* based upon discusions in irc://irc.openprojects.net/#kernelnewbies
*/
+#include <linux/config.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
/* Whether we react on sysrq keys or just ignore them */
int sysrq_enabled = 1;
+/* Loglevel sysrq handler */
static void sysrq_handle_loglevel(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
int i;
i = key - '0';
console_loglevel = 7;
printk("Loglevel set to %d\n", i);
console_loglevel = i;
-}
+}
static struct sysrq_key_op sysrq_loglevel_op = {
.handler = sysrq_handle_loglevel,
.help_msg = "loglevel0-8",
.enable_mask = SYSRQ_ENABLE_LOG,
};
+
+/* SAK sysrq handler */
#ifdef CONFIG_VT
static void sysrq_handle_SAK(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
if (tty)
do_SAK(tty);
.action_msg = "SAK",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
-#else
-#define sysrq_SAK_op (*(struct sysrq_key_op *)0)
#endif
#ifdef CONFIG_VT
+/* unraw sysrq handler */
static void sysrq_handle_unraw(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
struct kbd_struct *kbd = &kbd_table[fg_console];
.action_msg = "Keyboard mode set to XLATE",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
-#else
-#define sysrq_unraw_op (*(struct sysrq_key_op *)0)
#endif /* CONFIG_VT */
+#ifdef CONFIG_KEXEC
+/* crashdump sysrq handler */
static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
-#ifdef CONFIG_KEXEC
crash_kexec(pt_regs);
- /* can't get here if crash image is loaded */
- printk("Kexec: Warning: crash image not loaded\n");
-#endif
- if(panic_on_oops)
- panic("SysRq-triggered panic!\n");
}
static struct sysrq_key_op sysrq_crashdump_op = {
.handler = sysrq_handle_crashdump,
.action_msg = "Trigger a crashdump",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
+#endif
+/* reboot sysrq handler */
static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
- lockdep_off();
local_irq_enable();
emergency_restart();
}
+
static struct sysrq_key_op sysrq_reboot_op = {
.handler = sysrq_handle_reboot,
.help_msg = "reBoot",
};
static void sysrq_handle_sync(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
emergency_sync();
}
+
static struct sysrq_key_op sysrq_sync_op = {
.handler = sysrq_handle_sync,
.help_msg = "Sync",
};
static void sysrq_handle_mountro(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
emergency_remount();
}
+
static struct sysrq_key_op sysrq_mountro_op = {
.handler = sysrq_handle_mountro,
.help_msg = "Unmount",
.enable_mask = SYSRQ_ENABLE_REMOUNT,
};
-#ifdef CONFIG_LOCKDEP
-static void sysrq_handle_showlocks(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+/* END SYNC SYSRQ HANDLERS BLOCK */
+
+#ifdef CONFIG_DEBUG_MUTEXES
+
+static void
+sysrq_handle_showlocks(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
{
- debug_show_all_locks();
+ mutex_debug_show_all_locks();
}
static struct sysrq_key_op sysrq_showlocks_op = {
.help_msg = "show-all-locks(D)",
.action_msg = "Show Locks Held",
};
-#else
-#define sysrq_showlocks_op (*(struct sysrq_key_op *)0)
+
#endif
+/* SHOW SYSRQ HANDLERS BLOCK */
+
static void sysrq_handle_showregs(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
if (pt_regs)
show_regs(pt_regs);
.enable_mask = SYSRQ_ENABLE_DUMP,
};
+
static void sysrq_handle_showstate(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
show_state();
}
.enable_mask = SYSRQ_ENABLE_DUMP,
};
+
static void sysrq_handle_showmem(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
show_mem();
}
.enable_mask = SYSRQ_ENABLE_DUMP,
};
-/*
- * Signal sysrq helper function. Sends a signal to all user processes.
