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1da177e4 LT |
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 | #include <linux/config.h> | |
17 | ||
18 | #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE) | |
19 | #include <asm/vga.h> | |
20 | #endif | |
21 | ||
22 | #ifndef VT_BUF_HAVE_RW | |
23 | #define scr_writew(val, addr) (*(addr) = (val)) | |
24 | #define scr_readw(addr) (*(addr)) | |
25 | #define scr_memcpyw(d, s, c) memcpy(d, s, c) | |
26 | #define scr_memmovew(d, s, c) memmove(d, s, c) | |
27 | #define VT_BUF_HAVE_MEMCPYW | |
28 | #define VT_BUF_HAVE_MEMMOVEW | |
29 | #endif | |
30 | ||
31 | #ifndef VT_BUF_HAVE_MEMSETW | |
32 | static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) | |
33 | { | |
34 | count /= 2; | |
35 | while (count--) | |
36 | scr_writew(c, s++); | |
37 | } | |
38 | #endif | |
39 | ||
40 | #ifndef VT_BUF_HAVE_MEMCPYW | |
41 | static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) | |
42 | { | |
43 | count /= 2; | |
44 | while (count--) | |
45 | scr_writew(scr_readw(s++), d++); | |
46 | } | |
47 | #endif | |
48 | ||
49 | #ifndef VT_BUF_HAVE_MEMMOVEW | |
50 | static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) | |
51 | { | |
52 | if (d < s) | |
53 | scr_memcpyw(d, s, count); | |
54 | else { | |
55 | count /= 2; | |
56 | d += count; | |
57 | s += count; | |
58 | while (count--) | |
59 | scr_writew(scr_readw(--s), --d); | |
60 | } | |
61 | } | |
62 | #endif | |
63 | ||
64 | #endif |