projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * include/linux/vt_buffer.h -- Access to VT screen buffer | |
| 3 | * | |
| 4 | * (c) 1998 Martin Mares <[email protected]> | |
| 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 |