cgsix.c

早期freebsd实现

			if (error)
				return (error);
		} else {
			p->cmap.index = 0;
			p->cmap.count = 2;
		}
		/* end ugh */
		break;

	case FBIOSCURSOR:
		/*
		 * For setcmap and setshape, verify parameters, so that
		 * we do not get halfway through an update and then crap
		 * out with the software state screwed up.
		 */
		v = p->set;
		if (v & FB_CUR_SETCMAP) {
			/*
			 * This use of a temporary copy of the cursor
			 * colormap is not terribly efficient, but these
			 * copies are small (8 bytes)...
			 */
			tcm = cc->cc_color;
			error = bt_putcmap(&p->cmap, (union bt_cmap *)&tcm, 2);
			if (error)
				return (error);
		}
		if (v & FB_CUR_SETSHAPE) {
			if ((u_int)p->size.x > 32 || (u_int)p->size.y > 32)
				return (EINVAL);
			count = p->size.y * 32 / NBBY;
			if (!useracc(p->image, count, B_READ) ||
			    !useracc(p->mask, count, B_READ))
				return (EFAULT);
		}

		/* parameters are OK; do it */
		if (v & (FB_CUR_SETCUR | FB_CUR_SETPOS | FB_CUR_SETHOT)) {
			if (v & FB_CUR_SETCUR)
				cc->cc_enable = p->enable;
			if (v & FB_CUR_SETPOS)
				cc->cc_pos = p->pos;
			if (v & FB_CUR_SETHOT)
				cc->cc_hot = p->hot;
			cg6_setcursor(sc);
		}
		if (v & FB_CUR_SETCMAP) {
			cc->cc_color = tcm;
			cg6_loadomap(sc); /* XXX defer to vertical retrace */
		}
		if (v & FB_CUR_SETSHAPE) {
			cc->cc_size = p->size;
			count = p->size.y * 32 / NBBY;
			bzero((caddr_t)cc->cc_bits, sizeof cc->cc_bits);
			bcopy(p->mask, (caddr_t)cc->cc_bits[0], count);
			bcopy(p->image, (caddr_t)cc->cc_bits[1], count);
			cg6_loadcursor(sc);
		}
		break;

#undef p
#undef cc

	case FBIOGCURPOS:
		*(struct fbcurpos *)data = sc->sc_cursor.cc_pos;
		break;

	case FBIOSCURPOS:
		sc->sc_cursor.cc_pos = *(struct fbcurpos *)data;
		cg6_setcursor(sc);
		break;

	case FBIOGCURMAX:
		/* max cursor size is 32x32 */
		((struct fbcurpos *)data)->x = 32;
		((struct fbcurpos *)data)->y = 32;
		break;

	default:
#ifdef DEBUG
		log(LOG_NOTICE, "cgsixioctl(%x) (%s[%d])\n", cmd,
		    p->p_comm, p->p_pid);
#endif
		return (ENOTTY);
	}
	return (0);
}

/*
 * Clean up hardware state (e.g., after bootup or after X crashes).
 */
static void
cg6_reset(sc)
	register struct cgsix_softc *sc;
{
	register volatile struct cg6_tec_xxx *tec;
	register int fhc;
	register volatile struct bt_regs *bt;

	/* hide the cursor, just in case */
	sc->sc_thc->thc_cursxy = (THC_CURSOFF << 16) | THC_CURSOFF;

	/* turn off frobs in transform engine (makes X11 work) */
	tec = sc->sc_tec;
	tec->tec_mv = 0;
	tec->tec_clip = 0;
	tec->tec_vdc = 0;

	/* take care of hardware bugs in old revisions */
	if (sc->sc_fhcrev < 5) {
		/*
		 * Keep current resolution; set cpu to 68020, set test
		 * window (size 1Kx1K), and for rev 1, disable dest cache.
		 */
		fhc = (*sc->sc_fhc & FHC_RES_MASK) | FHC_CPU_68020 |
		    FHC_TEST |
		    (11 << FHC_TESTX_SHIFT) | (11 << FHC_TESTY_SHIFT);
		if (sc->sc_fhcrev < 2)
			fhc |= FHC_DST_DISABLE;
		*sc->sc_fhc = fhc;
	}

	/* Enable cursor in Brooktree DAC. */
	bt = sc->sc_bt;
	bt->bt_addr = 0x06 << 24;
	bt->bt_ctrl |= 0x03 << 24;
}

static void
cg6_setcursor(sc)
	register struct cgsix_softc *sc;
{

	/* we need to subtract the hot-spot value here */
#define COORD(f) (sc->sc_cursor.cc_pos.f - sc->sc_cursor.cc_hot.f)
	sc->sc_thc->thc_cursxy = sc->sc_cursor.cc_enable ?
	    ((COORD(x) << 16) | (COORD(y) & 0xffff)) :
	    (THC_CURSOFF << 16) | THC_CURSOFF;
#undef COORD
}

static void
cg6_loadcursor(sc)
	register struct cgsix_softc *sc;
{
	register volatile struct cg6_thc *thc;
	register u_int edgemask, m;
	register int i;

	/*
	 * Keep the top size.x bits.  Here we *throw out* the top
	 * size.x bits from an all-one-bits word, introducing zeros in
	 * the top size.x bits, then invert all the bits to get what
	 * we really wanted as our mask.  But this fails if size.x is
	 * 32---a sparc uses only the low 5 bits of the shift count---
	 * so we have to special case that.
	 */
	edgemask = ~0;
	if (sc->sc_cursor.cc_size.x < 32)
		edgemask = ~(edgemask >> sc->sc_cursor.cc_size.x);
	thc = sc->sc_thc;
	for (i = 0; i < 32; i++) {
		m = sc->sc_cursor.cc_bits[0][i] & edgemask;
		thc->thc_cursmask[i] = m;
		thc->thc_cursbits[i] = m & sc->sc_cursor.cc_bits[1][i];
	}
}

