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/string.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 #endif 26 27 #ifndef VT_BUF_HAVE_MEMSETW 28 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) 29 { 30 #ifdef VT_BUF_HAVE_RW 31 count /= 2; 32 while (count--) 33 scr_writew(c, s++); 34 #else 35 memset16(s, c, count / 2); 36 #endif 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 #ifdef VT_BUF_HAVE_RW 44 count /= 2; 45 while (count--) 46 scr_writew(scr_readw(s++), d++); 47 #else 48 memcpy(d, s, count); 49 #endif 50 } 51 #endif 52 53 #ifndef VT_BUF_HAVE_MEMMOVEW 54 static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) 55 { 56 #ifdef VT_BUF_HAVE_RW 57 if (d < s) 58 scr_memcpyw(d, s, count); 59 else { 60 count /= 2; 61 d += count; 62 s += count; 63 while (count--) 64 scr_writew(scr_readw(--s), --d); 65 } 66 #else 67 memmove(d, s, count); 68 #endif 69 } 70 #endif 71 72 #endif 73