include/linux/vt_buffer.h

   1 /*
   2  *      include/linux/vt_buffer.h -- Access to VT screen buffer
   3  *
   4  *      (c) 1998 Martin Mares <mj@ucw.cz>
   5  *
   6  *      This is a set of macros and functions which are used in the
   7  *      console driver and related code to access the screen buffer.
   8  *      In most cases the console works with simple in-memory buffer,
   9  *      but when handling hardware text mode consoles, we store
  10  *      the foreground console directly in video memory.
  11  */
  12
  13 #ifndef _LINUX_VT_BUFFER_H_
  14 #define _LINUX_VT_BUFFER_H_
  15
  16 #include <linux/config.h>
  17
  18 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
  19 #include <asm/vga.h>
  20 #endif
  21
  22 #ifndef VT_BUF_HAVE_RW
  23 #define scr_writew(val, addr) (*(addr) = (val))
  24 #define scr_readw(addr) (*(addr))
  25 #define scr_memcpyw(d, s, c) memcpy(d, s, c)
  26 #define scr_memmovew(d, s, c) memmove(d, s, c)
  27 #define VT_BUF_HAVE_MEMCPYW
  28 #define VT_BUF_HAVE_MEMMOVEW
  29 #define scr_memcpyw_from(d, s, c) memcpy(d, s, c)
  30 #define scr_memcpyw_to(d, s, c) memcpy(d, s, c)
  31 #define VT_BUF_HAVE_MEMCPYF
  32 #endif
  33
  34 #ifndef VT_BUF_HAVE_MEMSETW
  35 extern inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
  36 {
  37         count /= 2;
  38         while (count--)
  39                 scr_writew(c, s++);
  40 }
  41 #endif
  42
  43 #ifndef VT_BUF_HAVE_MEMCPYW
  44 extern inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
  45 {
  46         count /= 2;
  47         while (count--)
  48                 scr_writew(scr_readw(s++), d++);
  49 }
  50 #endif
  51
  52 #ifndef VT_BUF_HAVE_MEMMOVEW
  53 extern inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
  54 {
  55         if (d < s)
  56                 scr_memcpyw(d, s, count);
  57         else {
  58                 count /= 2;
  59                 d += count;
  60                 s += count;
  61                 while (count--)
  62                         scr_writew(scr_readw(--s), --d);
  63         }
  64 }
  65 #endif
  66
  67 #ifndef VT_BUF_HAVE_MEMCPYF
  68 extern inline void scr_memcpyw_from(u16 *d, const u16 *s, unsigned int count)
  69 {
  70         count /= 2;
  71         while (count--)
  72                 *d++ = scr_readw(s++);
  73 }
  74
  75 extern inline void scr_memcpyw_to(u16 *d, const u16 *s, unsigned int count)
  76 {
  77         count /= 2;
  78         while (count--)
  79                 scr_writew(*s++, d++);
  80 }
  81 #endif
  82
  83 #endif