*
* Copyright (c) 2002-2004, K A Fraser.
*
- * This file may be distributed separately from the Linux kernel, or
- * incorporated into other software packages, subject to the following license:
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
#include <linux/init.h>
#include <linux/console.h>
#include <linux/bootmem.h>
+#include <linux/sysrq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
-#include <asm-xen/xen-public/event_channel.h>
-#include <asm-xen/hypervisor.h>
-#include <asm-xen/evtchn.h>
-#include <asm-xen/ctrl_if.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/event_channel.h>
+#include <asm/hypervisor.h>
+#include <xen/evtchn.h>
+#include <xen/xencons.h>
/*
* Modes:
static enum { XC_OFF, XC_DEFAULT, XC_TTY, XC_SERIAL } xc_mode = XC_DEFAULT;
static int xc_num = -1;
+#ifdef CONFIG_MAGIC_SYSRQ
+static unsigned long sysrq_requested;
+extern int sysrq_enabled;
+#endif
+
static int __init xencons_setup(char *str)
{
- char *q;
- int n;
-
- if ( !strncmp(str, "ttyS", 4) )
- xc_mode = XC_SERIAL;
- else if ( !strncmp(str, "tty", 3) )
- xc_mode = XC_TTY;
- else if ( !strncmp(str, "off", 3) )
- xc_mode = XC_OFF;
-
- switch ( xc_mode )
- {
- case XC_SERIAL:
- n = simple_strtol( str+4, &q, 10 );
- if ( q > (str + 4) ) xc_num = n;
- break;
- case XC_TTY:
- n = simple_strtol( str+3, &q, 10 );
- if ( q > (str + 3) ) xc_num = n;
- break;
- default:
- break;
- }
-
- return 1;
+ char *q;
+ int n;
+
+ if (!strncmp(str, "ttyS", 4))
+ xc_mode = XC_SERIAL;
+ else if (!strncmp(str, "tty", 3))
+ xc_mode = XC_TTY;
+ else if (!strncmp(str, "off", 3))
+ xc_mode = XC_OFF;
+
+ switch (xc_mode) {
+ case XC_SERIAL:
+ n = simple_strtol(str+4, &q, 10);
+ if (q > (str + 4))
+ xc_num = n;
+ break;
+ case XC_TTY:
+ n = simple_strtol(str+3, &q, 10);
+ if (q > (str + 3))
+ xc_num = n;
+ break;
+ default:
+ break;
+ }
+
+ return 1;
}
__setup("xencons=", xencons_setup);
static int __init xencons_bufsz_setup(char *str)
{
- unsigned int goal;
- goal = simple_strtoul(str, NULL, 0);
- while ( wbuf_size < goal )
- wbuf_size <<= 1;
- return 1;
+ unsigned int goal;
+ goal = simple_strtoul(str, NULL, 0);
+ if (goal) {
+ goal = roundup_pow_of_two(goal);
+ if (wbuf_size < goal)
+ wbuf_size = goal;
+ }
+ return 1;
}
__setup("xencons_bufsz=", xencons_bufsz_setup);
/* This lock protects accesses to the common transmit buffer. */
-static spinlock_t xencons_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(xencons_lock);
/* Common transmit-kick routine. */
static void __xencons_tx_flush(void);
-/* This task is used to defer sending console data until there is space. */
-static void xencons_tx_flush_task_routine(void *data);
-
-static DECLARE_TQUEUE(xencons_tx_flush_task,
- xencons_tx_flush_task_routine,
- NULL);
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
static struct tty_driver *xencons_driver;
-#else
-static struct tty_driver xencons_driver;
-#endif
-
/******************** Kernel console driver ********************************/
-static void kcons_write(
- struct console *c, const char *s, unsigned int count)
+static void kcons_write(struct console *c, const char *s, unsigned int count)
{
- int i;
- unsigned long flags;
-
- spin_lock_irqsave(&xencons_lock, flags);
-
- for ( i = 0; i < count; i++ )
- {
- if ( (wp - wc) >= (wbuf_size - 1) )
