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73 lines
1.5 KiB
73 lines
1.5 KiB
/* 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 <[email protected]> |
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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 defined(CONFIG_VGA_CONSOLE) || defined(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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