Re: [Kgdb-bugreport] [PATCH][1/3] Update CVS KGDB's serial driver

[Amit S. Kale]

On Thursday 26 Feb 2004 3:06 am, Tom Rini wrote:
> The following updates the serial driver with the fixes / cleanups that
> are in George's version of the driver.  There's a few slightly 'odd'
> things in this patch, which stem from the fact that in my next round of
> patches there will (a) be kernel/Kconfig.kgdb and (b) 1 kgdb i/o driver
> at a time.

Please send them in consecutive emails. Having separate patches is fine.
I can't figure out from this patch how a user is going to configure kgdb 8250 
options from menuconfig.

-Amit

>
> # This is a BitKeeper generated patch for the following project:
> # Project Name: Linux kernel tree
> # This patch format is intended for GNU patch command version 2.5 or
> higher. # This patch includes the following deltas:
> #	           ChangeSet	1.1662  -> 1.1663
> #	drivers/serial/kgdb_8250.c	1.2     -> 1.3
> #	       kernel/kgdb.c	1.2     -> 1.3
> #	drivers/serial/Kconfig	1.21    -> 1.22
> #	include/linux/kgdb.h	1.2     -> 1.3
> #
> # The following is the BitKeeper ChangeSet Log
> # --------------------------------------------
> # 04/02/25	trini@xxxxxxxxxxxxxxxxxxx	1.1663
> # Serial update.
> # --------------------------------------------
> #
> diff -Nru a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> --- a/drivers/serial/Kconfig	Wed Feb 25 14:21:26 2004
> +++ b/drivers/serial/Kconfig	Wed Feb 25 14:21:26 2004
> @@ -13,6 +13,27 @@
>  	  Uses generic serial port (8250) for kgdb. This is independent of the
>  	  option 9250/16550 and compatible serial port.
>
> +config KGDB_PORT
> +	hex "hex I/O port address of the debug serial port"
> +	depends on KGDB_8250
> +	default  3f8
> +	help
> +	  Some systems (x86 family at this writing) allow the port
> +	  address to be configured.  The number entered is assumed to be
> +	  hex, don't put 0x in front of it.  The standard address are:
> +	  COM1 3f8 , irq 4 and COM2 2f8 irq 3.  Setserial /dev/ttySx
> +	  will tell you what you have.  It is good to test the serial
> +	  connection with a live system before trying to debug.
> +
> +config KGDB_IRQ
> +	int "IRQ of the debug serial port"
> +	depends on KGDB_8250
> +	default 4
> +	help
> +	  This is the irq for the debug port.  If everything is working
> +	  correctly and the kernel has interrupts on a control C to the
> +	  port should cause a break into the kernel debug stub.
> +
>  #
>  # The new 8250/16550 serial drivers
>  config SERIAL_8250
> diff -Nru a/drivers/serial/kgdb_8250.c b/drivers/serial/kgdb_8250.c
> --- a/drivers/serial/kgdb_8250.c	Wed Feb 25 14:21:26 2004
> +++ b/drivers/serial/kgdb_8250.c	Wed Feb 25 14:21:26 2004
> @@ -1,137 +1,218 @@
>  /*
>   * 8250 interface for kgdb.
