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-rw-r--r--drivers/tty/vt/vt.c220
-rw-r--r--include/linux/console_struct.h2
2 files changed, 211 insertions, 11 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 1eb1a376a041..7b636638b36d 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -317,6 +317,171 @@ void schedule_console_callback(void)
schedule_work(&console_work);
}
+/*
+ * Code to manage unicode-based screen buffers
+ */
+
+#ifdef NO_VC_UNI_SCREEN
+/* this disables and optimizes related code away at compile time */
+#define get_vc_uniscr(vc) NULL
+#else
+#define get_vc_uniscr(vc) vc->vc_uni_screen
+#endif
+
+typedef uint32_t char32_t;
+
+/*
+ * Our screen buffer is preceded by an array of line pointers so that
+ * scrolling only implies some pointer shuffling.
+ */
+struct uni_screen {
+ char32_t *lines[0];
+};
+
+static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
+{
+ struct uni_screen *uniscr;
+ void *p;
+ unsigned int memsize, i;
+
+ /* allocate everything in one go */
+ memsize = cols * rows * sizeof(char32_t);
+ memsize += rows * sizeof(char32_t *);
+ p = kmalloc(memsize, GFP_KERNEL);
+ if (!p)
+ return NULL;
+
+ /* initial line pointers */
+ uniscr = p;
+ p = uniscr->lines + rows;
+ for (i = 0; i < rows; i++) {
+ uniscr->lines[i] = p;
+ p += cols * sizeof(char32_t);
+ }
+ return uniscr;
+}
+
+static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
+{
+ kfree(vc->vc_uni_screen);
+ vc->vc_uni_screen = new_uniscr;
+}
+
+static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr)
+ uniscr->lines[vc->vc_y][vc->vc_x] = uc;
+}
+
+static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->vc_y];
+ unsigned int x = vc->vc_x, cols = vc->vc_cols;
+
+ memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
+ memset32(&ln[x], ' ', nr);
+ }
+}
+
+static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->vc_y];
+ unsigned int x = vc->vc_x, cols = vc->vc_cols;
+
+ memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
+ memset32(&ln[cols - nr], ' ', nr);
+ }
+}
+
+static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
+ unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->vc_y];
+
+ memset32(&ln[x], ' ', nr);
+ }
+}
+
+static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
+ unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ unsigned int cols = vc->vc_cols;
+
+ while (nr--)
+ memset32(uniscr->lines[y++], ' ', cols);
+ }
+}
+
+static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
+ enum con_scroll dir, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ unsigned int s, d, rescue, clear;
+ char32_t *save[nr];
+
+ s = clear = t;
+ d = t + nr;
+ rescue = b - nr;
+ if (dir == SM_UP) {
+ swap(s, d);
+ swap(clear, rescue);
+ }
+ memcpy(save, uniscr->lines + rescue, nr * sizeof(*save));
+ memmove(uniscr->lines + d, uniscr->lines + s,
+ (b - t - nr) * sizeof(*uniscr->lines));
+ memcpy(uniscr->lines + clear, save, nr * sizeof(*save));
+ vc_uniscr_clear_lines(vc, clear, nr);
+ }
+}
+
+static void vc_uniscr_copy_area(struct uni_screen *dst,
+ unsigned int dst_cols,
+ unsigned int dst_rows,
+ struct uni_screen *src,
+ unsigned int src_cols,
+ unsigned int src_top_row,
+ unsigned int src_bot_row)
+{
+ unsigned int dst_row = 0;
+
+ if (!dst)
+ return;
+
+ while (src_top_row < src_bot_row) {
+ char32_t *src_line = src->lines[src_top_row];
+ char32_t *dst_line = dst->lines[dst_row];
+
+ memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
+ if (dst_cols - src_cols)
+ memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
+ src_top_row++;
+ dst_row++;
+ }
+ while (dst_row < dst_rows) {
+ char32_t *dst_line = dst->lines[dst_row];
+
+ memset32(dst_line, ' ', dst_cols);
+ dst_row++;
+ }
+}
+
+
static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
enum con_scroll dir, unsigned int nr)
{
@@ -326,6 +491,7 @@ static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
+ vc_uniscr_scroll(vc, t, b, dir, nr);
if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
return;
@@ -533,6 +699,7 @@ static void insert_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p = (unsigned short *) vc->vc_pos;
+ vc_uniscr_insert(vc, nr);
scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
@@ -545,6 +712,7 @@ static void delete_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p = (unsigned short *) vc->vc_pos;
+ vc_uniscr_delete(vc, nr);
scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
nr * 2);
@@ -845,10 +1013,11 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
{
unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
unsigned long end;
- unsigned int old_rows, old_row_size;
+ unsigned int old_rows, old_row_size, first_copied_row;
unsigned int new_cols, new_rows, new_row_size, new_screen_size;
unsigned int user;
unsigned short *newscreen;
+ struct uni_screen *new_uniscr = NULL;
WARN_CONSOLE_UNLOCKED();
@@ -875,6 +1044,14 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
if (!newscreen)
return -ENOMEM;
+ if (get_vc_uniscr(vc)) {
+ new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
+ if (!new_uniscr) {
+ kfree(newscreen);
+ return -ENOMEM;
