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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: bt478.c
* Author: Alessandro Forin, Carnegie Mellon University
* Date: 9/90
*
* Routines for the bt478 Cursor/RAMDAC chip
*/
#include <platforms.h>
#include <chips/bt478.h>
#include <chips/screen.h>
#ifdef DECSTATION
typedef struct {
volatile unsigned char addr_mapwa;
char pad0[3];
volatile unsigned char addr_map;
char pad1[3];
volatile unsigned char addr_mask;
char pad2[3];
volatile unsigned char addr_mapra;
char pad3[3];
volatile unsigned char addr_overwa;
char pad4[3];
volatile unsigned char addr_over;
char pad5[3];
volatile unsigned char addr_xxxx;
char pad6[3];
volatile unsigned char addr_overra;
char pad7[3];
} bt478_padded_regmap_t;
#else /*DECSTATION*/
typedef bt478_regmap_t bt478_padded_regmap_t;
#define wbflush()
#endif /*DECSTATION*/
/*
* Cursor color
*/
static
bt478_load_cc(bt478, bg, fg)
register bt478_padded_regmap_t *bt478;
unsigned int *bg, *fg;
{
register int i;
/* See init function for gotchas */
bt478->addr_overwa = 4;
wbflush();
for (i = 0; i < 3; i++) {
bt478->addr_over = (*bg++) >> 8;
wbflush();
}
bt478->addr_overwa = 8;
wbflush();
bt478->addr_over = 0x00;
wbflush();
bt478->addr_over = 0x00;
wbflush();
bt478->addr_over = 0x7f;
wbflush();
bt478->addr_overwa = 12;
wbflush();
for (i = 0; i < 3; i++) {
bt478->addr_over = (*fg++) >> 8;
wbflush();
}
}
bt478_cursor_color(bt478, color)
bt478_padded_regmap_t *bt478;
cursor_color_t *color;
{
register int i;
register unsigned int *p;
/* Do it twice, in case of collisions */
bt478_load_cc(bt478, color->Bg_rgb, color->Fg_rgb);
p = color->Bg_rgb;
for (i = 0; i < 3; i++) {
bt478->addr_over = (*p++) >> 8;
wbflush();
}
p = color->Fg_rgb;
for (i = 0; i < 3; i++) {
bt478->addr_over = (*p++) >> 8;
wbflush();
}
bt478_load_cc(bt478, color->Bg_rgb, color->Fg_rgb);
}
/*
* Color map
*/
bt478_load_colormap( regs, map)
bt478_padded_regmap_t *regs;
color_map_t *map;
{
register int i;
regs->addr_mapwa = 0;
wbflush();
for (i = 0; i < 256; i++, map++) {
regs->addr_map = map->red;
wbflush();
regs->addr_map = map->green;
wbflush();
regs->addr_map = map->blue;
wbflush();
}
}
bt478_load_colormap_entry( regs, entry, map)
bt478_padded_regmap_t *regs;
color_map_t *map;
{
regs->addr_mapwa = entry & 0xff;
wbflush();
regs->addr_map = map->red;
wbflush();
regs->addr_map = map->green;
wbflush();
regs->addr_map = map->blue;
wbflush();
}
/*
* Video on/off (unused)
*/
bt478_video_on(pregs, up)
bt478_padded_regmap_t **pregs;
{
(*pregs)->addr_mask = 0xff;
}
bt478_video_off(pregs, up)
bt478_padded_regmap_t **pregs;
{
(*pregs)->addr_mask = 0;
}
/*
* Initialization
*/
static
bt478_overlay(regs, plane)
bt478_padded_regmap_t *regs;
unsigned char *plane;
{
*plane = 0xff;
/* Overlay planes 0 and 1 are wired zero, overlay plane 2
is plane "B" of the cursor (second half of it), plane 3
is plane "A" of the cursor. Soo, we get three colors
for the cursor, at map entries 4, 8 and 12 */
# define ovv(i,r,g,b) \
regs->addr_overwa = i; wbflush(); \
regs->addr_over = r; wbflush(); \
regs->addr_over = b; wbflush(); \
regs->addr_over = g; wbflush();
ovv(4,0,0,0); ovv(8,0,0,0x7f); ovv(12,0xff,0xff,0xff);
# undef ovv
/* enable data input */
regs->addr_mask = 0xff;
}
bt478_init_bw_map(regs, plane)
bt478_padded_regmap_t *regs;
{
register int i;
/* Set overlay color registers */
bt478_overlay(regs, plane);
/* loadup vdac map */
# define mvv(i,v) { \
regs->addr_mapwa = i; wbflush(); \
regs->addr_map = v; wbflush(); \
regs->addr_map = v; wbflush(); \
regs->addr_map = v; wbflush();}
for (i = 0; i < 128; i++) mvv(i,0x00);
for (i = i; i < 256; i++) mvv(i,0xff);
}
bt478_init_color_map( regs, plane)
bt478_padded_regmap_t *regs;
{
register int i;
bt478_overlay(regs, plane);
mvv(0,0);
mvv(1,0xff);
mvv(255,0xff);
# undef mvv
}
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