arch/x86/include/asm/vga.h

   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 */