2005-04-16 22:20:36 +00:00
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/*
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* This module exports the functions:
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*
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* 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
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* 'void clear_selection(void)'
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* 'int paste_selection(struct tty_struct *)'
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* 'int sel_loadlut(char __user *)'
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*
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* Now that /dev/vcs exists, most of this can disappear again.
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*/
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/uaccess.h>
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2007-07-16 06:40:40 +00:00
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#include <linux/kbd_kern.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/vt_kern.h>
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#include <linux/consolemap.h>
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#include <linux/selection.h>
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#include <linux/tiocl.h>
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#include <linux/console.h>
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/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
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#define isspace(c) ((c) == ' ')
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extern void poke_blanked_console(void);
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2012-02-28 14:49:23 +00:00
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/* FIXME: all this needs locking */
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2005-04-16 22:20:36 +00:00
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/* Variables for selection control. */
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/* Use a dynamic buffer, instead of static (Dec 1994) */
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2006-09-29 09:00:03 +00:00
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struct vc_data *sel_cons; /* must not be deallocated */
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2007-07-16 06:40:40 +00:00
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static int use_unicode;
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2005-04-16 22:20:36 +00:00
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static volatile int sel_start = -1; /* cleared by clear_selection */
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static int sel_end;
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static int sel_buffer_lth;
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static char *sel_buffer;
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/* clear_selection, highlight and highlight_pointer can be called
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from interrupt (via scrollback/front) */
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/* set reverse video on characters s-e of console with selection. */
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static inline void highlight(const int s, const int e)
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{
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invert_screen(sel_cons, s, e-s+2, 1);
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}
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/* use complementary color to show the pointer */
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static inline void highlight_pointer(const int where)
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{
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complement_pos(sel_cons, where);
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}
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2007-07-16 06:40:40 +00:00
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static u16
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2005-04-16 22:20:36 +00:00
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sel_pos(int n)
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{
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2007-07-16 06:40:40 +00:00
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return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
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use_unicode);
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2005-04-16 22:20:36 +00:00
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}
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/* remove the current selection highlight, if any,
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from the console holding the selection. */
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void
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clear_selection(void) {
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highlight_pointer(-1); /* hide the pointer */
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if (sel_start != -1) {
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highlight(sel_start, sel_end);
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sel_start = -1;
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}
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}
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/*
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* User settable table: what characters are to be considered alphabetic?
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2012-03-02 14:59:37 +00:00
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* 256 bits. FIXME: Needs a locking model.
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2005-04-16 22:20:36 +00:00
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*/
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static u32 inwordLut[8]={
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0x00000000, /* control chars */
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0x03FF0000, /* digits */
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0x87FFFFFE, /* uppercase and '_' */
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0x07FFFFFE, /* lowercase */
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0x00000000,
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0x00000000,
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0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
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0xFF7FFFFF /* latin-1 accented letters, not division sign */
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};
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2007-07-16 06:40:40 +00:00
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static inline int inword(const u16 c) {
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return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
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2005-04-16 22:20:36 +00:00
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}
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/* set inwordLut contents. Invoked by ioctl(). */
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int sel_loadlut(char __user *p)
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{
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return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0;
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}
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/* does screen address p correspond to character at LH/RH edge of screen? */
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static inline int atedge(const int p, int size_row)
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{
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return (!(p % size_row) || !((p + 2) % size_row));
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}
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/* constrain v such that v <= u */
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static inline unsigned short limit(const unsigned short v, const unsigned short u)
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{
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return (v > u) ? u : v;
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}
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2007-07-16 06:40:40 +00:00
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/* stores the char in UTF8 and returns the number of bytes used (1-3) */
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static int store_utf8(u16 c, char *p)
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{
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if (c < 0x80) {
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/* 0******* */
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p[0] = c;
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return 1;
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} else if (c < 0x800) {
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/* 110***** 10****** */
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p[0] = 0xc0 | (c >> 6);
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p[1] = 0x80 | (c & 0x3f);
