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-rw-r--r--stand/common/console.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/stand/common/console.c b/stand/common/console.c
new file mode 100644
index 0000000..f4ffc56
--- /dev/null
+++ b/stand/common/console.c
@@ -0,0 +1,302 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <string.h>
+
+#include "bootstrap.h"
+/*
+ * Core console support
+ */
+
+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 int 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
+ * specified, mark them as active. Else, mark the first probed console
+ * as active. Also create the console variable.
+ */
+void
+cons_probe(void)
+{
+ int cons;
+ 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;
+ consoles[cons]->c_probe(consoles[cons]);
+ }
+ /* Now find the first working one */
+ active = -1;
+ for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
+ consoles[cons]->c_flags = 0;
+ consoles[cons]->c_probe(consoles[cons]);
+ if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
+ active = cons;
+ }
+ /* Force a console even if all probes failed */
+ if (active == -1)
+ active = 0;
+
+ /* Check to see if a console preference has already been registered */
+ prefconsole = getenv("console");
+ if (prefconsole != NULL)
+ prefconsole = strdup(prefconsole);
+ if (prefconsole != NULL) {
+ unsetenv("console"); /* we want to replace this */
+ cons_change(prefconsole);
+ } else {
+ consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
+ consoles[active]->c_init(0);
+ prefconsole = strdup(consoles[active]->c_name);
+ }
+
+ printf("Consoles: ");
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ if (consoles[cons]->c_flags & (C_ACTIVEIN | C_ACTIVEOUT))
+ printf("%s ", consoles[cons]->c_desc);
+ printf("\n");
+
+ if (prefconsole != NULL) {
+ env_setenv("console", EV_VOLATILE, prefconsole, cons_set,
+ env_nounset);
+ free(prefconsole);
+ }
+}
+
+int
+getchar(void)
+{
+ int cons;
+ int rv;
+
+ /* Loop forever polling all active consoles */
+ for(;;)
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ if ((consoles[cons]->c_flags & (C_PRESENTIN | C_ACTIVEIN)) ==
+ (C_PRESENTIN | C_ACTIVEIN) &&
+ ((rv = consoles[cons]->c_in()) != -1))
+ return(rv);
+}
+
+int
+ischar(void)
+{
+ int cons;
+
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ if ((consoles[cons]->c_flags & (C_PRESENTIN | C_ACTIVEIN)) ==
+ (C_PRESENTIN | C_ACTIVEIN) &&
+ (consoles[cons]->c_ready() != 0))
+ return(1);
+ return(0);
+}
+
+void
+putchar(int c)
+{
+ int cons;
+
+ /* Expand newlines */
+ if (c == '\n')
+ putchar('\r');
+
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ if ((consoles[cons]->c_flags & (C_PRESENTOUT | C_ACTIVEOUT)) ==
+ (C_PRESENTOUT | C_ACTIVEOUT))
+ consoles[cons]->c_out(c);
+}
+
+/*
+ * Find the console with the specified name.
+ */
+static int
+cons_find(const char *name)
+{
+ int cons;
+
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ if (!strcmp(consoles[cons]->c_name, name))
+ return (cons);
+ return (-1);
+}
+
+/*
+ * Select one or more consoles.
+ */
+static int
+cons_set(struct env_var *ev, int flags, const void *value)
+{
+ int ret;
+
+ if ((value == NULL) || (cons_check(value) == 0)) {
+ /*
+ * Return CMD_OK instead of CMD_ERROR to prevent forth syntax error,
+ * which would prevent it processing any further loader.conf entries.
+ */
+ return (CMD_OK);
+ }
+
+ ret = cons_change(value);
+ if (ret != CMD_OK)
+ return (ret);
+
+ env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
+ return (CMD_OK);
+}
+
+/*
+ * Check that at least one the consoles listed in *string is valid
+ */
+static int
+cons_check(const char *string)
+{
+ int cons, found, failed;
+ char *curpos, *dup, *next;
+
+ dup = next = strdup(string);
+ found = failed = 0;
+ while (next != NULL) {
+ curpos = strsep(&next, " ,");
+ if (*curpos != '\0') {
+ cons = cons_find(curpos);
+ if (cons == -1) {
+ printf("console %s is invalid!\n", curpos);
+ failed++;
+ } else {
+ found++;
+ }
+ }
+ }
+
+ free(dup);
+
+ if (found == 0)
+ printf("no valid consoles!\n");
+
+ if (found == 0 || failed != 0) {
+ printf("Available consoles:\n");
+ for (cons = 0; consoles[cons] != NULL; cons++)
+ printf(" %s\n", consoles[cons]->c_name);
+ }
+
+ return (found);
+}
+
+/*
+ * Activate all the valid consoles listed in *string and disable all others.
+ */
+static int
+cons_change(const char *string)
+{
+ int cons, active;
+ char *curpos, *dup, *next;
+
+ /* Disable all consoles */
+ for (cons = 0; consoles[cons] != NULL; cons++) {
+ consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT);
+ }
+
+ /* Enable selected consoles */
+ dup = next = strdup(string);
+ active = 0;
+ while (next != NULL) {
+ curpos = strsep(&next, " ,");
+ if (*curpos == '\0')
+ continue;
+ cons = cons_find(curpos);
+ if (cons >= 0) {
+ consoles[cons]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
+ consoles[cons]->c_init(0);
+ if ((consoles[cons]->c_flags & (C_PRESENTIN | C_PRESENTOUT)) ==
+ (C_PRESENTIN | C_PRESENTOUT)) {
+ active++;
+ continue;
+ }
+
+ if (active != 0) {
+ /* If no consoles have initialised we wouldn't see this. */
+ printf("console %s failed to initialize\n", consoles[cons]->c_name);
+ }
+ }
+ }
+
+ free(dup);
+
+ if (active == 0) {
+ /* All requested consoles failed to initialise, try to recover. */
+ for (cons = 0; consoles[cons] != NULL; cons++) {
+ consoles[cons]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
+ consoles[cons]->c_init(0);
+ if ((consoles[cons]->c_flags &
+ (C_PRESENTIN | C_PRESENTOUT)) ==
+ (C_PRESENTIN | C_PRESENTOUT))
+ active++;
+ }
+
+ if (active == 0)
+ return (CMD_ERROR); /* Recovery failed. */
+ }
+
+ return (CMD_OK);
+}
+
+/*
+ * 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);
+}
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