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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/char/sclp_tty.c
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
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!
Diffstat (limited to 'drivers/s390/char/sclp_tty.c')
-rw-r--r--drivers/s390/char/sclp_tty.c813
1 files changed, 813 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_tty.c b/drivers/s390/char/sclp_tty.c
new file mode 100644
index 000000000000..a20d7c89341d
--- /dev/null
+++ b/drivers/s390/char/sclp_tty.c
@@ -0,0 +1,813 @@
+/*
+ * drivers/s390/char/sclp_tty.c
+ * SCLP line mode terminal driver.
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/uaccess.h>
+
+#include "ctrlchar.h"
+#include "sclp.h"
+#include "sclp_rw.h"
+#include "sclp_tty.h"
+
+#define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
+
+/*
+ * size of a buffer that collects single characters coming in
+ * via sclp_tty_put_char()
+ */
+#define SCLP_TTY_BUF_SIZE 512
+
+/*
+ * There is exactly one SCLP terminal, so we can keep things simple
+ * and allocate all variables statically.
+ */
+
+/* Lock to guard over changes to global variables. */
+static spinlock_t sclp_tty_lock;
+/* List of free pages that can be used for console output buffering. */
+static struct list_head sclp_tty_pages;
+/* List of full struct sclp_buffer structures ready for output. */
+static struct list_head sclp_tty_outqueue;
+/* Counter how many buffers are emitted. */
+static int sclp_tty_buffer_count;
+/* Pointer to current console buffer. */
+static struct sclp_buffer *sclp_ttybuf;
+/* Timer for delayed output of console messages. */
+static struct timer_list sclp_tty_timer;
+/* Waitqueue to wait for buffers to get empty. */
+static wait_queue_head_t sclp_tty_waitq;
+
+static struct tty_struct *sclp_tty;
+static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
+static unsigned short int sclp_tty_chars_count;
+
+struct tty_driver *sclp_tty_driver;
+
+extern struct termios tty_std_termios;
+
+static struct sclp_ioctls sclp_ioctls;
+static struct sclp_ioctls sclp_ioctls_init =
+{
+ 8, /* 1 hor. tab. = 8 spaces */
+ 0, /* no echo of input by this driver */
+ 80, /* 80 characters/line */
+ 1, /* write after 1/10 s without final new line */
+ MAX_KMEM_PAGES, /* quick fix: avoid __alloc_pages */
+ MAX_KMEM_PAGES, /* take 32/64 pages from kernel memory, */
+ 0, /* do not convert to lower case */
+ 0x6c /* to seprate upper and lower case */
+ /* ('%' in EBCDIC) */
+};
+
+/* This routine is called whenever we try to open a SCLP terminal. */
+static int
+sclp_tty_open(struct tty_struct *tty, struct file *filp)
+{
+ sclp_tty = tty;
+ tty->driver_data = NULL;
+ tty->low_latency = 0;
+ return 0;
+}
+
+/* This routine is called when the SCLP terminal is closed. */
+static void
+sclp_tty_close(struct tty_struct *tty, struct file *filp)
+{
+ if (tty->count > 1)
+ return;
+ sclp_tty = NULL;
+}
+
+/* execute commands to control the i/o behaviour of the SCLP tty at runtime */
+static int
+sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned long flags;
+ unsigned int obuf;
+ int check;
+ int rc;
+
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ rc = 0;
+ check = 0;
+ switch (cmd) {
+ case TIOCSCLPSHTAB:
+ /* set width of horizontal tab */
+ if (get_user(sclp_ioctls.htab, (unsigned short __user *) arg))
+ rc = -EFAULT;
+ else
+ check = 1;
+ break;
+ case TIOCSCLPGHTAB:
+ /* get width of horizontal tab */
+ if (put_user(sclp_ioctls.htab, (unsigned short __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSECHO:
+ /* enable/disable echo of input */
+ if (get_user(sclp_ioctls.echo, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGECHO:
+ /* Is echo of input enabled ? */
+ if (put_user(sclp_ioctls.echo, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSCOLS:
+ /* set number of columns for output */
+ if (get_user(sclp_ioctls.columns, (unsigned short __user *) arg))
+ rc = -EFAULT;
+ else
+ check = 1;
+ break;
+ case TIOCSCLPGCOLS:
+ /* get number of columns for output */
+ if (put_user(sclp_ioctls.columns, (unsigned short __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSNL:
+ /* enable/disable writing without final new line character */