- break;
- if ( (wbuf[WBUF_MASK(wp++)] = s[i]) == '\n' )
- wbuf[WBUF_MASK(wp++)] = '\r';
- }
-
- __xencons_tx_flush();
-
- spin_unlock_irqrestore(&xencons_lock, flags);
+ int i = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&xencons_lock, flags);
+
+ while (i < count) {
+ for (; i < count; i++) {
+ if ((wp - wc) >= (wbuf_size - 1))
+ break;
+ if ((wbuf[WBUF_MASK(wp++)] = s[i]) == '\n')
+ wbuf[WBUF_MASK(wp++)] = '\r';
+ }
+
+ __xencons_tx_flush();
+ }
+
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
-static void kcons_write_dom0(
- struct console *c, const char *s, unsigned int count)
+static void kcons_write_dom0(struct console *c, const char *s, unsigned int count)
{
- int rc;
-
- while ( (count > 0) &&
- ((rc = HYPERVISOR_console_io(
- CONSOLEIO_write, count, (char *)s)) > 0) )
- {
- count -= rc;
- s += rc;
- }
+
+ while (count > 0) {
+ int rc;
+ rc = HYPERVISOR_console_io( CONSOLEIO_write, count, (char *)s);
+ if (rc <= 0)
+ break;
+ count -= rc;
+ s += rc;
+ }
}
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
static struct tty_driver *kcons_device(struct console *c, int *index)
{
- *index = c->index;
- return xencons_driver;
-}
-#else
-static kdev_t kcons_device(struct console *c)
-{
- return MKDEV(TTY_MAJOR, (xc_mode == XC_SERIAL) ? 64 : 1);
+ *index = 0;
+ return xencons_driver;
}
-#endif
static struct console kcons_info = {
- device: kcons_device,
- flags: CON_PRINTBUFFER,
- index: -1
+ .device = kcons_device,
+ .flags = CON_PRINTBUFFER | CON_ENABLED,
+ .index = -1,
};
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
#define __RETCODE 0
static int __init xen_console_init(void)
-#else
-#define __RETCODE
-void xen_console_init(void)
-#endif
{
- if ( xen_start_info.flags & SIF_INITDOMAIN )
- {
- if ( xc_mode == XC_DEFAULT )
- xc_mode = XC_SERIAL;
- kcons_info.write = kcons_write_dom0;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- if ( xc_mode == XC_SERIAL )
- kcons_info.flags |= CON_ENABLED;
-#endif
- }
- else
- {
- if ( xc_mode == XC_DEFAULT )
- xc_mode = XC_TTY;
- kcons_info.write = kcons_write;
- }
-
- switch ( xc_mode )
- {
- case XC_SERIAL:
- strcpy(kcons_info.name, "ttyS");
- if ( xc_num == -1 ) xc_num = 0;
- break;
-
- case XC_TTY:
- strcpy(kcons_info.name, "tty");
- if ( xc_num == -1 ) xc_num = 1;
- break;
-
- default:
- return __RETCODE;
- }
-
- wbuf = alloc_bootmem(wbuf_size);
-
- register_console(&kcons_info);
-
- return __RETCODE;
+ if (!is_running_on_xen())
+ return __RETCODE;
+
+ if (xen_start_info->flags & SIF_INITDOMAIN) {
+ if (xc_mode == XC_DEFAULT)
+ xc_mode = XC_SERIAL;
+ kcons_info.write = kcons_write_dom0;
+ } else {
+ if (xc_mode == XC_DEFAULT)
+ xc_mode = XC_TTY;
+ kcons_info.write = kcons_write;
+ }
+
+ switch (xc_mode) {
+ case XC_SERIAL:
+ strcpy(kcons_info.name, "ttyS");
+ if (xc_num == -1)
+ xc_num = 0;
+ break;
+
+ case XC_TTY:
+ strcpy(kcons_info.name, "tty");
+ if (xc_num == -1)
+ xc_num = 1;
+ break;
+
+ default:
+ return __RETCODE;
+ }
+
+ wbuf = alloc_bootmem(wbuf_size);
+
+ register_console(&kcons_info);
+
+ return __RETCODE;
}
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
console_initcall(xen_console_init);
-#endif
/*** Useful function for console debugging -- goes straight to Xen. ***/
asmlinkage int xprintk(const char *fmt, ...)
