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kexecboot.c
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kexecboot.c
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/*
* kexecboot - A kexec based bootloader
*
* Copyright (c) 2008-2011 Yuri Bushmelev <[email protected]>
* Copyright (c) 2008 Thomas Kunze <[email protected]>
*
* small parts:
* Copyright (c) 2006 Matthew Allum <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/*
* TODO Show debug info in special dialog
* TODO Cleanup debug info
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/input.h>
#include <unistd.h>
#include <sys/mount.h>
#include <ctype.h>
#include <errno.h>
#include <sys/reboot.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "config.h"
#include "util.h"
#include "cfgparser.h"
#include "devicescan.h"
#include "evdevs.h"
#include "menu.h"
#include "kexecboot.h"
#ifdef USE_FBMENU
#include "gui.h"
#endif
#ifdef USE_TEXTUI
#include "tui.h"
#endif
#ifdef USE_ZAURUS
#include "machine/zaurus.h"
#endif
/* Don't re-create devices when executing on host */
#ifdef USE_HOST_DEBUG
#undef USE_DEVICES_RECREATING
#endif
#ifdef USE_MACHINE_KERNEL
/* Machine-dependent kernel patch */
char *machine_kernel = NULL;
#endif
/* NULL-terminated array of kernel search paths
* First item should be filled with machine-dependent path */
char *default_kernels[] = {
#ifdef USE_ZIMAGE
"/mnt/boot/zImage",
"/mnt/zImage",
#endif
#ifdef USE_UIMAGE
"/mnt/boot/uImage",
"/mnt/uImage",
#endif
NULL
};
/* Init mode flag */
int initmode = 0;
/* Contexts available - menu and textview */
typedef enum {
KX_CTX_MENU,
KX_CTX_TEXTVIEW,
} kx_context;
/* Common parameters */
struct params_t {
struct cfgdata_t *cfg;
struct bootconf_t *bootcfg;
kx_menu *menu;
kx_context context;
#ifdef USE_FBMENU
struct gui_t *gui;
#endif
#ifdef USE_TEXTUI
kx_tui *tui;
#endif
};
static char *kxb_ttydev = NULL;
static int kxb_echo_state = 0;
static void atexit_restore_terminal(void)
{
setup_terminal(kxb_ttydev, &kxb_echo_state, 0);
}
#ifdef USE_MACHINE_KERNEL
/* Return lowercased and stripped machine-specific kernel path */
/* Return value should be free()'d */
char *get_machine_kernelpath() {
FILE *f;
char *tmp, *hw = NULL, c;
char line[80];
f = fopen("/proc/cpuinfo", "r");
if (!f) {
perror("/proc/cpuinfo");
exit(-1);
}
/* Search string 'Hardware' */
while (fgets(line, sizeof(line), f)) {
line[strlen(line) - 1] = '\0';
hw = strstr(line, "Hardware");
if (NULL != hw) break;
}
fclose(f);
if ( NULL != hw) {
/* Search colon then skip it and space after */
hw = strchr(hw, ':');
if (NULL == hw) { /* Should not happens but anyway */
log_msg(lg, "Can't find ':' in 'Hardware' line");
return NULL;
}
hw += 2; /* May be ltrim()? */
/* Lowercase name and replace spaces with '_' */
tmp = hw;
while('\0' != *tmp) {
c = *tmp;
if (isspace(c)) {
*tmp = '_';
} else {
*tmp = tolower(c);
}
++tmp;
}
/* Prepend "/mnt/boot/zImage-" to hw */
tmp = malloc(strlen(hw) + 17 + 1); /* strlen("/mnt/boot/zImage-") */
if (NULL == tmp) {
DPRINTF("Can't allocate memory for machine-specific kernel path");
return NULL;
}
strcpy(tmp, "/mnt/boot/zImage-");
strcat(tmp, hw);
return tmp;
}
log_msg(lg, "Can't find 'Hardware' line in cpuinfo");
return NULL;
}
#endif /* USE_MACHINE_KERNEL */
void start_kernel(struct params_t *params, int choice)
{
/* we use var[] instead of *var because sizeof(var) using */
#ifdef USE_HOST_DEBUG
const char kexec_path[] = "/bin/echo";
#else
const char kexec_path[] = KEXEC_PATH;