>   *
> - * Restructured for making kgdb capable of handling different types of
> serial - * interfaces, by Amit Kale (amitkale@xxxxxxxxxxxxx)
> - *
> - * Written (hacked together) by David Grothe (dave@xxxxxxxx)
> - *
> - * Modified by Scott Foehner (sfoehner@xxxxxxxxxxxx) to allow connect
> - * on boot-up
> + * This is a merging of many different drivers, and all of the people have
> + * had an impact in some form or another:
>   *
> + * Amit Kale <amitkale@xxxxxxxxxxxxx>
> + * David Grothe <dave@xxxxxxxx>
> + * Scott Foehner <sfoehner@xxxxxxxxxxxx>
> + * George Anzinger <george@xxxxxxxxxx>
> + * Robert Walsh <rjwalsh@xxxxxxxxxxxx>
> + * wangdi <wangdi@xxxxxxxxxxxxx>
> + * San Mehat
> + * Tom Rini <trini@xxxxxxxxxx>
>   */
>
> -#include <linux/module.h>
> -#include <linux/errno.h>
> -#include <linux/signal.h>
> -#include <linux/sched.h>
> -#include <linux/timer.h>
> +#include <linux/config.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/spinlock.h>
> +#include <linux/kgdb.h>
>  #include <linux/interrupt.h>
>  #include <linux/tty.h>
> -#include <linux/tty_flip.h>
>  #include <linux/serial.h>
>  #include <linux/serial_core.h>
>  #include <linux/serial_reg.h>
>  #include <linux/serialP.h>
> -#include <linux/config.h>
> -#include <linux/major.h>
> -#include <linux/string.h>
> -#include <linux/fcntl.h>
> -#include <linux/termios.h>
> -#include <linux/kgdb.h>
>
> -#include <asm/system.h>
>  #include <asm/io.h>
> -#include <asm/segment.h>
> -#include <asm/bitops.h>
> -#include <asm/system.h>
> -#include <asm/irq.h>
> -#include <asm/atomic.h>
> +#include <asm/serial.h>		/* For BASE_BAUD and SERIAL_PORT_DFNS */
>
>  #define GDB_BUF_SIZE	512	/* power of 2, please */
>
> +#if defined(CONFIG_KGDB_9600BAUD)
> +#define SERIAL_BAUD 9600
> +#elif defined(CONFIG_KGDB_19200BAUD)
> +#define SERIAL_BAUD 19200
> +#elif defined(CONFIG_KGDB_38400BAUD)
> +#define SERIAL_BAUD 38400
> +#elif defined(CONFIG_KGDB_57600BAUD)
> +#define SERIAL_BAUD 57600
> +#elif defined(CONFIG_KGDB_115200BAUD)
> +#define SERIAL_BAUD 115200
> +#else
> +#define SERIAL_BAUD 115200	/* Start with this if not given */
> +#endif
> +
> +#if defined(CONFIG_KGDB_TTYS0)
> +#define KGDB_PORT 0
> +#elif defined(CONFIG_KGDB_TTYS1)
> +#define KGDB_PORT 1
> +#elif defined(CONFIG_KGDB_TTYS2)
> +#define KGDB_PORT 2
> +#elif defined(CONFIG_KGDB_TTYS3)
> +#define KGDB_PORT 3
> +#else
> +#define KGDB_PORT 0		/* Start with this if not given */
> +#endif
> +
> +int kgdb8250_baud = SERIAL_BAUD;
> +int kgdb8250_ttyS = KGDB_PORT;
> +
>  static char kgdb8250_buf[GDB_BUF_SIZE];
>  static int kgdb8250_buf_in_inx;
>  static atomic_t kgdb8250_buf_in_cnt;
>  static int kgdb8250_buf_out_inx;
>
> -static int kgdb8250_got_dollar = -3, kgdb8250_got_H = -3,
> -    kgdb8250_interrupt_iteration = 0;
> +/* Determine serial information. */
> +static struct serial_state state = {
> +	.magic = SSTATE_MAGIC,
> +	.baud_base = BASE_BAUD,
> +	.custom_divisor = BASE_BAUD / SERIAL_BAUD,
> +};
>
> -/* We only allow for 4 ports to be registered.  We default to standard
> - * PC values. */
> -static struct uart_port rs_table[4] = {
> -	{.line = 0x3f8,.irq = 4},
> -	{.line = 0x2f8,.irq = 3},
> -	{.line = 0x3e8,.irq = 4},
> -	{.line = 0x2e8,.irq = 3},
> +static struct async_struct gdb_async_info = {
> +	.magic = SERIAL_MAGIC,
> +	.state = &state,
> +	.tty = (struct tty_struct *) &state,
>  };
