diff options
Diffstat (limited to 'sys/boot/common/console.c')
| -rw-r--r-- | sys/boot/common/console.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sys/boot/common/console.c b/sys/boot/common/console.c index 6c1fdab..6656eab 100644 --- a/sys/boot/common/console.c +++ b/sys/boot/common/console.c @@ -39,6 +39,7 @@ static int cons_set(struct env_var *ev, int flags, const void *value); static int cons_find(const char *name); static int cons_check(const char *string); static void cons_change(const char *string); +static int twiddle_set(struct env_var *ev, int flags, const void *value); /* * Detect possible console(s) to use. If preferred console(s) have been @@ -52,6 +53,9 @@ cons_probe(void) int active; char *prefconsole; + /* We want a callback to install the new value when this var changes. */ + env_setenv("twiddle_divisor", EV_VOLATILE, "1", twiddle_set, env_nounset); + /* Do all console probes */ for (cons = 0; consoles[cons] != NULL; cons++) { consoles[cons]->c_flags = 0; @@ -232,3 +236,28 @@ cons_change(const char *string) free(dup); } + +/* + * Change the twiddle divisor. + * + * The user can set the twiddle_divisor variable to directly control how fast + * the progress twiddle spins, useful for folks with slow serial consoles. The + * code to monitor changes to the variable and propagate them to the twiddle + * routines has to live somewhere. Twiddling is console-related so it's here. + */ +static int +twiddle_set(struct env_var *ev, int flags, const void *value) +{ + u_long tdiv; + char * eptr; + + tdiv = strtoul(value, &eptr, 0); + if (*(const char *)value == 0 || *eptr != 0) { + printf("invalid twiddle_divisor '%s'\n", (const char *)value); + return (CMD_ERROR); + } + twiddle_divisor((u_int)tdiv); + env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); + + return(CMD_OK); +} |
