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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
utp
Joe Hershberger 2012-12-11 22:16:25 -06:00 committed by Tom Rini
parent 170ab11075
commit 5e2b3e0c59
2 changed files with 82 additions and 0 deletions
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1
README
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@ -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

81
common/cmd_nvedit.c
View File

@ -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
@ -1030,6 +1108,9 @@ static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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"