> -static void (*serial_outb) (unsigned char, unsigned long);
> -static unsigned long (*serial_inb) (unsigned long);
> +
> +/* Space between registers. */
> +static int reg_shift;
> +
> +/* Not all arches define this. */
> +#ifndef SERIAL_PORT_DFNS
> +#define SERIAL_PORT_DFNS
> +#endif
> +static struct serial_state rs_table[] = {
> +	SERIAL_PORT_DFNS	/* defined in <asm/serial.h> */
> +};
> +
> +/* Do we need to look in the rs_table? */
> +static int serial_from_rs_table = 0;
> +
> +static void (*serial_outb) (unsigned char val, unsigned long addr);
> +static unsigned long (*serial_inb) (unsigned long addr);
>
>  int serial8250_release_irq(int irq);
>
> -int kgdb8250_irq;
> -unsigned long kgdb8250_port;
> +static int kgdb8250_init(void);
> +static unsigned long kgdb8250_port;
>
> -int kgdb8250_baud = 115200;
> -int kgdb8250_ttyS;
> +static int initialized = -1;
>
> -static unsigned long direct_inb(unsigned long addr)
> +static unsigned long
> +direct_inb(unsigned long addr)
>  {
>  	return readb(addr);
>  }
>
> -static void direct_outb(unsigned char val, unsigned long addr)
> +static void
> +direct_outb(unsigned char val, unsigned long addr)
>  {
>  	writeb(val, addr);
>  }
>
> -static unsigned long io_inb(unsigned long port)
> +static unsigned long
> +io_inb(unsigned long port)
>  {
>  	return inb(port);
>  }
>
> -static void io_outb(unsigned char val, unsigned long port)
> +static void
> +io_outb(unsigned char val, unsigned long port)
>  {
>  	outb(val, port);
>  }
>
>  /*
> - * Get a byte from the hardware data buffer and return it
> - * Get a char if available, return -EAGAIN if nothing available.
> + * Wait until the interface can accept a char, then write it.
>   */
> -static int read_data_bfr(void)
> +void
> +kgdb_put_debug_char(int chr)
>  {
> -	if (serial_inb(kgdb8250_port + UART_LSR) & UART_LSR_DR)
> -		return (serial_inb(kgdb8250_port + UART_RX));
> +	while (!(serial_inb(kgdb8250_port + (UART_LSR << reg_shift)) &
> +		UART_LSR_THRE))
> +		;
>
> -	return -EAGAIN;
> +	serial_outb(chr, kgdb8250_port + (UART_TX << reg_shift));
>  }
>
>  /*
> - * Empty the receive buffer first, then look at the interface hardware.
> - * It waits for a character from the serial interface and then returns it.
> + * Get a byte from the hardware data buffer and return it
>   */
> -static int kgdb8250_read_char(void)
> +static int
> +read_data_bfr(void)
>  {
> -	int retchar;
> -	if (atomic_read(&kgdb8250_buf_in_cnt) != 0) {
> -		/* intr routine has q'd chars read them from buffer */
> -		int chr;
> +	char it = serial_inb(kgdb8250_port + (UART_LSR << reg_shift));
>
> -		chr = kgdb8250_buf[kgdb8250_buf_out_inx++];
> -		kgdb8250_buf_out_inx &= (GDB_BUF_SIZE - 1);
> -		atomic_dec(&kgdb8250_buf_in_cnt);
> -		return chr;
> +	if (it & UART_LSR_DR)
> +		return serial_inb(kgdb8250_port + (UART_RX << reg_shift));
> +
> +	/*
> +	 * If we have a framing error assume somebody messed with
> +	 * our uart.  Reprogram it and send '-' both ways...
> +	 */
> +	if (it & 0xc) {
> +		kgdb8250_init();
> +		kgdb_put_debug_char('-');
> +		return '-';
>  	}
> -	do {
> -		/* read from hardware */
> -		retchar = read_data_bfr();
> -	} while (retchar < 0);
> -	return retchar;
> +
> +	return -1;
>  }
>
>  /*
> - * Wait until the interface can accept a char, then write it.
> + * Get a char if available, return -1 if nothing available.
> + * Empty the receive buffer first, then look at the interface hardware.
