📄 vga.c

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/*
nexOS: vga.c - SVGA driver
Copyright 2004 nexOS development team

This file is part of nexOS.

nexOS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

nexOS 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with nexOS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/ 

#include "vga.h"
#include "kernel/io/io.h"
#include "kernel/mem/kmemmgr.h"

#include <stdlib.h>

/* mode register */
const unsigned char g_40x25_text[61] =
{
/* MISC */
	0x67,
/* SEQ */
	0x03, 0x08, 0x03, 0x00, 0x02,
/* CRTC */
	0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F,
	0x00, 0x4F, 0x0D, 0x0E, 0x00, 0x00, 0x00, 0xA0,
	0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00,
};
const unsigned char g_40x50_text[61] =
{
/* MISC */
	0x67,
/* SEQ */
	0x03, 0x08, 0x03, 0x00, 0x02,
/* CRTC */
	0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F,
	0x00, 0x47, 0x06, 0x07, 0x00, 0x00, 0x04, 0x60,
	0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00,
};
const unsigned char g_80x25_text[61] =
{
/* MISC */
	0x67,
/* SEQ */
	0x03, 0x00, 0x03, 0x00, 0x02,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F,
	0x00, 0x4F, 0x0D, 0x0E, 0x00, 0x00, 0x00, 0x50,
	0x9C, 0x0E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00
};
const unsigned char g_80x50_text[61] =
{
/* MISC */
	0x67,
/* SEQ */
	0x03, 0x00, 0x03, 0x00, 0x02,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F,
	0x00, 0x47, 0x06, 0x07, 0x00, 0x00, 0x01, 0x40,
	0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
	0xFF, 
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF, 
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00,
};
const unsigned char g_90x30_text[61] =
{
/* MISC */
	0xE7,
/* SEQ */
	0x03, 0x01, 0x03, 0x00, 0x02,
/* CRTC */
	0x6B, 0x59, 0x5A, 0x82, 0x60, 0x8D, 0x0B, 0x3E,
	0x00, 0x4F, 0x0D, 0x0E, 0x00, 0x00, 0x00, 0x00,
	0xEA, 0x0C, 0xDF, 0x2D, 0x10, 0xE8, 0x05, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00,
};
const unsigned char g_90x60_text[61] =
{
/* MISC */
	0xE7,
/* SEQ */
	0x03, 0x01, 0x03, 0x00, 0x02,
/* CRTC */
	0x6B, 0x59, 0x5A, 0x82, 0x60, 0x8D, 0x0B, 0x3E,
	0x00, 0x47, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00,
	0xEA, 0x0C, 0xDF, 0x2D, 0x08, 0xE8, 0x05, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x0E, 0x00,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x0C, 0x00, 0x0F, 0x08, 0x00,
};
const unsigned char g_640x480x2[61] =
{
/* MISC */
	0xE3,
/* SEQ */
	0x03, 0x01, 0x0F, 0x00, 0x06,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E,
	0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xEA, 0x0C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0F,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x01, 0x00, 0x0F, 0x00, 0x00
};
const unsigned char g_320x200x4[61] =
{
/* MISC */
	0x63,
/* SEQ */
	0x03, 0x09, 0x03, 0x00, 0x02,
/* CRTC */
	0x2D, 0x27, 0x28, 0x90, 0x2B, 0x80, 0xBF, 0x1F,
	0x00, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x9C, 0x0E, 0x8F, 0x14, 0x00, 0x96, 0xB9, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x02, 0x00,
	0xFF,
/* AC */
	0x00, 0x13, 0x15, 0x17, 0x02, 0x04, 0x06, 0x07,
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	0x01, 0x00, 0x03, 0x00, 0x00
};

const unsigned char g_640x480x16[61] =
{
/* MISC */
	0xE3,
/* SEQ */
	0x03, 0x01, 0x08, 0x00, 0x06,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E,
	0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xEA, 0x0C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x05, 0x0F,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
	0x01, 0x00, 0x0F, 0x00, 0x00
};

