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/byteorder.h> 10 11 /* 12 * On the PC, we can just recalculate addresses and then 13 * access the videoram directly without any black magic. 14 */ 15 16 #define VGA_MAP_MEM(x, s) (0xb0000000L + (unsigned long)(x)) 17 18 #define vga_readb(x) (*(x)) 19 #define vga_writeb(x, y) (*(y) = (x)) 20 21 #define VT_BUF_HAVE_RW 22 /* 23 * These are only needed for supporting VGA or MDA text mode, which use little 24 * endian byte ordering. 25 * In other cases, we can optimize by using native byte ordering and 26 * <linux/vt_buffer.h> has already done the right job for us. 27 */ 28 29 #undef scr_writew 30 #undef scr_readw 31 32 static inline void scr_writew(u16 val, volatile u16 *addr) 33 { 34 *addr = cpu_to_le16(val); 35 } 36 37 static inline u16 scr_readw(volatile const u16 *addr) 38 { 39 return le16_to_cpu(*addr); 40 } 41 42 #define scr_memcpyw(d, s, c) memcpy(d, s, c) 43 #define scr_memmovew(d, s, c) memmove(d, s, c) 44 #define VT_BUF_HAVE_MEMCPYW 45 #define VT_BUF_HAVE_MEMMOVEW 46 47 #endif /* _ASM_VGA_H */ 48