> + *
> + * Locking here is a bit of a problem.	We MUST not lock out communication
> + * if we are trying to talk to gdb about a kgdb entry.	ON the other hand
> + * we can loose chars in the console pass thru if we don't lock.  It is
> also + * possible that we could hold the lock or be waiting for it when
> kgdb + * NEEDS to talk.  Since kgdb locks down the world, it does not need
> locks. + * We do, of course have possible issues with interrupting a uart
> operation, + * but we will just depend on the uart status to help keep that
> straight. */
> -static void kgdb8250_write_char(int chr)
> +
> +static spinlock_t uart_interrupt_lock = SPIN_LOCK_UNLOCKED;
> +#ifdef CONFIG_SMP
> +extern spinlock_t kgdb_spinlock;
> +#endif
> +
> +int
> +kgdb_get_debug_char(void)
>  {
> -	while (!(serial_inb(kgdb8250_port + UART_LSR) & UART_LSR_THRE))
> -		/* Do nothing */ ;
> +	int retchr;
> +	unsigned long flags;
> +	local_irq_save(flags);
> +#ifdef CONFIG_SMP
> +	if (!spin_is_locked(&kgdb_spinlock)) {
> +		spin_lock(&uart_interrupt_lock);
> +	}
> +#endif
> +	/* intr routine has q'd chars */
> +	if (atomic_read(&kgdb8250_buf_in_cnt) != 0) {
> +		retchr = kgdb8250_buf[kgdb8250_buf_out_inx++];
> +		kgdb8250_buf_out_inx &= (GDB_BUF_SIZE - 1);
> +		atomic_dec(&kgdb8250_buf_in_cnt);
> +		goto out;
> +	}
> +
> +	do {
> +		retchr = read_data_bfr();
> +	} while (retchr < 0);
>
> -	serial_outb(chr, kgdb8250_port + UART_TX);
> +out:
> +#ifdef CONFIG_SMP
> +	if (!spin_is_locked(&kgdb_spinlock)) {
> +		spin_unlock(&uart_interrupt_lock);
> +	}
> +#endif
> +	local_irq_restore(flags);
>
> +	return retchr;
>  }
>
>  /*
> @@ -139,12 +220,12 @@
>   * It will receive a limited number of characters of input
>   * from the gdb  host machine and save them up in a buffer.
>   *
> - * When kgdb8250_read_char() is called it
> + * When kgdb_get_debug_char() is called it
>   * draws characters out of the buffer until it is empty and
>   * then reads directly from the serial port.
>   *
>   * We do not attempt to write chars from the interrupt routine
> - * since the stubs do all of that via kgdb8250_write_char() which
> + * since the stubs do all of that via kgdb_put_debug_char() which
>   * writes one byte after waiting for the interface to become
>   * ready.
>   *
> @@ -156,15 +237,27 @@
>   * care to learn can make this work for any low level serial
>   * driver.