{
- va_list args;
- int printk_len;
- static char printk_buf[1024];
-
- /* Emit the output into the temporary buffer */
- va_start(args, fmt);
- printk_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args);
- va_end(args);
-
- /* Send the processed output directly to Xen. */
- kcons_write_dom0(NULL, printk_buf, printk_len);
-
- return 0;
+ va_list args;
+ int printk_len;
+ static char printk_buf[1024];
+
+ /* Emit the output into the temporary buffer */
+ va_start(args, fmt);
+ printk_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args);
+ va_end(args);
+
+ /* Send the processed output directly to Xen. */
+ kcons_write_dom0(NULL, printk_buf, printk_len);
+
+ return 0;
}
/*** Forcibly flush console data before dying. ***/
void xencons_force_flush(void)
{
- ctrl_msg_t msg;
- int sz;
-
- /* Emergency console is synchronous, so there's nothing to flush. */
- if ( xen_start_info.flags & SIF_INITDOMAIN )
- return;
-
- /*
- * We use dangerous control-interface functions that require a quiescent
- * system and no interrupts. Try to ensure this with a global cli().
- */
- local_irq_disable(); /* XXXsmp */
-
- /* Spin until console data is flushed through to the domain controller. */
- while ( (wc != wp) && !ctrl_if_transmitter_empty() )
- {
- /* Interrupts are disabled -- we must manually reap responses. */
- ctrl_if_discard_responses();
-
- if ( (sz = wp - wc) == 0 )
- continue;
- if ( sz > sizeof(msg.msg) )
- sz = sizeof(msg.msg);
- if ( sz > (wbuf_size - WBUF_MASK(wc)) )
- sz = wbuf_size - WBUF_MASK(wc);
-
- msg.type = CMSG_CONSOLE;
- msg.subtype = CMSG_CONSOLE_DATA;
- msg.length = sz;
- memcpy(msg.msg, &wbuf[WBUF_MASK(wc)], sz);
-
- if ( ctrl_if_send_message_noblock(&msg, NULL, 0) == 0 )
- wc += sz;
- }
+ int sz;
+
+ /* Emergency console is synchronous, so there's nothing to flush. */
+ if (xen_start_info->flags & SIF_INITDOMAIN)
+ return;
+
+ /* Spin until console data is flushed through to the daemon. */
+ while (wc != wp) {
+ int sent = 0;
+ if ((sz = wp - wc) == 0)
+ continue;
+ sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
+ if (sent > 0)
+ wc += sent;
+ }
}
/******************** User-space console driver (/dev/console) ************/
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
#define DRV(_d) (_d)
-#define TTY_INDEX(_tty) ((_tty)->index)
-#else
-static int xencons_refcount;
-static struct tty_struct *xencons_table[MAX_NR_CONSOLES];
-#define DRV(_d) (&(_d))
-#define TTY_INDEX(_tty) (MINOR((_tty)->device) - xencons_driver.minor_start)
-#endif
+#define DUMMY_TTY(_tty) ((xc_mode != XC_SERIAL) && \
+ ((_tty)->index != (xc_num - 1)))
static struct termios *xencons_termios[MAX_NR_CONSOLES];
static struct termios *xencons_termios_locked[MAX_NR_CONSOLES];
static int xencons_priv_irq;
static char x_char;
-/* Non-privileged receive callback. */
-static void xencons_rx(ctrl_msg_t *msg, unsigned long id)
+void xencons_rx(char *buf, unsigned len, struct pt_regs *regs)
{
- int i;
- unsigned long flags;
-
- spin_lock_irqsave(&xencons_lock, flags);
- if ( xencons_tty != NULL )
- {
- for ( i = 0; i < msg->length; i++ )
- tty_insert_flip_char(xencons_tty, msg->msg[i], 0);
- tty_flip_buffer_push(xencons_tty);
- }
- spin_unlock_irqrestore(&xencons_lock, flags);
-
- msg->length = 0;
- ctrl_if_send_response(msg);
+ int i;
+ unsigned long flags;
+
+ spin_lock_irqsave(&xencons_lock, flags);
+ if (xencons_tty == NULL)
+ goto out;
+
+ for (i = 0; i < len; i++) {
