bootstd: Add a bootmeth command

Add a 'bootmeth' command to handle listing and ordering of boot methods.

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

cmd/Kconfig

@@ -239,6 +239,17 @@ config CMD_BOOTFLOW_FULL
 
 	  This command is not necessary for bootstd to work.
 
+config CMD_BOOTMETH
+	bool "bootmeth"
+	depends on BOOTSTD
+	default y if BOOTSTD_FULL
+	help
+	  Support listing available bootmethds (methods used to boot an
+	  Operating System), as well as selecting the order that the bootmeths
+	  are used.
+
+	  This command is not necessary for bootstd to work.
+
 config BOOTM_EFI
 	bool "Support booting UEFI FIT images"
 	depends on CMD_BOOTEFI && CMD_BOOTM && FIT

cmd/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_CMD_ARMFLASH) += armflash.o
 obj-$(CONFIG_HAVE_BLOCK_DEVICE) += blk_common.o
 obj-$(CONFIG_CMD_BOOTDEV) += bootdev.o
 obj-$(CONFIG_CMD_BOOTFLOW) += bootflow.o
+obj-$(CONFIG_CMD_BOOTMETH) += bootmeth.o
 obj-$(CONFIG_CMD_SOURCE) += source.o
 obj-$(CONFIG_CMD_BCB) += bcb.o
 obj-$(CONFIG_CMD_BDI) += bdinfo.o

cmd/bootmeth.c

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 'bootmeth' command
+ *
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <bootdev.h>
+#include <bootmeth.h>
+#include <bootstd.h>
+#include <command.h>
+#include <dm.h>
+#include <malloc.h>
+#include <dm/uclass-internal.h>
+
+static int do_bootmeth_list(struct cmd_tbl *cmdtp, int flag, int argc,
+			    char *const argv[])
+{
+	struct bootstd_priv *std;
+	struct udevice *dev;
+	bool use_order;
+	bool all = false;
+	int ret;
+	int i;
+
+	if (argc > 1 && *argv[1] == '-') {
+		all = strchr(argv[1], 'a');
+		argc--;
+		argv++;
+	}
+
+	ret = bootstd_get_priv(&std);
+	if (ret) {
+		printf("Cannot get bootstd (err=%d)\n", ret);
+		return CMD_RET_FAILURE;
+	}
+
+	printf("Order  Seq  Name                Description\n");
+	printf("-----  ---  ------------------  ------------------\n");
+
+	/*
+	 * Use the ordering if we have one, so long as we are not trying to list
+	 * all bootmethds
+	 */
+	use_order = std->bootmeth_count && !all;
+	if (use_order)
+		dev = std->bootmeth_order[0];
+	else
+		ret = uclass_find_first_device(UCLASS_BOOTMETH, &dev);
+
+	for (i = 0; dev;) {
+		struct bootmeth_uc_plat *ucp = dev_get_uclass_plat(dev);
+		int order = i;
+
+		/*
+		 * With the -a flag we may list bootdevs that are not in the
+		 * ordering. Find their place in the order
+		 */
+		if (all && std->bootmeth_count) {
+			int j;
+
+			/* Find the position of this bootmeth in the order */
+			order = -1;
+			for (j = 0; j < std->bootmeth_count; j++) {
+				if (std->bootmeth_order[j] == dev)
+					order = j;
+			}
+		}
+
+		if (order == -1)
+			printf("%5s", "-");
+		else
+			printf("%5x", order);
+		printf("  %3x  %-19.19s %s\n", dev_seq(dev), dev->name,
+		       ucp->desc);
+		i++;
+		if (use_order)
+			dev = std->bootmeth_order[i];
+		else
+			uclass_find_next_device(&dev);
+	}
+	printf("-----  ---  ------------------  ------------------\n");
+	printf("(%d bootmeth%s)\n", i, i != 1 ? "s" : "");
+
+	return 0;
+}
+
+static int do_bootmeth_order(struct cmd_tbl *cmdtp, int flag, int argc,
+			     char *const argv[])
+{
+	int ret;
+
+	ret = bootmeth_set_order(argv[1]);
+	if (ret) {
+		printf("Failed (err=%d)\n", ret);
+		return CMD_RET_FAILURE;
+	}
+	env_set("bootmeths", argv[1]);
+
+	return 0;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char bootmeth_help_text[] =
+	"list [-a]     - list available bootmeths (-a all)\n"
+	"bootmeth order [<bd> ...]  - select bootmeth order / subset to use";
+#endif
+
+U_BOOT_CMD_WITH_SUBCMDS(bootmeth, "Boot methods", bootmeth_help_text,
+	U_BOOT_SUBCMD_MKENT(list, 2, 1, do_bootmeth_list),
+	U_BOOT_SUBCMD_MKENT(order, CONFIG_SYS_MAXARGS, 1, do_bootmeth_order));