#endif
const char mount_point[] = MOUNTPOINT;
const char str_cmdline_start[] = "--command-line=";
const char str_rootfstype[] = " rootfstype=";
const char str_rootwait[] = " rootwait";
const char str_ubirootdev[] = "ubi0";
const char str_ubimtd[] = " ubi.mtd="; /* max ' ubi.mtd=15' len 11 +1 = 12 */
#ifdef UBI_VID_HDR_OFFSET
const char str_ubimtd_off[] = UBI_VID_HDR_OFFSET;
#else
const char str_ubimtd_off[] = "";
#endif
char mount_dev[16];
char mount_fstype[16];
char str_mtd_id[3];
/* Tags passed from host kernel cmdline to kexec'ed kernel */
const char str_mtdparts[] = " mtdparts=";
const char str_fbcon[] = " fbcon=";
const char str_initrd_start[] = "--initrd=";
/* empty environment */
char *const envp[] = { NULL };
const char *load_argv[] = { NULL, "-l", "--mem-max=0x40FFFFFF", NULL, NULL, NULL, NULL };
const char *exec_argv[] = { NULL, "-e", NULL, NULL};
char *cmdline_arg = NULL, *initrd_arg = NULL;
int n, idx, u;
struct stat sinfo;
struct boot_item_t *item;
item = params->bootcfg->list[choice];
exec_argv[0] = kexec_path;
load_argv[0] = kexec_path;
/* --command-line arg generation */
idx = 3; /* load_argv current option index */
/* fill '--command-line' option */
if (item->device) {
/* allocate space */
n = sizeof(str_cmdline_start) +
sizeof(str_ubirootdev) + 2 + strlen(item->device) +
sizeof(str_ubimtd) + 2 + sizeof(str_ubimtd_off) + 1 +
sizeof(str_rootwait) +
sizeof(str_rootfstype) + strlen(item->fstype) + 2 +
sizeof(str_mtdparts) + strlenn(params->cfg->mtdparts) +
sizeof(str_fbcon) + strlenn(params->cfg->fbcon) +
sizeof(char) + strlenn(item->cmdline);
cmdline_arg = (char *)malloc(n);
if (NULL == cmdline_arg) {
perror("Can't allocate memory for cmdline_arg");
} else {
strcpy(cmdline_arg, str_cmdline_start); /* --command-line= */
if (item->fstype) {
strcpy(mount_dev, item->device);
/* default fstype to mount */
strcpy(mount_fstype, item->fstype);
/* extra tags when we detect UBI */
if (!strncmp(item->fstype,"ubi",3)) {
/* mtd id [0-15] - one or two digits */
if(isdigit(atoi(item->device+strlen(item->device)-2))) {
strcpy(str_mtd_id, item->device+strlen(item->device)-2);
(str_mtd_id, item->device+strlen(item->device)-1);
} else {
strcpy(str_mtd_id, item->device+strlen(item->device)-1);
}
/* get corresponding ubi dev to mount */
u = find_attached_ubi_device(str_mtd_id);
sprintf(mount_dev, "/dev/ubi%d", u);
/* FIXME: first volume is hardcoded */
strcat(mount_dev, "_0");
/* HARDCODED: we assume it's ubifs */
strcpy(mount_fstype,"ubifs");
/* extra cmdline tags when we detect ubi */
strcat(cmdline_arg, str_ubirootdev);
/* FIXME: first volume is hardcoded */
strcat(cmdline_arg, "_0");
strcat(cmdline_arg, str_ubimtd);
strcat(cmdline_arg, str_mtd_id);
#ifdef UBI_VID_HDR_OFFSET
strcat(cmdline_arg, ",");
strcat(cmdline_arg, str_ubimtd_off);
#endif
}
}
if (params->cfg->mtdparts) {
strcat(cmdline_arg, str_mtdparts);
strcat(cmdline_arg, params->cfg->mtdparts);
}
if (params->cfg->fbcon) {
strcat(cmdline_arg, str_fbcon);
strcat(cmdline_arg, params->cfg->fbcon);
}
if (item->cmdline)
strcat(cmdline_arg, item->cmdline);
load_argv[idx] = cmdline_arg;
++idx;
}
}
/* fill '--initrd' option */
if (item->initrd) {
/* allocate space */
n = sizeof(str_initrd_start) + strlen(item->initrd);
initrd_arg = (char *)malloc(n);
if (NULL == initrd_arg) {
perror("Can't allocate memory for initrd_arg");
} else {
strcpy(initrd_arg, str_initrd_start); /* --initrd= */
strcat(initrd_arg, item->initrd);