>   */
> -static irqreturn_t kgdb8250_interrupt(int irq, void *dev_id,
> -				      struct pt_regs *regs)
> +static irqreturn_t
> +kgdb8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
>  {
> -	int chr;
> -	int iir;
> +	int chr, iir;
> +	unsigned long flags;
> +
> +	if (irq != gdb_async_info.line)
> +		return IRQ_NONE;
> +
> +	/* If we get an interrupt, then KGDB is trying to connect. */
> +	if (!kgdb_connected) {
> +		breakpoint();
> +		return IRQ_HANDLED;
> +	}
> +
> +	local_irq_save(flags);
> +	spin_lock(&uart_interrupt_lock);
>
>  	do {
>  		chr = read_data_bfr();
> -		iir = serial_inb(kgdb8250_port + UART_IIR);
> +		iir = serial_inb(kgdb8250_port + (UART_IIR << reg_shift));
>  		if (chr < 0)
>  			continue;
>
> @@ -174,28 +267,6 @@
>  			continue;
>  		}
>
> -		if (atomic_read(&kgdb_killed_or_detached)) {
> -			if (chr == '$')
> -				kgdb8250_got_dollar =
> -				    kgdb8250_interrupt_iteration;
> -			if (kgdb8250_interrupt_iteration ==
> -			    kgdb8250_got_dollar + 1 && chr == 'H')
> -				kgdb8250_got_H = kgdb8250_interrupt_iteration;
> -			else if (kgdb8250_interrupt_iteration ==
> -				 kgdb8250_got_H + 1 && chr == 'c') {
> -				kgdb8250_buf[kgdb8250_buf_in_inx++] = chr;
> -				atomic_inc(&kgdb8250_buf_in_cnt);
> -				atomic_set(&kgdb_might_be_resumed, 1);
> -				wmb();
> -				breakpoint();
> -				atomic_set(&kgdb_might_be_resumed, 0);
> -				kgdb8250_interrupt_iteration = 0;
> -				kgdb8250_got_dollar = -3;
> -				kgdb8250_got_H = -3;
> -				continue;
> -			}
> -		}
> -
>  		if (atomic_read(&kgdb8250_buf_in_cnt) >= GDB_BUF_SIZE) {
>  			/* buffer overflow, clear it */
>  			kgdb8250_buf_in_inx = 0;
> @@ -207,33 +278,30 @@
>  		kgdb8250_buf[kgdb8250_buf_in_inx++] = chr;
>  		kgdb8250_buf_in_inx &= (GDB_BUF_SIZE - 1);
>  		atomic_inc(&kgdb8250_buf_in_cnt);
> -	}
> -	while (iir & UART_IIR_RDI);
> +	} while (iir & UART_IIR_RDI);
>
> -	if (atomic_read(&kgdb_killed_or_detached))
> -		kgdb8250_interrupt_iteration++;
> +	spin_unlock(&uart_interrupt_lock);
> +	local_irq_restore(flags);
>
>  	return IRQ_HANDLED;
> -
>  }
>
>  /*
> - * Initializes serial port.
> - *	ttyS - integer specifying which serial port to use for debugging
> - *	baud - baud rate of specified serial port
> + *  Returns:
> + *	0 on success, 1 on failure.
>   */
> -static int kgdb8250_init(int ttyS, int baud)
> +static int
> +kgdb8250_init(void)
>  {
>  	unsigned cval;
>  	int bits = 8;
>  	int parity = 'n';
>  	int cflag = CREAD | HUPCL | CLOCAL;
> -	int quot = 0;
>
>  	/*
>  	 *      Now construct a cflag setting.
>  	 */
> -	switch (baud) {
> +	switch (kgdb8250_baud) {
>  	case 1200:
>  		cflag |= B1200;
>  		break;
> @@ -256,7 +324,7 @@
>  		cflag |= B115200;
>  		break;
>  	default:
> -		baud = 9600;
> +		kgdb8250_baud = 9600;
>  		/* Fall through */
>  	case 9600:
>  		cflag |= B9600;
> @@ -287,7 +355,6 @@
>  	 *
>  	 */
>
> -	quot = (1843200 / 16) / baud;
>  	cval = cflag & (CSIZE | CSTOPB);
>  	cval >>= 4;
>  	if (cflag & PARENB)
> @@ -300,75 +367,118 @@
>  	 *      and set speed.
>  	 */
>  	cval = 0x3;
> -	serial_outb(cval | UART_LCR_DLAB, kgdb8250_port + UART_LCR);	/* set DLAB
> */ -	serial_outb(quot & 0xff, kgdb8250_port + UART_DLL);	/* LS of divisor
> */ -	serial_outb(quot >> 8, kgdb8250_port + UART_DLM);	/* MS of divisor */
> -	serial_outb(cval, kgdb8250_port + UART_LCR);	/* reset DLAB */
> -	serial_outb(UART_IER_RDI, kgdb8250_port + UART_IER);	/* turn on
> interrupts */ +	/* set DLAB */
> +	serial_outb(cval | UART_LCR_DLAB, kgdb8250_port +
> +			(UART_LCR << reg_shift));
> +	/* LS */
> +	serial_outb(gdb_async_info.state->custom_divisor & 0xff,
> +			kgdb8250_port + (UART_DLL << reg_shift));
> +	/* MS  */
> +	serial_outb(gdb_async_info.state->custom_divisor >> 8,
> +			kgdb8250_port + (UART_DLM << reg_shift));
> +	/* reset DLAB */
> +	serial_outb(cval, kgdb8250_port + (UART_LCR << reg_shift));
> +	/* turn on interrupts */
> +	serial_outb(UART_IER_RDI, kgdb8250_port + (UART_IER << reg_shift));
>  	serial_outb(UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS,
> -		    kgdb8250_port + UART_MCR);
> +		    kgdb8250_port + (UART_MCR << reg_shift));
>
>  	/*
>  	 *      If we read 0xff from the LSR, there is no UART here.