- */
+/* SHOW SYSRQ HANDLERS BLOCK */
+
+
+/* SIGNAL SYSRQ HANDLERS BLOCK */
+
+/* signal sysrq helper function
+ * Sends a signal to all user processes */
static void send_sig_all(int sig)
{
struct task_struct *p;
}
static void sysrq_handle_term(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
send_sig_all(SIGTERM);
console_loglevel = 8;
static void moom_callback(void *ignored)
{
- out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL],
- GFP_KERNEL, 0);
+ out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL], GFP_KERNEL, 0);
}
static DECLARE_WORK(moom_work, moom_callback, NULL);
};
static void sysrq_handle_kill(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+ struct tty_struct *tty)
{
send_sig_all(SIGKILL);
console_loglevel = 8;
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
+/* END SIGNAL SYSRQ HANDLERS BLOCK */
+
static void sysrq_handle_unrt(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
/* Key Operations table and lock */
static DEFINE_SPINLOCK(sysrq_key_table_lock);
-
-static struct sysrq_key_op *sysrq_key_table[36] = {
- &sysrq_loglevel_op, /* 0 */
- &sysrq_loglevel_op, /* 1 */
- &sysrq_loglevel_op, /* 2 */
- &sysrq_loglevel_op, /* 3 */
- &sysrq_loglevel_op, /* 4 */
- &sysrq_loglevel_op, /* 5 */
- &sysrq_loglevel_op, /* 6 */
- &sysrq_loglevel_op, /* 7 */
- &sysrq_loglevel_op, /* 8 */
- &sysrq_loglevel_op, /* 9 */
-
- /*
- * Don't use for system provided sysrqs, it is handled specially on
- * sparc and will never arrive
- */
- NULL, /* a */
- &sysrq_reboot_op, /* b */
- &sysrq_crashdump_op, /* c */
- &sysrq_showlocks_op, /* d */
- &sysrq_term_op, /* e */
- &sysrq_moom_op, /* f */
- NULL, /* g */
- NULL, /* h */
- &sysrq_kill_op, /* i */
- NULL, /* j */
- &sysrq_SAK_op, /* k */
- NULL, /* l */
- &sysrq_showmem_op, /* m */
- &sysrq_unrt_op, /* n */
- /* This will often be registered as 'Off' at init time */
- NULL, /* o */
- &sysrq_showregs_op, /* p */
- NULL, /* q */
- &sysrq_unraw_op, /* r */
- &sysrq_sync_op, /* s */
- &sysrq_showstate_op, /* t */
- &sysrq_mountro_op, /* u */
- /* May be assigned at init time by SMP VOYAGER */
- NULL, /* v */
- NULL, /* w */
- NULL, /* x */
- NULL, /* y */
- NULL /* z */
+#define SYSRQ_KEY_TABLE_LENGTH 36
+static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
+/* 0 */ &sysrq_loglevel_op,
+/* 1 */ &sysrq_loglevel_op,
+/* 2 */ &sysrq_loglevel_op,
+/* 3 */ &sysrq_loglevel_op,
+/* 4 */ &sysrq_loglevel_op,
+/* 5 */ &sysrq_loglevel_op,
+/* 6 */ &sysrq_loglevel_op,
+/* 7 */ &sysrq_loglevel_op,
+/* 8 */ &sysrq_loglevel_op,
+/* 9 */ &sysrq_loglevel_op,
+/* a */ NULL, /* Don't use for system provided sysrqs,
+ it is handled specially on the sparc
+ and will never arrive */
+/* b */ &sysrq_reboot_op,
+#ifdef CONFIG_KEXEC
+/* c */ &sysrq_crashdump_op,
+#else
+/* c */ NULL,
+#endif
+#ifdef CONFIG_DEBUG_MUTEXES
+/* d */ &sysrq_showlocks_op,
+#else
+/* d */ NULL,
+#endif
+/* e */ &sysrq_term_op,
+/* f */ &sysrq_moom_op,
+/* g */ NULL,
+/* h */ NULL,
+/* i */ &sysrq_kill_op,
+/* j */ NULL,
+#ifdef CONFIG_VT
+/* k */ &sysrq_SAK_op,
+#else
+/* k */ NULL,
+#endif
+/* l */ NULL,
+/* m */ &sysrq_showmem_op,
+/* n */ &sysrq_unrt_op,
+/* o */ NULL, /* This will often be registered
+ as 'Off' at init time */
+/* p */ &sysrq_showregs_op,
+/* q */ NULL,
+#ifdef CONFIG_VT
+/* r */ &sysrq_unraw_op,
+#else
+/* r */ NULL,
+#endif
+/* s */ &sysrq_sync_op,
+/* t */ &sysrq_showstate_op,
+/* u */ &sysrq_mountro_op,
+/* v */ NULL, /* May be assigned at init time by SMP VOYAGER */
+/* w */ NULL,
+/* x */ NULL,
+/* y */ NULL,
+/* z */ NULL
};
/* key2index calculation, -1 on invalid index */
-static int sysrq_key_table_key2index(int key)
-{
+static int sysrq_key_table_key2index(int key) {
int retval;
-
- if ((key >= '0') && (key <= '9'))
+ if ((key >= '0') && (key <= '9')) {
retval = key - '0';
- else if ((key >= 'a') && (key <= 'z'))
+ } else if ((key >= 'a') && (key <= 'z')) {
retval = key + 10 - 'a';
- else
+ } else {
retval = -1;
+ }
return retval;
}
/*
* get and put functions for the table, exposed to modules.
