static int enable_adaptive_memory(void)
{
char buf[PROP_VALUE_MAX] = {0};
if(property_get("ro.memopt.disable", buf) && !strcmp(buf,"true")){
INFO("disable adaptive memory function\n");
return -1;
}
//for memory > 1024,
if (get_dram_size() > 512) {
property_set("dalvik.vm.heapsize", "384m");
property_set("dalvik.vm.heapstartsize", "8m");
property_set("dalvik.vm.heapgrowthlimit", "96m");
property_set("dalvik.vm.heapminfree", "2m");
property_set("dalvik.vm.heapmaxfree", "8m");
property_set("sys.mem.opt", "false");
property_set("ro.config.low_ram", "false");
} else {
property_set("dalvik.vm.heapsize", "184m");
property_set("dalvik.vm.heapstartsize", "5m");
property_set("dalvik.vm.heapgrowthlimit", "48m");
property_set("dalvik.vm.heapminfree", "512K");
property_set("dalvik.vm.heapmaxfree", "2m");
//aw use
if(strcmp(buf,"true")){
property_set("sys.mem.opt", "true");
}
property_set("ro.config.low_ram", "true");
}
return 0;
}
phys_size_t initdram (int board_type)
{
/*
* ToDo: Move the asm init routine sdram_init() to this C file,
* or even better use some common ppc4xx code available
* in cpu/ppc4xx
*/
sdram_init();
return get_dram_size ();
}
int board_early_init_f (void)
{
#if defined(CONFIG_W7OLMG)
/*
* Setup GPIO pins - reset devices.
*/
out32 (IBM405GP_GPIO0_ODR, 0x10000000); /* one open drain pin */
out32 (IBM405GP_GPIO0_OR, 0x3E000000); /* set output pins to default */
out32 (IBM405GP_GPIO0_TCR, 0x7f800000); /* setup for output */
/*
* IRQ 0-15 405GP internally generated; active high; level sensitive
* IRQ 16 405GP internally generated; active low; level sensitive
* IRQ 17-24 RESERVED
* IRQ 25 (EXT IRQ 0) XILINX; active low; level sensitive
* IRQ 26 (EXT IRQ 1) PCI INT A; active low; level sensitive
* IRQ 27 (EXT IRQ 2) PCI INT B; active low; level sensitive
* IRQ 28 (EXT IRQ 3) SAM 2; active low; level sensitive
* IRQ 29 (EXT IRQ 4) Battery Bad; active low; level sensitive
* IRQ 30 (EXT IRQ 5) Level One PHY; active low; level sensitive
* IRQ 31 (EXT IRQ 6) SAM 1; active high; level sensitive
*/
mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
mtdcr (uicer, 0x00000000); /* disable all ints */
mtdcr (uiccr, 0x00000000); /* set all to be non-critical */
mtdcr (uicpr, 0xFFFFFF80); /* set int polarities */
mtdcr (uictr, 0x10000000); /* set int trigger levels */
mtdcr (uicvcr, 0x00000001); /* set vect base=0,
INT0 highest priority */
mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
#elif defined(CONFIG_W7OLMC)
/*
* Setup GPIO pins
*/
out32 (IBM405GP_GPIO0_ODR, 0x01800000); /* XCV Done Open Drain */
out32 (IBM405GP_GPIO0_OR, 0x03800000); /* set out pins to default */
out32 (IBM405GP_GPIO0_TCR, 0x66C00000); /* setup for output */
/*
* IRQ 0-15 405GP internally generated; active high; level sensitive
* IRQ 16 405GP internally generated; active low; level sensitive
* IRQ 17-24 RESERVED
* IRQ 25 (EXT IRQ 0) DBE 0; active low; level sensitive
* IRQ 26 (EXT IRQ 1) DBE 1; active low; level sensitive
* IRQ 27 (EXT IRQ 2) DBE 2; active low; level sensitive
* IRQ 28 (EXT IRQ 3) DBE Common; active low; level sensitive