>  	 */
> -	if (serial_inb(kgdb8250_port + UART_LSR) == 0xff)
> -		return -ENODEV;
> +	if (serial_inb(kgdb8250_port + (UART_LSR << reg_shift)) == 0xff)
> +		return -1;
>  	return 0;
>  }
>
> -int kgdb8250_hook(void)
> +int
> +kgdb_hook_io(void)
>  {
>  	int retval;
>
> -	/*
> -	 * Set port and irq number.
> -	 */
> -	kgdb8250_irq = rs_table[kgdb8250_ttyS].irq;
> -	switch (rs_table[kgdb8250_ttyS].iotype) {
> +	/* Setup any serial port information we may need to */
> +#ifdef CONFIG_KGDB_SIMPLE_SERIAL
> +	/* We must look in the rs_table[]. */
> +	serial_from_rs_table = 1;
> +#endif
> +	/* If the user has overriden our definitions, or if we've only
> +	 * been told the ttyS to use, look at rs_table. */
> +	if (serial_from_rs_table) {
> +		/* The user has selected one of ttyS[0-3], which we pull
> +		 * from rs_table[].  If this doesn't exist, user error. */
> +		gdb_async_info.port = gdb_async_info.state->port =
> +		    rs_table[KGDB_PORT].port;
> +		gdb_async_info.line = gdb_async_info.state->irq =
> +		    rs_table[KGDB_PORT].irq;
> +		gdb_async_info.state->io_type = rs_table[KGDB_PORT].io_type;
> +		reg_shift = rs_table[KGDB_PORT].iomem_reg_shift;
> +	}
> +
> +	switch (gdb_async_info.state->io_type) {
>  	case SERIAL_IO_MEM:
> -		kgdb8250_port = (unsigned long)rs_table[kgdb8250_ttyS].membase;
> -		serial_inb = direct_inb;
> +		kgdb8250_port = (unsigned long)
> +		    rs_table[kgdb8250_ttyS].iomem_base;
>  		serial_outb = direct_outb;
> +		serial_inb = direct_inb;
>  		break;
> +	case SERIAL_IO_PORT:
>  	default:
> -		kgdb8250_port = rs_table[kgdb8250_ttyS].line;
> -		serial_inb = io_inb;
> +		kgdb8250_port = rs_table[kgdb8250_ttyS].port;
>  		serial_outb = io_outb;
> +		serial_inb = io_inb;
>  	}
>
> +#ifndef CONFIG_KGDB_SIMPLE_SERIAL
> +	/* The user has provided the IRQ and I/O location. */
> +	kgdb8250_port = gdb_async_info.port = gdb_async_info.state->port =
> +		CONFIG_KGDB_PORT;
> +	gdb_async_info.line = gdb_async_info.state->irq = CONFIG_KGDB_IRQ;
> +#endif
> +
>  #ifdef CONFIG_SERIAL_8250
> -	if ((retval = serial8250_release_irq(kgdb8250_irq)) < 0)
> -		return retval;
> +	if (serial8250_release_irq(gdb_async_info.line))
> +		return -1;
>  #endif
>
> -	if ((retval = kgdb8250_init(kgdb8250_ttyS, kgdb8250_baud)) < 0)
> -		return retval;
> +	if (kgdb8250_init() == -1)
> +		return -1;
>
> -	retval = request_irq(kgdb8250_irq, kgdb8250_interrupt, SA_INTERRUPT,
> -			     "GDB-stub", NULL);
> -	return retval;
> -}
> +	retval = request_irq(gdb_async_info.line, kgdb8250_interrupt,
> +			     SA_INTERRUPT, "GDB-stub", NULL);
> +	if (retval == 0)
> +		initialized = 1;
> +	else
