cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vt_buffer.h (1524B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 *	include/linux/vt_buffer.h -- Access to VT screen buffer
      4 *
      5 *	(c) 1998 Martin Mares <mj@ucw.cz>
      6 *
      7 *	This is a set of macros and functions which are used in the
      8 *	console driver and related code to access the screen buffer.
      9 *	In most cases the console works with simple in-memory buffer,
     10 *	but when handling hardware text mode consoles, we store
     11 *	the foreground console directly in video memory.
     12 */
     13
     14#ifndef _LINUX_VT_BUFFER_H_
     15#define _LINUX_VT_BUFFER_H_
     16
     17#include <linux/string.h>
     18
     19#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
     20#include <asm/vga.h>
     21#endif
     22
     23#ifndef VT_BUF_HAVE_RW
     24#define scr_writew(val, addr) (*(addr) = (val))
     25#define scr_readw(addr) (*(addr))
     26#endif
     27
     28#ifndef VT_BUF_HAVE_MEMSETW
     29static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
     30{
     31#ifdef VT_BUF_HAVE_RW
     32	count /= 2;
     33	while (count--)
     34		scr_writew(c, s++);
     35#else
     36	memset16(s, c, count / 2);
     37#endif
     38}
     39#endif
     40
     41#ifndef VT_BUF_HAVE_MEMCPYW
     42static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
     43{
     44#ifdef VT_BUF_HAVE_RW
     45	count /= 2;
     46	while (count--)
     47		scr_writew(scr_readw(s++), d++);
     48#else
     49	memcpy(d, s, count);
     50#endif
     51}
     52#endif
     53
     54#ifndef VT_BUF_HAVE_MEMMOVEW
     55static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
     56{
     57#ifdef VT_BUF_HAVE_RW
     58	if (d < s)
     59		scr_memcpyw(d, s, count);
     60	else {
     61		count /= 2;
     62		d += count;
     63		s += count;
     64		while (count--)
     65			scr_writew(scr_readw(--s), --d);
     66	}
     67#else
     68	memmove(d, s, count);
     69#endif
     70}
     71#endif
     72
     73#endif