1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Access to VGA videoram
4 *
5 * (c) 1998 Martin Mares <mj@ucw.cz>
6 */
7
8 #ifndef _ASM_X86_VGA_H
9 #define _ASM_X86_VGA_H
10
11 #include <asm/set_memory.h>
12
13 /*
14 * On the PC, we can just recalculate addresses and then
15 * access the videoram directly without any black magic.
16 * To support memory encryption however, we need to access
17 * the videoram as decrypted memory.
18 */
19
20 #define VGA_MAP_MEM(x, s) \
21 ({ \
22 unsigned long start = (unsigned long)phys_to_virt(x); \
23 \
24 if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) \
25 set_memory_decrypted(start, (s) >> PAGE_SHIFT); \
26 \
27 start; \
28 })
29
30 #define vga_readb(x) (*(x))
31 #define vga_writeb(x, y) (*(y) = (x))
32
33 #endif /* _ASM_X86_VGA_H */