+#ifdef CONFIG_MAGIC_SYSRQ
+ if (sysrq_enabled) {
+ if (buf[i] == '\x0f') { /* ^O */
+ sysrq_requested = jiffies;
+ continue; /* don't print the sysrq key */
+ } else if (sysrq_requested) {
+ unsigned long sysrq_timeout =
+ sysrq_requested + HZ*2;
+ sysrq_requested = 0;
+ if (time_before(jiffies, sysrq_timeout)) {
+ spin_unlock_irqrestore(
+ &xencons_lock, flags);
+ handle_sysrq(
+ buf[i], regs, xencons_tty);
+ spin_lock_irqsave(
+ &xencons_lock, flags);
+ continue;
+ }
+ }
+ }
+#endif
+ tty_insert_flip_char(xencons_tty, buf[i], 0);
+ }
+ tty_flip_buffer_push(xencons_tty);
+
+ out:
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
-/* Privileged and non-privileged transmit worker. */
static void __xencons_tx_flush(void)
{
- int sz, work_done = 0;
- ctrl_msg_t msg;
-
- if ( xen_start_info.flags & SIF_INITDOMAIN )
- {
- if ( x_char )
- {
- kcons_write_dom0(NULL, &x_char, 1);
- x_char = 0;
- work_done = 1;
- }
-
- while ( wc != wp )
- {
- sz = wp - wc;
- if ( sz > (wbuf_size - WBUF_MASK(wc)) )
- sz = wbuf_size - WBUF_MASK(wc);
- kcons_write_dom0(NULL, &wbuf[WBUF_MASK(wc)], sz);
- wc += sz;
- work_done = 1;
- }
- }
- else
- {
- while ( x_char )
- {
- msg.type = CMSG_CONSOLE;
- msg.subtype = CMSG_CONSOLE_DATA;
- msg.length = 1;
- msg.msg[0] = x_char;
-
- if ( ctrl_if_send_message_noblock(&msg, NULL, 0) == 0 )
- x_char = 0;
- else if ( ctrl_if_enqueue_space_callback(&xencons_tx_flush_task) )
- break;
-
- work_done = 1;
- }
-
- while ( wc != wp )
- {
- sz = wp - wc;
- if ( sz > sizeof(msg.msg) )
- sz = sizeof(msg.msg);
- if ( sz > (wbuf_size - WBUF_MASK(wc)) )
- sz = wbuf_size - WBUF_MASK(wc);
-
- msg.type = CMSG_CONSOLE;
- msg.subtype = CMSG_CONSOLE_DATA;
- msg.length = sz;
- memcpy(msg.msg, &wbuf[WBUF_MASK(wc)], sz);
-
- if ( ctrl_if_send_message_noblock(&msg, NULL, 0) == 0 )
- wc += sz;
- else if ( ctrl_if_enqueue_space_callback(&xencons_tx_flush_task) )
- break;
-
- work_done = 1;
- }
- }
-
- if ( work_done && (xencons_tty != NULL) )
- {
- wake_up_interruptible(&xencons_tty->write_wait);
- if ( (xencons_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- (xencons_tty->ldisc.write_wakeup != NULL) )
- (xencons_tty->ldisc.write_wakeup)(xencons_tty);
- }
+ int sent, sz, work_done = 0;
+
+ if (x_char) {
+ if (xen_start_info->flags & SIF_INITDOMAIN)
+ kcons_write_dom0(NULL, &x_char, 1);
+ else
+ while (x_char)
+ if (xencons_ring_send(&x_char, 1) == 1)
+ break;
+ x_char = 0;
+ work_done = 1;
+ }
+
+ while (wc != wp) {
+ sz = wp - wc;
+ if (sz > (wbuf_size - WBUF_MASK(wc)))
+ sz = wbuf_size - WBUF_MASK(wc);
+ if (xen_start_info->flags & SIF_INITDOMAIN) {
+ kcons_write_dom0(NULL, &wbuf[WBUF_MASK(wc)], sz);
+ wc += sz;
+ } else {
+ sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
+ if (sent == 0)
+ break;
+ wc += sent;
+ }
+ work_done = 1;
+ }
+
+ if (work_done && (xencons_tty != NULL)) {
+ wake_up_interruptible(&xencons_tty->write_wait);
+ if ((xencons_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ (xencons_tty->ldisc.write_wakeup != NULL))
+ (xencons_tty->ldisc.write_wakeup)(xencons_tty);
+ }
}
-/* Non-privileged transmit kicker. */
-static void xencons_tx_flush_task_routine(void *data)
+void xencons_tx(void)
{
- unsigned long flags;
- spin_lock_irqsave(&xencons_lock, flags);
- __xencons_tx_flush();
- spin_unlock_irqrestore(&xencons_lock, flags);
+ unsigned long flags;
+
+ spin_lock_irqsave(&xencons_lock, flags);
+ __xencons_tx_flush();
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
