vt_buffer.h

 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 IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(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	memset16(s, c, count / 2);
32}
33#endif
34
35#ifndef VT_BUF_HAVE_MEMCPYW
36static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
37{
38	memcpy(d, s, count);
39}
40#endif
41
42#ifndef VT_BUF_HAVE_MEMMOVEW
43static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
44{
45	memmove(d, s, count);
46}
47#endif
48
49#endif