1 files changed, 681 insertions, 0 deletions

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
new file mode 100644
index 000000000000..6924f273ced9
--- /dev/null
+++ b/arch/um/drivers/line.c
@@ -0,0 +1,681 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/slab.h"
+#include "linux/list.h"
+#include "linux/kd.h"
+#include "linux/interrupt.h"
+#include "linux/devfs_fs_kernel.h"
+#include "asm/uaccess.h"
+#include "chan_kern.h"
+#include "irq_user.h"
+#include "line.h"
+#include "kern.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "os.h"
+#include "irq_kern.h"
+
+#define LINE_BUFSIZE 4096
+
+static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+	struct tty_struct *tty = data;
+	struct line *line = tty->driver_data;
+
+	if (line)
+		chan_interrupt(&line->chan_list, &line->task, tty, irq);
+	return IRQ_HANDLED;
+}
+
+static void line_timer_cb(void *arg)
+{
+	struct tty_struct *tty = arg;
+	struct line *line = tty->driver_data;
+
+	line_interrupt(line->driver->read_irq, arg, NULL);
+}
+
+static int write_room(struct line *dev)
+{
+	int n;
+
+	if (dev->buffer == NULL)
+		return (LINE_BUFSIZE - 1);
+
+	n = dev->head - dev->tail;
+	if (n <= 0)
+		n = LINE_BUFSIZE + n;
+	return (n - 1);
+}
+
+static int buffer_data(struct line *line, const char *buf, int len)
+{
+	int end, room;
+
+	if(line->buffer == NULL){
+		line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
+		if (line->buffer == NULL) {
+			printk("buffer_data - atomic allocation failed\n");
+			return(0);
+		}
+		line->head = line->buffer;
+		line->tail = line->buffer;
+	}
+
+	room = write_room(line);
+	len = (len > room) ? room : len;
+
+	end = line->buffer + LINE_BUFSIZE - line->tail;
+	if(len < end){
+		memcpy(line->tail, buf, len);
+		line->tail += len;
+	}
+	else {
+		memcpy(line->tail, buf, end);
+		buf += end;
+		memcpy(line->buffer, buf, len - end);
+		line->tail = line->buffer + len - end;
+	}
+
+	return(len);
+}
+
+static int flush_buffer(struct line *line)
+{
+	int n, count;
+
+	if ((line->buffer == NULL) || (line->head == line->tail))
+		return(1);
+
+	if (line->tail < line->head) {
+		count = line->buffer + LINE_BUFSIZE - line->head;
+		n = write_chan(&line->chan_list, line->head, count,
+			       line->driver->write_irq);
+		if (n < 0)
+			return(n);
+		if (n == count)
+			line->head = line->buffer;
+		else {
+			line->head += n;
+			return(0);
+		}
+	}
+
+	count = line->tail - line->head;
+	n = write_chan(&line->chan_list, line->head, count, 
+		       line->driver->write_irq);
+	if(n < 0) return(n);
+
+	line->head += n;
+	return(line->head == line->tail);
+}
+
+int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
+{
+	struct line *line = tty->driver_data;
+	unsigned long flags;
+	int n, err, ret = 0;
+
+	if(tty->stopped) return 0;
+
+	down(&line->sem);
+	if(line->head != line->tail){
+		local_irq_save(flags);
+		ret = buffer_data(line, buf, len);
+		err = flush_buffer(line);
+		local_irq_restore(flags);
+		if(err <= 0 && (err != -EAGAIN || !ret))
+			ret = err;
+	}
+	else {
+		n = write_chan(&line->chan_list, buf, len, 
+			       line->driver->write_irq);
+		if(n < 0){
+			ret = n;
+			goto out_up;
