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/* SPDX-License-Identifier: GPL-2.0 */ /* * include/linux/vt_buffer.h -- Access to VT screen buffer * * (c) 1998 Martin Mares <[email protected]> * * This is a set of macros and functions which are used in the * console driver and related code to access the screen buffer. * In most cases the console works with simple in-memory buffer, * but when handling hardware text mode consoles, we store * the foreground console directly in video memory. */ #ifndef _LINUX_VT_BUFFER_H_ #define _LINUX_VT_BUFFER_H_ #include <linux/string.h> #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE) #include <asm/vga.h> #endif #ifndef VT_BUF_HAVE_RW #define scr_writew(val, addr) (*(addr) = (val)) #define scr_readw(addr) (*(addr)) #endif #ifndef VT_BUF_HAVE_MEMSETW static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) { #ifdef VT_BUF_HAVE_RW count /= 2; while (count--) scr_writew(c, s++); #else memset16(s, c, count / 2); #endif } #endif #ifndef VT_BUF_HAVE_MEMCPYW static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) { #ifdef VT_BUF_HAVE_RW count /= 2; while (count--) scr_writew(scr_readw(s++), d++); #else memcpy(d, s, count); #endif } #endif #ifndef VT_BUF_HAVE_MEMMOVEW static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) { #ifdef VT_BUF_HAVE_RW if (d < s) scr_memcpyw(d, s, count); else { count /= 2; d += count; s += count; while (count--) scr_writew(scr_readw(--s), --d); } #else memmove(d, s, count); #endif } #endif #endif