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return 2;
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} else {
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/* 1110**** 10****** 10****** */
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p[0] = 0xe0 | (c >> 12);
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p[1] = 0x80 | ((c >> 6) & 0x3f);
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p[2] = 0x80 | (c & 0x3f);
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return 3;
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}
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}
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2005-04-16 22:20:36 +00:00
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/* set the current selection. Invoked by ioctl() or by kernel code. */
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int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
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{
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struct vc_data *vc = vc_cons[fg_console].d;
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int sel_mode, new_sel_start, new_sel_end, spc;
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char *bp, *obp;
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2007-07-16 06:40:40 +00:00
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int i, ps, pe, multiplier;
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u16 c;
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2012-02-28 14:49:23 +00:00
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int mode;
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2005-04-16 22:20:36 +00:00
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poke_blanked_console();
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{ unsigned short xs, ys, xe, ye;
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if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
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return -EFAULT;
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__get_user(xs, &sel->xs);
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__get_user(ys, &sel->ys);
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__get_user(xe, &sel->xe);
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__get_user(ye, &sel->ye);
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__get_user(sel_mode, &sel->sel_mode);
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xs--; ys--; xe--; ye--;
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xs = limit(xs, vc->vc_cols - 1);
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ys = limit(ys, vc->vc_rows - 1);
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xe = limit(xe, vc->vc_cols - 1);
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ye = limit(ye, vc->vc_rows - 1);
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ps = ys * vc->vc_size_row + (xs << 1);
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pe = ye * vc->vc_size_row + (xe << 1);
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if (sel_mode == TIOCL_SELCLEAR) {
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/* useful for screendump without selection highlights */
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clear_selection();
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return 0;
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}
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if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
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mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
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return 0;
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}
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}
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if (ps > pe) /* make sel_start <= sel_end */
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{
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int tmp = ps;
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ps = pe;
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pe = tmp;
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}
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if (sel_cons != vc_cons[fg_console].d) {
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clear_selection();
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sel_cons = vc_cons[fg_console].d;
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}
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2012-02-28 14:49:23 +00:00
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mode = vt_do_kdgkbmode(fg_console);
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if (mode == K_UNICODE)
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use_unicode = 1;
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else
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use_unicode = 0;
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2005-04-16 22:20:36 +00:00
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switch (sel_mode)
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{
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case TIOCL_SELCHAR: /* character-by-character selection */
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new_sel_start = ps;
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new_sel_end = pe;
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break;
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case TIOCL_SELWORD: /* word-by-word selection */
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spc = isspace(sel_pos(ps));
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for (new_sel_start = ps; ; ps -= 2)
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{
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if ((spc && !isspace(sel_pos(ps))) ||
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(!spc && !inword(sel_pos(ps))))
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break;
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new_sel_start = ps;
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if (!(ps % vc->vc_size_row))
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break;
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}
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spc = isspace(sel_pos(pe));
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for (new_sel_end = pe; ; pe += 2)
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{
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if ((spc && !isspace(sel_pos(pe))) ||
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(!spc && !inword(sel_pos(pe))))
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break;
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new_sel_end = pe;
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if (!((pe + 2) % vc->vc_size_row))
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break;
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}
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break;
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case TIOCL_SELLINE: /* line-by-line selection */
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new_sel_start = ps - ps % vc->vc_size_row;
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new_sel_end = pe + vc->vc_size_row
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- pe % vc->vc_size_row - 2;
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break;
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case TIOCL_SELPOINTER:
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highlight_pointer(pe);
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return 0;
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default:
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return -EINVAL;
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}
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/* remove the pointer */
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highlight_pointer(-1);
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/* select to end of line if on trailing space */
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if (new_sel_end > new_sel_start &&
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!atedge(new_sel_end, vc->vc_size_row) &&
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isspace(sel_pos(new_sel_end))) {
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for (pe = new_sel_end + 2; ; pe += 2)
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if (!isspace(sel_pos(pe)) ||
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atedge(pe, vc->vc_size_row))
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break;
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if (isspace(sel_pos(pe)))
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new_sel_end = pe;
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}
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if (sel_start == -1) /* no current selection */
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highlight(new_sel_start, new_sel_end);
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else if (new_sel_start == sel_start)
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{
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if (new_sel_end == sel_end) /* no action required */