load_argv[idx] = initrd_arg;
++idx;
}
}
/* Append kernelpath as last arg of kexec */
load_argv[idx] = item->kernelpath;
/* Mount boot device */
if ( -1 == mount(mount_dev, mount_point, mount_fstype,
MS_RDONLY, NULL) ) {
perror("Can't mount boot device");
exit(-1);
}
fprintf(stderr, "load_argv: %s, %s, %s, %s, %s, %s ",
load_argv[0], load_argv[1],
load_argv[2], load_argv[3],
load_argv[4], load_argv[5]);
sleep(4);
/* Load kernel */
n = fexecw(kexec_path, (char *const *)load_argv, envp);
if (-1 == n) {
perror("Kexec can't load kernel");
exit(-1);
}
umount(mount_point);
dispose(cmdline_arg);
dispose(initrd_arg);
/* Check /proc/sys/net presence */
if ( -1 == stat("/proc/sys/net", &sinfo) ) {
if (ENOENT == errno) {
/* We have no network, don't issue ifdown() while kexec'ing */
exec_argv[2] = "-x";
DPRINTF("No network is detected, disabling ifdown()");
} else {
perror("Can't stat /proc/sys/net");
}
}
printf("exec_argv: %s, %s, %s", exec_argv[0],
exec_argv[1], exec_argv[2]);
/* Boot new kernel */
execve(kexec_path, (char *const *)exec_argv, envp);
}
int scan_devices(struct params_t *params)
{
struct charlist *fl;
struct bootconf_t *bootconf;
struct device_t dev;
struct cfgdata_t cfgdata;
int rc,n;
FILE *f;
char mount_dev[16];
char mount_fstype[16];
char str_mtd_id[3];
#ifdef USE_ICONS
kx_cfg_section *sc;
int i;
int rows;
char **xpm_data;
#endif
bootconf = create_bootcfg(4);
if (NULL == bootconf) {
DPRINTF("Can't allocate bootconf structure");
return -1;
}
f = devscan_open(&fl);
if (NULL == f) {
log_msg(lg, "Can't initiate device scan");
return -1;
}
#ifdef USE_ZAURUS
struct zaurus_partinfo_t pinfo;
int zaurus_error = 0;
zaurus_error = zaurus_read_partinfo(&pinfo);
if (0 == zaurus_error) {
/* Fix mtdparts tag */
dispose(params->cfg->mtdparts);
params->cfg->mtdparts = zaurus_mtdparts(&pinfo);
}
#endif
for (;;) {
rc = devscan_next(f, fl, &dev);
if (rc < 0) continue; /* Error */
if (0 == rc) break; /* EOF */
/* initialize with defaults */
strcpy(mount_dev, dev.device);
strcpy(mount_fstype, dev.fstype);
/* We found an ubi erase counter */
if (!strncmp(dev.fstype, "ubi",3)) {
/* attach ubi boot device - mtd id [0-15] */
if(isdigit(atoi(dev.device+strlen(dev.device)-2))) {
strcpy(str_mtd_id, dev.device+strlen(dev.device)-2);
strcat(str_mtd_id, dev.device+strlen(dev.device)-1);
} else {
strcpy(str_mtd_id, dev.device+strlen(dev.device)-1);
}
n = ubi_attach(str_mtd_id);
/* we have attached ubiX and we mount /dev/ubiX_0 */
sprintf(mount_dev, "/dev/ubi%d", n);
/* HARDCODED: first volume */
strcat(mount_dev, "_0");
/* HARDCODED: we assume it's ubifs */
strcpy(mount_fstype, "ubifs");
}
/* Mount device */
if (-1 == mount(mount_dev, MOUNTPOINT, mount_fstype, MS_RDONLY, NULL)) {
log_msg(lg, "+ can't mount device %s: %s", mount_dev, ERRMSG);
goto free_device;
}
/* NOTE: Don't go out before umount'ing */
/* Search boot method and return boot info */
rc = get_bootinfo(&cfgdata);
if (-1 == rc) { /* Error */
goto umount;
}
#ifdef USE_ICONS
/* Iterate over sections found */
if (params->gui) {
for (i = 0; i < cfgdata.count; i++) {
sc = cfgdata.list[i];
if (!sc) continue;
/* Load custom icon */
if (sc->iconpath) {
rows = xpm_load_image(&xpm_data, sc->iconpath);
if (-1 == rows) {
log_msg(lg, "+ can't load xpm icon %s", sc->iconpath);
continue;
}
sc->icondata = xpm_parse_image(xpm_data, rows);
if (!sc->icondata) {
log_msg(lg, "+ can't parse xpm icon %s", sc->iconpath);
continue;
}
xpm_destroy_image(xpm_data, rows);
