tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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) (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
29static inline void scr_writew(u16 val, volatile u16 *addr)
30{
31 *addr = cpu_to_le16(val);
32}
33
34static inline u16 scr_readw(volatile const u16 *addr)
35{
36 return le16_to_cpu(*addr);
37}
38
39#define scr_memcpyw(d, s, c) memcpy(d, s, c)
40#define scr_memmovew(d, s, c) memmove(d, s, c)
41#define VT_BUF_HAVE_MEMCPYW
42#define VT_BUF_HAVE_MEMMOVEW
43
44#endif /* _ASM_VGA_H */