*/
-struct sysrq_key_op *__sysrq_get_key_op(int key)
-{
- struct sysrq_key_op *op_p = NULL;
- int i;
+struct sysrq_key_op *__sysrq_get_key_op (int key) {
+ struct sysrq_key_op *op_p;
+ int i;
+
i = sysrq_key_table_key2index(key);
- if (i != -1)
- op_p = sysrq_key_table[i];
+ op_p = (i == -1) ? NULL : sysrq_key_table[i];
return op_p;
}
-static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
-{
- int i = sysrq_key_table_key2index(key);
+static void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p) {
+ int i;
+ i = sysrq_key_table_key2index(key);
if (i != -1)
sysrq_key_table[i] = op_p;
}
/*
- * This is the non-locking version of handle_sysrq. It must/can only be called
- * by sysrq key handlers, as they are inside of the lock
+ * This is the non-locking version of handle_sysrq
+ * It must/can only be called by sysrq key handlers,
+ * as they are inside of the lock
*/
-void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty,
- int check_mask)
+
+void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty, int check_mask)
{
struct sysrq_key_op *op_p;
int orig_log_level;
- int i;
+ int i, j;
unsigned long flags;
spin_lock_irqsave(&sysrq_key_table_lock, flags);
op_p = __sysrq_get_key_op(key);
if (op_p) {
- /*
- * Should we check for enabled operations (/proc/sysrq-trigger
- * should not) and is the invoked operation enabled?
- */
+ /* Should we check for enabled operations (/proc/sysrq-trigger should not)
+ * and is the invoked operation enabled? */
if (!check_mask || sysrq_enabled == 1 ||
(sysrq_enabled & op_p->enable_mask)) {
- printk("%s\n", op_p->action_msg);
+ printk ("%s\n", op_p->action_msg);
console_loglevel = orig_log_level;
op_p->handler(key, pt_regs, tty);
- } else {
- printk("This sysrq operation is disabled.\n");
}
+ else
+ printk("This sysrq operation is disabled.\n");
} else {
printk("HELP : ");
/* Only print the help msg once per handler */
- for (i = 0; i < ARRAY_SIZE(sysrq_key_table); i++) {
- if (sysrq_key_table[i]) {
- int j;
-
- for (j = 0; sysrq_key_table[i] !=
- sysrq_key_table[j]; j++)
- ;
- if (j != i)
- continue;
- printk("%s ", sysrq_key_table[i]->help_msg);
- }
+ for (i=0; i<SYSRQ_KEY_TABLE_LENGTH; i++)
+ if (sysrq_key_table[i]) {
+ for (j=0; sysrq_key_table[i] != sysrq_key_table[j]; j++);
+ if (j == i)
+ printk ("%s ", sysrq_key_table[i]->help_msg);
}
- printk("\n");
+ printk ("\n");
console_loglevel = orig_log_level;
}
spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
* This function is called by the keyboard handler when SysRq is pressed
* and any other keycode arrives.
*/
+
void handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
{
if (!sysrq_enabled)
return;
__handle_sysrq(key, pt_regs, tty, 1);
}
-EXPORT_SYMBOL(handle_sysrq);
static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
- struct sysrq_key_op *remove_op_p)
-{
+ struct sysrq_key_op *remove_op_p) {
int retval;
unsigned long flags;
retval = -1;
}
spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+
return retval;
}
{
return __sysrq_swap_key_ops(key, op_p, NULL);
}
-EXPORT_SYMBOL(register_sysrq_key);
int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
{
return __sysrq_swap_key_ops(key, NULL, op_p);
}
+
+EXPORT_SYMBOL(handle_sysrq);
+EXPORT_SYMBOL(register_sysrq_key);
EXPORT_SYMBOL(unregister_sysrq_key);
git://git.onelab.eu / linux-2.6.git / blobdiff