/*
 * Load a subset of the current (new) colormap into the color DAC.
 */
static void
cg6_loadcmap(sc, start, ncolors)
	register struct cgsix_softc *sc;
	register int start, ncolors;
{
	register volatile struct bt_regs *bt;
	register u_int *ip, i;
	register int count;

	ip = &sc->sc_cmap.cm_chip[BT_D4M3(start)];	/* start/4 * 3 */
	count = BT_D4M3(start + ncolors - 1) - BT_D4M3(start) + 3;
	bt = sc->sc_bt;
	bt->bt_addr = BT_D4M4(start) << 24;
	while (--count >= 0) {
		i = *ip++;
		/* hardware that makes one want to pound boards with hammers */
		bt->bt_cmap = i;
		bt->bt_cmap = i << 8;
		bt->bt_cmap = i << 16;
		bt->bt_cmap = i << 24;
	}
}

/*
 * Load the cursor (overlay `foreground' and `background') colors.
 */
static void
cg6_loadomap(sc)
	register struct cgsix_softc *sc;
{
	register volatile struct bt_regs *bt;
	register u_int i;

	bt = sc->sc_bt;
	bt->bt_addr = 0x01 << 24;	/* set background color */
	i = sc->sc_cursor.cc_color.cm_chip[0];
	bt->bt_omap = i;		/* R */
	bt->bt_omap = i << 8;		/* G */
	bt->bt_omap = i << 16;		/* B */

	bt->bt_addr = 0x03 << 24;	/* set foreground color */
	bt->bt_omap = i << 24;		/* R */
	i = sc->sc_cursor.cc_color.cm_chip[1];
	bt->bt_omap = i;		/* G */
	bt->bt_omap = i << 8;		/* B */
}

static void
cg6_unblank(dev)
	struct device *dev;
{
	struct cgsix_softc *sc = (struct cgsix_softc *)dev;

	if (sc->sc_blanked) {
		sc->sc_blanked = 0;
		sc->sc_thc->thc_misc |= THC_MISC_VIDEN;
	}
}

/* XXX the following should be moved to a "user interface" header */
/*
 * Base addresses at which users can mmap() the various pieces of a cg6.
 * Note that although the Brooktree color registers do not occupy 8K,
 * the X server dies if we do not allow it to map 8K there (it just maps
 * from 0x70000000 forwards, as a contiguous chunk).
 */
#define	CG6_USER_FBC	0x70000000
#define	CG6_USER_TEC	0x70001000
#define	CG6_USER_BTREGS	0x70002000
#define	CG6_USER_FHC	0x70004000
#define	CG6_USER_THC	0x70005000
#define	CG6_USER_ROM	0x70006000
#define	CG6_USER_RAM	0x70016000
#define	CG6_USER_DHC	0x80000000

struct mmo {
	u_int	mo_uaddr;	/* user (virtual) address */
	u_int	mo_size;	/* size, or 0 for video ram size */
	u_int	mo_physoff;	/* offset from sc_physadr */
};

/*
 * Return the address that would map the given device at the given
 * offset, allowing for the given protection, or return -1 for error.
 *
 * XXX	needs testing against `demanding' applications (e.g., aviator)
 */
int
cgsixmap(dev, off, prot)
	dev_t dev;
	int off, prot;
{
	register struct cgsix_softc *sc = cgsixcd.cd_devs[minor(dev)];
	register struct mmo *mo;
	register u_int u, sz;
#define	O(memb) ((u_int)(&((struct cg6_layout *)0)->memb))
	static struct mmo mmo[] = {
		{ CG6_USER_RAM, 0, O(cg6_ram) },

		/* do not actually know how big most of these are! */
		{ CG6_USER_FBC, 1, O(cg6_fbc_un) },
		{ CG6_USER_TEC, 1, O(cg6_tec_un) },
		{ CG6_USER_BTREGS, 8192 /* XXX */, O(cg6_bt_un) },
		{ CG6_USER_FHC, 1, O(cg6_fhc_un) },
		{ CG6_USER_THC, sizeof(struct cg6_thc), O(cg6_thc_un) },
		{ CG6_USER_ROM, 65536, O(cg6_rom_un) },
		{ CG6_USER_DHC, 1, O(cg6_dhc_un) },
	};
#define NMMO (sizeof mmo / sizeof *mmo)

	if (off & PGOFSET)
		panic("cgsixmap");

	/*
	 * Entries with size 0 map video RAM (i.e., the size in fb data).
	 *
	 * Since we work in pages, the fact that the map offset table's
	 * sizes are sometimes bizarre (e.g., 1) is effectively ignored:
	 * one byte is as good as one page.
	 */
	for (mo = mmo; mo < &mmo[NMMO]; mo++) {
		if ((u_int)off < mo->mo_uaddr)
			continue;
		u = off - mo->mo_uaddr;
		sz = mo->mo_size ? mo->mo_size : sc->sc_fb.fb_type.fb_size;
		if (u < sz)
			return ((int)sc->sc_physadr + u + mo->mo_physoff +
			    PMAP_OBIO + PMAP_NC);
	}
#ifdef DEBUG
	{
	  register struct proc *p = curproc;	/* XXX */
	  log(LOG_NOTICE, "cgsixmap(%x) (%s[%d])\n", off, p->p_comm, p->p_pid);
	}
#endif
	return (-1);	/* not a user-map offset */
}