Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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:
+ */