/* Privileged receive callback and transmit kicker. */
static irqreturn_t xencons_priv_interrupt(int irq, void *dev_id,
- struct pt_regs *regs)
+ struct pt_regs *regs)
{
- static char rbuf[16];
- int i, l;
- unsigned long flags;
+ static char rbuf[16];
+ int l;
- spin_lock_irqsave(&xencons_lock, flags);
+ while ((l = HYPERVISOR_console_io(CONSOLEIO_read, 16, rbuf)) > 0)
+ xencons_rx(rbuf, l, regs);
- if ( xencons_tty != NULL )
- {
- /* Receive work. */
- while ( (l = HYPERVISOR_console_io(CONSOLEIO_read, 16, rbuf)) > 0 )
- for ( i = 0; i < l; i++ )
- tty_insert_flip_char(xencons_tty, rbuf[i], 0);
- if ( xencons_tty->flip.count != 0 )
- tty_flip_buffer_push(xencons_tty);
- }
+ xencons_tx();
- /* Transmit work. */
- __xencons_tx_flush();
-
- spin_unlock_irqrestore(&xencons_lock, flags);
-
- return IRQ_HANDLED;
+ return IRQ_HANDLED;
}
static int xencons_write_room(struct tty_struct *tty)
{
- return wbuf_size - (wp - wc);
+ return wbuf_size - (wp - wc);
}
static int xencons_chars_in_buffer(struct tty_struct *tty)
{
- return wp - wc;
+ return wp - wc;
}
static void xencons_send_xchar(struct tty_struct *tty, char ch)
{
- unsigned long flags;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return;
+ if (DUMMY_TTY(tty))
+ return;
- spin_lock_irqsave(&xencons_lock, flags);
- x_char = ch;
- __xencons_tx_flush();
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
+ x_char = ch;
+ __xencons_tx_flush();
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
static void xencons_throttle(struct tty_struct *tty)
{
- if ( TTY_INDEX(tty) != 0 )
- return;
+ if (DUMMY_TTY(tty))
+ return;
- if ( I_IXOFF(tty) )
- xencons_send_xchar(tty, STOP_CHAR(tty));
+ if (I_IXOFF(tty))
+ xencons_send_xchar(tty, STOP_CHAR(tty));
}
static void xencons_unthrottle(struct tty_struct *tty)
{
- if ( TTY_INDEX(tty) != 0 )
- return;
-
- if ( I_IXOFF(tty) )
- {
- if ( x_char != 0 )
- x_char = 0;
- else
- xencons_send_xchar(tty, START_CHAR(tty));
- }
+ if (DUMMY_TTY(tty))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (x_char != 0)
+ x_char = 0;
+ else
+ xencons_send_xchar(tty, START_CHAR(tty));
+ }
}
static void xencons_flush_buffer(struct tty_struct *tty)
{
- unsigned long flags;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return;
+ if (DUMMY_TTY(tty))
+ return;
- spin_lock_irqsave(&xencons_lock, flags);
- wc = wp = 0;
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
+ wc = wp = 0;
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
static inline int __xencons_put_char(int ch)
{
- char _ch = (char)ch;
- if ( (wp - wc) == wbuf_size )
- return 0;
- wbuf[WBUF_MASK(wp++)] = _ch;
- return 1;
+ char _ch = (char)ch;
+ if ((wp - wc) == wbuf_size)
+ return 0;
+ wbuf[WBUF_MASK(wp++)] = _ch;
+ return 1;
}
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
static int xencons_write(
- struct tty_struct *tty,
- const unsigned char *buf,
- int count)
+ struct tty_struct *tty,
+ const unsigned char *buf,
+ int count)
{
- int i;
- unsigned long flags;
+ int i;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return count;
+ if (DUMMY_TTY(tty))
+ return count;
- spin_lock_irqsave(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
- for ( i = 0; i < count; i++ )
- if ( !__xencons_put_char(buf[i]) )
- break;
+ for (i = 0; i < count; i++)
+ if (!__xencons_put_char(buf[i]))
+ break;
- if ( i != 0 )
- __xencons_tx_flush();
+ if (i != 0)
+ __xencons_tx_flush();
