23487998fa
- emulate VGA read mode 0, - emulate VGA write mode 1, - minor cleanup. Protel's Easytrax, a free PCB layout program, almost runs now; there are still some problems with the keyboard emulation, but the graphics are fine (albeit a bit slow).
378 lines
12 KiB
C
378 lines
12 KiB
C
/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI video.h,v 2.2 1996/04/08 19:33:12 bostic Exp
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*
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* $FreeBSD$
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*/
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/*
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* The VGA CRT Controller
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*/
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extern u_int8_t VGA_CRTC[];
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/* CRTC registers
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We use the VGA register functions and don't care about the MDA. We also
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leave out the undocumented registers at 0x22, 0x24, 0x3?. */
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#define CRTC_HorzTotal 0x00
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#define CRTC_HorzDispEnd 0x01
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#define CRTC_StartHorzBlank 0x02
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#define CRTC_EndHorzBlank 0x03
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#define CRTC_StartHorzRetrace 0x04
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#define CRTC_EndHorzRetrace 0x05
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#define CRTC_VertTotal 0x06
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#define CRTC_Overflow 0x07
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#define CRTC_ResetRowScan 0x08
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#define CRTC_MaxScanLine 0x09
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#define CRTC_CursStart 0x0a
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#define CRTC_CursEnd 0x0b
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#define CRTC_StartAddrHi 0x0c
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#define CRTC_StartAddrLo 0x0d
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#define CRTC_CurLocHi 0x0e
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#define CRTC_CurLocLo 0x0f
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#define CRTC_StartVertRetrace 0x10
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#define CRTC_EndVertRetrace 0x11
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#define CRTC_VertDispEnd 0x12
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#define CRTC_Offset 0x13
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#define CRTC_UnderlineLoc 0x14
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#define CRTC_StartVertBlank 0x15
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#define CRTC_EndVertBlank 0x16
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#define CRTC_ModeCtrl 0x17
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#define CRTC_LineCompare 0x18
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#define CRTC_Size 0x19
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/* Port addresses for the CRTC
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The registers are read by
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OUT index_port, reg_nr
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IN data_port, res
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They are written by
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OUT index_port, reg_nr
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OUT data_port, value
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*/
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#define CRTC_IndexPortColor 0x03d4 /* CRTC Address Register (Color) */
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#define CRTC_DataPortColor 0x03d5 /* CRTC Data Register (Color) */
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#define CRTC_IndexPortMono 0x03b4 /* CRTC Address Register (Mono) */
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#define CRTC_DataPortMono 0x03b5 /* CRTC Data Register (Mono) */
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/*
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* VGA Attribute Controller
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*/
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extern u_int8_t VGA_ATC[];
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/* ATC registers
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The palette registers are here for completeness. We'll always use a
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separate array 'palette[]' to access them in our code. */
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#define ATC_Palette0 0x00
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#define ATC_Palette1 0x01
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#define ATC_Palette2 0x02
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#define ATC_Palette3 0x03
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#define ATC_Palette4 0x04
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#define ATC_Palette5 0x05
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#define ATC_Palette6 0x06
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#define ATC_Palette7 0x07
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#define ATC_Palette8 0x08
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#define ATC_Palette9 0x09
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#define ATC_PaletteA 0x0a
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#define ATC_PaletteB 0x0b
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#define ATC_PaletteC 0x0c
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#define ATC_PaletteD 0x0d
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#define ATC_PaletteE 0x0e
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#define ATC_PaletteF 0x0f
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#define ATC_ModeCtrl 0x10
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#define ATC_OverscanColor 0x11
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#define ATC_ColorPlaneEnable 0x12
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#define ATC_HorzPixelPanning 0x13
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#define ATC_ColorSelect 0x14
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#define ATC_Size 0x15
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/* Port addresses for the ATC
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The ATC has a combined index/data port at 0x03c0. To quote from Ralf
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Brown's ports list: ``Every write access to this register will toggle an
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internal index/data selection flipflop, so that consecutive writes to index
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& data is possible through this port. To get a defined start condition,
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each read access to the input status register #1 (3BAh in mono / 3DAh in
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color) resets the flipflop to load index.'' */