+		}
+
+		len -= n;
+		ret += n;
+		if(len > 0)
+			ret += buffer_data(line, buf + n, len);
+	}
+ out_up:
+	up(&line->sem);
+	return(ret);
+}
+
+void line_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	line_write(tty, &ch, sizeof(ch));
+}
+
+void line_set_termios(struct tty_struct *tty, struct termios * old)
+{
+	/* nothing */
+}
+
+int line_chars_in_buffer(struct tty_struct *tty)
+{
+	return 0;
+}
+
+static struct {
+	int  cmd;
+	char *level;
+	char *name;
+} tty_ioctls[] = {
+	/* don't print these, they flood the log ... */
+	{ TCGETS,      NULL,       "TCGETS"      },
+        { TCSETS,      NULL,       "TCSETS"      },
+        { TCSETSW,     NULL,       "TCSETSW"     },
+        { TCFLSH,      NULL,       "TCFLSH"      },
+        { TCSBRK,      NULL,       "TCSBRK"      },
+
+	/* general tty stuff */
+        { TCSETSF,     KERN_DEBUG, "TCSETSF"     },
+        { TCGETA,      KERN_DEBUG, "TCGETA"      },
+        { TIOCMGET,    KERN_DEBUG, "TIOCMGET"    },
+        { TCSBRKP,     KERN_DEBUG, "TCSBRKP"     },
+        { TIOCMSET,    KERN_DEBUG, "TIOCMSET"    },
+
+	/* linux-specific ones */
+	{ TIOCLINUX,   KERN_INFO,  "TIOCLINUX"   },
+	{ KDGKBMODE,   KERN_INFO,  "KDGKBMODE"   },
+	{ KDGKBTYPE,   KERN_INFO,  "KDGKBTYPE"   },
+	{ KDSIGACCEPT, KERN_INFO,  "KDSIGACCEPT" },
+};
+
+int line_ioctl(struct tty_struct *tty, struct file * file,
+	       unsigned int cmd, unsigned long arg)
+{
+	int ret;
+	int i;
+
+	ret = 0;
+	switch(cmd) {
+#ifdef TIOCGETP
+	case TIOCGETP:
+	case TIOCSETP:
+	case TIOCSETN:
+#endif
+#ifdef TIOCGETC
+	case TIOCGETC:
+	case TIOCSETC:
+#endif
+#ifdef TIOCGLTC
+	case TIOCGLTC:
+	case TIOCSLTC:
+#endif
+	case TCGETS:
+	case TCSETSF:
+	case TCSETSW:
+	case TCSETS:
+	case TCGETA:
+	case TCSETAF:
+	case TCSETAW:
+	case TCSETA:
+	case TCXONC:
+	case TCFLSH:
+	case TIOCOUTQ:
+	case TIOCINQ:
+	case TIOCGLCKTRMIOS:
+	case TIOCSLCKTRMIOS:
+	case TIOCPKT:
+	case TIOCGSOFTCAR:
+	case TIOCSSOFTCAR:
+		return -ENOIOCTLCMD;
+#if 0
+	case TCwhatever:
+		/* do something */
+		break;
+#endif
+	default:
+		for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
+			if (cmd == tty_ioctls[i].cmd)
+				break;
+		if (i < ARRAY_SIZE(tty_ioctls)) {
+			if (NULL != tty_ioctls[i].level)
+				printk("%s%s: %s: ioctl %s called\n",
+				       tty_ioctls[i].level, __FUNCTION__,
+				       tty->name, tty_ioctls[i].name);
+		} else {
+			printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
+			       __FUNCTION__, tty->name, cmd);
+		}
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+	return(ret);
+}
+
+static irqreturn_t line_write_interrupt(int irq, void *data,
+					struct pt_regs *unused)
+{
+	struct tty_struct *tty = data;
+	struct line *line = tty->driver_data;
+	int err;
+
+	err = flush_buffer(line);
+	if(err == 0)
+		return(IRQ_NONE);
+	else if(err < 0){
+		line->head = line->buffer;
+		line->tail = line->buffer;
+	}
+
+	if(tty == NULL)
+		return(IRQ_NONE);
+
+	if(test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
+	   (tty->ldisc.write_wakeup != NULL))
+		(tty->ldisc.write_wakeup)(tty);
+	
+	/* BLOCKING mode
+	 * In blocking mode, everything sleeps on tty->write_wait.
