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/*

 *      include/linux/vt_buffer.h -- Access to VT screen buffer

 *

 *      (c) 1998 Martin Mares <mj@ucw.cz>

 *

 *      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/config.h>

#if defined(CONFIG_VGA_CONSOLE) || defined(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))

#define scr_memcpyw(d, s, c) memcpy(d, s, c)

#define scr_memmovew(d, s, c) memmove(d, s, c)

#define VT_BUF_HAVE_MEMCPYW

#define VT_BUF_HAVE_MEMMOVEW

#endif

#ifndef VT_BUF_HAVE_MEMSETW

static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)

{

        count /= 2;

        while (count--)

                scr_writew(c, s++);

}

#endif

#ifndef VT_BUF_HAVE_MEMCPYW

static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)

{

        count /= 2;

        while (count--)

                scr_writew(scr_readw(s++), d++);

}

#endif

#ifndef VT_BUF_HAVE_MEMMOVEW

static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)

{

        if (d < s)

                scr_memcpyw(d, s, count);

        else {

                count /= 2;

                d += count;

                s += count;

                while (count--)

                        scr_writew(scr_readw(--s), --d);

        }

}

#endif

#endif