| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * include/linux/vt_buffer.h -- Access to VT screen buffer |
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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 | * This is a set of macros and functions which are used in the |
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| 8 | * console driver and related code to access the screen buffer. |
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| 9 | * In most cases the console works with simple in-memory buffer, |
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| 10 | * but when handling hardware text mode consoles, we store |
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| 11 | * the foreground console directly in video memory. |
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| 12 | */ |
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| 13 | |
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| 14 | #ifndef _LINUX_VT_BUFFER_H_ |
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| 15 | #define _LINUX_VT_BUFFER_H_ |
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| 16 | |
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| 17 | #include <linux/string.h> |
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| 18 | |
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| 19 | #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE) |
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| 20 | #include <asm/vga.h> |
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| 21 | #endif |
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| 22 | |
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| 23 | #ifndef VT_BUF_HAVE_RW |
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| 24 | #define scr_writew(val, addr) (*(addr) = (val)) |
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| 25 | #define scr_readw(addr) (*(addr)) |
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| 26 | #endif |
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| 27 | |
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| 28 | #ifndef VT_BUF_HAVE_MEMSETW |
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| 29 | static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) |
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| 30 | { |
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| 31 | memset16(s, v: c, n: count / 2); |
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| 32 | } |
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| 33 | #endif |
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| 34 | |
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| 35 | #ifndef VT_BUF_HAVE_MEMCPYW |
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| 36 | static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) |
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| 37 | { |
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| 38 | memcpy(d, s, count); |
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| 39 | } |
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| 40 | #endif |
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| 41 | |
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| 42 | #ifndef VT_BUF_HAVE_MEMMOVEW |
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| 43 | static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) |
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| 44 | { |
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| 45 | memmove(d, s, count); |
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| 46 | } |
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| 47 | #endif |
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| 48 | |
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| 49 | #endif |
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| 50 | |
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