static int kdb_check_kbd_exists(void)
{
static int kbd_exists = -1;
/* One time init */
if (kbd_exists == -1) {
if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
(kbd_read_status() == 0xff &&
kbd_read_input() == 0xff))
kbd_exists = 0;
else
kbd_exists = 1;
}
return kbd_exists;
}
/*
* Check if the keyboard controller has a keypress for us.
* Some parts (Enter Release, LED change) are still blocking polled here,
* but hopefully they are all short.
*/
static int get_kbd_char(void)
{
int scancode, scanstatus;
static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */
static int shift_key; /* Shift next keypress */
static int ctrl_key;
u_short keychar;
extern u_short plain_map[], shift_map[], ctrl_map[];
if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
(inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) {
kbd_exists = 0;
return -1;
}
kbd_exists = 1;
if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
return -1;
/*
* Fetch the scancode
*/
scancode = inb(KBD_DATA_REG);
scanstatus = inb(KBD_STATUS_REG);
/*
* Ignore mouse events.
*/
if (scanstatus & KBD_STAT_MOUSE_OBF)
return -1;
/*
* Ignore release, trigger on make
* (except for shift keys, where we want to
* keep the shift state so long as the key is
* held down).
*/
if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) {
/*
* Next key may use shift table
*/
if ((scancode & 0x80) == 0) {
shift_key=1;
} else {
shift_key=0;
}
return -1;
}
if ((scancode&0x7f) == 0x1d) {
/*
* Left ctrl key
*/
if ((scancode & 0x80) == 0) {
ctrl_key = 1;
} else {
ctrl_key = 0;
}
return -1;
}
if ((scancode & 0x80) != 0)
return -1;
scancode &= 0x7f;
/*
* Translate scancode
*/
if (scancode == 0x3a) {
/*
* Toggle caps lock
*/
shift_lock ^= 1;
#ifdef KDB_BLINK_LED
kdb_toggleled(0x4);
#endif
return -1;
}
if (scancode == 0x0e) {
/*
* Backspace
*/
return 8;
}
/* Special Key */
switch (scancode) {
case 0xF: /* Tab */
return 9;
case 0x53: /* Del */
return 4;
case 0x47: /* Home */
return 1;
case 0x4F: /* End */
return 5;
case 0x4B: /* Left */
return 2;
case 0x48: /* Up */
return 16;
case 0x50: /* Down */
return 14;
case 0x4D: /* Right */
return 6;
}
if (scancode == 0xe0) {
return -1;
}
/*
* For Japanese 86/106 keyboards
* See comment in drivers/char/pc_keyb.c.
* - Masahiro Adegawa
*/
if (scancode == 0x73) {
scancode = 0x59;
} else if (scancode == 0x7d) {
scancode = 0x7c;
}
if (!shift_lock && !shift_key && !ctrl_key) {
keychar = plain_map[scancode];
} else if (shift_lock || shift_key) {
keychar = shift_map[scancode];
} else if (ctrl_key) {
keychar = ctrl_map[scancode];
} else {
keychar = 0x0020;
kdb_printf("Unknown state/scancode (%d)\n", scancode);
}
keychar &= 0x0fff;
if (keychar == '\t')
keychar = ' ';
switch (KTYP(keychar)) {
case KT_LETTER:
case KT_LATIN:
if (isprint(keychar))
break; /* printable characters */
/* drop through */
case KT_SPEC:
if (keychar == K_ENTER)
break;
/* drop through */
default:
return(-1); /* ignore unprintables */
}
if ((scancode & 0x7f) == 0x1c) {
/*
* enter key. All done. Absorb the release scancode.
*/
while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
;
/*
* Fetch the scancode
*/
scancode = inb(KBD_DATA_REG);
scanstatus = inb(KBD_STATUS_REG);
while (scanstatus & KBD_STAT_MOUSE_OBF) {
scancode = inb(KBD_DATA_REG);
scanstatus = inb(KBD_STATUS_REG);
}
if (scancode != 0x9c) {
/*
* Wasn't an enter-release, why not?
