cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fbcon_rotate.c (2385B)

      1/*
      2 *  linux/drivers/video/console/fbcon_rotate.c -- Software Rotation
      3 *
      4 *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
      5 *
      6 *  This file is subject to the terms and conditions of the GNU General Public
      7 *  License.  See the file COPYING in the main directory of this archive for
      8 *  more details.
      9 */
     10
     11#include <linux/module.h>
     12#include <linux/slab.h>
     13#include <linux/string.h>
     14#include <linux/fb.h>
     15#include <linux/vt_kern.h>
     16#include <linux/console.h>
     17#include <asm/types.h>
     18#include "fbcon.h"
     19#include "fbcon_rotate.h"
     20
     21static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc)
     22{
     23	struct fbcon_ops *ops = info->fbcon_par;
     24	int len, err = 0;
     25	int s_cellsize, d_cellsize, i;
     26	const u8 *src;
     27	u8 *dst;
     28
     29	if (vc->vc_font.data == ops->fontdata &&
     30	    ops->p->con_rotate == ops->cur_rotate)
     31		goto finished;
     32
     33	src = ops->fontdata = vc->vc_font.data;
     34	ops->cur_rotate = ops->p->con_rotate;
     35	len = vc->vc_font.charcount;
     36	s_cellsize = ((vc->vc_font.width + 7)/8) *
     37		vc->vc_font.height;
     38	d_cellsize = s_cellsize;
     39
     40	if (ops->rotate == FB_ROTATE_CW ||
     41	    ops->rotate == FB_ROTATE_CCW)
     42		d_cellsize = ((vc->vc_font.height + 7)/8) *
     43			vc->vc_font.width;
     44
     45	if (info->fbops->fb_sync)
     46		info->fbops->fb_sync(info);
     47
     48	if (ops->fd_size < d_cellsize * len) {
     49		dst = kmalloc_array(len, d_cellsize, GFP_KERNEL);
     50
     51		if (dst == NULL) {
     52			err = -ENOMEM;
     53			goto finished;
     54		}
     55
     56		ops->fd_size = d_cellsize * len;
     57		kfree(ops->fontbuffer);
     58		ops->fontbuffer = dst;
     59	}
     60
     61	dst = ops->fontbuffer;
     62	memset(dst, 0, ops->fd_size);
     63
     64	switch (ops->rotate) {
     65	case FB_ROTATE_UD:
     66		for (i = len; i--; ) {
     67			rotate_ud(src, dst, vc->vc_font.width,
     68				  vc->vc_font.height);
     69
     70			src += s_cellsize;
     71			dst += d_cellsize;
     72		}
     73		break;
     74	case FB_ROTATE_CW:
     75		for (i = len; i--; ) {
     76			rotate_cw(src, dst, vc->vc_font.width,
     77				  vc->vc_font.height);
     78			src += s_cellsize;
     79			dst += d_cellsize;
     80		}
     81		break;
     82	case FB_ROTATE_CCW:
     83		for (i = len; i--; ) {
     84			rotate_ccw(src, dst, vc->vc_font.width,
     85				   vc->vc_font.height);
     86			src += s_cellsize;
     87			dst += d_cellsize;
     88		}
     89		break;
     90	}
     91
     92finished:
     93	return err;
     94}
     95
     96void fbcon_set_rotate(struct fbcon_ops *ops)
     97{
     98	ops->rotate_font = fbcon_rotate_font;
     99
    100	switch(ops->rotate) {
    101	case FB_ROTATE_CW:
    102		fbcon_rotate_cw(ops);
    103		break;
    104	case FB_ROTATE_UD:
    105		fbcon_rotate_ud(ops);
    106		break;
    107	case FB_ROTATE_CCW:
    108		fbcon_rotate_ccw(ops);
    109		break;
    110	}
    111}