2 * Access to VGA videoram
4 * (c) 1998 Martin Mares <mj@ucw.cz>
9 #include <linux/string.h>
10 #include <asm/addrspace.h>
11 #include <asm/byteorder.h>
14 * On the PC, we can just recalculate addresses and then
15 * access the videoram directly without any black magic.
18 #define VGA_MAP_MEM(x, s) CKSEG1ADDR(0x10000000L + (unsigned long)(x))
20 #define vga_readb(x) (*(x))
21 #define vga_writeb(x, y) (*(y) = (x))
23 #define VT_BUF_HAVE_RW
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.
34 static inline void scr_writew(u16 val, volatile u16 *addr)
36 *addr = cpu_to_le16(val);
39 static inline u16 scr_readw(volatile const u16 *addr)
41 return le16_to_cpu(*addr);
44 static inline void scr_memsetw(u16 *s, u16 v, unsigned int count)
46 memset16(s, cpu_to_le16(v), count / 2);
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
55 #endif /* _ASM_VGA_H */