1/* 2 * Access to VGA videoram 3 * 4 * (c) 1998 Martin Mares <mj@ucw.cz> 5 */ 6#ifndef _ASM_VGA_H 7#define _ASM_VGA_H 8 9#include <asm/addrspace.h> 10#include <asm/byteorder.h> 11 12/* 13 * On the PC, we can just recalculate addresses and then 14 * access the videoram directly without any black magic. 15 */ 16 17#define VGA_MAP_MEM(x, s) CKSEG1ADDR(0x10000000L + (unsigned long)(x)) 18 19#define vga_readb(x) (*(x)) 20#define vga_writeb(x, y) (*(y) = (x)) 21 22#define VT_BUF_HAVE_RW 23/* 24 * These are only needed for supporting VGA or MDA text mode, which use little 25 * endian byte ordering. 26 * In other cases, we can optimize by using native byte ordering and 27 * <linux/vt_buffer.h> has already done the right job for us. 28 */ 29 30#undef scr_writew 31#undef scr_readw 32 33static inline void scr_writew(u16 val, volatile u16 *addr) 34{ 35 *addr = cpu_to_le16(val); 36} 37 38static inline u16 scr_readw(volatile const u16 *addr) 39{ 40 return le16_to_cpu(*addr); 41} 42 43#define scr_memcpyw(d, s, c) memcpy(d, s, c) 44#define scr_memmovew(d, s, c) memmove(d, s, c) 45#define VT_BUF_HAVE_MEMCPYW 46#define VT_BUF_HAVE_MEMMOVEW 47 48#endif /* _ASM_VGA_H */ 49