mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 19:53:59 +08:00
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
|
|
* 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))
|
|
#define scr_memcpyw(d, s, c) memcpy(d, s, c)
|
|
#define scr_memmovew(d, s, c) memmove(d, s, c)
|
|
#define VT_BUF_HAVE_MEMCPYW
|
|
#define VT_BUF_HAVE_MEMMOVEW
|
|
#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++);
|
|
}
|
|
#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++);
|
|
}
|
|
#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);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#endif
|