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authorJoe Hershberger <joe.hershberger@ni.com>2012-12-11 22:16:25 -0600
committerTom Rini <trini@ti.com>2012-12-13 11:46:55 -0700
commit5e2b3e0c59df3313254941b453ffeadba9e673ae (patch)
treebbf40d293ad61cbc1644f53b4425a303cce16c4a
parent170ab11075d3be56e89d6444abf1148329130f4b (diff)
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env: Add a command to view callbacks
The callbacks can be bound, but are otherwise invisible. Add a command to show what callbacks are available. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> !!! fix callback command
-rw-r--r--README1
-rw-r--r--common/cmd_nvedit.c81
2 files changed, 82 insertions, 0 deletions
diff --git a/README b/README
index e00a7c2..ac61a32 100644
--- a/README
+++ b/README
@@ -815,6 +815,7 @@ The following options need to be configured:
CONFIG_CMD_EDITENV edit env variable
CONFIG_CMD_EEPROM * EEPROM read/write support
CONFIG_CMD_ELF * bootelf, bootvx
+ CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
CONFIG_CMD_EXPORTENV * export the environment
CONFIG_CMD_EXT2 * ext2 command support
CONFIG_CMD_EXT4 * ext4 command support
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 022ad39..1e51b9d 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -514,6 +514,81 @@ int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
}
#endif
+#if defined(CONFIG_CMD_ENV_CALLBACK)
+static int print_static_binding(const char *var_name, const char *callback_name)
+{
+ printf("\t%-20s %-20s\n", var_name, callback_name);
+
+ return 0;
+}
+
+static int print_active_callback(ENTRY *entry)
+{
+ struct env_clbk_tbl *clbkp;
+ int i;
+ int num_callbacks;
+
+ if (entry->callback == NULL)
+ return 0;
+
+ /* look up the callback in the linker-list */
+ num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
+ for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
+ i < num_callbacks;
+ i++, clbkp++) {
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+ if (entry->callback == clbkp->callback + gd->reloc_off)
+#else
+ if (entry->callback == clbkp->callback)
+#endif
+ break;
+ }
+
+ if (i == num_callbacks)
+ /* this should probably never happen, but just in case... */
+ printf("\t%-20s %p\n", entry->key, entry->callback);
+ else
+ printf("\t%-20s %-20s\n", entry->key, clbkp->name);
+
+ return 0;
+}
+
+/*
+ * Print the callbacks available and what they are bound to
+ */
+int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ struct env_clbk_tbl *clbkp;
+ int i;
+ int num_callbacks;
+
+ /* Print the available callbacks */
+ puts("Available callbacks:\n");
+ puts("\tCallback Name\n");
+ puts("\t-------------\n");
+ num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
+ for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
+ i < num_callbacks;
+ i++, clbkp++)
+ printf("\t%s\n", clbkp->name);
+ puts("\n");
+
+ /* Print the static bindings that may exist */
+ puts("Static callback bindings:\n");
+ printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
+ printf("\t%-20s %-20s\n", "-------------", "-------------");
+ env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding);
+ puts("\n");
+
+ /* walk through each variable and print the callback if it has one */
+ puts("Active callback bindings:\n");
+ printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
+ printf("\t%-20s %-20s\n", "-------------", "-------------");
+ hwalk_r(&env_htab, print_active_callback);
+ return 0;
+}
+#endif
+
/*
* Interactively edit an environment variable
*/
@@ -981,6 +1056,9 @@ static cmd_tbl_t cmd_env_sub[] = {
#if defined(CONFIG_CMD_EDITENV)
U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
#endif
+#if defined(CONFIG_CMD_ENV_CALLBACK)
+ U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
+#endif
#if defined(CONFIG_CMD_EXPORTENV)
U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
#endif
@@ -1031,6 +1109,9 @@ static char env_help_text[] =
#if defined(CONFIG_CMD_ASKENV)
"ask name [message] [size] - ask for environment variable\nenv "
#endif
+#if defined(CONFIG_CMD_ENV_CALLBACK)
+ "callbacks - print callbacks and their associated variables\nenv "
+#endif
"default [-f] -a - [forcibly] reset default environment\n"
"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
#if defined(CONFIG_CMD_EDITENV)