+	 * Sleeping in the console driver would break non-blocking
+	 * writes.
+	 */
+
+	if(waitqueue_active(&tty->write_wait))
+		wake_up_interruptible(&tty->write_wait);
+	return(IRQ_HANDLED);
+}
+
+int line_setup_irq(int fd, int input, int output, struct tty_struct *tty)
+{
+	struct line *line = tty->driver_data;
+	struct line_driver *driver = line->driver;
+	int err = 0, flags = SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM;
+
+	if(input) err = um_request_irq(driver->read_irq, fd, IRQ_READ, 
+				       line_interrupt, flags, 
+				       driver->read_irq_name, tty);
+	if(err) return(err);
+	if(output) err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, 
+					line_write_interrupt, flags, 
+					driver->write_irq_name, tty);
+	line->have_irq = 1;
+	return(err);
+}
+
+void line_disable(struct tty_struct *tty, int current_irq)
+{
+	struct line *line = tty->driver_data;
+
+	if(!line->have_irq)
+		return;
+
+	if(line->driver->read_irq == current_irq)
+		free_irq_later(line->driver->read_irq, tty);
+	else {
+		free_irq_by_irq_and_dev(line->driver->read_irq, tty);
+		free_irq(line->driver->read_irq, tty);
+	}
+
+	if(line->driver->write_irq == current_irq)
+		free_irq_later(line->driver->write_irq, tty);
+	else {
+		free_irq_by_irq_and_dev(line->driver->write_irq, tty);
+		free_irq(line->driver->write_irq, tty);
+	}
+
+	line->have_irq = 0;
+}
+
+int line_open(struct line *lines, struct tty_struct *tty,
+	      struct chan_opts *opts)
+{
+	struct line *line;
+	int err = 0;
+
+	line = &lines[tty->index];
+	tty->driver_data = line;
+
+	down(&line->sem);
+	if (tty->count == 1) {
+		if (!line->valid) {
+			err = -ENODEV;
+			goto out;
+		}
+		if (list_empty(&line->chan_list)) {
+			err = parse_chan_pair(line->init_str, &line->chan_list,
+					      line->init_pri, tty->index, opts);
+			if(err) goto out;
+			err = open_chan(&line->chan_list);
+			if(err) goto out;
+		}
+		enable_chan(&line->chan_list, tty);
+		INIT_WORK(&line->task, line_timer_cb, tty);
+	}
+
+	if(!line->sigio){
+		chan_enable_winch(&line->chan_list, tty);
+		line->sigio = 1;
+	}
+	chan_window_size(&line->chan_list, &tty->winsize.ws_row,
+			 &tty->winsize.ws_col);
+	line->count++;
+
+out:
+	up(&line->sem);
+	return(err);
+}
+
+void line_close(struct tty_struct *tty, struct file * filp)
+{
+	struct line *line = tty->driver_data;
+
+	down(&line->sem);
+	line->count--;
+	if (tty->count == 1) {
+		line_disable(tty, -1);
+		tty->driver_data = NULL;
+	}
+	up(&line->sem);
+}
+
+void close_lines(struct line *lines, int nlines)
+{
+	int i;
+
+	for(i = 0; i < nlines; i++)
+		close_chan(&lines[i].chan_list);
+}
+
+int line_setup(struct line *lines, int num, char *init, int all_allowed)
+{
+	int i, n;
+	char *end;
+
+	if(*init == '=') n = -1;
+	else {
+		n = simple_strtoul(init, &end, 0);
+		if(*end != '='){
+			printk(KERN_ERR "line_setup failed to parse \"%s\"\n", 
+			       init);
+			return(0);
+		}
+		init = end;
+	}
+	init++;
+	if((n >= 0) && (n >= num)){
+		printk("line_setup - %d out of range ((0 ... %d) allowed)\n",
