patch-2.1.109 linux/include/linux/vt_buffer.h

• Lines: 78
• Date: Thu Jul 16 15:11:40 1998
• Orig file: v2.1.108/linux/include/linux/vt_buffer.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.108/linux/include/linux/vt_buffer.h linux/include/linux/vt_buffer.h
@@ -0,0 +1,77 @@
+/*
+ *	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>
+
+#ifdef CONFIG_VGA_CONSOLE
+#if !defined(CONFIG_FB) && !defined(CONFIG_FB_MODULE)
+#define VT_BUF_VRAM_ONLY
+#endif
+#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 VT_BUF_HAVE_MEMCPYW
+#define scr_memcpyw_from(d, s, c) memcpy(d, s, c)
+#define scr_memcpyw_to(d, s, c) memcpy(d, s, c)
+#define VT_BUF_HAVE_MEMCPYF
+#endif
+
+#ifndef VT_BUF_HAVE_MEMSETW
+extern 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
+extern inline void scr_memcpyw(u16 *d, u16 *s, unsigned int count)
+{
+	count /= 2;
+	while (count--)
+		scr_writew(scr_readw(s++), d++);
+}
+#endif
+
+#ifndef VT_BUF_HAVE_MEMCPYF
+extern inline void scr_memcpyw_from(u16 *d, u16 *s, unsigned int count)
+{
+	count /= 2;
+	while (count--)
+		*d++ = scr_readw(s++);
+}
+
+extern inline void scr_memcpyw_to(u16 *d, u16 *s, unsigned int count)
+{
+	count /= 2;
+	while (count--)
+		scr_writew(*s++, d++);
+}
+#endif
+
+#define reverse_video_char(a)	(((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77))
+#define reverse_video_short(a)	(((a) & 0x88ff) | \
+	(((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4))
+/* this latter line used to have masks 0xf000 and 0x0f00, but selection
+   requires a self-inverse operation; moreover, the old version looks wrong */
+#define reverse_video_short_mono(a)	((a) ^ 0x800)
+#define complement_video_short(a)	((a) ^ (can_do_color ? 0x7700 : 0x800))
+
+#endif