+	int i;
 
-	return tag_name[tag];
+	for (i = 0; i < ARRAY_SIZE(tag_name); i++) {
+		if (tag_name[i].tag == tag)
+			return tag_name[i].name;
+	}
+
+	return "invalid";
 }
 
 static struct bloblist_rec *bloblist_first_blob(struct bloblist_hdr *hdr)
@@ -381,10 +396,10 @@ void bloblist_show_list(void)
 	struct bloblist_hdr *hdr = gd->bloblist;
 	struct bloblist_rec *rec;
 
-	printf("%-8s  %8s  Tag Name\n", "Address", "Size");
+	printf("%-8s  %8s   Tag Name\n", "Address", "Size");
 	for (rec = bloblist_first_blob(hdr); rec;
 	     rec = bloblist_next_blob(hdr, rec)) {
-		printf("%08lx  %8x  %3d %s\n",
+		printf("%08lx  %8x  %4x %s\n",
 		       (ulong)map_to_sysmem((void *)rec + rec->hdr_size),
 		       rec->size, rec->tag, bloblist_tag_name(rec->tag));
 	}
diff --git a/include/bloblist.h b/include/bloblist.h
index fac25907c0..5de4545160 100644
--- a/include/bloblist.h
+++ b/include/bloblist.h
@@ -25,21 +25,57 @@ enum {
 enum bloblist_tag_t {
 	BLOBLISTT_NONE = 0,
 
-	/* Vendor-specific tags are permitted here */
-	BLOBLISTT_U_BOOT_SPL_HANDOFF,		/* Hand-off info from SPL */
-	BLOBLISTT_VBOOT_CTX,		/* Chromium OS verified boot context */
+	/*
+	 * Standard area to allocate blobs used across firmware components, for
+	 * things that are very commonly used, particularly in multiple
+	 * projects.
+	 */
+	BLOBLISTT_AREA_FIRMWARE_TOP = 0x1,
+
+	/* Standard area to allocate blobs used across firmware components */
+	BLOBLISTT_AREA_FIRMWARE = 0x100,
 	/*
 	 * Advanced Configuration and Power Interface Global Non-Volatile
 	 * Sleeping table. This forms part of the ACPI tables passed to Linux.
 	 */
-	BLOBLISTT_ACPI_GNVS,
-	BLOBLISTT_INTEL_VBT,		/* Intel Video-BIOS table */
-	BLOBLISTT_TPM2_TCG_LOG,		/* TPM v2 log space */
-	BLOBLISTT_TCPA_LOG,		/* TPM log space */
-	BLOBLISTT_ACPI_TABLES,		/* ACPI tables for x86 */
-	BLOBLISTT_SMBIOS_TABLES,	/* SMBIOS tables for x86 */
-
-	BLOBLISTT_COUNT
+	BLOBLISTT_ACPI_GNVS = 0x100,
+	BLOBLISTT_INTEL_VBT = 0x101,	/* Intel Video-BIOS table */
+	BLOBLISTT_TPM2_TCG_LOG = 0x102,	/* TPM v2 log space */
+	BLOBLISTT_TCPA_LOG = 0x103,	/* TPM log space */
+	BLOBLISTT_ACPI_TABLES = 0x104,	/* ACPI tables for x86 */
+	BLOBLISTT_SMBIOS_TABLES = 0x105, /* SMBIOS tables for x86 */
+	BLOBLISTT_VBOOT_CTX = 0x106,	/* Chromium OS verified boot context */
+
+	/*
+	 * Project-specific tags are permitted here. Projects can be open source
+	 * or not, but the format of the data must be fuily documented in an
+	 * open source project, including all fields, bits, etc. Naming should
+	 * be: BLOBLISTT_<project>_<purpose_here>
+	 */
+	BLOBLISTT_PROJECT_AREA = 0x8000,
+	BLOBLISTT_U_BOOT_SPL_HANDOFF = 0x8000, /* Hand-off info from SPL */
+
+	/*
+	 * Vendor-specific tags are permitted here. Projects can be open source
+	 * or not, but the format of the data must be fuily documented in an
+	 * open source project, including all fields, bits, etc. Naming should
+	 * be BLOBLISTT_<vendor>_<purpose_here>
+	 */
+	BLOBLISTT_VENDOR_AREA = 0xc000,
+
+	/* Tags after this are not allocated for now */
+	BLOBLISTT_EXPANSION = 0x10000,
+
+	/*
+	 * Tags from here are on reserved for private use within a single
+	 * firmware binary (i.e. a single executable or phase of a project).
+	 * These tags can be passed between binaries within a local
+	 * implementation, but cannot be used in upstream code. Allocate a
+	 * tag in one of the areas above if you want that.
+	 *
+	 * This area may move in future.
+	 */
+	BLOBLISTT_PRIVATE_AREA = 0xffff0000,
 };
 
 /**
diff --git a/test/bloblist.c b/test/bloblist.c
index 2e8e23d77d..c5788d5cd8 100644
--- a/test/bloblist.c
+++ b/test/bloblist.c
@@ -19,9 +19,9 @@ DECLARE_GLOBAL_DATA_PTR;
 		UNIT_TEST(_name, _flags, bloblist_test)
 
 enum {
-	TEST_TAG		= 1,
-	TEST_TAG2		= 2,
-	TEST_TAG_MISSING	= 3,
+	TEST_TAG		= BLOBLISTT_U_BOOT_SPL_HANDOFF,
+	TEST_TAG2		= BLOBLISTT_VBOOT_CTX,
+	TEST_TAG_MISSING	= 0x10000,
 
 	TEST_SIZE		= 10,
 	TEST_SIZE2		= 20,
@@ -288,10 +288,10 @@ static int bloblist_test_cmd_list(struct unit_test_state *uts)
 	ut_silence_console(uts);
 	console_record_reset();
 	run_command("bloblist list", 0);
-	ut_assert_nextline("Address       Size  Tag Name");
-	ut_assert_nextline("%08lx  %8x    1 SPL hand-off",
+	ut_assert_nextline("Address       Size   Tag Name");
+	ut_assert_nextline("%08lx  %8x  8000 SPL hand-off",
 			   (ulong)map_to_sysmem(data), TEST_SIZE);
-	ut_assert_nextline("%08lx  %8x    2 Chrome OS vboot context",
+	ut_assert_nextline("%08lx  %8x   106 Chrome OS vboot context",
 			   (ulong)map_to_sysmem(data2), TEST_SIZE2);
 	ut_assert_console_end();
 	ut_unsilence_console(uts);