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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/linux/vt_buffer.h -- Access to VT screen buffer
3 *
4 * (c) 1998 Martin Mares <mj@ucw.cz>
5 *
6 * This is a set of macros and functions which are used in the
7 * console driver and related code to access the screen buffer.
8 * In most cases the console works with simple in-memory buffer,
9 * but when handling hardware text mode consoles, we store
10 * the foreground console directly in video memory.
11 */
12
13#ifndef _LINUX_VT_BUFFER_H_
14#define _LINUX_VT_BUFFER_H_
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
18#include <asm/vga.h>
19#endif
20
21#ifndef VT_BUF_HAVE_RW
22#define scr_writew(val, addr) (*(addr) = (val))
23#define scr_readw(addr) (*(addr))
24#define scr_memcpyw(d, s, c) memcpy(d, s, c)
25#define scr_memmovew(d, s, c) memmove(d, s, c)
26#define VT_BUF_HAVE_MEMCPYW
27#define VT_BUF_HAVE_MEMMOVEW
28#endif
29
30#ifndef VT_BUF_HAVE_MEMSETW
31static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
32{
33 count /= 2;
34 while (count--)
35 scr_writew(c, s++);
36}
37#endif
38
39#ifndef VT_BUF_HAVE_MEMCPYW
40static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
41{
42 count /= 2;
43 while (count--)
44 scr_writew(scr_readw(s++), d++);
45}
46#endif
47
48#ifndef VT_BUF_HAVE_MEMMOVEW
49static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
50{
51 if (d < s)
52 scr_memcpyw(d, s, count);
53 else {
54 count /= 2;
55 d += count;
56 s += count;
57 while (count--)
58 scr_writew(scr_readw(--s), --d);
59 }
60}
61#endif
62
63#endif