1/* 2 * include/linux/vt_buffer.h -- Access to VT screen buffer 3 * 4 * (c) 1998 Martin Mares <mj@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#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 32static 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 41static 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 50static 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