}
}
}
#endif
umount:
/* Umount device */
if (-1 == umount(MOUNTPOINT)) {
log_msg(lg, "+ can't umount device: %s", ERRMSG);
goto free_cfgdata;
}
if (-1 == rc) { /* Error */
goto free_cfgdata;
}
#ifdef USE_ZAURUS
/* Fix partition sizes. We can have kernel in root and home partitions on NAND */
/* HACK: mtdblock devices are hardcoded */
if (0 == zaurus_error) {
if (0 == strcmp(dev.device, "/dev/mtdblock2")) { /* root */
log_msg(lg, "+ [zaurus root] size of %s will be changed from %llu to %lu",
dev.device, dev.blocks, pinfo.root);
dev.blocks = pinfo.root;
} else if (0 == strcmp(dev.device, "/dev/mtdblock3")) { /* home */
log_msg(lg, "+ [zaurus home] size of %s will be changed from %llu to %lu",
dev.device, dev.blocks, pinfo.home);
dev.blocks = pinfo.home;
}
}
#endif
/* Now we have something in cfgdata */
rc = addto_bootcfg(bootconf, &dev, &cfgdata);
free_cfgdata:
destroy_cfgdata(&cfgdata);
free_device:
free(dev.device);
}
free_charlist(fl);
params->bootcfg = bootconf;
return 0;
}
/* Create system menu */
kx_menu *build_menu(struct params_t *params)
{
kx_menu *menu;
kx_menu_level *ml;
kx_menu_item *mi;
#ifdef USE_ICONS
kx_picture **icons;
if (params->gui) icons = params->gui->icons;
else icons = NULL;
#endif
/* Create menu with 2 levels (main and system) */
menu = menu_create(2);
if (!menu) {
DPRINTF("Can't create menu");
return NULL;
}
/* Create main menu level */
menu->top = menu_level_create(menu, 4, NULL);
/* Create system menu level */
ml = menu_level_create(menu, 6, menu->top);
if (!ml) {
DPRINTF("Can't create system menu");
return menu;
}
mi = menu_item_add(menu->top, A_SUBMENU, "System menu", NULL, ml);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_SYSTEM]);
#endif
mi = menu_item_add(ml, A_PARENTMENU, "Back", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_BACK]);
#endif
mi = menu_item_add(ml, A_RESCAN, "Rescan", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_RESCAN]);
#endif
mi = menu_item_add(ml, A_DEBUG, "Show debug info", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_DEBUG]);
#endif
mi = menu_item_add(ml, A_REBOOT, "Reboot", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_REBOOT]);
#endif
mi = menu_item_add(ml, A_SHUTDOWN, "Shutdown", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_SHUTDOWN]);
#endif
if (!initmode) {
mi = menu_item_add(ml, A_EXIT, "Exit", NULL, NULL);
#ifdef USE_ICONS
if (icons) menu_item_set_data(mi, icons[ICON_EXIT]);
#endif
}
menu->current = menu->top;
menu_item_select(menu, 0);
return menu;
}
/* Fill main menu with boot items */
int fill_menu(struct params_t *params)
{
kx_menu_item *mi;
int i, b_items, max_pri, max_i, *a;
struct boot_item_t *tbi;
struct bootconf_t *bl;
const int sizeof_desc = 160;
char *desc, *label;
#ifdef USE_ICONS
kx_picture *icon;
struct gui_t *gui;
gui = params->gui;
#endif
bl = params->bootcfg;
if ( (NULL != bl) && (bl->fill > 0) ) b_items = bl->fill;
else {
log_msg(lg, "No items for menu found");
return 0;
}
log_msg(lg, "Populating menu: %d item(s)", b_items);
desc = malloc(sizeof_desc);
if (NULL == desc) {
DPRINTF("Can't allocate item description");
goto dirty_exit;
}
a = malloc(b_items * sizeof(*a)); /* Markers array */
if (NULL == a) {
DPRINTF("Can't allocate markers array");
goto dirty_exit;
}
for (i = 0; i < b_items; i++) a[i] = 0; /* Clean markers array */
/* Create menu of sorted by priority boot items */
max_i = -1;
for(;;) {
max_pri = -1;
/* Search item with maximum priority */
