Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 345 insertions, 0 deletions

diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
new file mode 100644
index 000000000000..fb864e7fcd13
--- /dev/null
+++ b/drivers/tty/vt/selection.c
@@ -0,0 +1,345 @@
+/*
+ * This module exports the functions:
+ *
+ *     'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
+ *     'void clear_selection(void)'
+ *     'int paste_selection(struct tty_struct *)'
+ *     'int sel_loadlut(char __user *)'
+ *
+ * Now that /dev/vcs exists, most of this can disappear again.
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <asm/uaccess.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/consolemap.h>
+#include <linux/selection.h>
+#include <linux/tiocl.h>
+#include <linux/console.h>
+
+/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
+#define isspace(c)      ((c) == ' ')
+
+extern void poke_blanked_console(void);
+
+/* Variables for selection control. */
+/* Use a dynamic buffer, instead of static (Dec 1994) */
+struct vc_data *sel_cons;               /* must not be deallocated */
+static int use_unicode;
+static volatile int sel_start = -1;     /* cleared by clear_selection */
+static int sel_end;
+static int sel_buffer_lth;
+static char *sel_buffer;
+
+/* clear_selection, highlight and highlight_pointer can be called
+   from interrupt (via scrollback/front) */
+
+/* set reverse video on characters s-e of console with selection. */
+static inline void highlight(const int s, const int e)
+{
+        invert_screen(sel_cons, s, e-s+2, 1);
+}
+
+/* use complementary color to show the pointer */
+static inline void highlight_pointer(const int where)
+{
+        complement_pos(sel_cons, where);
+}
+
+static u16
+sel_pos(int n)
+{
+        return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
+                                use_unicode);
+}
+
+/* remove the current selection highlight, if any,
+   from the console holding the selection. */
+void
+clear_selection(void) {
+        highlight_pointer(-1); /* hide the pointer */
+        if (sel_start != -1) {
+                highlight(sel_start, sel_end);
+                sel_start = -1;
+        }
+}
+
+/*
+ * User settable table: what characters are to be considered alphabetic?
+ * 256 bits
+ */
+static u32 inwordLut[8]={
+  0x00000000, /* control chars     */
+  0x03FF0000, /* digits            */
+  0x87FFFFFE, /* uppercase and '_' */
+  0x07FFFFFE, /* lowercase         */
+  0x00000000,
+  0x00000000,
+  0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
+  0xFF7FFFFF  /* latin-1 accented letters, not division sign */
+};
+
+static inline int inword(const u16 c) {
+        return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
+}
+
+/* set inwordLut contents. Invoked by ioctl(). */
+int sel_loadlut(char __user *p)
+{
+        return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0;
+}
+
+/* does screen address p correspond to character at LH/RH edge of screen? */
+static inline int atedge(const int p, int size_row)
+{
+        return (!(p % size_row) || !((p + 2) % size_row));
+}
+
+/* constrain v such that v <= u */
+static inline unsigned short limit(const unsigned short v, const unsigned short u)
+{
+        return (v > u) ? u : v;
+}
+
+/* stores the char in UTF8 and returns the number of bytes used (1-3) */
+static int store_utf8(u16 c, char *p)
+{
+        if (c < 0x80) {
+                /*  0******* */
+                p[0] = c;
+                return 1;
+        } else if (c < 0x800) {
+                /* 110***** 10****** */
+                p[0] = 0xc0 | (c >> 6);
+                p[1] = 0x80 | (c & 0x3f);
+                return 2;
+        } else {
+                /* 1110**** 10****** 10****** */
+                p[0] = 0xe0 | (c >> 12);
+                p[1] = 0x80 | ((c >> 6) & 0x3f);
+                p[2] = 0x80 | (c & 0x3f);
+                return 3;
+        }
+}
+
+/* set the current selection. Invoked by ioctl() or by kernel code. */
+int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+        int sel_mode, new_sel_start, new_sel_end, spc;
+        char *bp, *obp;
+        int i, ps, pe, multiplier;
+        u16 c;
+        struct kbd_struct *kbd = kbd_table + fg_console;
+
+        poke_blanked_console();
+
+        { unsigned short xs, ys, xe, ye;
+
+          if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
+                return -EFAULT;
+          __get_user(xs, &sel->xs);
+          __get_user(ys, &sel->ys);
+          __get_user(xe, &sel->xe);
+          __get_user(ye, &sel->ye);
+          __get_user(sel_mode, &sel->sel_mode);
+          xs--; ys--; xe--; ye--;
+          xs = limit(xs, vc->vc_cols - 1);
+          ys = limit(ys, vc->vc_rows - 1);
+          xe = limit(xe, vc->vc_cols - 1);
+          ye = limit(ye, vc->vc_rows - 1);
+          ps = ys * vc->vc_size_row + (xs << 1);
+          pe = ye * vc->vc_size_row + (xe << 1);
+
+          if (sel_mode == TIOCL_SELCLEAR) {
+              /* useful for screendump without selection highlights */
+              clear_selection();
+              return 0;
+          }
+
+          if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
+              mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
+              return 0;
+          }
+        }
+
+        if (ps > pe)    /* make sel_start <= sel_end */
+        {
+                int tmp = ps;
+                ps = pe;
+                pe = tmp;
+        }
+
+        if (sel_cons != vc_cons[fg_console].d) {
+                clear_selection();
+                sel_cons = vc_cons[fg_console].d;
+        }
+        use_unicode = kbd && kbd->kbdmode == VC_UNICODE;
+
+        switch (sel_mode)
+        {
+                case TIOCL_SELCHAR:     /* character-by-character selection */
+                        new_sel_start = ps;
+                        new_sel_end = pe;
+                        break;
+                case TIOCL_SELWORD:     /* word-by-word selection */
