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 65