1 | /*␊ |
2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * @APPLE_LICENSE_HEADER_START@␊ |
5 | * ␊ |
6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
8 | * Original Code as defined in and that are subject to the Apple Public␊ |
9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
10 | * except in compliance with the License. Please obtain a copy of the␊ |
11 | * License at http://www.apple.com/publicsource and read it before using␊ |
12 | * this file.␊ |
13 | * ␊ |
14 | * The Original Code and all software distributed under the License are␊ |
15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
19 | * License for the specific language governing rights and limitations␊ |
20 | * under the License.␊ |
21 | * ␊ |
22 | * @APPLE_LICENSE_HEADER_END@␊ |
23 | */␊ |
24 | /*␊ |
25 | * Copyright 1993 NeXT, Inc.␊ |
26 | * All rights reserved.␊ |
27 | */␊ |
28 | ␊ |
29 | #include "libsaio.h"␊ |
30 | #include "vbe.h"␊ |
31 | #include "edid.h" //Azi:autoresolution␊ |
32 | ␊ |
33 | /* ␊ |
34 | * Various inline routines for video I/O␊ |
35 | */␊ |
36 | static inline void␊ |
37 | outi (int port, int index, int val)␊ |
38 | {␊ |
39 | outw (port, (val << 8) | index);␊ |
40 | }␊ |
41 | ␊ |
42 | static inline void␊ |
43 | outib (int port, int index, int val)␊ |
44 | {␊ |
45 | outb (port, index);␊ |
46 | outb (port + 1, val);␊ |
47 | }␊ |
48 | ␊ |
49 | static inline int␊ |
50 | ini (int port, int index)␊ |
51 | {␊ |
52 | outb (port, index);␊ |
53 | return inb (port + 1);␊ |
54 | }␊ |
55 | ␊ |
56 | static inline void␊ |
57 | rmwi (int port, int index, int clear, int set)␊ |
58 | {␊ |
59 | outb (port, index);␊ |
60 | outb (port + 1, (inb (port + 1) & ~clear) | set);␊ |
61 | }␊ |
62 | ␊ |
63 | /*␊ |
64 | * Globals␊ |
65 | */␊ |
66 | static biosBuf_t bb;␊ |
67 | ␊ |
68 | int getVBEInfo( void * infoBlock )␊ |
69 | {␊ |
70 | bb.intno = 0x10;␊ |
71 | bb.eax.rr = funcGetControllerInfo;␊ |
72 | bb.es = SEG( infoBlock );␊ |
73 | bb.edi.rr = OFF( infoBlock );␊ |
74 | bios( &bb );␊ |
75 | return(bb.eax.r.h);␊ |
76 | }␊ |
77 | ␊ |
78 | int getVBEModeInfo( int mode, void * minfo_p )␊ |
79 | {␊ |
80 | bb.intno = 0x10;␊ |
81 | bb.eax.rr = funcGetModeInfo;␊ |
82 | bb.ecx.rr = mode;␊ |
83 | bb.es = SEG(minfo_p);␊ |
84 | bb.edi.rr = OFF(minfo_p);␊ |
85 | bios(&bb);␊ |
86 | return(bb.eax.r.h);␊ |
87 | }␊ |
88 | ␊ |
89 | int getVBEDACFormat(unsigned char *format)␊ |
90 | {␊ |
91 | bb.intno = 0x10;␊ |
92 | bb.eax.rr = funcGetSetPaletteFormat;␊ |
93 | bb.ebx.r.l = subfuncGet;␊ |
94 | bios(&bb);␊ |
95 | *format = bb.ebx.r.h;␊ |
96 | return(bb.eax.r.h);␊ |
97 | }␊ |
98 | ␊ |
99 | int setVBEDACFormat(unsigned char format)␊ |
100 | {␊ |