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#define ATC_WritePort 0x03c0
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#define ATC_ReadPort 0x03c1
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/*
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* VGA Sequencer Controller
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*/
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extern u_int8_t VGA_TSC[];
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/* TSC registers
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We leave out the undocumented register at 0x07. */
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#define TSC_Reset 0x00
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#define TSC_ClockingMode 0x01
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#define TSC_MapMask 0x02
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#define TSC_CharMapSelect 0x03
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#define TSC_MemoryMode 0x04
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#define TSC_Size 0x05
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/* Port addresses for the TSC */
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#define TSC_IndexPort 0x03c4
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#define TSC_DataPort 0x03c5
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/*
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* VGA Graphics Controller
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*/
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extern u_int8_t VGA_GDC[];
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/* GDC registers */
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#define GDC_SetReset 0x00
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#define GDC_EnableSetReset 0x01
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#define GDC_ColorCompare 0x02
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#define GDC_DataRotate 0x03
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#define GDC_ReadMapSelect 0x04
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#define GDC_Mode 0x05
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#define GDC_Misc 0x06
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#define GDC_ColorDontCare 0x07
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#define GDC_BitMask 0x08
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#define GDC_Size 0x09
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/* Port addresses for the GDC */
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#define GDC_IndexPort 0x03ce
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#define GDC_DataPort 0x03cf
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/*
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* Miscellaneous VGA registers
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*/
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u_int8_t VGA_InputStatus0;
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u_int8_t VGA_InputStatus1;
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u_int8_t VGA_MiscOutput;
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u_int8_t VGA_DAC_PELData;
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u_int8_t VGA_DAC_PELMask;
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u_int8_t VGA_DAC_PELReadAddr;
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u_int8_t VGA_DAC_PELWriteAddr;
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u_int8_t VGA_DAC_State;
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/* Port addresses for miscellaneous VGA registers */
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#define VGA_InputStatus0Port 0x03c2 /* Read-only */
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#define VGA_InputStatus1Port 0x03da /* Read-only */
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#define VGA_MiscOutputPortW 0x03c2 /* Write-only */
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#define VGA_MiscOutputPortR 0x03cc /* Read-only */
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/* Port addresses for VGA DAC registers */
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#define VGA_DAC_PELDataPort 0x03c9 /* Read/Write */
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#define VGA_DAC_PELMaskPort 0x03c6 /* Read/Write */
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#define VGA_DAC_PELReadAddrPort 0x03c7 /* Write-only */
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#define VGA_DAC_PELWriteAddrPort 0x03c8 /* Read/Write */
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#define VGA_DAC_StatePortOut 0x03c7 /* Read-only */
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/*
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* Additional variables and type definitions
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*/
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/* To ease access to the palette registers, 'palette[]' will overlay the
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Attribute Controller space. */
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u_int8_t *palette;
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/* Entry type for the DAC table. Each value is actually 6 bits wide. */
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struct dac_colors {
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u_int8_t red;
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u_int8_t green;
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u_int8_t blue;
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};
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/* We need a working copy of the default DAC table. This is filled from
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'dac_default{64,256}[]' in 'video.c:init_vga()'. */
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struct dac_colors *dac_rgb;
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/*
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* Video memory
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*
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* The video memory of a standard VGA card is 256K. For the standard modes,
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* this is divided into four planes of 64K which are accessed according to the
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* GDC state. Mode 0x13 will also fit within 64K. The higher resolution modes
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* (VESA) require a bit more sophistication; we leave that for later
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* implementation.
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*/
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/* Video RAM */
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u_int8_t *vram;
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/* Pointers to the four bit planes */
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u_int8_t *vplane0;
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u_int8_t *vplane1;
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u_int8_t *vplane2;
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u_int8_t *vplane3;
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/* Pointer to the video memory. The base address varies with the video mode.
