1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/linux/vt_buffer.h -- Access to VT screen buffer 4 * 5 * (c) 1998 Martin Mares <[email protected]> 6 * 7 * This is a set of macros and functions which are used in the 8 * console driver and related code to access the screen buffer. 9 * In most cases the console works with simple in-memory buffer, 10 * but when handling hardware text mode consoles, we store 11 * the foreground console directly in video memory. 12 */ 13 14 #ifndef _LINUX_VT_BUFFER_H_ 15 #define _LINUX_VT_BUFFER_H_ 16 17 #include <linux/string.h> 18 19 #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE) 20 #include <asm/vga.h> 21 #endif 22 23 #ifndef VT_BUF_HAVE_RW 24 #define scr_writew(val, addr) (*(addr) = (val)) 25 #define scr_readw(addr) (*(addr)) 26 #endif 27 28 #ifndef VT_BUF_HAVE_MEMSETW 29 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) 30 { 31 memset16(s, c, count / 2); 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 memcpy(d, s, count); 39 } 40 #endif 41 42 #ifndef VT_BUF_HAVE_MEMMOVEW 43 static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) 44 { 45 memmove(d, s, count); 46 } 47 #endif 48 49 #endif 50