1 files changed, 64 insertions, 0 deletions
diff --git a/include/linux/vt_buffer.h b/include/linux/vt_buffer.h
new file mode 100644
index 000000000000..1f7ba3629053
--- /dev/null
+++ b/include/linux/vt_buffer.h
@@ -0,0 +1,64 @@
+/*
+ *	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_
+
+#include <linux/config.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