| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * Access to VGA videoram |
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| 4 | * |
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| 5 | * (c) 1998 Martin Mares <mj@ucw.cz> |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef _ASM_X86_VGA_H |
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| 9 | #define _ASM_X86_VGA_H |
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| 10 | |
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| 11 | #include <asm/set_memory.h> |
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| 12 | |
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| 13 | /* |
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| 14 | * On the PC, we can just recalculate addresses and then |
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| 15 | * access the videoram directly without any black magic. |
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| 16 | * To support memory encryption however, we need to access |
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| 17 | * the videoram as decrypted memory. |
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| 18 | */ |
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| 19 | |
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| 20 | #define VGA_MAP_MEM(x, s) \ |
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| 21 | ({ \ |
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| 22 | unsigned long start = (unsigned long)phys_to_virt(x); \ |
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| 23 | \ |
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| 24 | if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) \ |
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| 25 | set_memory_decrypted(start, (s) >> PAGE_SHIFT); \ |
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| 26 | \ |
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| 27 | start; \ |
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| 28 | }) |
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| 29 | |
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| 30 | #define vga_readb(x) (*(x)) |
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| 31 | #define vga_writeb(x, y) (*(y) = (x)) |
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| 32 | |
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| 33 | #endif /* _ASM_X86_VGA_H */ |
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| 34 | |
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