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_unlock_irqrestore(&xencons_lock, flags);
- return i;
+ return i;
}
-#else
-static int xencons_write(
- struct tty_struct *tty,
- int from_user,
- const u_char *buf,
- int count)
-{
- int i;
- unsigned long flags;
-
- if ( from_user && verify_area(VERIFY_READ, buf, count) )
- return -EINVAL;
-
- if ( TTY_INDEX(tty) != 0 )
- return count;
-
- spin_lock_irqsave(&xencons_lock, flags);
-
- for ( i = 0; i < count; i++ )
- {
- char ch;
- if ( from_user )
- __get_user(ch, buf + i);
- else
- ch = buf[i];
- if ( !__xencons_put_char(ch) )
- break;
- }
-
- if ( i != 0 )
- __xencons_tx_flush();
-
- spin_unlock_irqrestore(&xencons_lock, flags);
-
- return i;
-}
-#endif
static void xencons_put_char(struct tty_struct *tty, u_char ch)
{
- unsigned long flags;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return;
+ if (DUMMY_TTY(tty))
+ return;
- spin_lock_irqsave(&xencons_lock, flags);
- (void)__xencons_put_char(ch);
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
+ (void)__xencons_put_char(ch);
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
static void xencons_flush_chars(struct tty_struct *tty)
{
- unsigned long flags;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return;
+ if (DUMMY_TTY(tty))
+ return;
- spin_lock_irqsave(&xencons_lock, flags);
- __xencons_tx_flush();
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
+ __xencons_tx_flush();
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
static void xencons_wait_until_sent(struct tty_struct *tty, int timeout)
{
- unsigned long orig_jiffies = jiffies;
-
- if ( TTY_INDEX(tty) != 0 )
- return;
-
- while ( DRV(tty->driver)->chars_in_buffer(tty) )
- {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(1);
- if ( signal_pending(current) )
- break;
- if ( (timeout != 0) && time_after(jiffies, orig_jiffies + timeout) )
- break;
- }
-
- set_current_state(TASK_RUNNING);
+ unsigned long orig_jiffies = jiffies;
+
+ if (DUMMY_TTY(tty))
+ return;
+
+ while (DRV(tty->driver)->chars_in_buffer(tty)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(1);
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+
+ set_current_state(TASK_RUNNING);
}
static int xencons_open(struct tty_struct *tty, struct file *filp)
{
- unsigned long flags;
+ unsigned long flags;
- if ( TTY_INDEX(tty) != 0 )
- return 0;
+ if (DUMMY_TTY(tty))
+ return 0;
- spin_lock_irqsave(&xencons_lock, flags);
- tty->driver_data = NULL;
- if ( xencons_tty == NULL )
- xencons_tty = tty;
- __xencons_tx_flush();
- spin_unlock_irqrestore(&xencons_lock, flags);
+ spin_lock_irqsave(&xencons_lock, flags);
+ tty->driver_data = NULL;
+ if (xencons_tty == NULL)
+ xencons_tty = tty;
+ __xencons_tx_flush();
+ spin_unlock_irqrestore(&xencons_lock, flags);
- return 0;
+ return 0;
}
static void xencons_close(struct tty_struct *tty, struct file *filp)
{
- unsigned long flags;
-
- if ( TTY_INDEX(tty) != 0 )
- return;
-
- if ( tty->count == 1 )
- {
- tty->closing = 1;
- tty_wait_until_sent(tty, 0);
- if ( DRV(tty->driver)->flush_buffer != NULL )
- DRV(tty->driver)->flush_buffer(tty);
- if ( tty->ldisc.flush_buffer != NULL )
- tty->ldisc.flush_buffer(tty);
- tty->closing = 0;
- spin_lock_irqsave(&xencons_lock, flags);
- xencons_tty = NULL;
- spin_unlock_irqrestore(&xencons_lock, flags);
- }
+ unsigned long flags;
+
+ if (DUMMY_TTY(tty))
+ return;
+
+ mutex_lock(&tty_mutex);
+
+ if (tty->count != 1) {
+ mutex_unlock(&tty_mutex);
+ return;
+ }
+