+ if (get_user(sclp_ioctls.final_nl, (signed char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGNL:
+ /* Is writing without final new line character enabled ? */
+ if (put_user(sclp_ioctls.final_nl, (signed char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSOBUF:
+ /*
+ * set the maximum buffers size for output, will be rounded
+ * up to next 4kB boundary and stored as number of SCCBs
+ * (4kB Buffers) limitation: 256 x 4kB
+ */
+ if (get_user(obuf, (unsigned int __user *) arg) == 0) {
+ if (obuf & 0xFFF)
+ sclp_ioctls.max_sccb = (obuf >> 12) + 1;
+ else
+ sclp_ioctls.max_sccb = (obuf >> 12);
+ } else
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGOBUF:
+ /* get the maximum buffers size for output */
+ obuf = sclp_ioctls.max_sccb << 12;
+ if (put_user(obuf, (unsigned int __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGKBUF:
+ /* get the number of buffers got from kernel at startup */
+ if (put_user(sclp_ioctls.kmem_sccb, (unsigned short __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSCASE:
+ /* enable/disable conversion from upper to lower case */
+ if (get_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGCASE:
+ /* Is conversion from upper to lower case of input enabled? */
+ if (put_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSDELIM:
+ /*
+ * set special character used for separating upper and
+ * lower case, 0x00 disables this feature
+ */
+ if (get_user(sclp_ioctls.delim, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGDELIM:
+ /*
+ * get special character used for separating upper and
+ * lower case, 0x00 disables this feature
+ */
+ if (put_user(sclp_ioctls.delim, (unsigned char __user *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSINIT:
+ /* set initial (default) sclp ioctls */
+ sclp_ioctls = sclp_ioctls_init;
+ check = 1;
+ break;
+ default:
+ rc = -ENOIOCTLCMD;
+ break;
+ }
+ if (check) {
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ if (sclp_ttybuf != NULL) {
+ sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
+ sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ }
+ return rc;
+}
+
+/*
+ * This routine returns the numbers of characters the tty driver
+ * will accept for queuing to be written. This number is subject
+ * to change as output buffers get emptied, or if the output flow
+ * control is acted. This is not an exact number because not every
+ * character needs the same space in the sccb. The worst case is
+ * a string of newlines. Every newlines creates a new mto which
+ * needs 8 bytes.
+ */
+static int
+sclp_tty_write_room (struct tty_struct *tty)
+{
+ unsigned long flags;
+ struct list_head *l;
+ int count;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ count = 0;
+ if (sclp_ttybuf != NULL)
+ count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
+ list_for_each(l, &sclp_tty_pages)
+ count += NR_EMPTY_MTO_PER_SCCB;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ return count;
+}
+
+static void
+sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
+{
+ unsigned long flags;
+ void *page;
+
+ do {
+ page = sclp_unmake_buffer(buffer);
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ /* Remove buffer from outqueue */
+ list_del(&buffer->list);
+ sclp_tty_buffer_count--;
+ list_add_tail((struct list_head *) page, &sclp_tty_pages);
+ /* Check if there is a pending buffer on the out queue. */
+ buffer = NULL;
+ if (!list_empty(&sclp_tty_outqueue))
+ buffer = list_entry(sclp_tty_outqueue.next,
+ struct sclp_buffer, list);
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
+ wake_up(&sclp_tty_waitq);
+ /* check if the tty needs a wake up call */
+ if (sclp_tty != NULL) {
+ tty_wakeup(sclp_tty);
+ }
+}
+
+static inline void
+__sclp_ttybuf_emit(struct sclp_buffer *buffer)
+{
+ unsigned long flags;
+ int count;
+ int rc;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ list_add_tail(&buffer->list, &sclp_tty_outqueue);
+ count = sclp_tty_buffer_count++;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ if (count)
+ return;
+ rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
+ if (rc)
+ sclp_ttybuf_callback(buffer, rc);
+}
+
+/*
+ * When this routine is called from the timer then we flush the
+ * temporary write buffer.
