| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |