@@ -27,18 +27,6 @@
#include <linux/kgdb.h>
#include <linux/kdb.h>
-static int kgdb_nmi_knock = 1;
-module_param_named(knock, kgdb_nmi_knock, int, 0600);
-MODULE_PARM_DESC(knock, "if set to 1 (default), the special '$3#33' command " \
- "must be used to enter the debugger; when set to 0, " \
- "hitting return key is enough to enter the debugger; " \
- "when set to -1, the debugger is entered immediately " \
- "upon NMI");
-
-static char *kgdb_nmi_magic = "$3#33";
-module_param_named(magic, kgdb_nmi_magic, charp, 0600);
-MODULE_PARM_DESC(magic, "magic sequence to enter NMI debugger (default $3#33)");
-
static atomic_t kgdb_nmi_num_readers = ATOMIC_INIT(0);
static int kgdb_nmi_console_setup(struct console *co, char *options)
@@ -95,95 +83,6 @@ struct kgdb_nmi_tty_priv {
static struct tty_port *kgdb_nmi_port;
-static void kgdb_tty_recv(int ch)
-{
- struct kgdb_nmi_tty_priv *priv;
- char c = ch;
-
- if (!kgdb_nmi_port || ch < 0)
- return;
- /*
- * Can't use port->tty->driver_data as tty might be not there. Timer
- * will check for tty and will get the ref, but here we don't have to
- * do that, and actually, we can't: we're in NMI context, no locks are
- * possible.
- */
- priv = container_of(kgdb_nmi_port, struct kgdb_nmi_tty_priv, port);
- kfifo_in(&priv->fifo, &c, 1);
-}
-
-static int kgdb_nmi_poll_one_knock(void)
-{
- static int n;
- int c;
- const char *magic = kgdb_nmi_magic;
- size_t m = strlen(magic);
- bool printch = false;
-
- c = dbg_io_ops->read_char();
- if (c == NO_POLL_CHAR)
- return c;
-
- if (!kgdb_nmi_knock && (c == '\r' || c == '\n')) {
- return 1;
- } else if (c == magic[n]) {
- n = (n + 1) % m;
- if (!n)
- return 1;
- printch = true;
- } else {
- n = 0;
- }
-
- if (atomic_read(&kgdb_nmi_num_readers)) {
- kgdb_tty_recv(c);
- return 0;
- }
-
- if (printch) {
- kdb_printf("%c", c);
- return 0;
- }
-
- kdb_printf("\r%s %s to enter the debugger> %*s",
- kgdb_nmi_knock ? "Type" : "Hit",
- kgdb_nmi_knock ? magic : "<return>", (int)m, "");
- while (m--)
- kdb_printf("\b");
- return 0;
-}
-
-/**
- * kgdb_nmi_poll_knock - Check if it is time to enter the debugger
- *
- * "Serial ports are often noisy, especially when muxed over another port (we
- * often use serial over the headset connector). Noise on the async command
- * line just causes characters that are ignored, on a command line that blocked
- * execution noise would be catastrophic." -- Colin Cross
- *
- * So, this function implements KGDB/KDB knocking on the serial line: we won't
- * enter the debugger until we receive a known magic phrase (which is actually
- * "$3#33", known as "escape to KDB" command. There is also a relaxed variant
- * of knocking, i.e. just pressing the return key is enough to enter the
- * debugger. And if knocking is disabled, the function always returns 1.
- */
-bool kgdb_nmi_poll_knock(void)
-{
- if (kgdb_nmi_knock < 0)
- return true;
-
- while (1) {
- int ret;
-
- ret = kgdb_nmi_poll_one_knock();
- if (ret == NO_POLL_CHAR)
- return false;
- else if (ret == 1)
- break;
- }
- return true;
-}
-
/*
* The tasklet is cheap, it does not cause wakeups when reschedules itself,
* instead it waits for the next tick.
@@ -309,11 +309,9 @@ extern unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs);
#ifdef CONFIG_SERIAL_KGDB_NMI
extern int kgdb_register_nmi_console(void);
extern int kgdb_unregister_nmi_console(void);
-extern bool kgdb_nmi_poll_knock(void);
#else
static inline int kgdb_register_nmi_console(void) { return 0; }
static inline int kgdb_unregister_nmi_console(void) { return 0; }
-static inline bool kgdb_nmi_poll_knock(void) { return true; }
#endif
extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);