+		       n, num - 1);
+		return(0);
+	}
+	else if (n >= 0){
+		if (lines[n].count > 0) {
+			printk("line_setup - device %d is open\n", n);
+			return(0);
+		}
+		if (lines[n].init_pri <= INIT_ONE){
+			lines[n].init_pri = INIT_ONE;
+			if (!strcmp(init, "none"))
+				lines[n].valid = 0;
+			else {
+				lines[n].init_str = init;
+				lines[n].valid = 1;
+			}	
+		}
+	}
+	else if(!all_allowed){
+		printk("line_setup - can't configure all devices from "
+		       "mconsole\n");
+		return(0);
+	}
+	else {
+		for(i = 0; i < num; i++){
+			if(lines[i].init_pri <= INIT_ALL){
+				lines[i].init_pri = INIT_ALL;
+				if(!strcmp(init, "none")) lines[i].valid = 0;
+				else {
+					lines[i].init_str = init;
+					lines[i].valid = 1;
+				}
+			}
+		}
+	}
+	return(1);
+}
+
+int line_config(struct line *lines, int num, char *str)
+{
+	char *new = uml_strdup(str);
+
+	if(new == NULL){
+		printk("line_config - uml_strdup failed\n");
+		return(-ENOMEM);
+	}
+	return(!line_setup(lines, num, new, 0));
+}
+
+int line_get_config(char *name, struct line *lines, int num, char *str, 
+		    int size, char **error_out)
+{
+	struct line *line;
+	char *end;
+	int dev, n = 0;
+
+	dev = simple_strtoul(name, &end, 0);
+	if((*end != '\0') || (end == name)){
+		*error_out = "line_get_config failed to parse device number";
+		return(0);
+	}
+
+	if((dev < 0) || (dev >= num)){
+		*error_out = "device number of of range";
+		return(0);
+	}
+
+	line = &lines[dev];
+
+	down(&line->sem);
+	if(!line->valid)
+		CONFIG_CHUNK(str, size, n, "none", 1);
+	else if(line->count == 0)
+		CONFIG_CHUNK(str, size, n, line->init_str, 1);
+	else n = chan_config_string(&line->chan_list, str, size, error_out);
+	up(&line->sem);
+
+	return(n);
+}
+
+int line_remove(struct line *lines, int num, char *str)
+{
+	char config[sizeof("conxxxx=none\0")];
+
+	sprintf(config, "%s=none", str);
+	return(!line_setup(lines, num, config, 0));
+}
+
+int line_write_room(struct tty_struct *tty)
+{
+	struct line *dev = tty->driver_data;
+	int room;
+
+	if (tty->stopped)
+		return 0;
+	room = write_room(dev);
+	if (0 == room)
+		printk(KERN_DEBUG "%s: %s: no room left in buffer\n",
+		       __FUNCTION__,tty->name);
+	return room;
+}
+
+struct tty_driver *line_register_devfs(struct lines *set,
+			 struct line_driver *line_driver, 
+			 struct tty_operations *ops, struct line *lines,
+			 int nlines)
+{
+	int i;
+	struct tty_driver *driver = alloc_tty_driver(nlines);
+
+	if (!driver)
+		return NULL;
+
+	driver->driver_name = line_driver->name;
+	driver->name = line_driver->device_name;
+	driver->devfs_name = line_driver->devfs_name;
+	driver->major = line_driver->major;
+	driver->minor_start = line_driver->minor_start;
+	driver->type = line_driver->type;
+	driver->subtype = line_driver->subtype;
+	driver->flags = TTY_DRIVER_REAL_RAW;
+	driver->init_termios = tty_std_termios;
+	tty_set_operations(driver, ops);
+
+	if (tty_register_driver(driver)) {
+		printk("%s: can't register %s driver\n",
+		       __FUNCTION__,line_driver->name);
+		put_tty_driver(driver);
+		return NULL;
