vga.h

来自「ARM 嵌入式 系统 设计与实例开发 实验教材 二源码」· C头文件 代码 · 共 52 行

/*
 *	Access to VGA videoram
 *
 *	(c) 1998 Martin Mares <[e-mail]>
 */

#ifndef _LINUX_ASM_VGA_H_
#define _LINUX_ASM_VGA_H_

#include <asm/io.h>

#define VT_BUF_HAVE_RW
#define VT_BUF_HAVE_MEMSETW
#define VT_BUF_HAVE_MEMCPYW

extern inline void scr_writew(u16 val, volatile u16 *addr)
{
	if (__is_ioaddr((unsigned long) addr))
		__raw_writew(val, (unsigned long) addr);
	else
		*addr = val;
}

extern inline u16 scr_readw(volatile const u16 *addr)
{
	if (__is_ioaddr((unsigned long) addr))
		return __raw_readw((unsigned long) addr);
	else
		return *addr;
}

extern inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
{
	if (__is_ioaddr((unsigned long) s))
		memsetw_io(s, c, count);
	else
		memsetw(s, c, count);
}

/* Do not trust that the usage will be correct; analyze the arguments.  */
extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);

/* ??? These are currently only used for downloading character sets.  As
   such, they don't need memory barriers.  Is this all they are intended
   to be used for?  */
#define vga_readb	readb
#define vga_writeb	writeb

#define VGA_MAP_MEM(x)	((unsigned long) ioremap((x), 0))

#endif