1 /* $NetBSD: cg2reg.h,v 1.7 2023/03/28 20:01:57 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Dennis Ferguson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* cg2reg.h - CG2 colour frame buffer definitions 29 * 30 * The mapped memory looks like: 31 * 32 * offset contents 33 * 0x000000 bit plane map - 1st (of 8) plane used by the X server in -mono mode 34 * 0x100000 pixel map - used by the X server in color mode 35 * 0x200000 raster op mode memory map - unused by X server 36 * 0x300000 random control registers (lots of spaces in between) 37 * 0x310000 shadow colour map 38 */ 39 40 /* Frame buffer memory size and depth */ 41 #define CG2_FBSIZE (1024 * 1024) 42 #define CG2_N_PLANE 8 43 44 /* Screen dimensions */ 45 #define CG2_WIDTH 1152 46 #define CG2_HEIGHT 900 47 48 /* arrangement of bit plane mode memory */ 49 union bitplane { 50 u_short word[CG2_HEIGHT][CG2_WIDTH/(CG2_N_PLANE * sizeof(u_short))]; 51 u_short plane[CG2_FBSIZE/(CG2_N_PLANE * sizeof(u_short))]; 52 }; 53 54 /* arrangement of pixel mode memory */ 55 union byteplane { 56 u_char pixel[CG2_HEIGHT][CG2_WIDTH]; 57 u_char frame[CG2_FBSIZE]; 58 }; 59 60 61 /* 62 * Structure describing the first two megabytes of the frame buffer. 63 * Normal memory maps in bit plane and pixel modes 64 */ 65 struct cg2memfb { 66 union bitplane memplane[CG2_N_PLANE]; /* bit plane map */ 67 union byteplane pixplane; /* pixel map */ 68 }; 69 70 71 /* 72 * Control/status register. The X server only appears to use update_cmap 73 * and video_enab. 74 */ 75 struct cg2statusreg { 76 u_int reserved : 2; /* not used */ 77 u_int fastread : 1; /* r/o: has some feature I don't understand */ 78 u_int id : 1; /* r/o: ext status and ID registers exist */ 79 u_int resolution : 4; /* screen resolution, 0 means 1152x900 */ 80 u_int retrace : 1; /* r/o: retrace in progress */ 81 u_int inpend : 1; /* r/o: interrupt request */ 82 u_int ropmode : 3; /* ?? */ 83 u_int inten : 1; /* interrupt enable (for end of retrace) */ 84 u_int update_cmap : 1; /* copy/use shadow colour map */ 85 u_int video_enab : 1; /* enable video */ 86 }; 87 88 89 /* 90 * Extended status register. Unused by X server 91 */ 92 struct cg2_extstatus { 93 u_int gpintreq : 1; /* interrupt request */ 94 u_int gpintdis : 1; /* interrupt disable */ 95 u_int reserved : 13; /* unused */ 96 u_int gpbus : 1; /* bus enabled */ 97 }; 98 99 100 /* 101 * Double buffer control register. It appears that (some of?) the 102 * cg2 cards support a pair of memory sets, referred to as `A' and 103 * `B', which can be swapped to allow atomic screen updates. This 104 * controls them. 105 */ 106 struct dblbufreg { 107 u_int display_b : 1; /* display memory B (set) or A (reset) */ 108 u_int read_b : 1; /* access memory B (set) or A (reset) */ 109 u_int nowrite_b : 1; /* when set, writes don't update memory B */ 110 u_int nowrite_a : 1; /* when set, writes don't update memory A */ 111 u_int read_ecmap : 1; /* copy from(clear)/to(set) shadow colour map */ 112 u_int fast_read : 1; /* fast reads, but wrong data */ 113 u_int wait : 1; /* when set, remains so to end up v. retrace */ 114 u_int update_ecmap : 1; /* copy/use shadow colour map */ 115 u_int reserved : 8; 116 }; 117 118 119 /* 120 * Zoom register, apparently present on Sun-2 colour boards only. See 121 * the Sun documentation, I don't know anyone who still has a Sun-2. 