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Diffstat (limited to 'c/src/lib/libbsp/powerpc/ppcn_60x/console/vga.c')
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diff --git a/c/src/lib/libbsp/powerpc/ppcn_60x/console/vga.c b/c/src/lib/libbsp/powerpc/ppcn_60x/console/vga.c
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+/*
+ * This file contains the TTY driver for VGA
+ *
+ * COPYRIGHT (c) 1998 by Radstone Technology
+ *
+ *
+ * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY
+ * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK
+ * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU.
+ *
+ * You are hereby granted permission to use, copy, modify, and distribute
+ * this file, provided that this notice, plus the above copyright notice
+ * and disclaimer, appears in all copies. Radstone Technology will provide
+ * no support for this code.
+ *
+ * This driver uses the termios pseudo driver.
+ */
+/*-------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is based on:
+| outch.c,v 1.4 1995/12/19 20:07:27 joel Exp - go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. *
+| * On-Line Applications Research Corporation (OAR). *
+| * All rights assigned to U.S. Government, 1994. *
+| * *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013. This *
+| * notice must appear in all copies of this file and its derivatives. *
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+
+#include <bsp.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "vga_p.h"
+
+/*-------------------------------------------------------------------------+
+| Constants
++--------------------------------------------------------------------------*/
+#define DISPLAY_CELL_COUNT (VGA_NUM_ROWS * VGA_NUM_COLS)
+ /* Number of display cells. */
+#define TABSIZE 4 /* Number of spaces for TAB (\t) char. */
+#define WHITE 0x0007 /* White on Black background colour. */
+#define BLANK (WHITE | (' '<<8)) /* Blank character. */
+
+/*
+ * This is imported from i8042.c to provide flow control
+ */
+extern volatile boolean bScrollLock;
+
+/*-------------------------------------------------------------------------+
+| Global Variables
++--------------------------------------------------------------------------*/
+/* Physical address of start of video text memory. */
+static unsigned16 *videoRam = (unsigned16 *)VGA_FB;
+/* Pointer for current output position in display. */
+static unsigned16 *videoRamPtr = (unsigned16 *)VGA_FB;
+static unsigned8 videoRows = VGA_NUM_ROWS; /* Number of rows in display. */
+static unsigned8 videoCols = VGA_NUM_COLS; /* Number of columns in display. */
+static unsigned8 cursRow = 0; /* Current cursor row. */
+static unsigned8 cursCol = 0; /* Current cursor column. */
+
+
+/*-------------------------------------------------------------------------+
+| Function: setHardwareCursorPos
+| Description: Set hardware video cursor at given offset into video RAM.
+| Global Variables: None.
+| Arguments: videoCursor - Offset into video memory.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+setHardwareCursorPos(unsigned16 videoCursor)
+{
+ VGA_WRITE_CRTC(0x0e, (videoCursor >> 8) & 0xff);
+ VGA_WRITE_CRTC(0x0f, videoCursor & 0xff);
+} /* setHardwareCursorPos */
+
+
+/*-------------------------------------------------------------------------+
+| Function: updateVideoRamPtr
+| Description: Updates value of global variable "videoRamPtr" based on
+| current window's cursor position.
+| Global Variables: videoRamPtr, cursRow, cursCol.
+| Arguments: None.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+updateVideoRamPtr(void)
+{
+ videoRamPtr = videoRam + cursRow * videoCols + cursCol;
+} /* updateVideoRamPtr */
+
+
+/*-------------------------------------------------------------------------+
+| Function: scrollUp
+| Description: Scrolls display up n lines.
+| Global Variables: None.
+| Arguments: lines - number of lines to scroll.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static void
+scrollUp(unsigned8 lines)
+{
+ /* Number of blank display cells on bottom of window. */
+ unsigned16 blankCount;
+
+ /* Source and destination pointers for memory copy operations. */
+ unsigned16 *ptrDst, *ptrSrc;
+
+ if(lines<videoRows) /* Move window's contents up. */
+ {
+ /*
+ * Number of non-blank cells on upper part
+ * of display (total - blank).
+ */
+ unsigned16 nonBlankCount;
+
+ blankCount = lines * videoCols;
+ nonBlankCount = DISPLAY_CELL_COUNT - blankCount;
+ ptrSrc = videoRam + blankCount;
+ ptrDst = videoRam;
+
+ while(nonBlankCount--)
+ {
+ *ptrDst++ = *ptrSrc++;
+ }
+ }
+ else
+ {
+ /*
+ * Clear the whole display.