+	}
+
+	for(i = 0; i < nlines; i++){
+		if(!lines[i].valid) 
+			tty_unregister_device(driver, i);
+	}
+
+	mconsole_register_dev(&line_driver->mc);
+	return driver;
+}
+
+void lines_init(struct line *lines, int nlines)
+{
+	struct line *line;
+	int i;
+
+	for(i = 0; i < nlines; i++){
+		line = &lines[i];
+		INIT_LIST_HEAD(&line->chan_list);
+		sema_init(&line->sem, 1);
+		if(line->init_str != NULL){
+			line->init_str = uml_strdup(line->init_str);
+			if(line->init_str == NULL)
+				printk("lines_init - uml_strdup returned "
+				       "NULL\n");
+		}
+	}
+}
+
+struct winch {
+	struct list_head list;
+	int fd;
+	int tty_fd;
+	int pid;
+	struct tty_struct *tty;
+};
+
+irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+	struct winch *winch = data;
+	struct tty_struct *tty;
+	struct line *line;
+	int err;
+	char c;
+
+	if(winch->fd != -1){
+		err = generic_read(winch->fd, &c, NULL);
+		if(err < 0){
+			if(err != -EAGAIN){
+				printk("winch_interrupt : read failed, "
+				       "errno = %d\n", -err);
+				printk("fd %d is losing SIGWINCH support\n",
+				       winch->tty_fd);
+				return(IRQ_HANDLED);
+			}
+			goto out;
+		}
+	}
+	tty  = winch->tty;
+	if (tty != NULL) {
+		line = tty->driver_data;
+		chan_window_size(&line->chan_list,
+				 &tty->winsize.ws_row, 
+				 &tty->winsize.ws_col);
+		kill_pg(tty->pgrp, SIGWINCH, 1);
+	}
+ out:
+	if(winch->fd != -1)
+		reactivate_fd(winch->fd, WINCH_IRQ);
+	return(IRQ_HANDLED);
+}
+
+DECLARE_MUTEX(winch_handler_sem);
+LIST_HEAD(winch_handlers);
+
+void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
+{
+	struct winch *winch;
+
+	down(&winch_handler_sem);
+	winch = kmalloc(sizeof(*winch), GFP_KERNEL);
+	if (winch == NULL) {
+		printk("register_winch_irq - kmalloc failed\n");
+		goto out;
+	}
+	*winch = ((struct winch) { .list  	= LIST_HEAD_INIT(winch->list),
+				   .fd  	= fd,
+				   .tty_fd 	= tty_fd,
+				   .pid  	= pid,
+				   .tty 	= tty });
+	list_add(&winch->list, &winch_handlers);
+	if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, 
+			  SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+			  "winch", winch) < 0)
+		printk("register_winch_irq - failed to register IRQ\n");
+ out:
+	up(&winch_handler_sem);
+}
+
+static void winch_cleanup(void)
+{
+	struct list_head *ele;
+	struct winch *winch;
+
+	list_for_each(ele, &winch_handlers){
+		winch = list_entry(ele, struct winch, list);
+		if(winch->fd != -1){
+			deactivate_fd(winch->fd, WINCH_IRQ);
+			os_close_file(winch->fd);
+		}
+		if(winch->pid != -1) 
+			os_kill_process(winch->pid, 1);
+	}
+}
+__uml_exitcall(winch_cleanup);
+
+char *add_xterm_umid(char *base)
+{
+	char *umid, *title;
+	int len;
+
+	umid = get_umid(1);
+	if(umid == NULL) return(base);
+	
+	len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
+	title = kmalloc(len, GFP_KERNEL);
+	if(title == NULL){
+		printk("Failed to allocate buffer for xterm title\n");
+		return(base);
+	}
+
+	snprintf(title, len, "%s (%s)", base, umid);
+	return(title);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */