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tty: vt, unify scrolling functions 

Both scrup and scrdown are copies of the same code except source and
destination pointers computation. Unify those functions into a single
one named con_scroll.

Note that scrdown used step to compute the destination, while scrup
did the computation explicitly. We sticked to the latter here.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2016-10-03 11:18:34 +02:00 committed by Greg Kroah-Hartman
parent d705ff3818
commit 89765b9424
1 changed files with 18 additions and 31 deletions
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49
drivers/tty/vt/vt.c
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@ -315,40 +315,27 @@ void schedule_console_callback(void)
schedule_work(&console_work);
}
static void scrup(struct vc_data *vc, unsigned int t, unsigned int b,
unsigned int nr)
static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
enum con_scroll dir, unsigned int nr)
{
unsigned short *d, *s;
u16 *clear, *d, *s;
if (t+nr >= b)
if (t + nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
return;
d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
if (dir == SM_UP) {
clear = s + (b - t - nr) * vc->vc_cols;
swap(s, d);
}
scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
vc->vc_size_row * nr);
}
static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b,
unsigned int nr)
{
unsigned short *s;
unsigned int step;
if (t+nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
return;
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
step = vc->vc_cols * nr;
scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
}
static void do_update_region(struct vc_data *vc, unsigned long start, int count)
@ -1117,7 +1104,7 @@ static void lf(struct vc_data *vc)
* if below scrolling region
*/
if (vc->vc_y + 1 == vc->vc_bottom)
scrup(vc, vc->vc_top, vc->vc_bottom, 1);
con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
else if (vc->vc_y < vc->vc_rows - 1) {
vc->vc_y++;
vc->vc_pos += vc->vc_size_row;
@ -1132,7 +1119,7 @@ static void ri(struct vc_data *vc)
* if above scrolling region
*/
if (vc->vc_y == vc->vc_top)
scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
else if (vc->vc_y > 0) {
vc->vc_y--;
vc->vc_pos -= vc->vc_size_row;
@ -1628,7 +1615,7 @@ static void csi_L(struct vc_data *vc, unsigned int nr)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr = 1;
scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
vc->vc_need_wrap = 0;
}
@ -1649,7 +1636,7 @@ static void csi_M(struct vc_data *vc, unsigned int nr)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr=1;
scrup(vc, vc->vc_y, vc->vc_bottom, nr);
con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
vc->vc_need_wrap = 0;
}