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 33 static inline void scr_writew(u16 val, volatile u16 *addr) 34 { 35 *addr = cpu_to_le16(val); 36 } 37 38 static 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