1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* 1 /*
3 * include/linux/vt_buffer.h -- Access to 2 * include/linux/vt_buffer.h -- Access to VT screen buffer
4 * 3 *
5 * (c) 1998 Martin Mares <mj@ucw.cz> 4 * (c) 1998 Martin Mares <mj@ucw.cz>
6 * 5 *
7 * This is a set of macros and functions 6 * This is a set of macros and functions which are used in the
8 * console driver and related code to acc 7 * console driver and related code to access the screen buffer.
9 * In most cases the console works with s 8 * In most cases the console works with simple in-memory buffer,
10 * but when handling hardware text mode c 9 * but when handling hardware text mode consoles, we store
11 * the foreground console directly in vid 10 * the foreground console directly in video memory.
12 */ 11 */
13 12
14 #ifndef _LINUX_VT_BUFFER_H_ 13 #ifndef _LINUX_VT_BUFFER_H_
15 #define _LINUX_VT_BUFFER_H_ 14 #define _LINUX_VT_BUFFER_H_
16 15
17 #include <linux/string.h> <<
18 16
19 #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABL !! 17 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
20 #include <asm/vga.h> 18 #include <asm/vga.h>
21 #endif 19 #endif
22 20
23 #ifndef VT_BUF_HAVE_RW 21 #ifndef VT_BUF_HAVE_RW
24 #define scr_writew(val, addr) (*(addr) = (val) 22 #define scr_writew(val, addr) (*(addr) = (val))
25 #define scr_readw(addr) (*(addr)) 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
26 #endif 28 #endif
27 29
28 #ifndef VT_BUF_HAVE_MEMSETW 30 #ifndef VT_BUF_HAVE_MEMSETW
29 static inline void scr_memsetw(u16 *s, u16 c, 31 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
30 { 32 {
31 #ifdef VT_BUF_HAVE_RW <<
32 count /= 2; 33 count /= 2;
33 while (count--) 34 while (count--)
34 scr_writew(c, s++); 35 scr_writew(c, s++);
35 #else <<
36 memset16(s, c, count / 2); <<
37 #endif <<
38 } 36 }
39 #endif 37 #endif
40 38
41 #ifndef VT_BUF_HAVE_MEMCPYW 39 #ifndef VT_BUF_HAVE_MEMCPYW
42 static inline void scr_memcpyw(u16 *d, const u 40 static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
43 { 41 {
44 #ifdef VT_BUF_HAVE_RW <<
45 count /= 2; 42 count /= 2;
46 while (count--) 43 while (count--)
47 scr_writew(scr_readw(s++), d++ 44 scr_writew(scr_readw(s++), d++);
48 #else <<
49 memcpy(d, s, count); <<
50 #endif <<
51 } 45 }
52 #endif 46 #endif
53 47
54 #ifndef VT_BUF_HAVE_MEMMOVEW 48 #ifndef VT_BUF_HAVE_MEMMOVEW
55 static inline void scr_memmovew(u16 *d, const 49 static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
56 { 50 {
57 #ifdef VT_BUF_HAVE_RW <<
58 if (d < s) 51 if (d < s)
59 scr_memcpyw(d, s, count); 52 scr_memcpyw(d, s, count);
60 else { 53 else {
61 count /= 2; 54 count /= 2;
62 d += count; 55 d += count;
63 s += count; 56 s += count;
64 while (count--) 57 while (count--)
65 scr_writew(scr_readw(- 58 scr_writew(scr_readw(--s), --d);
66 } 59 }
67 #else <<
68 memmove(d, s, count); <<
69 #endif <<
70 } 60 }
71 #endif 61 #endif
72 62
73 #endif 63 #endif
74 64
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