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'vmem' is used directly only in the text modes; in the graphics modes, all
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writes go to 'vram'. */
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u_int16_t *vmem;
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/*
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* VGA status information
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*
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* Int 10:1b returns a 64 byte block of status info for the VGA card. This
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* block also contains a couple of BIOS variables, so we will use it for
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* general housekeeping.
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*/
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extern u_int8_t vga_status[];
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/* Access to the VGA status fields. */
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#define StaticFuncTbl *(u_int32_t *)&vga_status[0]
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#define VideoMode *(u_int8_t *)&vga_status[4]
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#define DpyCols *(u_int16_t *)&vga_status[5]
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#define DpyPageSize *(u_int16_t *)&vga_status[7]
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#define ActivePageOfs *(u_int16_t *)&vga_status[9]
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#define CursCol0 *(u_int8_t *)&vga_status[11]
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#define CursRow0 *(u_int8_t *)&vga_status[12]
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#define CursCol1 *(u_int8_t *)&vga_status[13]
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#define CursRow1 *(u_int8_t *)&vga_status[14]
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#define CursCol2 *(u_int8_t *)&vga_status[15]
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#define CursRow2 *(u_int8_t *)&vga_status[16]
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#define CursCol3 *(u_int8_t *)&vga_status[17]
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#define CursRow3 *(u_int8_t *)&vga_status[18]
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#define CursCol4 *(u_int8_t *)&vga_status[19]
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#define CursRow4 *(u_int8_t *)&vga_status[20]
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#define CursCol5 *(u_int8_t *)&vga_status[21]
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#define CursRow5 *(u_int8_t *)&vga_status[22]
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#define CursCol6 *(u_int8_t *)&vga_status[23]
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#define CursRow6 *(u_int8_t *)&vga_status[24]
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#define CursCol7 *(u_int8_t *)&vga_status[25]
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#define CursRow7 *(u_int8_t *)&vga_status[26]
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#define CursStart *(u_int8_t *)&vga_status[27]
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#define CursEnd *(u_int8_t *)&vga_status[28]
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#define ActivePage *(u_int8_t *)&vga_status[29]
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#define CRTCPort *(u_int16_t *)&vga_status[30]
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#define CGA_ModeCtrl *(u_int8_t *)&vga_status[32]
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#define CGA_ColorSelect *(u_int8_t *)&vga_status[33]
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#define DpyRows *(u_int8_t *)&vga_status[34]
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#define CharHeight *(u_int16_t *)&vga_status[35]
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#define ActiveDCC *(u_int8_t *)&vga_status[37]
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#define SecondDCC *(u_int8_t *)&vga_status[38]
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#define NumColors *(u_int16_t *)&vga_status[39]
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#define NumPages *(u_int8_t *)&vga_status[41]
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#define VertResolution *(u_int8_t *)&vga_status[42]
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#define PrimaryCharset *(u_int8_t *)&vga_status[43]
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#define SecondaryCharset *(u_int8_t *)&vga_status[44]
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#define MiscStatus *(u_int8_t *)&vga_status[45]
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/*
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#define Reserved1 *(u_int16_t *)&vga_status[46]
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#define Reserved2 *(u_int8_t *)&vga_status[48]
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*/
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#define VMemSize *(u_int8_t *)&vga_status[49]
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#define SavePointerStatus *(u_int8_t *)&vga_status[50]
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/* VGA Static Functionality Table
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This table contains mode-independent VGA status information. It is actually
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defined in 'vparam.h'; the declaration here is just for completeness. */
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extern u_int8_t static_functionality_tbl[];
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/* Add some names for the VGA related BIOS variables. */
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#define BIOS_VideoMode *(u_int8_t *)&BIOSDATA[0x49]
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#define BIOS_DpyCols *(u_int16_t *)&BIOSDATA[0x4a]
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#define BIOS_DpyPageSize *(u_int16_t *)&BIOSDATA[0x4c]
