1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Access to VGA videoram
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (c) 1998 Martin Mares <mj@ucw.cz>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #ifndef _ASM_VGA_H
8*4882a593Smuzhiyun #define _ASM_VGA_H
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/string.h>
11*4882a593Smuzhiyun #include <asm/addrspace.h>
12*4882a593Smuzhiyun #include <asm/byteorder.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /*
15*4882a593Smuzhiyun * On the PC, we can just recalculate addresses and then
16*4882a593Smuzhiyun * access the videoram directly without any black magic.
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define VGA_MAP_MEM(x, s) CKSEG1ADDR(0x10000000L + (unsigned long)(x))
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define vga_readb(x) (*(x))
22*4882a593Smuzhiyun #define vga_writeb(x, y) (*(y) = (x))
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define VT_BUF_HAVE_RW
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * These are only needed for supporting VGA or MDA text mode, which use little
27*4882a593Smuzhiyun * endian byte ordering.
28*4882a593Smuzhiyun * In other cases, we can optimize by using native byte ordering and
29*4882a593Smuzhiyun * <linux/vt_buffer.h> has already done the right job for us.
30*4882a593Smuzhiyun */
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun #undef scr_writew
33*4882a593Smuzhiyun #undef scr_readw
34*4882a593Smuzhiyun
scr_writew(u16 val,volatile u16 * addr)35*4882a593Smuzhiyun static inline void scr_writew(u16 val, volatile u16 *addr)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun *addr = cpu_to_le16(val);
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
scr_readw(volatile const u16 * addr)40*4882a593Smuzhiyun static inline u16 scr_readw(volatile const u16 *addr)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun return le16_to_cpu(*addr);
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
scr_memsetw(u16 * s,u16 v,unsigned int count)45*4882a593Smuzhiyun static inline void scr_memsetw(u16 *s, u16 v, unsigned int count)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun memset16(s, cpu_to_le16(v), count / 2);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun #define scr_memcpyw(d, s, c) memcpy(d, s, c)
51*4882a593Smuzhiyun #define scr_memmovew(d, s, c) memmove(d, s, c)
52*4882a593Smuzhiyun #define VT_BUF_HAVE_MEMCPYW
53*4882a593Smuzhiyun #define VT_BUF_HAVE_MEMMOVEW
54*4882a593Smuzhiyun #define VT_BUF_HAVE_MEMSETW
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun #endif /* _ASM_VGA_H */
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