+ */
+static void
+sclp_tty_timeout(unsigned long data)
+{
+ unsigned long flags;
+ struct sclp_buffer *buf;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ buf = sclp_ttybuf;
+ sclp_ttybuf = NULL;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+
+ if (buf != NULL) {
+ __sclp_ttybuf_emit(buf);
+ }
+}
+
+/*
+ * Write a string to the sclp tty.
+ */
+static void
+sclp_tty_write_string(const unsigned char *str, int count)
+{
+ unsigned long flags;
+ void *page;
+ int written;
+ struct sclp_buffer *buf;
+
+ if (count <= 0)
+ return;
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ do {
+ /* Create a sclp output buffer if none exists yet */
+ if (sclp_ttybuf == NULL) {
+ while (list_empty(&sclp_tty_pages)) {
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ if (in_interrupt())
+ sclp_sync_wait();
+ else
+ wait_event(sclp_tty_waitq,
+ !list_empty(&sclp_tty_pages));
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ }
+ page = sclp_tty_pages.next;
+ list_del((struct list_head *) page);
+ sclp_ttybuf = sclp_make_buffer(page,
+ sclp_ioctls.columns,
+ sclp_ioctls.htab);
+ }
+ /* try to write the string to the current output buffer */
+ written = sclp_write(sclp_ttybuf, str, count);
+ if (written == count)
+ break;
+ /*
+ * Not all characters could be written to the current
+ * output buffer. Emit the buffer, create a new buffer
+ * and then output the rest of the string.
+ */
+ buf = sclp_ttybuf;
+ sclp_ttybuf = NULL;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ __sclp_ttybuf_emit(buf);
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ str += written;
+ count -= written;
+ } while (count > 0);
+ /* Setup timer to output current console buffer after 1/10 second */
+ if (sclp_ioctls.final_nl) {
+ if (sclp_ttybuf != NULL &&
+ sclp_chars_in_buffer(sclp_ttybuf) != 0 &&
+ !timer_pending(&sclp_tty_timer)) {
+ init_timer(&sclp_tty_timer);
+ sclp_tty_timer.function = sclp_tty_timeout;
+ sclp_tty_timer.data = 0UL;
+ sclp_tty_timer.expires = jiffies + HZ/10;
+ add_timer(&sclp_tty_timer);
+ }
+ } else {
+ if (sclp_ttybuf != NULL &&
+ sclp_chars_in_buffer(sclp_ttybuf) != 0) {
+ buf = sclp_ttybuf;
+ sclp_ttybuf = NULL;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ __sclp_ttybuf_emit(buf);
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+}
+
+/*
+ * This routine is called by the kernel to write a series of characters to the
+ * tty device. The characters may come from user space or kernel space. This
+ * routine will return the number of characters actually accepted for writing.
+ */
+static int
+sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
+ sclp_tty_chars_count = 0;
+ }
+ sclp_tty_write_string(buf, count);
+ return count;
+}
+
+/*
+ * This routine is called by the kernel to write a single character to the tty
+ * device. If the kernel uses this routine, it must call the flush_chars()
+ * routine (if defined) when it is done stuffing characters into the driver.
+ *
+ * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
+ * If the given character is a '\n' the contents of the SCLP write buffer
+ * - including previous characters from sclp_tty_put_char() and strings from
+ * sclp_write() without final '\n' - will be written.
