1991/1109/pc/vga.c (diff list | history)

1991/1107/sys/src/9/pc/vga.c:24,29 – 1991/1109/sys/src/9/pc/vga.c:24,32 (short | long | prev | next)
1991/0730		*/ #define MAXX 640 #define MAXY 480
1991/1109		#define XPERIOD 800 /* Hsync freq == 31.47 KHZ */ #define YPERIOD 525 /* Vsync freq == 59.9 HZ */ #define YBORDER 2
1991/0730		#define SCREENMEM (0xA0000 | KZERO)
1991/1107/sys/src/9/pc/vga.c:52,60 – 1991/1109/sys/src/9/pc/vga.c:55,69
1991/0727		Smmask= 0x02, /* map mask */ CRX= 0x3D4, /* index to crt registers */ CR= 0x3D5, /* crt registers */
1991/0928		Cvertend= 0x12, /* vertical display end */
1991/0727		Cmode= 0x17, /* mode register */
1991/1109		Cvt= 0x06, /* vertical total */ Cvover= 0x07, /* bits that didn't fit elsewhere */
1991/0727		Cmsl= 0x09, /* max scan line */
1991/1109		Cvrs= 0x10, /* vertical retrace start */ Cvre= 0x11, /* vertical retrace end */ Cvde= 0x12, /* vertical display end */ Cvbs= 0x15, /* vertical blank start */ Cvbe= 0x16, /* vertical blank end */ Cmode= 0x17, /* mode register */
1991/0727		ARX= 0x3C0, /* index to attribute registers */ AR= 0x3C1, /* attribute registers */ Amode= 0x10, /* mode register */
1991/1107/sys/src/9/pc/vga.c:89,106 – 1991/1109/sys/src/9/pc/vga.c:98,104
1991/0727		outb(CRX, reg); outb(CR, val); }
1991/1107		crdump(void) { uchar x; int i; for(i = 0; i < 0x16; i++){ outb(CRX, i); x = inb(CR); print("cr[0x%lux] = %ux\n", i, x); } }
1991/0724
1991/0723		/*
1991/0727		* m is a bit mask of planes to be affected by CPU writes
1991/0723		*/
1991/1107/sys/src/9/pc/vga.c:118,164 – 1991/1109/sys/src/9/pc/vga.c:116,133
1991/0727		} /*
1991/0928		* 2 bit deep display. the bits are adjacent. maybe this * will work * 4 color
1991/1109		* set up like vga mode 0x12 * 16 color (though we only use values 0x0 and 0xf)
1991/0928		* 640x480
1991/1109		* * we assume the BIOS left the registers in a * CGA-like mode. Thus we don't set all the registers.
1991/0928		*/ vga2(void)
1991/1109		vga12(void)
1991/0928		{ int i; arout(Acpe, 0x00); /* disable planes for output */
1991/1109		int overflow; int msl;
1991/0928		gscreen.ldepth = 1; arout(Amode, 0x01); /* color graphics mode */ grout(Gmisc, 0x01); /* graphics mode */ grout(Gmode, 0x30); /* 2 bits deep, even bytes are * planes 0 and 2, odd are planes * 1 and 3 */ grout(Grot, 0x00); /* CPU writes bytes to video * mem without modifications */ crout(Cmode, 0xe3); /* turn off address wrap & * word mode */ crout(Cmsl, 0x40); /* 1 pixel per scan line */ crout(Cvertend, MAXY); /* 480 lne display */ srout(Smode, 0x06); /* extended memory, odd/even */ srout(Sclock, 0x01); /* 8 bits/char */ srout(Smmask, 0x0f); /* enable 2 planes for writing */                  arout(Acpe, 0x0f); /* enable 2 planes for output */ for(i = 0; i < 128*1024;){ ((uchar*)SCREENMEM)[i++] = 0x1b; ((uchar*)SCREENMEM)[i++] = 0xe4; } for(;;); }                  /* * set up like vga mode 0x11 * 2 color * 640x480 */ vga1(void) { arout(Acpe, 0x00); /* disable planes for output */ gscreen.ldepth = 0;
1991/1107/sys/src/9/pc/vga.c:167,176 – 1991/1109/sys/src/9/pc/vga.c:136,168
1991/0928		grout(Gmode, 0x00); /* 1 bit deep */ grout(Grot, 0x00); /* CPU writes bytes to video * mem without modifications */
1991/1109		msl = overflow = 0;
1991/0928		crout(Cmode, 0xe3); /* turn off address wrap & * word mode */ crout(Cmsl, 0x40); /* 1 pixel per scan line */
1991/1002		crout(Cvertend, MAXY-1); /* 480 lne display */
1991/1109		/* last scan line displayed (first is 0) */ crout(Cvde, MAXY-1); overflow |= ((MAXY-1)&0x200) ? 0x40 : 0; overflow |= ((MAXY-1)&0x100) ? 0x2 : 0; /* total scan lines (including retrace) - 2 */ crout(Cvt, (YPERIOD-2)); overflow |= ((YPERIOD-2)&0x200) ? 0x20 : 0; overflow |= ((YPERIOD-2)&0x100) ? 0x1 : 0; /* scan lines at which vertcal retrace starts & ends */ crout(Cvrs, (MAXY+10)); overflow |= ((MAXY+10)&0x200) ? 0x80 : 0; overflow |= ((MAXY+10)&0x100) ? 0x4 : 0; crout(Cvre, ((YPERIOD-1)&0xf)|0xa0); /* also disable vertical interrupts */ /* scan lines at which vertical blanking starts & ends */ crout(Cvbs, (MAXY+YBORDER)); msl |= ((MAXY+YBORDER)&0x200) ? 0x20 : 0; overflow |= ((MAXY+YBORDER)&0x100) ? 0x8 : 0; crout(Cvbe, (YPERIOD-YBORDER)&0x7f); /* pixels per scan line (always 0 for graphics) */ crout(Cmsl, 0x40|msl); /* also 10th bit of line compare */ /* the overflow bits from the other registers */ crout(Cvover, 0x10|overflow); /* also 9th bit of line compare */
1991/0928		srout(Smode, 0x06); /* extended memory, * odd/even off */ srout(Sclock, 0x01); /* 8 bits/char */
1991/1107/sys/src/9/pc/vga.c:186,192 – 1991/1109/sys/src/9/pc/vga.c:178,184
1991/0727		int c;
1991/0730		ulong *l;
1991/0723
1991/0928		vga1();
1991/1109		vga12();
1991/0929
1991/0727		/*
1991/0801		* swizzle the font longs.