*/
kdb_printf("kdb: expected enter got 0x%x status 0x%x\n",
scancode, scanstatus);
}
kdb_printf("\n");
return 13;
}
return keychar & 0xff;
}
asmlinkage void __init start_kernel(void)
{
char * command_line;
extern struct kernel_param __start___param[], __stop___param[];
smp_setup_processor_id();
/*
* Need to run as early as possible, to initialize the
* lockdep hash:
*/
unwind_init();
lockdep_init();
local_irq_disable();
early_boot_irqs_off();
early_init_irq_lock_class();
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them
*/
lock_kernel();
tick_init();
boot_cpu_init();
page_address_init();
printk(KERN_NOTICE);
printk(linux_banner);
setup_arch(&command_line);
setup_command_line(command_line);
unwind_setup();
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
/*
* Set up the scheduler prior starting any interrupts (such as the
* timer interrupt). Full topology setup happens at smp_init()
* time - but meanwhile we still have a functioning scheduler.
*/
sched_init();
/*
* Disable preemption - early bootup scheduling is extremely
* fragile until we cpu_idle() for the first time.
*/
preempt_disable();
build_all_zonelists();
page_alloc_init();
printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
parse_early_param();
parse_args("Booting kernel", static_command_line, __start___param,
__stop___param - __start___param,
&unknown_bootoption);
if (!irqs_disabled()) {
printk(KERN_WARNING "start_kernel(): bug: interrupts were "
"enabled *very* early, fixing it\n");
local_irq_disable();
}
sort_main_extable();
trap_init();
rcu_init();
init_IRQ();
pidhash_init();
init_timers();
hrtimers_init();
softirq_init();
timekeeping_init();
time_init();
profile_init();
if (!irqs_disabled())
printk("start_kernel(): bug: interrupts were enabled early\n");
early_boot_irqs_on();
local_irq_enable();
/*
* HACK ALERT! This is early. We're enabling the console before
* we've done PCI setups etc, and console_init() must be aware of
* this. But we do want output early, in case something goes wrong.
*/
console_init();
if (panic_later)
panic(panic_later, panic_param);
lockdep_info();
/*
* Need to run this when irqs are enabled, because it wants
* to self-test [hard/soft]-irqs on/off lock inversion bugs
* too:
*/
locking_selftest();
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && !initrd_below_start_ok &&
initrd_start < min_low_pfn << PAGE_SHIFT) {
printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
"disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
#endif
vfs_caches_init_early();
cpuset_init_early();
mem_init();
kmem_cache_init();
setup_per_cpu_pageset();
numa_policy_init();
if (late_time_init)
late_time_init();
calibrate_delay();
if(print_me)
{
printk("HELLO AND WELCOME TO THE WORLD OF TOMORROW!\n");
}
pidmap_init();
pgtable_cache_init();
prio_tree_init();
anon_vma_init();
#ifdef CONFIG_KDB
kdb_init();
if (KDB_FLAG(EARLYKDB)) {
KDB_ENTER();
}
#endif /* CONFIG_KDB */
#ifdef CONFIG_X86
if (efi_enabled)
efi_enter_virtual_mode();
#endif
fork_init(num_physpages);
proc_caches_init();
buffer_init();
unnamed_dev_init();
key_init();
security_init();
vfs_caches_init(num_physpages);
radix_tree_init();
signals_init();
/* rootfs populating might need page-writeback */
page_writeback_init();
#ifdef CONFIG_PROC_FS
proc_root_init();
#endif
cpuset_init();
taskstats_init_early();
delayacct_init();
check_bugs();
acpi_early_init(); /* before LAPIC and SMP init */
/* Do the rest non-__init'ed, we're now alive */
rest_init();
}
void
smp_kdb_stop(void)
{
if (!KDB_FLAG(NOIPI))
send_IPI_allbutself(KDB_VECTOR);
}