+ */
+static void
+sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ sclp_tty_chars[sclp_tty_chars_count++] = ch;
+ if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * This routine is called by the kernel after it has written a series of
+ * characters to the tty device using put_char().
+ */
+static void
+sclp_tty_flush_chars(struct tty_struct *tty)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * This routine returns the number of characters in the write buffer of the
+ * SCLP driver. The provided number includes all characters that are stored
+ * in the SCCB (will be written next time the SCLP is not busy) as well as
+ * characters in the write buffer (will not be written as long as there is a
+ * final line feed missing).
+ */
+static int
+sclp_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ unsigned long flags;
+ struct list_head *l;
+ struct sclp_buffer *t;
+ int count;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ count = 0;
+ if (sclp_ttybuf != NULL)
+ count = sclp_chars_in_buffer(sclp_ttybuf);
+ list_for_each(l, &sclp_tty_outqueue) {
+ t = list_entry(l, struct sclp_buffer, list);
+ count += sclp_chars_in_buffer(t);
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ return count;
+}
+
+/*
+ * removes all content from buffers of low level driver
+ */
+static void
+sclp_tty_flush_buffer(struct tty_struct *tty)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * push input to tty
+ */
+static void
+sclp_tty_input(unsigned char* buf, unsigned int count)
+{
+ unsigned int cchar;
+
+ /*
+ * If this tty driver is currently closed
+ * then throw the received input away.
+ */
+ if (sclp_tty == NULL)
+ return;
+ cchar = ctrlchar_handle(buf, count, sclp_tty);
+ switch (cchar & CTRLCHAR_MASK) {
+ case CTRLCHAR_SYSRQ:
+ break;
+ case CTRLCHAR_CTRL:
+ sclp_tty->flip.count++;
+ *sclp_tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+ *sclp_tty->flip.char_buf_ptr++ = cchar;
+ tty_flip_buffer_push(sclp_tty);
+ break;
+ case CTRLCHAR_NONE:
+ /* send (normal) input to line discipline */
+ memcpy(sclp_tty->flip.char_buf_ptr, buf, count);
+ if (count < 2 ||
+ (strncmp ((const char *) buf + count - 2, "^n", 2) &&
+ strncmp ((const char *) buf + count - 2, "\0252n", 2))) {
+ sclp_tty->flip.char_buf_ptr[count] = '\n';
+ count++;
+ } else
+ count -= 2;
+ memset(sclp_tty->flip.flag_buf_ptr, TTY_NORMAL, count);
+ sclp_tty->flip.char_buf_ptr += count;
+ sclp_tty->flip.flag_buf_ptr += count;
+ sclp_tty->flip.count += count;
+ tty_flip_buffer_push(sclp_tty);
+ break;
+ }
+}
+
+/*
+ * get a EBCDIC string in upper/lower case,
+ * find out characters in lower/upper case separated by a special character,
+ * modifiy original string,
+ * returns length of resulting string
+ */
+static int
+sclp_switch_cases(unsigned char *buf, int count,
+ unsigned char delim, int tolower)
+{
+ unsigned char *ip, *op;
+ int toggle;
+
+ /* initially changing case is off */
+ toggle = 0;
+ ip = op = buf;
+ while (count-- > 0) {
+ /* compare with special character */
+ if (*ip == delim) {
+ /* followed by another special character? */
+ if (count && ip[1] == delim) {
+ /*
+ * ... then put a single copy of the special
+ * character to the output string
