1 /* 2 * include/linux/vt_buffer.h -- Access to VT screen buffer 3 * 4 * (c) 1998 Martin Mares <mj (at) 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 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 #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 28 #endif 29 30 #ifndef VT_BUF_HAVE_MEMSETW 31 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) 32 { 33 count /= 2; 34 while (count--) 35 scr_writew(c, s++); 36 } 37 #endif 38 39 #ifndef VT_BUF_HAVE_MEMCPYW 40 static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) 41 { 42 count /= 2; 43 while (count--) 44 scr_writew(scr_readw(s++), d++); 45 } 46 #endif 47 48 #ifndef VT_BUF_HAVE_MEMMOVEW 49 static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) 50 { 51 if (d < s) 52 scr_memcpyw(d, s, count); 53 else { 54 count /= 2; 55 d += count; 56 s += count; 57 while (count--) 58 scr_writew(scr_readw(--s), --d); 59 } 60 } 61 #endif 62 63 #endif 64
