cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vga.h (740B)

      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 */