+ */
+ *op++ = *ip++;
+ count--;
+ } else
+ /*
+ * ... special character follower by a normal
+ * character toggles the case change behaviour
+ */
+ toggle = ~toggle;
+ /* skip special character */
+ ip++;
+ } else
+ /* not the special character */
+ if (toggle)
+ /* but case switching is on */
+ if (tolower)
+ /* switch to uppercase */
+ *op++ = _ebc_toupper[(int) *ip++];
+ else
+ /* switch to lowercase */
+ *op++ = _ebc_tolower[(int) *ip++];
+ else
+ /* no case switching, copy the character */
+ *op++ = *ip++;
+ }
+ /* return length of reformatted string. */
+ return op - buf;
+}
+
+static void
+sclp_get_input(unsigned char *start, unsigned char *end)
+{
+ int count;
+
+ count = end - start;
+ /*
+ * if set in ioctl convert EBCDIC to lower case
+ * (modify original input in SCCB)
+ */
+ if (sclp_ioctls.tolower)
+ EBC_TOLOWER(start, count);
+
+ /*
+ * if set in ioctl find out characters in lower or upper case
+ * (depends on current case) separated by a special character,
+ * works on EBCDIC
+ */
+ if (sclp_ioctls.delim)
+ count = sclp_switch_cases(start, count,
+ sclp_ioctls.delim,
+ sclp_ioctls.tolower);
+
+ /* convert EBCDIC to ASCII (modify original input in SCCB) */
+ sclp_ebcasc_str(start, count);
+
+ /* if set in ioctl write operators input to console */
+ if (sclp_ioctls.echo)
+ sclp_tty_write(sclp_tty, start, count);
+
+ /* transfer input to high level driver */
+ sclp_tty_input(start, count);
+}
+
+static inline struct gds_vector *
+find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
+{
+ struct gds_vector *vec;
+
+ for (vec = start; vec < end; vec = (void *) vec + vec->length)
+ if (vec->gds_id == id)
+ return vec;
+ return NULL;
+}
+
+static inline struct gds_subvector *
+find_gds_subvector(struct gds_subvector *start,
+ struct gds_subvector *end, u8 key)
+{
+ struct gds_subvector *subvec;
+
+ for (subvec = start; subvec < end;
+ subvec = (void *) subvec + subvec->length)
+ if (subvec->key == key)
+ return subvec;
+ return NULL;
+}
+
+static inline void
+sclp_eval_selfdeftextmsg(struct gds_subvector *start,
+ struct gds_subvector *end)
+{
+ struct gds_subvector *subvec;
+
+ subvec = start;
+ while (subvec < end) {
+ subvec = find_gds_subvector(subvec, end, 0x30);
+ if (!subvec)
+ break;
+ sclp_get_input((unsigned char *)(subvec + 1),
+ (unsigned char *) subvec + subvec->length);
+ subvec = (void *) subvec + subvec->length;
+ }
+}
+
+static inline void
+sclp_eval_textcmd(struct gds_subvector *start,
+ struct gds_subvector *end)
+{
+ struct gds_subvector *subvec;
+
+ subvec = start;
+ while (subvec < end) {
+ subvec = find_gds_subvector(subvec, end,
+ GDS_KEY_SelfDefTextMsg);
+ if (!subvec)
+ break;
+ sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
+ (void *)subvec + subvec->length);
+ subvec = (void *) subvec + subvec->length;
+ }
+}
+
+static inline void
+sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
+{
+ struct gds_vector *vec;
+
+ vec = start;
+ while (vec < end) {
+ vec = find_gds_vector(vec, end, GDS_ID_TextCmd);
+ if (!vec)
+ break;
+ sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
+ (void *) vec + vec->length);
+ vec = (void *) vec + vec->length;
+ }
+}
+
+
+static inline void