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#define BIOS_ActivePageOfs *(u_int16_t *)&BIOSDATA[0x4e]
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#define BIOS_CursCol0 *(u_int8_t *)&BIOSDATA[0x50]
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#define BIOS_CursRow0 *(u_int8_t *)&BIOSDATA[0x51]
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#define BIOS_CursCol1 *(u_int8_t *)&BIOSDATA[0x52]
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#define BIOS_CursRow1 *(u_int8_t *)&BIOSDATA[0x53]
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#define BIOS_CursCol2 *(u_int8_t *)&BIOSDATA[0x54]
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#define BIOS_CursRow2 *(u_int8_t *)&BIOSDATA[0x55]
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#define BIOS_CursCol3 *(u_int8_t *)&BIOSDATA[0x56]
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#define BIOS_CursRow3 *(u_int8_t *)&BIOSDATA[0x57]
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#define BIOS_CursCol4 *(u_int8_t *)&BIOSDATA[0x58]
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#define BIOS_CursRow4 *(u_int8_t *)&BIOSDATA[0x59]
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#define BIOS_CursCol5 *(u_int8_t *)&BIOSDATA[0x5a]
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#define BIOS_CursRow5 *(u_int8_t *)&BIOSDATA[0x5b]
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#define BIOS_CursCol6 *(u_int8_t *)&BIOSDATA[0x5c]
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#define BIOS_CursRow6 *(u_int8_t *)&BIOSDATA[0x5d]
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#define BIOS_CursCol7 *(u_int8_t *)&BIOSDATA[0x5e]
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#define BIOS_CursRow7 *(u_int8_t *)&BIOSDATA[0x5f]
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#define BIOS_CursStart *(u_int8_t *)&BIOSDATA[0x60]
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#define BIOS_CursEnd *(u_int8_t *)&BIOSDATA[0x61]
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#define BIOS_ActivePage *(u_int8_t *)&BIOSDATA[0x62]
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#define BIOS_CRTCPort *(u_int16_t *)&BIOSDATA[0x63]
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#define BIOS_CGA_ModeCtrl *(u_int8_t *)&BIOSDATA[0x65]
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#define BIOS_CGA_ColorSelect *(u_int8_t *)&BIOSDATA[0x66]
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#define BIOS_DpyRows *(u_int8_t *)&BIOSDATA[0x84]
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#define BIOS_CharHeight *(u_int16_t *)&BIOSDATA[0x85]
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#define BIOS_SaveTablePointer *(u_int32_t *)&BIOSDATA[0xa8]
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/*
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* Video modes
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*
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* This started as a big 'switch' statement in 'video.c:init_mode()' which
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* soon became too ugly and unmanagable. So, we collect all mode related
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* information in one table and define a couple of helper function to access
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* it. This will also benefit the VESA support, whenever we get to that.
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*/
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typedef struct {
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int modenumber; /* Mode number */
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int paramindex; /* Index into the parameter table */
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int type; /* Text or Graphics */
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int numcolors; /* Number of colors */
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int numpages; /* Number of display pages */
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int vrescode; /* 0 = 200, 1 = 350, 2 = 400, 3 = 480 */
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u_int32_t vmemaddr; /* Video memory address */
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char *fontname; /* Font name */
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} vmode_t;
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/* Types. 'NOMODE' is one of the 'forbidden' internal modes. */
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#define TEXT 0
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#define GRAPHICS 1
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#define NOMODE -1
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extern vmode_t vmodelist[];
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/* Font names */
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#define FONTVGA "vga"
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#define FONT8x8 "vga8x8"
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#define FONT8x14 "vga8x14"
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#define FONT8x16 "vga8x16" /* same as FONTVGA */
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/* External functions in 'video.c'. */
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void init_mode(int);
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int find_vmode(int);
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u_int8_t vga_read(u_int32_t);
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void vga_write(u_int32_t, u_int8_t);
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void video_bios_init(void);
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void video_init(void);
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int vmem_pageflt(struct sigframe *);
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/* Other external variables, mostly from tty.c. Needs to be cleaned up. */
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extern int vattr;
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void write_vram(void *);
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