for (i = 0; i < b_items; i++) {
if (0 == a[i]) { /* Check that item is not processed yet */
tbi = bl->list[i];
if (tbi->priority > max_pri) {
max_pri = tbi->priority; /* Max priority */
max_i = i; /* Max priority item index */
}
}
}
if (max_pri >= 0) {
a[max_i] = 1; /* Mark item as processed */
/* We have found new max priority - insert into menu */
tbi = bl->list[max_i];
snprintf(desc, sizeof_desc, "%s %s %lluMb",
tbi->device, tbi->fstype, tbi->blocks/1024);
if (tbi->label)
label = tbi->label;
else
label = tbi->kernelpath + sizeof(MOUNTPOINT) - 1;
log_msg(lg, "+ [%s]", label);
mi = menu_item_add(params->menu->top, A_DEVICES + max_i,
label, desc, NULL);
#ifdef USE_ICONS
if (gui) {
/* Search associated with boot item icon if any */
icon = tbi->icondata;
if (!icon && (gui->icons)) {
/* We have no custom icon - use default */
switch (tbi->dtype) {
case DVT_STORAGE:
icon = gui->icons[ICON_STORAGE];
break;
case DVT_MMC:
icon = gui->icons[ICON_MMC];
break;
case DVT_MTD:
icon = gui->icons[ICON_MEMORY];
break;
case DVT_UNKNOWN:
default:
break;
}
}
/* Add icon to menu */
if (mi) mi->data = icon;
}
#endif
}
if (-1 == max_pri) break; /* We have no items to process */
}
free(a);
free(desc);
return 0;
dirty_exit:
dispose(desc);
return -1;
}
/* Return 0 if we are ordinary app or 1 if we are init */
int do_init(void)
{
/* When our pid is 1 we are init-process */
if ( 1 != getpid() ) {
return 0;
}
log_msg(lg, "I'm the init-process!");
#ifdef USE_DEVTMPFS
if (-1 == mount("devtmpfs", "/dev", "devtmpfs",
0, NULL) ) {
perror("Can't mount devtmpfs");
}
#endif
/* Mount procfs */
if ( -1 == mount("proc", "/proc", "proc",
0, NULL) ) {
perror("Can't mount procfs");
exit(-1);
}
/* Mount sysfs */
if ( -1 == mount("sysfs", "/sys", "sysfs",
0, NULL) ) {
perror("Can't mount sysfs");
exit(-1);
}
FILE *f;
/* Set up console loglevel */
f = fopen("/proc/sys/kernel/printk", "w");
if (NULL == f) {
/* CONFIG_PRINTK may be disabled */
log_msg(lg, "/proc/sys/kernel/printk", ERRMSG);
} else {
fputs("0 4 1 7\n", f);
fclose(f);
}
return 1;
}
int do_rescan(struct params_t *params)
{
int i;
/* Clean top menu level except system menu item */
/* FIXME should be done by some function from menu module */
kx_menu_item *mi;
for (i = 1; i < params->menu->top->count; i++) {
mi = params->menu->top->list[i];
if (mi) {
dispose(mi->label);
dispose(mi->description);
free(mi);
}
params->menu->top->list[i] = NULL;
}
params->menu->top->count = 1;
#ifdef USE_ICONS
/* Destroy icons */
/* FIXME should be done by some function from devicescan module */
for (i = 0; i < params->bootcfg->fill; i++) {
fb_destroy_picture(params->bootcfg->list[i]->icondata);
}
#endif
free_bootcfg(params->bootcfg);
params->bootcfg = NULL;
scan_devices(params);
return fill_menu(params);
}
/* Process menu context
* Return 0 to select, <0 to raise error, >0 to continue
*/
int process_ctx_menu(struct params_t *params, int action) {
static int rc;
static int menu_action;
static kx_menu *menu;
menu = params->menu;
#ifdef USE_NUMKEYS
/* Some hacks to allow menu items selection by keys 0-9 */
if ((action >= A_KEY0) && (action <= A_KEY9)) {
rc = action - A_KEY0;
if (-1 == menu_item_select_by_no(menu, rc)) {
/* There is no item with such number - do nothing */
return 1;
} else {
action = A_SELECT;
}
}
#endif
menu_action = (A_SELECT == action ? menu->current->current->id : action);
rc = 1;
switch (menu_action) {
case A_UP:
menu_item_select(menu, -1);
break;
case A_DOWN:
menu_item_select(menu, 1);
