x86: zboot: Add an 'info' subcommand

Add a little subcommand that prints out where the kernel was loaded and
its setup pointer. Run it by default in the normal boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index aabf911..4a1a3c3 100644 (file)
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -68,9 +68,10 @@ struct zboot_state {
 
 enum {
        ZBOOT_STATE_START       = BIT(0),
-       ZBOOT_STATE_GO          = BIT(1),
+       ZBOOT_STATE_INFO        = BIT(1),
+       ZBOOT_STATE_GO          = BIT(2),
 
-       ZBOOT_STATE_COUNT       = 2,
+       ZBOOT_STATE_COUNT       = 3,
 };
 
 static void build_command_line(char *command_line, int auto_boot)
@@ -383,6 +384,15 @@ static int do_zboot_start(struct cmd_tbl *cmdtp, int flag, int argc,
        return 0;
 }
 
+static int do_zboot_info(struct cmd_tbl *cmdtp, int flag, int argc,
+                        char *const argv[])
+{
+       printf("Kernel loaded at %08lx, setup_base=%p\n",
+              state.load_address, state.base_ptr);
+
+       return 0;
+}
+
 static int do_zboot_go(struct cmd_tbl *cmdtp, int flag, int argc,
                       char *const argv[])
 {
@@ -401,6 +411,7 @@ static int do_zboot_go(struct cmd_tbl *cmdtp, int flag, int argc,
 /* Note: This defines the complete_zboot() function */
 U_BOOT_SUBCMDS(zboot,
        U_BOOT_CMD_MKENT(start, 6, 1, do_zboot_start, "", ""),
+       U_BOOT_CMD_MKENT(info, 1, 1, do_zboot_info, "", ""),
        U_BOOT_CMD_MKENT(go, 1, 1, do_zboot_go, "", ""),
 )
 
@@ -441,7 +452,7 @@ int do_zboot_parent(struct cmd_tbl *cmdtp, int flag, int argc,
        }
 
        do_zboot_states(cmdtp, flag, argc, argv, ZBOOT_STATE_START |
-                       ZBOOT_STATE_GO);
+                       ZBOOT_STATE_INFO | ZBOOT_STATE_GO);
 
        return CMD_RET_FAILURE;
 }
@@ -459,6 +470,7 @@ U_BOOT_CMDREP_COMPLETE(
        "\n"
        "Sub-commands to do part of the zboot sequence:\n"
        "\tstart [addr [arg ...]] - specify arguments\n"
+       "\tinfo   - show summary info\n"
        "\tgo     - start OS\n",
        complete_zboot
 );