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 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 #endif 25 26 #ifndef VT_BUF_HAVE_MEMSETW 27 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) 28 { 29 count /= 2; 30 while (count--) 31 scr_writew(c, s++); 32 } 33 #endif 34 35 #ifndef VT_BUF_HAVE_MEMCPYW 36 static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) 37 { 38 count /= 2; 39 while (count--) 40 scr_writew(scr_readw(s++), d++); 41 } 42 #endif 43 44 #ifndef VT_BUF_HAVE_MEMMOVEW 45 static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) 46 { 47 if (d < s) 48 scr_memcpyw(d, s, count); 49 else { 50 count /= 2; 51 d += count; 52 s += count; 53 while (count--) 54 scr_writew(scr_readw(--s), --d); 55 } 56 } 57 #endif 58 59 #endif 60