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Linux Cross Reference
Linux/include/linux/vt_buffer.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  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 static 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 static 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 static 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 static 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 static 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
 84
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