break;
case A_SUBMENU:
menu->current = menu->current->current->submenu;
break;
case A_PARENTMENU:
menu->current = menu->current->parent;
break;
case A_REBOOT:
#ifdef USE_FBMENU
gui_show_msg(params->gui, "Rebooting...");
#endif
#ifdef USE_TEXTUI
tui_show_msg(params->tui, "Rebooting...");
#endif
#ifdef USE_HOST_DEBUG
sleep(1);
#else
sync();
/* if ( -1 == reboot(LINUX_REBOOT_CMD_RESTART) ) { */
if ( -1 == reboot(RB_AUTOBOOT) ) {
log_msg(lg, "Can't initiate reboot: %s", ERRMSG);
}
#endif
break;
case A_SHUTDOWN:
#ifdef USE_FBMENU
gui_show_msg(params->gui, "Shutting down...");
#endif
#ifdef USE_TEXTUI
tui_show_msg(params->tui, "Shutting down...");
#endif
#ifdef USE_HOST_DEBUG
sleep(1);
#else
sync();
/* if ( -1 == reboot(LINUX_REBOOT_CMD_POWER_OFF) ) { */
if ( -1 == reboot(RB_POWER_OFF) ) {
log_msg(lg, "Can't initiate shutdown: %s", ERRMSG);
}
#endif
break;
case A_RESCAN:
#ifdef USE_FBMENU
gui_show_msg(params->gui, "Rescanning devices.\nPlease wait...");
#endif
#ifdef USE_TEXTUI
tui_show_msg(params->tui, "Rescanning devices.\nPlease wait...");
#endif
if (-1 == do_rescan(params)) {
log_msg(lg, "Rescan failed");
return -1;
}
menu = params->menu;
break;
case A_DEBUG:
params->context = KX_CTX_TEXTVIEW;
break;
case A_EXIT:
if (initmode) break; // don't exit if we are init
case A_ERROR:
rc = -1;
break;
#ifdef USE_TIMEOUT
case A_TIMEOUT: // timeout was reached - boot 1st kernel if exists
if (menu->current->count > 1) {
menu_item_select(menu, 0); /* choose first item */
menu_item_select(menu, 1); /* and switch to next item */
rc = 0;
}
break;
#endif
default:
if (menu_action >= A_DEVICES) rc = 0;
break;
}
return rc;
}
/* Draw menu context */
void draw_ctx_menu(struct params_t *params)
{
#ifdef USE_FBMENU
gui_show_menu(params->gui, params->menu);
#endif
#ifdef USE_TEXTUI
tui_show_menu(params->tui, params->menu);
#endif
}
/* Process text view context
* Return 0 to select, <0 to raise error, >0 to continue
*/
int process_ctx_textview(struct params_t *params, int action) {
static int rc;
rc = 1;
switch (action) {
case A_UP:
if (lg->current_line_no > 0) --lg->current_line_no;
break;
case A_DOWN:
if (lg->current_line_no + 1 < lg->rows->fill) ++lg->current_line_no;
break;
case A_SELECT:
/* Rewind log view to top. This should make log view usable
* on devices with 2 buttons only (DOWN and SELECT)
*/
lg->current_line_no = 0;
params->context = KX_CTX_MENU;
break;
case A_EXIT:
if (initmode) break; // don't exit if we are init
case A_ERROR:
rc = -1;
break;
}
return rc;
}
/* Draw text view context */
void draw_ctx_textview(struct params_t *params)
{
#ifdef USE_FBMENU
gui_show_text(params->gui, lg);
#endif
#ifdef USE_TEXTUI
tui_show_text(params->tui, lg);
#endif
}
/* Main event loop */
int do_main_loop(struct params_t *params, kx_inputs *inputs)
{
int rc = 0;
int action;
/* Start with menu context */
params->context = KX_CTX_MENU;
draw_ctx_menu(params);
/* Event loop */
do {
/* Read events */
action = inputs_process(inputs);
if (action != A_NONE) {
/* Process events in current context */
switch (params->context) {
case KX_CTX_MENU:
rc = process_ctx_menu(params, action);
break;
case KX_CTX_TEXTVIEW:
rc = process_ctx_textview(params, action);
}
/* Draw current context */
if (rc > 0) {
switch (params->context) {
case KX_CTX_MENU:
draw_ctx_menu(params);
break;
case KX_CTX_TEXTVIEW:
draw_ctx_textview(params);
break;
}
}
}
else
rc = 1;
/* rc: 0 - select, <0 - raise error, >0 - continue */
} while (rc > 0);