bloblist: Add a command

It is helpful to be able to see basic statistics about the bloblist and
also to list its contents. Add a 'bloblist' command to handle this.

Put the display functions in the bloblist modules rather than in the
command code itself. That allows showing a list from SPL, where commands
are not available.

Also make bloblist_first/next_blob() static as they are not used outside
this file.

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

3 files changed, 47 insertions, 0 deletions

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 999b6cf239a..b25d2b02ed5 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -631,6 +631,15 @@ config CMD_BINOP
 	  Compute binary operations (xor, or, and) of byte arrays of arbitrary
 	  size from memory and store the result in memory or the environment.
 
+config CMD_BLOBLIST
+	bool "bloblist"
+	default y if BLOBLIST
+	help
+	  Show information about the bloblist, a collection of binary blobs
+	  held in memory that persist between SPL and U-Boot. In the case of
+	  x86 devices the bloblist can be used to hold ACPI tables so that they
+	  remain available in memory.
+
 config CMD_CRC32
 	bool "crc32"
 	default y
diff --git a/cmd/Makefile b/cmd/Makefile
index c7a08ed1094..015b83764c6 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_CMD_BDI) += bdinfo.o
 obj-$(CONFIG_CMD_BEDBUG) += bedbug.o
 obj-$(CONFIG_CMD_BIND) += bind.o
 obj-$(CONFIG_CMD_BINOP) += binop.o
+obj-$(CONFIG_CMD_BLOBLIST) += bloblist.o
 obj-$(CONFIG_CMD_BLOCK_CACHE) += blkcache.o
 obj-$(CONFIG_CMD_BMP) += bmp.o
 obj-$(CONFIG_CMD_BOOTCOUNT) += bootcount.o
diff --git a/cmd/bloblist.c b/cmd/bloblist.c
new file mode 100644
index 00000000000..bb2e682ff84
--- /dev/null
+++ b/cmd/bloblist.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Command-line access to bloblist features
+ *
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <bloblist.h>
+#include <command.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int do_bloblist_info(struct cmd_tbl *cmdtp, int flag, int argc,
+			    char *const argv[])
+{
+	bloblist_show_stats();
+
+	return 0;
+}
+
+static int do_bloblist_list(struct cmd_tbl *cmdtp, int flag, int argc,
+			    char *const argv[])
+{
+	bloblist_show_list();
+
+	return 0;
+}
+
+static char bloblist_help_text[] =
+	"info   - show information about the bloblist\n"
+	"bloblist list   - list blobs in the bloblist";
+
+U_BOOT_CMD_WITH_SUBCMDS(bloblist, "Bloblists", bloblist_help_text,
+	U_BOOT_SUBCMD_MKENT(info, 1, 1, do_bloblist_info),
+	U_BOOT_SUBCMD_MKENT(list, 1, 1, do_bloblist_list));