+ /* Prevent other threads from re-opening this tty. */
+ set_bit(TTY_CLOSING, &tty->flags);
+ mutex_unlock(&tty_mutex);
+
+ tty->closing = 1;
+ tty_wait_until_sent(tty, 0);
+ if (DRV(tty->driver)->flush_buffer != NULL)
+ DRV(tty->driver)->flush_buffer(tty);
+ if (tty->ldisc.flush_buffer != NULL)
+ tty->ldisc.flush_buffer(tty);
+ tty->closing = 0;
+ spin_lock_irqsave(&xencons_lock, flags);
+ xencons_tty = NULL;
+ spin_unlock_irqrestore(&xencons_lock, flags);
}
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
static struct tty_operations xencons_ops = {
- .open = xencons_open,
- .close = xencons_close,
- .write = xencons_write,
- .write_room = xencons_write_room,
- .put_char = xencons_put_char,
- .flush_chars = xencons_flush_chars,
- .chars_in_buffer = xencons_chars_in_buffer,
- .send_xchar = xencons_send_xchar,
- .flush_buffer = xencons_flush_buffer,
- .throttle = xencons_throttle,
- .unthrottle = xencons_unthrottle,
- .wait_until_sent = xencons_wait_until_sent,
+ .open = xencons_open,
+ .close = xencons_close,
+ .write = xencons_write,
+ .write_room = xencons_write_room,
+ .put_char = xencons_put_char,
+ .flush_chars = xencons_flush_chars,
+ .chars_in_buffer = xencons_chars_in_buffer,
+ .send_xchar = xencons_send_xchar,
+ .flush_buffer = xencons_flush_buffer,
+ .throttle = xencons_throttle,
+ .unthrottle = xencons_unthrottle,
+ .wait_until_sent = xencons_wait_until_sent,
};
-#ifdef CONFIG_XEN_PRIVILEGED_GUEST
-static const char *xennullcon_startup(void)
-{
- return NULL;
-}
-
-static int xennullcon_dummy(void)
-{
- return 0;
-}
-
-#define DUMMY (void *)xennullcon_dummy
-
-/*
- * The console `switch' structure for the dummy console
- *
- * Most of the operations are dummies.
- */
-
-const struct consw xennull_con = {
- .owner = THIS_MODULE,
- .con_startup = xennullcon_startup,
- .con_init = DUMMY,
- .con_deinit = DUMMY,
- .con_clear = DUMMY,
- .con_putc = DUMMY,
- .con_putcs = DUMMY,
- .con_cursor = DUMMY,
- .con_scroll = DUMMY,
- .con_bmove = DUMMY,
- .con_switch = DUMMY,
- .con_blank = DUMMY,
- .con_font_set = DUMMY,
- .con_font_get = DUMMY,
- .con_font_default = DUMMY,
- .con_font_copy = DUMMY,
- .con_set_palette = DUMMY,
- .con_scrolldelta = DUMMY,
-};
-#endif
-#endif
-
static int __init xencons_init(void)
{
- int rc;
-
- if ( xc_mode == XC_OFF )
- return 0;
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- xencons_driver = alloc_tty_driver((xc_mode == XC_SERIAL) ?
- 1 : MAX_NR_CONSOLES);
- if ( xencons_driver == NULL )
- return -ENOMEM;
-#else
- memset(&xencons_driver, 0, sizeof(struct tty_driver));
- xencons_driver.magic = TTY_DRIVER_MAGIC;
- xencons_driver.refcount = &xencons_refcount;
- xencons_driver.table = xencons_table;
- xencons_driver.num = (xc_mode == XC_SERIAL) ? 1 : MAX_NR_CONSOLES;
-#endif
-
- DRV(xencons_driver)->major = TTY_MAJOR;
- DRV(xencons_driver)->type = TTY_DRIVER_TYPE_SERIAL;
- DRV(xencons_driver)->subtype = SERIAL_TYPE_NORMAL;
- DRV(xencons_driver)->init_termios = tty_std_termios;
- DRV(xencons_driver)->flags =
- TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_NO_DEVFS;
- DRV(xencons_driver)->termios = xencons_termios;
- DRV(xencons_driver)->termios_locked = xencons_termios_locked;
-
- if ( xc_mode == XC_SERIAL )
- {
- DRV(xencons_driver)->name = "ttyS";
- DRV(xencons_driver)->minor_start = 64 + xc_num;
- DRV(xencons_driver)->name_base = 0 + xc_num;
- }
- else
- {
- DRV(xencons_driver)->name = "tty";
- DRV(xencons_driver)->minor_start = xc_num;