+sclp_eval_mdsmu(struct gds_vector *start, void *end)
+{
+ struct gds_vector *vec;
+
+ vec = find_gds_vector(start, end, GDS_ID_CPMSU);
+ if (vec)
+ sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
+}
+
+static void
+sclp_tty_receiver(struct evbuf_header *evbuf)
+{
+ struct gds_vector *start, *end, *vec;
+
+ start = (struct gds_vector *)(evbuf + 1);
+ end = (void *) evbuf + evbuf->length;
+ vec = find_gds_vector(start, end, GDS_ID_MDSMU);
+ if (vec)
+ sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
+}
+
+static void
+sclp_tty_state_change(struct sclp_register *reg)
+{
+}
+
+static struct sclp_register sclp_input_event =
+{
+ .receive_mask = EvTyp_OpCmd_Mask | EvTyp_PMsgCmd_Mask,
+ .state_change_fn = sclp_tty_state_change,
+ .receiver_fn = sclp_tty_receiver
+};
+
+static struct tty_operations sclp_ops = {
+ .open = sclp_tty_open,
+ .close = sclp_tty_close,
+ .write = sclp_tty_write,
+ .put_char = sclp_tty_put_char,
+ .flush_chars = sclp_tty_flush_chars,
+ .write_room = sclp_tty_write_room,
+ .chars_in_buffer = sclp_tty_chars_in_buffer,
+ .flush_buffer = sclp_tty_flush_buffer,
+ .ioctl = sclp_tty_ioctl,
+};
+
+int __init
+sclp_tty_init(void)
+{
+ struct tty_driver *driver;
+ void *page;
+ int i;
+ int rc;
+
+ if (!CONSOLE_IS_SCLP)
+ return 0;
+ driver = alloc_tty_driver(1);
+ if (!driver)
+ return -ENOMEM;
+
+ rc = sclp_rw_init();
+ if (rc) {
+ printk(KERN_ERR SCLP_TTY_PRINT_HEADER
+ "could not register tty - "
+ "sclp_rw_init returned %d\n", rc);
+ put_tty_driver(driver);
+ return rc;
+ }
+ /* Allocate pages for output buffering */
+ INIT_LIST_HEAD(&sclp_tty_pages);
+ for (i = 0; i < MAX_KMEM_PAGES; i++) {
+ page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (page == NULL) {
+ put_tty_driver(driver);
+ return -ENOMEM;
+ }
+ list_add_tail((struct list_head *) page, &sclp_tty_pages);
+ }
+ INIT_LIST_HEAD(&sclp_tty_outqueue);
+ spin_lock_init(&sclp_tty_lock);
+ init_waitqueue_head(&sclp_tty_waitq);
+ init_timer(&sclp_tty_timer);
+ sclp_ttybuf = NULL;
+ sclp_tty_buffer_count = 0;
+ if (MACHINE_IS_VM) {
+ /*
+ * save 4 characters for the CPU number
+ * written at start of each line by VM/CP
+ */
+ sclp_ioctls_init.columns = 76;
+ /* case input lines to lowercase */
+ sclp_ioctls_init.tolower = 1;
+ }
+ sclp_ioctls = sclp_ioctls_init;
+ sclp_tty_chars_count = 0;
+ sclp_tty = NULL;
+
+ rc = sclp_register(&sclp_input_event);
+ if (rc) {
+ put_tty_driver(driver);
+ return rc;
+ }
+
+ driver->owner = THIS_MODULE;
+ driver->driver_name = "sclp_line";
+ driver->name = "sclp_line";
+ driver->major = TTY_MAJOR;
+ driver->minor_start = 64;
+ driver->type = TTY_DRIVER_TYPE_SYSTEM;
+ driver->subtype = SYSTEM_TYPE_TTY;
+ driver->init_termios = tty_std_termios;
+ driver->init_termios.c_iflag = IGNBRK | IGNPAR;
+ driver->init_termios.c_oflag = ONLCR | XTABS;
+ driver->init_termios.c_lflag = ISIG | ECHO;
+ driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(driver, &sclp_ops);
+ rc = tty_register_driver(driver);
+ if (rc) {
+ printk(KERN_ERR SCLP_TTY_PRINT_HEADER
+ "could not register tty - "
+ "tty_register_driver returned %d\n", rc);
+ put_tty_driver(driver);
+ return rc;
+ }
+ sclp_tty_driver = driver;
+ return 0;
+}
+module_init(sclp_tty_init);