文件操作 - vga.h
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文件: /usr/src/linux-headers-5.15.0-186/arch/x86/include/asm/vga.h
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/* SPDX-License-Identifier: GPL-2.0 */ /* * Access to VGA videoram * * (c) 1998 Martin Mares <mj@ucw.cz> */ #ifndef _ASM_X86_VGA_H #define _ASM_X86_VGA_H #include <asm/set_memory.h> /* * On the PC, we can just recalculate addresses and then * access the videoram directly without any black magic. * To support memory encryption however, we need to access * the videoram as decrypted memory. */ #define VGA_MAP_MEM(x, s) \ ({ \ unsigned long start = (unsigned long)phys_to_virt(x); \ \ if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) \ set_memory_decrypted(start, (s) >> PAGE_SHIFT); \ \ start; \ }) #define vga_readb(x) (*(x)) #define vga_writeb(x, y) (*(y) = (x)) #endif /* _ASM_X86_VGA_H */
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