Import code for article1, 2, 3, 4

1 files changed, 98 insertions, 0 deletions

diff --git a/sos-code-article4/drivers/x86_videomem.h b/sos-code-article4/drivers/x86_videomem.h
new file mode 100644
index 0000000..31a9dfc
--- /dev/null
+++ b/sos-code-article4/drivers/x86_videomem.h
@@ -0,0 +1,98 @@
+/* Copyright (C) 2004  David Decotigny
+   Copyright (C) 1999  Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA. 
+*/
+#ifndef _SOS_X86_VIDEOMEM_H_
+#define _SOS_X86_VIDEOMEM_H_
+
+/**
+ * @file x86_videomem.h
+ *
+ * On x86 PC platforms, the text mode screen memory (and CGA/EGA/VGA
+ * too) is mapped into physical memory. This file handles access to
+ * this screen, supposed to be set in text-mode, through this memory
+ * area. All the functions below print the characters directly to the
+ * memory, without interpreting the escaped characters (such as \n,
+ * \r...)
+ */
+
+#include <sos/errno.h>
+
+/**
+ * x86 video attributes
+ * See http://webster.cs.ucr.edu/AoA/DOS/ch23/CH23-1.html
+ */
+/* Normal and Dark/Light foreground */
+#define SOS_X86_VIDEO_FG_BLACK     0
+#define SOS_X86_VIDEO_FG_DKGRAY    8
+#define SOS_X86_VIDEO_FG_BLUE      1
+#define SOS_X86_VIDEO_FG_LTBLUE    9
+#define SOS_X86_VIDEO_FG_GREEN     2
+#define SOS_X86_VIDEO_FG_LTGREEN   10
+#define SOS_X86_VIDEO_FG_CYAN      3
+#define SOS_X86_VIDEO_FG_LTCYAN    11
+#define SOS_X86_VIDEO_FG_RED       4
+#define SOS_X86_VIDEO_FG_LTRED     12
+#define SOS_X86_VIDEO_FG_MAGENTA   5
+#define SOS_X86_VIDEO_FG_LTMAGENTA 13
+#define SOS_X86_VIDEO_FG_BROWN     6
+#define SOS_X86_VIDEO_FG_YELLOW    14
+#define SOS_X86_VIDEO_FG_LTGRAY    7
+#define SOS_X86_VIDEO_FG_WHITE     15
+/* Background */
+#define SOS_X86_VIDEO_BG_BLACK     (0 << 4)
+#define SOS_X86_VIDEO_BG_BLUE      (1 << 4)
+#define SOS_X86_VIDEO_BG_GREEN     (2 << 4)
+#define SOS_X86_VIDEO_BG_CYAN      (3 << 4)
+#define SOS_X86_VIDEO_BG_RED       (4 << 4)
+#define SOS_X86_VIDEO_BG_MAGENTA   (5 << 4)
+#define SOS_X86_VIDEO_BG_BROWN     (6 << 4)
+#define SOS_X86_VIDEO_BG_LTGRAY    (7 << 4)
+/* Blinking */
+#define SOS_X86_VIDEO_FG_BLINKING  (1 << 7)
+
+
+/** Setup the video RAM mapping and clear the screen */
+sos_ret_t sos_x86_videomem_setup(void);
+
+/** Clears the screen and set the background color as given by
+    attribute */
+sos_ret_t sos_x86_videomem_cls(unsigned char attribute);
+
+/** Print the string on the scren with the given attribute. Does not
+    handle scrolling */
+sos_ret_t sos_x86_videomem_putstring(unsigned char row, unsigned char col,
+				     unsigned char attribute,
+				     const char *str);
+
+/** Print the character on the scren with the given attribute. Does not
+    handle scrolling */
+sos_ret_t sos_x86_videomem_putchar(unsigned char row, unsigned char col,
+				   unsigned char attribute,
+				   unsigned char c);
+
+/**
+ * Print the formatted string. Very restricted version of printf(3):
+ * 1/ can print max 255 chars, 2/ supports only %d/%i, %c, %s, %x
+ * without any support for flag charachters (eg %08x).
+ */
+sos_ret_t sos_x86_videomem_printf(unsigned char row, unsigned char col,
+				  unsigned char attribute,
+				  const char *format, /* args */...)
+     __attribute__ ((format (printf, 4, 5)));
+
+#endif /* _SOS_X86_VIDEOMEM_H_ */