Line data Source code
1 : /*
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 :
16 :
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
31 : static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
32 : {
33 168 : count /= 2;
34 504 : while (count--)
35 336 : scr_writew(c, s++);
36 168 : }
37 : #endif
38 :
39 : #ifndef VT_BUF_HAVE_MEMCPYW
40 : static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
41 84 : {
42 : count /= 2;
43 : while (count--)
44 : scr_writew(scr_readw(s++), d++);
45 : }
46 : #endif
47 :
48 : #ifndef VT_BUF_HAVE_MEMMOVEW
49 : static 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
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