cregit-Linux how code gets into the kernel

Release 4.12 include/linux/vt_buffer.h

Directory: include/linux
/*
 *      include/linux/vt_buffer.h -- Access to VT screen buffer
 *
 *      (c) 1998 Martin Mares <mj@ucw.cz>
 *
 *      This is a set of macros and functions which are used in the
 *      console driver and related code to access the screen buffer.
 *      In most cases the console works with simple in-memory buffer,
 *      but when handling hardware text mode consoles, we store
 *      the foreground console directly in video memory.
 */

#ifndef _LINUX_VT_BUFFER_H_

#define _LINUX_VT_BUFFER_H_


#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
#include <asm/vga.h>
#endif

#ifndef VT_BUF_HAVE_RW

#define scr_writew(val, addr) (*(addr) = (val))

#define scr_readw(addr) (*(addr))
#endif

#ifndef VT_BUF_HAVE_MEMSETW

static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) { count /= 2; while (count--) scr_writew(c, s++); }

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#endif #ifndef VT_BUF_HAVE_MEMCPYW
static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) { count /= 2; while (count--) scr_writew(scr_readw(s++), d++); }

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Linus Torvalds (pre-git)41100.00%3100.00%
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#endif #ifndef VT_BUF_HAVE_MEMMOVEW
static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) { if (d < s) scr_memcpyw(d, s, count); else { count /= 2; d += count; s += count; while (count--) scr_writew(scr_readw(--s), --d); } }

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Linus Torvalds (pre-git)67100.00%3100.00%
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#endif #endif

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Directory: include/linux
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