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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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 | ||
ac036f95 | 17 | #include <linux/string.h> |
1da177e4 | 18 | |
bfff83c4 | 19 | #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE) |
1da177e4 LT |
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)) | |
1da177e4 LT |
26 | #endif |
27 | ||
28 | #ifndef VT_BUF_HAVE_MEMSETW | |
29 | static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) | |
30 | { | |
ac036f95 | 31 | #ifdef VT_BUF_HAVE_RW |
1da177e4 LT |
32 | count /= 2; |
33 | while (count--) | |
34 | scr_writew(c, s++); | |
ac036f95 MW |
35 | #else |
36 | memset16(s, c, count / 2); | |
37 | #endif | |
1da177e4 LT |
38 | } |
39 | #endif | |
40 | ||
41 | #ifndef VT_BUF_HAVE_MEMCPYW | |
42 | static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) | |
43 | { | |
ac036f95 | 44 | #ifdef VT_BUF_HAVE_RW |
1da177e4 LT |
45 | count /= 2; |
46 | while (count--) | |
47 | scr_writew(scr_readw(s++), d++); | |
ac036f95 MW |
48 | #else |
49 | memcpy(d, s, count); | |
50 | #endif | |
1da177e4 LT |
51 | } |
52 | #endif | |
53 | ||
54 | #ifndef VT_BUF_HAVE_MEMMOVEW | |
55 | static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) | |
56 | { | |
ac036f95 | 57 | #ifdef VT_BUF_HAVE_RW |
1da177e4 LT |
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 | } | |
ac036f95 MW |
67 | #else |
68 | memmove(d, s, count); | |
69 | #endif | |
1da177e4 LT |
70 | } |
71 | #endif | |
72 | ||
73 | #endif |