101 | bb.intno = 0x10;␊ |
102 | bb.eax.rr = funcGetSetPaletteFormat;␊ |
103 | bb.ebx.r.l = subfuncSet;␊ |
104 | bb.ebx.r.h = format;␊ |
105 | bios(&bb);␊ |
106 | return(bb.eax.r.h);␊ |
107 | }␊ |
108 | ␊ |
109 | /*␊ |
110 | *EDID/DDC Readings - AutoResolution␊ |
111 | */␊ |
112 | int getEDID( void *ddcblock, uint8_t blocksleft )␊ |
113 | {␊ |
114 | ␉bb.intno = 0x10;␊ |
115 | ␉bb.eax.rr = FUNC_GET_EDID;␊ |
116 | ␉bb.ebx.r.l = SERVICE_READ_EDID;␊ |
117 | ␉bb.es = SEG( ddcblock );␊ |
118 | ␉bb.edi.rr = OFF( ddcblock );␊ |
119 | ␉bb.edx.rr = blocksleft;␊ |
120 | ␉bios( &bb );␊ |
121 | ␉return( bb.eax.r.h );␊ |
122 | }␊ |
123 | ␊ |
124 | /*␊ |
125 | * Default GTF parameter values.␊ |
126 | */␊ |
127 | #define kCellGranularity 8.0 // character cell granularity␊ |
128 | #define kMinVSyncPlusBP 550.0 // min VSync + BP interval (us)␊ |
129 | #define kMinFrontPorch 1.0 // minimum front porch in lines(V)/cells(H)␊ |
130 | #define kVSyncLines 3.0 // width of VSync in lines␊ |
131 | #define kHSyncWidth 8.0 // HSync as a percent of total line width␊ |
132 | #define kC 30.0 // C = (C'-J) * (K/256) + J␊ |
133 | #define kM 300.0 // M = K/256 * M'␊ |
134 | ␊ |
135 | int Round(double f)␊ |
136 | {␊ |
137 | ␉return (int)(f + 0.5);␊ |
138 | }␊ |
139 | ␊ |
140 | /*␊ |
141 | * from http://www.azillionmonkeys.com/qed/sqroot.html␊ |
142 | */␊ |
143 | ␊ |
144 | double Sqrt( double y )␊ |
145 | {␊ |
146 | ␉double x, z, tempf;␊ |
147 | ␉unsigned long *tfptr = ((unsigned long *)&tempf) + 1;␊ |
148 | ␉␊ |
149 | ␉tempf = y;␊ |
150 | ␉*tfptr = (0xbfcdd90a - *tfptr)>>1; /* estimate of 1/sqrt(y) */␊ |
151 | ␉x = tempf;␊ |
152 | ␉z = y*0.5; /* hoist out the “/2” */␊ |
153 | ␉x = (1.5*x) - (x*x)*(x*z); /* iteration formula */␊ |
154 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
155 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
156 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
157 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
158 | ␉return x*y;␊ |
159 | }␊ |
160 | ␊ |
161 | int generateCRTCTiming( unsigned short width,␊ |
162 | unsigned short height,␊ |
163 | unsigned long paramValue, ␊ |
164 | int paramType,␊ |
165 | VBECRTCInfoBlock * timing )␊ |
166 | {␊ |
167 | double h_period_est, h_freq, h_period, h_total_pixels, h_sync_pixels;␊ |
168 | double h_active_pixels, h_ideal_duty_cycle, h_blank_pixels, pixel_freq = 0;␊ |
169 | double v_sync_plus_bp = 0, v_total_lines = 0, v_field_rate_est, v_frame_rate = 0;␊ |
170 | const double h_pixels = (double) width;␊ |
171 | const double v_lines = (double) height;␊ |
172 | ␊ |
173 | enum {␊ |
174 | left_margin_pixels = 0,␊ |
175 | right_margin_pixels = 0,␊ |