+ }
+ }
+
if (vc == sel_cons)
clear_selection();
@@ -884,6 +1061,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
err = resize_screen(vc, new_cols, new_rows, user);
if (err) {
kfree(newscreen);
+ kfree(new_uniscr);
return err;
}
@@ -904,18 +1082,24 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
* Cursor near the bottom, copy contents from the
* bottom of buffer
*/
- old_origin += (old_rows - new_rows) * old_row_size;
+ first_copied_row = (old_rows - new_rows);
} else {
/*
* Cursor is in no man's land, copy 1/2 screenful
* from the top and bottom of cursor position
*/
- old_origin += (vc->vc_y - new_rows/2) * old_row_size;
+ first_copied_row = (vc->vc_y - new_rows/2);
}
- }
-
+ old_origin += first_copied_row * old_row_size;
+ } else
+ first_copied_row = 0;
end = old_origin + old_row_size * min(old_rows, new_rows);
+ vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
+ get_vc_uniscr(vc), rlth/2, first_copied_row,
+ min(old_rows, new_rows));
+ vc_uniscr_set(vc, new_uniscr);
+
update_attr(vc);
while (old_origin < end) {
@@ -1013,6 +1197,7 @@ struct vc_data *vc_deallocate(unsigned int currcons)
vc->vc_sw->con_deinit(vc);
put_pid(vc->vt_pid);
module_put(vc->vc_sw->owner);
+ vc_uniscr_set(vc, NULL);
kfree(vc->vc_screenbuf);
vc_cons[currcons].d = NULL;
}
@@ -1171,15 +1356,22 @@ static void csi_J(struct vc_data *vc, int vpar)
switch (vpar) {
case 0: /* erase from cursor to end of display */
+ vc_uniscr_clear_line(vc, vc->vc_x,
+ vc->vc_cols - vc->vc_x);
+ vc_uniscr_clear_lines(vc, vc->vc_y + 1,
+ vc->vc_rows - vc->vc_y - 1);
count = (vc->vc_scr_end - vc->vc_pos) >> 1;
start = (unsigned short *)vc->vc_pos;
break;
case 1: /* erase from start to cursor */
+ vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
+ vc_uniscr_clear_lines(vc, 0, vc->vc_y);
count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
start = (unsigned short *)vc->vc_origin;
break;
case 2: /* erase whole display */
case 3: /* (and scrollback buffer later) */
+ vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
count = vc->vc_cols * vc->vc_rows;
start = (unsigned short *)vc->vc_origin;
break;
@@ -1200,25 +1392,27 @@ static void csi_J(struct vc_data *vc, int vpar)
static void csi_K(struct vc_data *vc, int vpar)
{
unsigned int count;
- unsigned short * start;
+ unsigned short *start = (unsigned short *)vc->vc_pos;
+ int offset;
switch (vpar) {
case 0: /* erase from cursor to end of line */
+ offset = 0;
count = vc->vc_cols - vc->vc_x;
- start = (unsigned short *)vc->vc_pos;
break;
case 1: /* erase from start of line to cursor */
- start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+ offset = -vc->vc_x;
count = vc->vc_x + 1;
break;
case 2: /* erase whole line */
- start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+ offset = -vc->vc_x;
count = vc->vc_cols;
break;
default:
return;
}
- scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+ vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
+ scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
if (con_should_update(vc))
do_update_region(vc, (unsigned long) start, count);
@@ -1232,6 +1426,7 @@ static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar posi
vpar++;
count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
+ vc_uniscr_clear_line(vc, vc->vc_x, count);
scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
if (con_should_update(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
@@ -2188,7 +2383,7 @@ static void con_flush(struct vc_data *vc, unsigned long draw_from,
/* acquires console_lock */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
- int c, tc, ok, n = 0, draw_x = -1;
+ int c, next_c, tc, ok, n = 0, draw_x = -1;
unsigned int currcons;
unsigned long draw_from = 0, draw_to = 0;
struct vc_data *vc;
@@ -2382,6 +2577,7 @@ rescan_last_byte:
con_flush(vc, draw_from, draw_to, &draw_x);
}
+ next_c = c;
while (1) {
if (vc->vc_need_wrap || vc->vc_decim)
con_flush(vc, draw_from, draw_to,
@@ -2392,6 +2588,7 @@ rescan_last_byte:
}
if (vc->vc_decim)
insert_char(vc, 1);
+ vc_uniscr_putc(vc, next_c);
scr_writew(himask ?
((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc_attr << 8) + tc,
@@ -2412,6 +2609,7 @@ rescan_last_byte:
tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
if (tc < 0) tc = ' ';
+ next_c = ' ';
}
notify_write(vc, c);
diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h
index c0ec478ea5bf..2c8d3239899b 100644
--- a/include/linux/console_struct.h
+++ b/include/linux/console_struct.h
@@ -19,6 +19,7 @@
struct vt_struct;
struct uni_pagedir;
+struct uni_screen;
#define NPAR 16
@@ -140,6 +141,7 @@ struct vc_data {
struct vc_data **vc_display_fg; /* [!] Ptr to var holding fg console for this display */
struct uni_pagedir *vc_uni_pagedir;
struct uni_pagedir **vc_uni_pagedir_loc; /* [!] Location of uni_pagedir variable for this console */
+ struct uni_screen *vc_uni_screen; /* unicode screen content */
bool vc_panic_force_write; /* when oops/panic this VC can accept forced output/blanking */
/* additional information is in vt_kern.h */
};
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-23 06:01:40 +0300