NetBSD-5.0.2/sys/dev/sun/bt_subr.c
/* $NetBSD: bt_subr.c,v 1.9 2005/12/11 12:23:56 christos Exp $ */
/*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)bt_subr.c 8.2 (Berkeley) 1/21/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bt_subr.c,v 1.9 2005/12/11 12:23:56 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <uvm/uvm_extern.h>
#include <dev/sun/fbio.h>
#include <dev/sun/btreg.h>
#include <dev/sun/btvar.h>
/*
* Common code for dealing with Brooktree video DACs.
* (Contains some software-only code as well, since the colormap
* ioctls are shared between the cgthree and cgsix drivers.)
*/
/*
* Implement an FBIOGETCMAP-like ioctl.
*/
int
bt_getcmap(p, cm, cmsize, uspace)
struct fbcmap *p;
union bt_cmap *cm;
int cmsize;
int uspace;
{
u_int i, start, count;
int error = 0;
u_char *cp, *r, *g, *b;
u_char *cbuf = NULL;
start = p->index;
count = p->count;
if (start >= cmsize || count > cmsize - start)
return (EINVAL);
if (uspace) {
/* Allocate temporary buffer for color values */
cbuf = malloc(3 * count * sizeof(char), M_TEMP, M_WAITOK);
r = cbuf;
g = r + count;
b = g + count;
} else {
/* Direct access in kernel space */
r = p->red;
g = p->green;
b = p->blue;
}
/* Copy colors from BT map to fbcmap */
for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
r[i] = cp[0];
g[i] = cp[1];
b[i] = cp[2];
}
if (uspace) {
error = copyout(r, p->red, count);
if (error)
goto out;
error = copyout(g, p->green, count);
if (error)
goto out;
error = copyout(b, p->blue, count);
if (error)
goto out;
}
out:
if (cbuf != NULL)
free(cbuf, M_TEMP);
return (error);
}
/*
* Implement the software portion of an FBIOPUTCMAP-like ioctl.
*/
int
bt_putcmap(p, cm, cmsize, uspace)
struct fbcmap *p;
union bt_cmap *cm;
int cmsize;
int uspace;
{
u_int i, start, count;
int error = 0;
u_char *cp, *r, *g, *b;
u_char *cbuf = NULL;
start = p->index;
count = p->count;
if (start >= cmsize || count > cmsize - start)
return (EINVAL);
if (uspace) {
/* Allocate temporary buffer for color values */
cbuf = malloc(3 * count * sizeof(char), M_TEMP, M_WAITOK);
r = cbuf;
g = r + count;
b = g + count;
error = copyin(p->red, r, count);
if (error)
goto out;
error = copyin(p->green, g, count);
if (error)
goto out;
error = copyin(p->blue, b, count);
if (error)
goto out;
} else {
/* Direct access in kernel space */
r = p->red;
g = p->green;
b = p->blue;
}
/* Copy colors from fbcmap to BT map */
for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
cp[0] = r[i];
cp[1] = g[i];
cp[2] = b[i];
}
out:
if (cbuf != NULL)
free(cbuf, M_TEMP);
return (error);
}
/*
* Initialize the color map to the default state:
*
* - 0 is white (PROM uses entry 0 for background)
* - all other entries are black (PROM uses entry 255 for foreground)
*/
void
bt_initcmap(cm, cmsize)
union bt_cmap *cm;
int cmsize;
{
int i;
u_char *cp;
cp = &cm->cm_map[0][0];
cp[0] = cp[1] = cp[2] = 0xff;
for (i = 1, cp = &cm->cm_map[i][0]; i < cmsize; cp += 3, i++)
cp[0] = cp[1] = cp[2] = 0;
#ifdef RASTERCONSOLE
if (cmsize > 16) {
/*
* Setup an ANSI map at offset 1, for rasops;
* see dev/fb.c for usage (XXX - this should
* be replaced by more general colormap handling)
*/
extern u_char rasops_cmap[];
bcopy(rasops_cmap, &cm->cm_map[1][0], 3*16);
}
#endif
}
#if notyet
static void
bt_loadcmap_packed256(fb, bt, start, ncolors)
struct fbdevice *fb;
volatile struct bt_regs *bt;
int start, ncolors;
{
u_int v;
int count, i;
u_char *c[3], **p;
struct cmap *cm = &fb->fb_cmap;
count = BT_D4M3(start + ncolors - 1) - BT_D4M3(start) + 3;
bt = &sc->sc_fbc->fbc_dac;
bt->bt_addr = BT_D4M4(start);
/*
* Figure out where to start in the RGB arrays
* See btreg.h for the way RGB triplets are packed into 4-byte words.
*/
c[0] = &cm->red[(4 * count) / 3)];
c[1] = &cm->green[(4 * count) / 3];
c[2] = &cm->blue[(4 * count) / 3];
p = &c[0];
i = (4 * count) % 3; /* This much of the last triplet is already in
the last packed word */
while (i--) {
c[1-i]++;
p++;
}
while (--count >= 0) {
u_int v = 0;
/*
* Retrieve four colormap entries, pack them into
* a 32-bit word and write to the hardware register.
*/
for (i = 0; i < 4; i++) {
u_char *cp = *p;
v |= *cp++ << (8 * i);
*p = cp;
if (p++ == &c[2])
/* Wrap around */
p = &c[0];
}
bt->bt_cmap = v;
}
}
#endif