+                        spc = isspace(sel_pos(ps));
+                        for (new_sel_start = ps; ; ps -= 2)
+                        {
+                                if ((spc && !isspace(sel_pos(ps))) ||
+                                    (!spc && !inword(sel_pos(ps))))
+                                        break;
+                                new_sel_start = ps;
+                                if (!(ps % vc->vc_size_row))
+                                        break;
+                        }
+                        spc = isspace(sel_pos(pe));
+                        for (new_sel_end = pe; ; pe += 2)
+                        {
+                                if ((spc && !isspace(sel_pos(pe))) ||
+                                    (!spc && !inword(sel_pos(pe))))
+                                        break;
+                                new_sel_end = pe;
+                                if (!((pe + 2) % vc->vc_size_row))
+                                        break;
+                        }
+                        break;
+                case TIOCL_SELLINE:     /* line-by-line selection */
+                        new_sel_start = ps - ps % vc->vc_size_row;
+                        new_sel_end = pe + vc->vc_size_row
+                                    - pe % vc->vc_size_row - 2;
+                        break;
+                case TIOCL_SELPOINTER:
+                        highlight_pointer(pe);
+                        return 0;
+                default:
+                        return -EINVAL;
+        }
+
+        /* remove the pointer */
+        highlight_pointer(-1);
+
+        /* select to end of line if on trailing space */
+        if (new_sel_end > new_sel_start &&
+                !atedge(new_sel_end, vc->vc_size_row) &&
+                isspace(sel_pos(new_sel_end))) {
+                for (pe = new_sel_end + 2; ; pe += 2)
+                        if (!isspace(sel_pos(pe)) ||
+                            atedge(pe, vc->vc_size_row))
+                                break;
+                if (isspace(sel_pos(pe)))
+                        new_sel_end = pe;
+        }
+        if (sel_start == -1)    /* no current selection */
+                highlight(new_sel_start, new_sel_end);
+        else if (new_sel_start == sel_start)
+        {
+                if (new_sel_end == sel_end)     /* no action required */
+                        return 0;
+                else if (new_sel_end > sel_end) /* extend to right */
+                        highlight(sel_end + 2, new_sel_end);
+                else                            /* contract from right */
+                        highlight(new_sel_end + 2, sel_end);
+        }
+        else if (new_sel_end == sel_end)
+        {
+                if (new_sel_start < sel_start)  /* extend to left */
+                        highlight(new_sel_start, sel_start - 2);
+                else                            /* contract from left */
+                        highlight(sel_start, new_sel_start - 2);
+        }
+        else    /* some other case; start selection from scratch */
+        {
+                clear_selection();
+                highlight(new_sel_start, new_sel_end);
+        }
+        sel_start = new_sel_start;
+        sel_end = new_sel_end;
+
+        /* Allocate a new buffer before freeing the old one ... */
+        multiplier = use_unicode ? 3 : 1;  /* chars can take up to 3 bytes */
+        bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
+        if (!bp) {
+                printk(KERN_WARNING "selection: kmalloc() failed\n");
+                clear_selection();
+                return -ENOMEM;
+        }
+        kfree(sel_buffer);
+        sel_buffer = bp;
+
+        obp = bp;
+        for (i = sel_start; i <= sel_end; i += 2) {
+                c = sel_pos(i);
+                if (use_unicode)
+                        bp += store_utf8(c, bp);
+                else
+                        *bp++ = c;
+                if (!isspace(c))
+                        obp = bp;
+                if (! ((i + 2) % vc->vc_size_row)) {
+                        /* strip trailing blanks from line and add newline,
+                           unless non-space at end of line. */
+                        if (obp != bp) {
+                                bp = obp;
+                                *bp++ = '\r';
+                        }
+                        obp = bp;
+                }
+        }
+        sel_buffer_lth = bp - sel_buffer;
+        return 0;
+}
+
+/* Insert the contents of the selection buffer into the
+ * queue of the tty associated with the current console.
+ * Invoked by ioctl().
+ */
+int paste_selection(struct tty_struct *tty)
+{
+        struct vc_data *vc = tty->driver_data;
+        int     pasted = 0;
+        unsigned int count;
+        struct  tty_ldisc *ld;
+        DECLARE_WAITQUEUE(wait, current);
+
+        /* always called with BTM from vt_ioctl */
+        WARN_ON(!tty_locked());
+
+        console_lock();
+        poke_blanked_console();
+        console_unlock();
+
+        ld = tty_ldisc_ref(tty);
+        if (!ld) {
+                tty_unlock();
+                ld = tty_ldisc_ref_wait(tty);
+                tty_lock();
+        }
+
+        add_wait_queue(&vc->paste_wait, &wait);
+        while (sel_buffer && sel_buffer_lth > pasted) {
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (test_bit(TTY_THROTTLED, &tty->flags)) {
+                        schedule();
+                        continue;
+                }
+                count = sel_buffer_lth - pasted;
+                count = min(count, tty->receive_room);
+                tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
+                                                                NULL, count);
+                pasted += count;
+        }
+        remove_wait_queue(&vc->paste_wait, &wait);
+        __set_current_state(TASK_RUNNING);
+
+        tty_ldisc_deref(ld);
+        return 0;
+}