* IRQ 29 (EXT IRQ 4) PCI; active low; level sensitive
* IRQ 30 (EXT IRQ 5) RCMM Reset; active low; level sensitive
* IRQ 31 (EXT IRQ 6) PHY; active high; level sensitive
*/
mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
mtdcr (uicer, 0x00000000); /* disable all ints */
mtdcr (uiccr, 0x00000000); /* set all to be non-critical */
mtdcr (uicpr, 0xFFFFFF80); /* set int polarities */
mtdcr (uictr, 0x10000000); /* set int trigger levels */
mtdcr (uicvcr, 0x00000001); /* set vect base=0,
INT0 highest priority */
mtdcr (uicsr, 0xFFFFFFFF); /* clear all ints */
#else /* Unknown */
# error "Unknown W7O board configuration"
#endif
WATCHDOG_RESET (); /* Reset the watchdog */
temp_uart_init (); /* init the uart for debug */
WATCHDOG_RESET (); /* Reset the watchdog */
test_led (); /* test the LEDs */
test_sdram (get_dram_size ()); /* test the dram */
log_stat (ERR_POST1); /* log status,post1 complete */
return 0;
}
long int initdram (int board_type)
{
return get_dram_size ();
}
int main(int argc, char **argv)
{
int fd_count = 0;
struct pollfd ufds[4];
char *tmpdev;
char* debuggable;
char tmp[32];
int property_set_fd_init = 0;
int signal_fd_init = 0;
int keychord_fd_init = 0;
bool is_charger = false; // 判断是否是在充电
char* args_swapon[2];
args_swapon[0] = "swapon_all";;
args_swapon[1] = "/fstab.sun8i";;
char* args_write[3];
args_write[0] = "write";
args_write[1] = "/proc/sys/vm/page-cluster";
args_write[2] = "0";
if (!strcmp(basename(argv[0]), "ueventd"))
return ueventd_main(argc, argv);
if (!strcmp(basename(argv[0]), "watchdogd"))
return watchdogd_main(argc, argv);
/* clear the umask */
umask(0);
/* Get the basic filesystem setup we need put
* together in the initramdisk on / and then we'll
* let the rc file figure out the rest.
*/
// 创建设备节点
mkdir("/dev", 0755);
mkdir("/proc", 0755);
mkdir("/sys", 0755);
mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
mkdir("/dev/pts", 0755);
mkdir("/dev/socket", 0755);
mount("devpts", "/dev/pts", "devpts", 0, NULL);
mount("proc", "/proc", "proc", 0, NULL);
mount("sysfs", "/sys", "sysfs", 0, NULL);
/* indicate that booting is in progress to background fw loaders, etc */
close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
/* We must have some place other than / to create the
* device nodes for kmsg and null, otherwise we won't
* be able to remount / read-only later on.
* Now that tmpfs is mounted on /dev, we can actually
* talk to the outside world.
*/
open_devnull_stdio(); // stdio/stdout/stderr都指向__null__设备
klog_init(); // 从这里创建__kmsg__设备
property_init(); // 1. 完成property的环境变量初始化等动作
get_hardware_name(hardware, &revision);
process_kernel_cmdline(); // 属性初始设置
union selinux_callback cb;
cb.func_log = klog_write;
selinux_set_callback(SELINUX_CB_LOG, cb);
cb.func_audit = audit_callback;
selinux_set_callback(SELINUX_CB_AUDIT, cb);
selinux_initialize();
/* These directories were necessarily created before initial policy load
* and therefore need their security context restored to the proper value.
* This must happen before /dev is populated by ueventd.