- DRV(xencons_driver)->name_base = xc_num;
- }
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- tty_set_operations(xencons_driver, &xencons_ops);
-#else
- xencons_driver.open = xencons_open;
- xencons_driver.close = xencons_close;
- xencons_driver.write = xencons_write;
- xencons_driver.write_room = xencons_write_room;
- xencons_driver.put_char = xencons_put_char;
- xencons_driver.flush_chars = xencons_flush_chars;
- xencons_driver.chars_in_buffer = xencons_chars_in_buffer;
- xencons_driver.send_xchar = xencons_send_xchar;
- xencons_driver.flush_buffer = xencons_flush_buffer;
- xencons_driver.throttle = xencons_throttle;
- xencons_driver.unthrottle = xencons_unthrottle;
- xencons_driver.wait_until_sent = xencons_wait_until_sent;
-#endif
-
- if ( (rc = tty_register_driver(DRV(xencons_driver))) != 0 )
- {
- printk("WARNING: Failed to register Xen virtual "
- "console driver as '%s%d'\n",
- DRV(xencons_driver)->name, DRV(xencons_driver)->name_base);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- put_tty_driver(xencons_driver);
- xencons_driver = NULL;
-#endif
- return rc;
- }
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- tty_register_device(xencons_driver, 0, NULL);
-#endif
-
- if ( xen_start_info.flags & SIF_INITDOMAIN )
- {
- xencons_priv_irq = bind_virq_to_irq(VIRQ_CONSOLE);
- (void)request_irq(xencons_priv_irq,
- xencons_priv_interrupt, 0, "console", NULL);
- }
- else
- {
- (void)ctrl_if_register_receiver(CMSG_CONSOLE, xencons_rx, 0);
- }
-
- printk("Xen virtual console successfully installed as %s%d\n",
- DRV(xencons_driver)->name,
- DRV(xencons_driver)->name_base );
-
- return 0;
+ int rc;
+
+ if (!is_running_on_xen())
+ return -ENODEV;
+
+ if (xc_mode == XC_OFF)
+ return 0;
+
+ xencons_ring_init();
+
+ xencons_driver = alloc_tty_driver((xc_mode == XC_SERIAL) ?
+ 1 : MAX_NR_CONSOLES);
+ if (xencons_driver == NULL)
+ return -ENOMEM;
+
+ DRV(xencons_driver)->name = "xencons";
+ DRV(xencons_driver)->major = TTY_MAJOR;
+ DRV(xencons_driver)->type = TTY_DRIVER_TYPE_SERIAL;
+ DRV(xencons_driver)->subtype = SERIAL_TYPE_NORMAL;
+ DRV(xencons_driver)->init_termios = tty_std_termios;
+ DRV(xencons_driver)->flags =
+ TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_RESET_TERMIOS;
+ DRV(xencons_driver)->termios = xencons_termios;
+ DRV(xencons_driver)->termios_locked = xencons_termios_locked;
+
+ if (xc_mode == XC_SERIAL) {
+ DRV(xencons_driver)->name = "ttyS";
+ DRV(xencons_driver)->minor_start = 64 + xc_num;
+ DRV(xencons_driver)->name_base = 0 + xc_num;
+ } else {
+ DRV(xencons_driver)->name = "tty";
+ DRV(xencons_driver)->minor_start = 1;
+ DRV(xencons_driver)->name_base = 1;
+ }
+
+ tty_set_operations(xencons_driver, &xencons_ops);
+
+ if ((rc = tty_register_driver(DRV(xencons_driver))) != 0) {
+ printk("WARNING: Failed to register Xen virtual "
+ "console driver as '%s%d'\n",
+ DRV(xencons_driver)->name,
+ DRV(xencons_driver)->name_base);
+ put_tty_driver(xencons_driver);
+ xencons_driver = NULL;
+ return rc;
+ }
+
+ if (xen_start_info->flags & SIF_INITDOMAIN) {
+ xencons_priv_irq = bind_virq_to_irqhandler(
+ VIRQ_CONSOLE,
+ 0,
+ xencons_priv_interrupt,
+ 0,
+ "console",
+ NULL);
+ BUG_ON(xencons_priv_irq < 0);
+ }
+
+ printk("Xen virtual console successfully installed as %s%d\n",
+ DRV(xencons_driver)->name, xc_num);
+
+ return 0;
}
module_init(xencons_init);
+
+MODULE_LICENSE("Dual BSD/GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff