74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/vt_buffer.h -- Access to VT screen buffer
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*
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* This is a set of macros and functions which are used in the
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* console driver and related code to access the screen buffer.
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* In most cases the console works with simple in-memory buffer,
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* but when handling hardware text mode consoles, we store
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* the foreground console directly in video memory.
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*/
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#ifndef _LINUX_VT_BUFFER_H_
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#define _LINUX_VT_BUFFER_H_
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#include <linux/string.h>
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#if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE)
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#include <asm/vga.h>
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#endif
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#ifndef VT_BUF_HAVE_RW
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#define scr_writew(val, addr) (*(addr) = (val))
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#define scr_readw(addr) (*(addr))
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#endif
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#ifndef VT_BUF_HAVE_MEMSETW
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static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
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{
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#ifdef VT_BUF_HAVE_RW
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count /= 2;
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while (count--)
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scr_writew(c, s++);
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#else
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memset16(s, c, count / 2);
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#endif
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}
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#endif
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#ifndef VT_BUF_HAVE_MEMCPYW
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static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
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{
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#ifdef VT_BUF_HAVE_RW
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count /= 2;
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while (count--)
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scr_writew(scr_readw(s++), d++);
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#else
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memcpy(d, s, count);
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#endif
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}
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#endif
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#ifndef VT_BUF_HAVE_MEMMOVEW
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static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
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{
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#ifdef VT_BUF_HAVE_RW
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if (d < s)
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scr_memcpyw(d, s, count);
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else {
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count /= 2;
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d += count;
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s += count;
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while (count--)
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scr_writew(scr_readw(--s), --d);
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}
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#else
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memmove(d, s, count);
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#endif
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}
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#endif
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#endif
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