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return 0;
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else if (new_sel_end > sel_end) /* extend to right */
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highlight(sel_end + 2, new_sel_end);
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else /* contract from right */
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highlight(new_sel_end + 2, sel_end);
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}
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else if (new_sel_end == sel_end)
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{
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if (new_sel_start < sel_start) /* extend to left */
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highlight(new_sel_start, sel_start - 2);
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else /* contract from left */
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highlight(sel_start, new_sel_start - 2);
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}
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else /* some other case; start selection from scratch */
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{
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clear_selection();
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highlight(new_sel_start, new_sel_end);
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}
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sel_start = new_sel_start;
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sel_end = new_sel_end;
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/* Allocate a new buffer before freeing the old one ... */
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2007-07-16 06:40:40 +00:00
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multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
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2009-01-30 20:27:14 +00:00
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bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
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2005-04-16 22:20:36 +00:00
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if (!bp) {
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printk(KERN_WARNING "selection: kmalloc() failed\n");
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clear_selection();
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return -ENOMEM;
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}
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2005-11-07 09:01:29 +00:00
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kfree(sel_buffer);
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2005-04-16 22:20:36 +00:00
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sel_buffer = bp;
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obp = bp;
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for (i = sel_start; i <= sel_end; i += 2) {
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2007-07-16 06:40:40 +00:00
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c = sel_pos(i);
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if (use_unicode)
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bp += store_utf8(c, bp);
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else
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*bp++ = c;
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if (!isspace(c))
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2005-04-16 22:20:36 +00:00
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obp = bp;
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if (! ((i + 2) % vc->vc_size_row)) {
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/* strip trailing blanks from line and add newline,
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unless non-space at end of line. */
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if (obp != bp) {
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bp = obp;
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*bp++ = '\r';
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}
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obp = bp;
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}
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}
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sel_buffer_lth = bp - sel_buffer;
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return 0;
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}
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/* Insert the contents of the selection buffer into the
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* queue of the tty associated with the current console.
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* Invoked by ioctl().
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2011-07-14 12:35:14 +00:00
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*
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2012-03-02 14:59:37 +00:00
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* Locking: called without locks. Calls the ldisc wrongly with
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* unsafe methods,
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2005-04-16 22:20:36 +00:00
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*/
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int paste_selection(struct tty_struct *tty)
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{
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2009-01-02 13:47:26 +00:00
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struct vc_data *vc = tty->driver_data;
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 04:54:13 +00:00
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int pasted = 0;
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unsigned int count;
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2005-04-16 22:20:36 +00:00
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struct tty_ldisc *ld;
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DECLARE_WAITQUEUE(wait, current);
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2010-06-01 20:52:54 +00:00
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2011-01-25 23:07:35 +00:00
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console_lock();
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2005-04-16 22:20:36 +00:00
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poke_blanked_console();
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2011-01-25 23:07:35 +00:00
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console_unlock();
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2005-04-16 22:20:36 +00:00
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2012-03-02 14:59:37 +00:00
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/* FIXME: wtf is this supposed to achieve ? */
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2010-06-01 20:53:06 +00:00
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ld = tty_ldisc_ref(tty);
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2012-03-02 14:59:37 +00:00
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if (!ld)
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2010-06-01 20:53:06 +00:00
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ld = tty_ldisc_ref_wait(tty);
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2012-03-02 14:59:37 +00:00
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/* FIXME: this is completely unsafe */
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2005-04-16 22:20:36 +00:00
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add_wait_queue(&vc->paste_wait, &wait);
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while (sel_buffer && sel_buffer_lth > pasted) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (test_bit(TTY_THROTTLED, &tty->flags)) {
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schedule();
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continue;
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}
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count = sel_buffer_lth - pasted;
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2011-06-03 21:33:24 +00:00
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count = min(count, tty->receive_room);
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tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
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2008-07-16 20:53:12 +00:00
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NULL, count);
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2005-04-16 22:20:36 +00:00
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pasted += count;
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}
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remove_wait_queue(&vc->paste_wait, &wait);
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2007-05-08 07:30:52 +00:00
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__set_current_state(TASK_RUNNING);
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2005-04-16 22:20:36 +00:00
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tty_ldisc_deref(ld);
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return 0;
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}
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