> +		initialized = 0;
>
> -void kgdb8250_add_port(int i, struct uart_port *serial_req)
> -{
> -	rs_table[i].iotype = serial_req->iotype;
> -	rs_table[i].line = serial_req->line;
> -	rs_table[i].membase = serial_req->membase;
> -	rs_table[i].regshift = serial_req->regshift;
> +	return 0;
>  }
>
>  struct kgdb_serial kgdb8250_serial_driver = {
> -	.read_char = kgdb8250_read_char,
> -	.write_char = kgdb8250_write_char,
> -	.hook = kgdb8250_hook
> +	.read_char = kgdb_get_debug_char,
> +	.write_char = kgdb_put_debug_char,
> +	.hook = kgdb_hook_io,
>  };
>
> +void
> +kgdb8250_add_port(int i, struct uart_port *serial_req)
> +{
> +	rs_table[i].io_type = serial_req->iotype;
> +	rs_table[i].port = serial_req->line;
> +	rs_table[i].irq = serial_req->irq;
> +	rs_table[i].iomem_base = serial_req->membase;
> +	rs_table[i].iomem_reg_shift = serial_req->regshift;
> +
> +	/* We will want to look in the rs_table now. */
> +	serial_from_rs_table = 1;
> +}
> +
>  /*
>   * Syntax for this cmdline option is
>   * kgdb8250=ttyno,baudrate
>   */
>
> -static int __init kgdb8250_opt(char *str)
> +static int __init
> +kgdb8250_opt(char *str)
>  {
>  	if (*str < '0' || *str > '3')
>  		goto errout;
> @@ -382,7 +492,12 @@
>  	    kgdb8250_baud != 38400 && kgdb8250_baud != 57600 &&
>  	    kgdb8250_baud != 115200)
>  		goto errout;
> +
> +	/* Make the baud rate change happen. */
> +	gdb_async_info.state->custom_divisor = BASE_BAUD / kgdb8250_baud;
> +
>  	kgdb_serial = &kgdb8250_serial_driver;
> +
>  	return 1;
>
>        errout:
> diff -Nru a/include/linux/kgdb.h b/include/linux/kgdb.h
> --- a/include/linux/kgdb.h	Wed Feb 25 14:21:26 2004
> +++ b/include/linux/kgdb.h	Wed Feb 25 14:21:26 2004
> @@ -25,6 +25,8 @@
>  extern atomic_t kgdb_killed_or_detached;
>  extern atomic_t kgdb_might_be_resumed;
>
> +extern volatile int kgdb_connected;
> +
>  extern struct task_struct *kgdb_usethread, *kgdb_contthread;
>
>  enum kgdb_bptype {
> diff -Nru a/kernel/kgdb.c b/kernel/kgdb.c
> --- a/kernel/kgdb.c	Wed Feb 25 14:21:26 2004
> +++ b/kernel/kgdb.c	Wed Feb 25 14:21:26 2004
> @@ -63,7 +63,7 @@
>   * has connected to kgdb.
>   */
>  int kgdb_initialized = 0;
> -static volatile int kgdb_connected;
> +volatile int kgdb_connected;
>
>  /* If non-zero, wait for a gdb connection when kgdb_entry is called */
>  int kgdb_enter = 0;
> @@ -214,6 +214,7 @@
>  	do {
>  		/* wait around for the start character, ignore all other characters */
>  		while ((ch = (kgdb_serial->read_char() & 0x7f)) != '$') ;
> +		kgdb_connected = 1;
>  		checksum = 0;
>  		xmitcsum = -1;

-
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