*/
restorecon("/dev");
restorecon("/dev/socket");
restorecon("/dev/__properties__");
restorecon_recursive("/sys");
is_charger = !strcmp(bootmode, "charger"); // 从bootloader中获取是否在充电的信息
usb_charge_flag = is_charger;
INFO("property init\n");
if (!is_charger)
property_load_boot_defaults();
get_kernel_cmdline_partitions();
get_kernel_cmdline_signature();
INFO("reading config file\n");
init_parse_config_file("/init.rc");
action_for_each_trigger("early-init", action_add_queue_tail);
queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
queue_builtin_action(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng");
queue_builtin_action(keychord_init_action, "keychord_init");
/* execute all the boot actions to get us started */
action_for_each_trigger("init", action_add_queue_tail);
action_for_each_trigger("early-fs", action_add_queue_tail);
/* skip mounting filesystems in charger mode */
if (!is_charger) {
// 显示initlog.rle，也就是android第二张图片
queue_builtin_action(console_init_action, "console_init");
action_for_each_trigger("fs", action_add_queue_tail);
action_for_each_trigger("post-fs", action_add_queue_tail);
action_for_each_trigger("post-fs-data", action_add_queue_tail);
//SWAP TO ZRAM if low mem devices
if (!(get_dram_size() > 512)) {
char trigger[] = {"early-fs"};
ERROR("***************************LOW MEM DEVICE DETECT");
add_command(trigger, 2, args_swapon);
char trigger2[] = {"post-fs-data"};
add_command(trigger2, 3, args_write);
}
}
/* Repeat mix_hwrng_into_linux_rng in case /dev/hw_random or /dev/random
* wasn't ready immediately after wait_for_coldboot_done
*/
queue_builtin_action(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng");
queue_builtin_action(property_service_init_action, "property_service_init");
queue_builtin_action(signal_init_action, "signal_init");
queue_builtin_action(check_startup_action, "check_startup");
if (is_charger) {
// 如果是charger模式，则调用charger.c
queue_builtin_action(console_init_action, "console_init");
action_for_each_trigger("charger", action_add_queue_tail);
} else {
action_for_each_trigger("early-boot", action_add_queue_tail);
action_for_each_trigger("boot", action_add_queue_tail);
}
/* run all property triggers based on current state of the properties */
queue_builtin_action(queue_property_triggers_action, "queue_property_triggers");
#if BOOTCHART
queue_builtin_action(bootchart_init_action, "bootchart_init");
#endif
for(;;) { // 监视事件 事件处理循环
int nr, i, timeout = -1;
execute_one_command();
restart_processes();
if (!property_set_fd_init && get_property_set_fd() > 0) { // 通过套接字传递信息
ufds[fd_count].fd = get_property_set_fd();
ufds[fd_count].events = POLLIN;
ufds[fd_count].revents = 0;
fd_count++;
property_set_fd_init = 1;
}
if (!signal_fd_init && get_signal_fd() > 0) {
ufds[fd_count].fd = get_signal_fd();
ufds[fd_count].events = POLLIN;
ufds[fd_count].revents = 0;
fd_count++;
signal_fd_init = 1;
}
if (!keychord_fd_init && get_keychord_fd() > 0) {
ufds[fd_count].fd = get_keychord_fd();
ufds[fd_count].events = POLLIN;
ufds[fd_count].revents = 0;
fd_count++;
keychord_fd_init = 1;
}
if (process_needs_restart) {
timeout = (process_needs_restart - gettime()) * 1000;
if (timeout < 0)
timeout = 0;
}
if (!action_queue_empty() || cur_action)
timeout = 0;
#if BOOTCHART
if (bootchart_count > 0) {
if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
timeout = BOOTCHART_POLLING_MS;
if (bootchart_step() < 0 || --bootchart_count == 0) {
bootchart_finish();
bootchart_count = 0;
}
}
#endif
nr = poll(ufds, fd_count, timeout); // 获取事件（热插拔检测）
if (nr <= 0)
continue;
for (i = 0; i < fd_count; i++) { // 处理套接字传回的信息
if (ufds[i].revents & POLLIN) {
if (ufds[i].fd == get_property_set_fd()) // 处理属性变更
handle_property_set_fd();
else if (ufds[i].fd == get_keychord_fd())
handle_keychord();
else if (ufds[i].fd == get_signal_fd()) // 处理子进程传回的信息
handle_signal();
}
}
}
return 0;
}
