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 <linux/string.h> 10 #include <asm/addrspace.h> 11 #include <asm/byteorder.h> 12 13 /* 14 * On the PC, we can just recalculate addresses and then 15 * access the videoram directly without any black magic. 16 */ 17 18 #define VGA_MAP_MEM(x, s) CKSEG1ADDR(0x10000000L + (unsigned long)(x)) 19 20 #define vga_readb(x) (*(x)) 21 #define vga_writeb(x, y) (*(y) = (x)) 22 23 #define VT_BUF_HAVE_RW 24 /* 25 * These are only needed for supporting VGA or MDA text mode, which use little 26 * endian byte ordering. 27 * In other cases, we can optimize by using native byte ordering and 28 * <linux/vt_buffer.h> has already done the right job for us. 29 */ 30 31 #undef scr_writew 32 #undef scr_readw 33 34 static inline void scr_writew(u16 val, volatile u16 *addr) 35 { 36 *addr = cpu_to_le16(val); 37 } 38 39 static inline u16 scr_readw(volatile const u16 *addr) 40 { 41 return le16_to_cpu(*addr); 42 } 43 44 static inline void scr_memsetw(u16 *s, u16 v, unsigned int count) 45 { 46 memset16(s, cpu_to_le16(v), count / 2); 47 } 48 49 #define scr_memcpyw(d, s, c) memcpy(d, s, c) 50 #define scr_memmovew(d, s, c) memmove(d, s, c) 51 #define VT_BUF_HAVE_MEMCPYW 52 #define VT_BUF_HAVE_MEMMOVEW 53 #define VT_BUF_HAVE_MEMSETW 54 55 #endif /* _ASM_VGA_H */ 56