176 | top_margin_lines = 0,␊ |
177 | bot_margin_lines = 0,␊ |
178 | interlace = 0␊ |
179 | };␊ |
180 | ␊ |
181 | // Total number of active pixels in image and both margins␊ |
182 | h_active_pixels = h_pixels + left_margin_pixels + right_margin_pixels;␊ |
183 | ␊ |
184 | if (paramType == kCRTCParamPixelClock)␊ |
185 | {␊ |
186 | // Pixel clock provided in MHz␊ |
187 | pixel_freq = (double) paramValue / 1000000;␊ |
188 | ␊ |
189 | // Ideal horizontal period from the blanking duty cycle equation␊ |
190 | h_period = ((kC - 100) + (Sqrt(((100 - kC) * (100 - kC)) + (0.4 * kM *␊ |
191 | (h_active_pixels + right_margin_pixels + left_margin_pixels) /␊ |
192 | pixel_freq)))) / 2.0 / kM * 1000;␊ |
193 | }␊ |
194 | else /* kCRTCParamRefreshRate */␊ |
195 | {␊ |
196 | double v_field_rate_in = (double) paramValue;␊ |
197 | ␊ |
198 | // Estimate the horizontal period␊ |
199 | h_period_est = ((1 / v_field_rate_in) - kMinVSyncPlusBP / 1000000) /␊ |
200 | (v_lines + (2 * top_margin_lines) + kMinFrontPorch + interlace) * ␊ |
201 | 1000000;␊ |
202 | ␊ |
203 | // Number of lines in Vsync + back porch␊ |
204 | v_sync_plus_bp = Round(kMinVSyncPlusBP / h_period_est);␊ |
205 | ␊ |
206 | // Total number of lines in Vetical field period␊ |
207 | v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊ |
208 | v_sync_plus_bp + interlace + kMinFrontPorch;␊ |
209 | ␊ |
210 | // Estimate the vertical field frequency␊ |
211 | v_field_rate_est = 1 / h_period_est / v_total_lines * 1000000;␊ |
212 | ␊ |
213 | // Find the actual horizontal period␊ |
214 | h_period = h_period_est / (v_field_rate_in / v_field_rate_est);␊ |
215 | ␊ |
216 | // Find the vertical frame rate (no interlace)␊ |
217 | v_frame_rate = 1 / h_period / v_total_lines * 1000000;␊ |
218 | }␊ |
219 | ␊ |
220 | // Ideal blanking duty cycle from the blanking duty cycle equation␊ |
221 | h_ideal_duty_cycle = kC - (kM * h_period / 1000);␊ |
222 | ␊ |
223 | // Number of pixels in the blanking time to the nearest double character cell␊ |
224 | h_blank_pixels = Round(h_active_pixels * h_ideal_duty_cycle /␊ |
225 | (100 - h_ideal_duty_cycle) / (2 * kCellGranularity)) *␊ |
226 | (2 * kCellGranularity);␊ |
227 | ␊ |
228 | // Total number of horizontal pixels␊ |
229 | h_total_pixels = h_active_pixels + h_blank_pixels;␊ |
230 | ␊ |
231 | if (paramType == kCRTCParamPixelClock)␊ |
232 | {␊ |
233 | // Horizontal frequency␊ |
234 | h_freq = pixel_freq / h_total_pixels * 1000;␊ |
235 | ␊ |
236 | // Number of lines in V sync + back porch␊ |
237 | v_sync_plus_bp = Round(kMinVSyncPlusBP * h_freq / 1000);␊ |
238 | ␊ |
239 | // Total number of lines in vertical field period␊ |
