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/*****************************************************************************
* Boot menu: Displays boot devices and waits for user to select one
*
* Copyright 2017 Red Hat, Inc.
*
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* Thomas Huth, Red Hat Inc. - initial implementation
*****************************************************************************/
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <paflof.h>
#include <helpers.h>
#include "bootmenu.h"
#define MAX_DEVS 36 /* Enough for 10 digits + 26 letters */
#define MAX_ALIAS_LEN 8 /* Maximum length of alias names */
struct bootdev {
char alias[MAX_ALIAS_LEN];
char *path;
};
static int nr_devs;
static struct bootdev bootdevs[MAX_DEVS];
/**
* Look up an alias name.
* @return The NUL-terminated device tree path (should be released with free()
* when it's not required anymore), or NULL if it can't be found.
*/
static char *find_alias(char *alias)
{
char *path;
long len;
forth_push((unsigned long)alias);
forth_push(strlen(alias));
forth_eval("find-alias");
len = forth_pop();
if (!len)
return NULL;
path = malloc(len + 1);
if (!path) {
puts("Out of memory in find_alias");
return NULL;
}
memcpy(path, (void *)forth_pop(), len);
path[len] = '\0';
return path;
}
static void bootmenu_populate_devs_alias(const char *alias)
{
int idx;
for (idx = 0; idx <= 9 && nr_devs < MAX_DEVS; idx++, nr_devs++) {
char *cur_alias = bootdevs[nr_devs].alias;
if (idx == 0)
strcpy(cur_alias, alias);
else
sprintf(cur_alias, "%s%i", alias, idx);
bootdevs[nr_devs].path = find_alias(cur_alias);
if (!bootdevs[nr_devs].path)
break;
}
}
static void bootmenu_populate_devs(void)
{
bootmenu_populate_devs_alias("cdrom");
bootmenu_populate_devs_alias("disk");
bootmenu_populate_devs_alias("net");
}
static void bootmenu_free_devs(void)
{
while (nr_devs-- > 0) {
free(bootdevs[nr_devs].path);
bootdevs[nr_devs].path = NULL;
}
}
static void bootmenu_show_devs(void)
{
int i;
for (i = 0; i < nr_devs; i++) {
printf("%c) %6s : %s\n", i < 9 ? '1' + i : 'a' + i - 9,
bootdevs[i].alias, bootdevs[i].path);
}
}
static bool has_key(void)
{
forth_eval("key?");
return forth_pop();
}
static char get_key(void)
{
forth_eval("key");
return forth_pop();
}
/* Flush pending key presses */
static void flush_keys(void)
{
uint32_t start;
start = SLOF_GetTimer();
while (SLOF_GetTimer() - start < 10) {
if (has_key()) {
get_key();
start = SLOF_GetTimer();
}
}
}
static int bootmenu_get_selection(void)
{
char key = 0;
int sel;
do {
sel = -1;
if (!has_key())
continue;
key = get_key();
switch (key) {
case '0':
return -1;
case '1' ... '9':
sel = key - '1';
break;
case 'a' ... 'z':
sel = key - 'a' + 9;
break;
case 'A' ... 'Z':
sel = key - 'A' + 9;
break;
default:
/* Might be another escape code (F12) ... skip it */
flush_keys();
break;
}
} while (sel < 0 || sel >= nr_devs);
return sel;
}
void bootmenu(void)
{
int sel;
bootmenu_populate_devs();
if (!nr_devs) {
puts("No available boot devices!");
return;
}
puts("\nSelect boot device (or press '0' to abort):");
bootmenu_show_devs();
if (has_key()) /* In case the user hammered on F12 */
flush_keys();
sel = bootmenu_get_selection();
if (sel < 0) {
forth_push(0);
} else {
forth_push((unsigned long)bootdevs[sel].alias);
forth_push(strlen(bootdevs[sel].alias));
}
bootmenu_free_devs();
}
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