+ */
+ blankCount = DISPLAY_CELL_COUNT;
+ ptrDst = videoRam;
+ }
+
+ /* Fill bottom with blanks. */
+ while (blankCount-->0)
+ {
+ *ptrDst++ = BLANK;
+ }
+} /* scrollUp */
+
+
+/*-------------------------------------------------------------------------+
+| Function: printCHAR
+| Description: Print printable character to display.
+| Global Variables: videoRamPtr, cursRow, cursCol.
+| Arguments: c - character to write to display.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static void
+printCHAR(char c)
+{
+ *videoRamPtr++ = (c<<8) | WHITE;
+ cursCol++;
+ if(cursCol==videoCols)
+ {
+ cursCol = 0;
+ cursRow++;
+ if(cursRow==videoRows)
+ {
+ cursRow--;
+ scrollUp(1);
+ videoRamPtr -= videoCols;
+ }
+ }
+} /* printCHAR */
+
+/*-------------------------------------------------------------------------+
+| Function: printBS
+| Description: Print BS (BackSpace - '\b') character to display.
+| Global Variables: videoRamPtr, cursRow, cursCol.
+| Arguments: None.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+printBS(void)
+{
+ /* Move cursor back one cell. */
+ if(cursCol>0)
+ {
+ cursCol--;
+ }
+ else if(cursRow>0)
+ {
+ cursRow--;
+ cursCol = videoCols - 1;
+ }
+ else
+ {
+ return;
+ }
+
+ /* Write a whitespace. */
+ *(--videoRamPtr) = BLANK;
+} /* printBS */
+
+
+/*-------------------------------------------------------------------------+
+| Function: printHT
+| Description: Print HT (Horizontal Tab - '\t') character to display.
+| Global Variables: cursCol.
+| Arguments: None.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+printHT(void)
+{
+ do
+ {
+ printCHAR(' ');
+ }
+ while (cursCol % TABSIZE);
+} /* printHT */
+
+
+/*-------------------------------------------------------------------------+
+| Function: printLF
+| Description: Print LF (Line Feed - '\n') character to display.
+| Global Variables: cursRow.
+| Arguments: None.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+printLF(void)
+{
+ cursRow++;
+ if(cursRow==videoRows)
+ {
+ cursRow--;
+ scrollUp(1);
+ }
+ updateVideoRamPtr();
+} /* printLF */
+
+
+/*-------------------------------------------------------------------------+
+| Function: printCR
+| Description: Print CR (Carriage Return - '\r') to display.
+| Global Variables: cursCol.
+| Arguments: None.
+| Returns: Nothing.
++--------------------------------------------------------------------------*/
+static inline void
+printCR(void)
+{
+ cursCol = 0;
+ updateVideoRamPtr();
+} /* printCR */
+
+/*
+ * Console Device Driver Entry Points
+ */
+void
+vga_write(
+ int minor,
+ char cChar)
+{
+ switch (cChar)
+ {
+ case '\b':
+ printBS();
+ break;
+ case '\t':
+ printHT();
+ break;
+ case '\n':
+ printLF();
+ break;
+ case '\r':
+ printCR();
+ break;
+ default:
+ printCHAR(cChar);
+ break;
+ }
+
+ setHardwareCursorPos(videoRamPtr - videoRam);
+} /* vga_write */
+
+/*
+ * vga_write_support
+ *
+ * Console Termios output entry point.
+ *
+ */
+int vga_write_support(
+ int minor,
+ const char *buf,
+ int len
+)
+{
+ int nwrite = 0;
+
+ while(bScrollLock)
+ {
+ /*
+ * The Scroll lock on the keyboard is active
+ */
+ /*
+ * Yield while we wait
+ */
+ rtems_task_wake_after(RTEMS_YIELD_PROCESSOR);
+ }
+
+ /*
+ * Write each byte in the string to the display
+ */
+ while (nwrite<len)
+ {
+ /*
+ * transmit character
+ */
+ vga_write(minor, *buf++);
+ nwrite++;
+ }
+
+ /*
+ * return the number of bytes written.
+ */
+ return nwrite;
+}
+
+boolean vga_probe(int minor)
+{
+ unsigned8 ucMiscIn;
+
+ /*
+ * Check for presence of VGA adaptor
+ */
+ inport_byte(0x3cc, ucMiscIn);
+ if(ucMiscIn!=0xff)
+ {
+ /*
+ * VGA device is present
+ */
+ return(TRUE);
+ }
+ return(FALSE);
+}
+
+void vga_init(int minor)
+{
+ scrollUp(videoRows); /* Clear entire screen */
+ setHardwareCursorPos(0); /* Cursor at upper left corner */
+ /*
+ * Enable the cursor
+ */
+ VGA_WRITE_CRTC(0x0a, 0x0e); /* Crt cursor start */
+}
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