240 | v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊ |
241 | interlace + v_sync_plus_bp + kMinFrontPorch;␊ |
242 | ␊ |
243 | // Vertical frame frequency␊ |
244 | v_frame_rate = Round(h_freq / v_total_lines * 1000);␊ |
245 | }␊ |
246 | else␊ |
247 | {␊ |
248 | // Find pixel clock frequency␊ |
249 | pixel_freq = Round(h_total_pixels / h_period);␊ |
250 | }␊ |
251 | ␊ |
252 | h_sync_pixels = Round(h_total_pixels * kHSyncWidth / 100 / kCellGranularity) *␊ |
253 | kCellGranularity;␊ |
254 | ␊ |
255 | timing->HTotal = h_total_pixels;␊ |
256 | timing->HSyncStart = h_active_pixels + (h_blank_pixels / 2) - h_sync_pixels;␊ |
257 | timing->HSyncEnd = timing->HSyncStart + h_sync_pixels;␊ |
258 | timing->VTotal = v_total_lines;␊ |
259 | timing->VSyncStart = v_total_lines - v_sync_plus_bp;␊ |
260 | timing->VSyncEnd = timing->VSyncStart + kVSyncLines;␊ |
261 | timing->Flags = kCRTCNegativeHorizontalSync;␊ |
262 | timing->PixelClock = pixel_freq * 1000000;␊ |
263 | timing->RefreshRate = v_frame_rate * 100;␊ |
264 | ␊ |
265 | return 0;␊ |
266 | }␊ |
267 | ␊ |
268 | int setVBEMode(unsigned short mode, const VBECRTCInfoBlock * timing)␊ |
269 | {␊ |
270 | bb.intno = 0x10;␊ |
271 | bb.eax.rr = funcSetMode;␊ |
272 | bb.ebx.rr = mode;␊ |
273 | if (timing) {␊ |
274 | bb.es = SEG(timing);␊ |
275 | bb.edi.rr = OFF(timing);␊ |
276 | }␊ |
277 | bios(&bb);␊ |
278 | return(bb.eax.r.h);␊ |
279 | }␊ |
280 | ␊ |
281 | int setVBEPalette(void *palette)␊ |
282 | {␊ |
283 | bb.intno = 0x10;␊ |
284 | bb.eax.rr = funcGetSetPaletteData;␊ |
285 | bb.ebx.r.l = subfuncSet;␊ |
286 | bb.ecx.rr = 256;␊ |
287 | bb.edx.rr = 0;␊ |
288 | bb.es = SEG(palette);␊ |
289 | bb.edi.rr = OFF(palette);␊ |
290 | bios(&bb);␊ |
291 | return(bb.eax.r.h);␊ |
292 | }␊ |
293 | ␊ |
294 | int getVBEPalette(void *palette)␊ |
295 | {␊ |
296 | bb.intno = 0x10;␊ |
297 | bb.eax.rr = funcGetSetPaletteData;␊ |
298 | bb.ebx.r.l = subfuncGet;␊ |
299 | bb.ecx.rr = 256;␊ |
300 | bb.edx.rr = 0;␊ |
301 | bb.es = SEG(palette);␊ |
302 | bb.edi.rr = OFF(palette);␊ |
303 | bios(&bb);␊ |
304 | return(bb.eax.r.h);␊ |
305 | }␊ |
306 | ␊ |
307 | int getVBECurrentMode(unsigned short *mode)␊ |
308 | {␊ |
309 | bb.intno = 0x10;␊ |
310 | bb.eax.rr = funcGetCurrentMode;␊ |
311 | bios(&bb);␊ |
312 | *mode = bb.ebx.rr;␊ |
313 | return(bb.eax.r.h);␊ |
314 | }␊ |
315 | ␊ |
316 | int getVBEPixelClock(unsigned short mode, unsigned long * pixelClock)␊ |
317 | {␊ |
318 | bb.intno = 0x10;␊ |
319 | bb.eax.rr = funcGetSetPixelClock;␊ |
320 | bb.ebx.r.l = 0;␊ |
321 | bb.ecx.rx = *pixelClock;␊ |
322 | bb.edx.rr = mode;␊ |
323 | bios(&bb);␊ |
324 | *pixelClock = bb.ecx.rx;␊ |
325 | return(bb.eax.r.h);␊ |
326 | }␊ |
327 | |