122 */ 123 struct cg2_zoom { 124 union { 125 u_short reg; 126 u_char reg_pad[4096]; 127 } wordpan; 128 union { 129 struct { 130 u_int unused : 8; 131 u_int lineoff : 4; 132 u_int pixzoom : 4; 133 } reg; 134 u_short word; 135 u_char reg_pad[4096]; 136 } zoom; 137 union { 138 struct { 139 u_int unused : 8; 140 u_int lorigin : 4; 141 u_int pixeloff : 4; 142 } reg; 143 u_short word; 144 u_char reg_pad[4096]; 145 } pixpan; 146 union { 147 u_short reg; 148 u_char reg_pad[4096]; 149 } varzoom; 150 }; 151 152 153 /* 154 * Miscellany. On the Sun-3 these registers exist in place of the above. 155 */ 156 struct cg2_nozoom { 157 union { /* double buffer register (see above) */ 158 struct dblbufreg reg; 159 u_short word; 160 u_char reg_pad[4096]; 161 } dblbuf; 162 union { /* start of DMA window */ 163 u_short reg; 164 u_char reg_pad[4096]; 165 } dmabase; 166 union { /* DMA window size */ 167 u_short reg; /* actually 8 bits. reg*16 == size */ 168 u_char reg_pad[4096]; 169 } dmawidth; 170 union { /* frame count */ 171 u_short reg; /* actually 8 bits only. r/o */ 172 u_char reg_pad[4096]; 173 } framecnt; 174 }; 175 176 177 /* 178 * Raster op control registers. X doesn't use this, but documented here 179 * for future reference. 180 */ 181 struct memropc { 182 u_short mrc_dest; 183 u_short mrc_source1; 184 u_short mrc_source2; 185 u_short mrc_pattern; 186 u_short mrc_mask1; 187 u_short mrc_mask2; 188 u_short mrc_shift; 189 u_short mrc_op; 190 u_short mrc_width; 191 u_short mrc_opcount; 192 u_short mrc_decoderout; 193 u_short mrc_x11; 194 u_short mrc_x12; 195 u_short mrc_x13; 196 u_short mrc_x14; 197 u_short mrc_x15; 198 }; 199 200 201 /* 202 * Last chunk of the frame buffer (i.e. from offset 0x200000 and above). 203 * Exists separately from struct cg2memfb apparently because Sun software 204 * avoids mapping the latter, though X uses it. 205 */ 206 struct cg2fb { 207 208 #ifndef _KERNEL /* XXX - Hack! */ 209 /* XXX - Don't want this permanently in the kernel mapping. */ 210 union { /* raster op mode frame memory */ 211 union bitplane ropplane[CG2_N_PLANE]; 212 union byteplane roppixel; 213 } ropio; 214 #endif /* _KERNEL XXX - Hack! */ 215 216 union { /* raster op control unit (1 per plane) */ 217 struct memropc ropregs; 218 struct { 219 u_char pad[2048]; 220 struct memropc ropregs; 221 } prime; 222 u_char reg_pad[4096]; 223 } ropcontrol[9]; 224 union { /* status register */ 225 struct cg2statusreg reg; 226 u_short word; 227 u_char reg_pad[4096]; 228 } status; 229 union { /* per-plane mask register */ 230 u_short reg; /* 8 bit mask register - set means plane r/w */ 231 u_char reg_pad[4096]; 232 } ppmask; 233 union { /* miscellaneous registers */ 234 struct cg2_zoom zoom; 235 struct cg2_nozoom nozoom; 236 } misc; 237 union { /* interrupt vector */ 238 u_short reg; 239 u_char reg_pad[32]; 240 } intrptvec; 241 union { /* board ID */ 242 u_short reg; 243 u_char reg_pad[16]; 244 } id; 245 union { /* extended status */ 246 struct cg2_extstatus reg; 247 u_short word; 248 u_char reg_pad[16]; 249 } extstatus; 250 union { /* auxiliary raster op mode register (?)*/ 251 u_short reg; 252 u_char reg_pad[4032]; 253 } ropmode; 254 u_short redmap[256]; /* shadow colour maps */ 255 u_short greenmap[256]; 256 u_short bluemap[256]; 257 }; 258
Indexes created Sat Sep 20 22:09:52 GMT 2025