const unsigned char g_720x480x16[61] =
{
/* MISC */
	0xE7,
/* SEQ */
	0x03, 0x01, 0x08, 0x00, 0x06,
/* CRTC */
	0x6B, 0x59, 0x5A, 0x82, 0x60, 0x8D, 0x0B, 0x3E,
	0x00, 0x40, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00,
	0xEA, 0x0C, 0xDF, 0x2D, 0x08, 0xE8, 0x05, 0xE3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x05, 0x0F,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
	0x01, 0x00, 0x0F, 0x00, 0x00,
};

const unsigned char g_320x200x256[61] =
{
/* MISC */
	0x63,
/* SEQ */
	0x03, 0x01, 0x0F, 0x00, 0x0E,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F,
	0x00, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x9C, 0x0E, 0x8F, 0x28,	0x40, 0x96, 0xB9, 0xA3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x05, 0x0F,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
	0x41, 0x00, 0x0F, 0x00,	0x00
};

const unsigned char g_320x200x256_modex[61] =
{
/* MISC */
	0xE3,
/* SEQ */
	0x03, 0x01, 0x0F, 0x00, 0x06,
/* CRTC */
	0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F,
	0x00, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x9C, 0x0E, 0x8F, 0x28, 0x00, 0x96, 0xB9, 0xE3,
	0xFF,
/* GC */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x05, 0x0F,
	0xFF,
/* AC */
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
	0x41, 0x00, 0x0F, 0x00, 0x00
};

/* global vars */
int vga_actmode;
unsigned char vga_oldmoderegs[61];
unsigned char vga_oldpalette[256][3];

/* predeclared functions */
/* helper functions */
void vga_write_regs(const unsigned char *regs);
void *vga_get_fb_addr(void);
void vga_set_plane(unsigned p);
void vpokeb(int off, char v);
char vpeekb(int off);

/* mode specific functions */
void vga_setpal8(const unsigned char *pal);

void vga_setpalentry8(BYTE index, BYTE r, BYTE g, BYTE b);

void vga_write_pixel1(unsigned x, unsigned y, unsigned c);
void vga_write_pixel2(unsigned x, unsigned y, unsigned c);
void vga_write_pixel4p(unsigned x, unsigned y, unsigned c);
void vga_write_pixel8p(unsigned x, unsigned y, unsigned c);
void vga_write_pixel8(unsigned x, unsigned y, unsigned c);
void vga_write_pixel8x(unsigned x, unsigned y, unsigned c);

#define VGA_CREATEMODE(w,h,d,pp,sp,spe,i) {w,h,d,pp,sp,spe,i}

const VGAMODE vga_modes[12] = {
    VGA_CREATEMODE(40,25,0,0,0,0,g_40x25_text),
    VGA_CREATEMODE(40,50,0,0,0,0,g_40x50_text),
    VGA_CREATEMODE(80,25,0,0,0,0,g_80x25_text),
    VGA_CREATEMODE(40,50,0,0,0,0,g_80x50_text),
    VGA_CREATEMODE(90,30,0,0,0,0,g_90x30_text),
    VGA_CREATEMODE(90,30,0,0,0,0,g_90x60_text),
    
    VGA_CREATEMODE(640,480,1,vga_write_pixel1,vga_setpal8,vga_setpalentry8,g_640x480x2), /* testing */
    VGA_CREATEMODE(320,200,2,vga_write_pixel2,vga_setpal8,vga_setpalentry8,g_320x200x4),
    VGA_CREATEMODE(640,480,4,vga_write_pixel4p,vga_setpal8,vga_setpalentry8,g_640x480x16),
    VGA_CREATEMODE(720,480,4,vga_write_pixel4p,vga_setpal8,vga_setpalentry8,g_720x480x16), /* testing */
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💿 文件大小 108 K
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