disable the cursor ont he pipe

disable the cursor ont he pipe

[kokamoto]

Following the manuaql, they say we must disable the cursor
before loading cursor date, and then enable it.

I tested two cases:
Both tests failed, and resulted into the same results before.

1)
igfxcurload(VGAscr* scr, Cursor* curs)
{
	uchar set, clr;
	u32int *p, *r;
	int i, j;

	if(scr->storage == 0)
		return;
print("calling curload\n");
	for(i=0; i<3; i++)	{	/* disable the Pipe cursor */
		if((scr->mmio[(0x70008 | (i*0x1000))/4] & (1<<31)) != 0) {
			scr->mmio[(0x70008 | (i*0x1000))/4]  |= 1<<18;
			print("Cursor i=%d disabled\n", i);
		}
	}
	p = (u32int*)((uchar*)scr->vaddr + scr->storage);
	memset(p, 0, 64*64*4);

	for(i=0;i<32;i++) {
		set = curs->set[i];
		clr = curs->clr[i];
		for(j=0x80; j; j>>=1){
			if((set|clr)&j)
				*p++ = (0xFF<<24) | (set&j ? 0x000000 : 0xFFFFFF);
			else
				*p++ = 0;
		}
		if(i & 1)
			p += 64-16;
	}
	for(i=0; i<3; i++)	{	/* enable the Pipe cursor */
		if((scr->mmio[(0x70008 | (i*0x1000))/4] & (1<<31)) != 0) {
			scr->mmio[(0x70008 | (i*0x1000))/4] &= 0xFFFBFFFF;
			print("Cursor i=%d enabled\n", i);
		}
	}
	scr->offset = curs->offset;
}

2)
igfxcurload(VGAscr* scr, Cursor* curs)
{
	uchar set, clr;
	u32int *p, *r;
	int i, j;

	if(scr->storage == 0)
		return;
print("calling curload\n");
	for(i=0; i<NPIPE; i++){
		if((r = igfxcurregs(scr, i)) != nil) {
			r[CURCTL] &= ~(1<<5 | 7);		/* disable the cursor */
		}
	}	p = (u32int*)((uchar*)scr->vaddr + scr->storage);
	memset(p, 0, 64*64*4);

	for(i=0;i<32;i++) {
		set = curs->set[i];
		clr = curs->clr[i];
		for(j=0x80; j; j>>=1){
			if((set|clr)&j)
				*p++ = (0xFF<<24) | (set&j ? 0x000000 : 0xFFFFFF);
			else
				*p++ = 0;
		}
		if(i & 1)
			p += 64-16;
	}
	for(i=0; i<NPIPE; i++){
		if((r = igfxcurregs(scr, i)) != nil){
			r[CURCTL] = (r[CURCTL] & ~(3<<28 | 1<<5)) | (i<<28) | 7;	/* enable the cursor */
			r[CURBASE] = scr->storage;
	}
	scr->offset = curs->offset;
}