diff options
Diffstat (limited to 'kernel/include/linux/vt_buffer.h')
| -rw-r--r-- | kernel/include/linux/vt_buffer.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/include/linux/vt_buffer.h b/kernel/include/linux/vt_buffer.h new file mode 100644 index 000000000..f38c10ba3 --- /dev/null +++ b/kernel/include/linux/vt_buffer.h @@ -0,0 +1,59 @@ +/* + * 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++); +} +#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 |