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Commit 66da39eb authored by Manuel Schölling's avatar Manuel Schölling Committed by Greg Kroah-Hartman
Browse files

console: Move scrollback data into its own struct 



This refactoring is in preparation for persistent scrollback
support for VGA console.

Signed-off-by: default avatarManuel Schölling <manuel.schoelling@gmx.de>
Reviewed-by: default avatarAndrey Utkin <andrey_utkin@fastmail.com>
Tested-by: default avatarAndrey Utkin <andrey_utkin@fastmail.com>
Tested-by: default avatarAdam Borowski <kilobyte@angband.pl>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4e0f5cc6

drivers/video/console/vgacon.c

+47 −44
Original line number Diff line number Diff line
@@ -162,31 +162,34 @@ static inline void vga_set_mem_top(struct vc_data *c) 


#ifdef CONFIG_VGACON_SOFT_SCROLLBACK

/* software scrollback */

static void *vgacon_scrollback;

static int vgacon_scrollback_tail;

static int vgacon_scrollback_size;

static int vgacon_scrollback_rows;

static int vgacon_scrollback_cnt;

static int vgacon_scrollback_cur;

static int vgacon_scrollback_save;

static int vgacon_scrollback_restore;

static struct vgacon_scrollback_info {

	void *data;

	int tail;

	int size;

	int rows;

	int cnt;

	int cur;

	int save;

	int restore;

} vgacon_scrollback;



static void vgacon_scrollback_init(int pitch)

{

	int rows = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024/pitch;



	if (vgacon_scrollback) {

		vgacon_scrollback_cnt  = 0;

		vgacon_scrollback_tail = 0;

		vgacon_scrollback_cur  = 0;

		vgacon_scrollback_rows = rows - 1;

		vgacon_scrollback_size = rows * pitch;

	if (vgacon_scrollback.data) {

		vgacon_scrollback.cnt  = 0;

		vgacon_scrollback.tail = 0;

		vgacon_scrollback.cur  = 0;

		vgacon_scrollback.rows = rows - 1;

		vgacon_scrollback.size = rows * pitch;

	}

}



static void vgacon_scrollback_startup(void)

{

	vgacon_scrollback = kcalloc(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE, 1024, GFP_NOWAIT);

	vgacon_scrollback.data = kcalloc(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE,

		1024, GFP_NOWAIT);

	vgacon_scrollback_init(vga_video_num_columns * 2);

}
@@ -194,38 +197,38 @@ static void vgacon_scrollback_update(struct vc_data *c, int t, int count) 
{

	void *p;



	if (!vgacon_scrollback_size || c->vc_num != fg_console)

	if (!vgacon_scrollback.size || c->vc_num != fg_console)

		return;



	p = (void *) (c->vc_origin + t * c->vc_size_row);



	while (count--) {

		scr_memcpyw(vgacon_scrollback + vgacon_scrollback_tail,

		scr_memcpyw(vgacon_scrollback.data + vgacon_scrollback.tail,

			    p, c->vc_size_row);

		vgacon_scrollback_cnt++;

		vgacon_scrollback.cnt++;

		p += c->vc_size_row;

		vgacon_scrollback_tail += c->vc_size_row;

		vgacon_scrollback.tail += c->vc_size_row;



		if (vgacon_scrollback_tail >= vgacon_scrollback_size)

			vgacon_scrollback_tail = 0;

		if (vgacon_scrollback.tail >= vgacon_scrollback.size)

			vgacon_scrollback.tail = 0;



		if (vgacon_scrollback_cnt > vgacon_scrollback_rows)

			vgacon_scrollback_cnt = vgacon_scrollback_rows;

		if (vgacon_scrollback.cnt > vgacon_scrollback.rows)

			vgacon_scrollback.cnt = vgacon_scrollback.rows;



		vgacon_scrollback_cur = vgacon_scrollback_cnt;

		vgacon_scrollback.cur = vgacon_scrollback.cnt;

	}

}



static void vgacon_restore_screen(struct vc_data *c)

{

	vgacon_scrollback_save = 0;

	vgacon_scrollback.save = 0;



	if (!vga_is_gfx && !vgacon_scrollback_restore) {

	if (!vga_is_gfx && !vgacon_scrollback.restore) {

		scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,

			    c->vc_screenbuf_size > vga_vram_size ?

			    vga_vram_size : c->vc_screenbuf_size);

		vgacon_scrollback_restore = 1;

		vgacon_scrollback_cur = vgacon_scrollback_cnt;

		vgacon_scrollback.restore = 1;

		vgacon_scrollback.cur = vgacon_scrollback.cnt;

	}

}
@@ -239,41 +242,41 @@ static void vgacon_scrolldelta(struct vc_data *c, int lines) 
		return;

	}



	if (!vgacon_scrollback)

	if (!vgacon_scrollback.data)

		return;



	if (!vgacon_scrollback_save) {

	if (!vgacon_scrollback.save) {

		vgacon_cursor(c, CM_ERASE);

		vgacon_save_screen(c);

		vgacon_scrollback_save = 1;

		vgacon_scrollback.save = 1;

	}



	vgacon_scrollback_restore = 0;

	start = vgacon_scrollback_cur + lines;

	vgacon_scrollback.restore = 0;

	start = vgacon_scrollback.cur + lines;

	end = start + abs(lines);



	if (start < 0)

		start = 0;



	if (start > vgacon_scrollback_cnt)

		start = vgacon_scrollback_cnt;

	if (start > vgacon_scrollback.cnt)

		start = vgacon_scrollback.cnt;



	if (end < 0)

		end = 0;



	if (end > vgacon_scrollback_cnt)

		end = vgacon_scrollback_cnt;

	if (end > vgacon_scrollback.cnt)

		end = vgacon_scrollback.cnt;



	vgacon_scrollback_cur = start;

	vgacon_scrollback.cur = start;

	count = end - start;

	soff = vgacon_scrollback_tail - ((vgacon_scrollback_cnt - end) *

	soff = vgacon_scrollback.tail - ((vgacon_scrollback.cnt - end) *

					 c->vc_size_row);

	soff -= count * c->vc_size_row;



	if (soff < 0)

		soff += vgacon_scrollback_size;

		soff += vgacon_scrollback.size;



	count = vgacon_scrollback_cnt - start;

	count = vgacon_scrollback.cnt - start;



	if (count > c->vc_rows)

		count = c->vc_rows;
@@ -287,13 +290,13 @@ static void vgacon_scrolldelta(struct vc_data *c, int lines) 


		count *= c->vc_size_row;

		/* how much memory to end of buffer left? */

		copysize = min(count, vgacon_scrollback_size - soff);

		scr_memcpyw(d, vgacon_scrollback + soff, copysize);

		copysize = min(count, vgacon_scrollback.size - soff);

		scr_memcpyw(d, vgacon_scrollback.data + soff, copysize);

		d += copysize;

		count -= copysize;



		if (count) {

			scr_memcpyw(d, vgacon_scrollback, count);

			scr_memcpyw(d, vgacon_scrollback.data, count);

			d += count;

		}