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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 "edid.h"␊
31#include "vbe.h"␊
32␊
33/* ␊
34 * Various inline routines for video I/O␊
35 */␊
36static inline void␊
37outi (int port, int index, int val)␊
38{␊
39 outw (port, (val << 8) | index);␊
40}␊
41␊
42static inline void␊
43outib (int port, int index, int val)␊
44{␊
45 outb (port, index);␊
46 outb (port + 1, val);␊
47}␊
48␊
49static inline int␊
50ini (int port, int index)␊
51{␊
52 outb (port, index);␊
53 return inb (port + 1);␊
54}␊
55␊
56static inline void␊
57rmwi (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 */␊
66static biosBuf_t bb;␊
67␊
68int 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␊
78int 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␊
89int 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␊
99int 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␊
111 */␊
112␊
113int getEDID( void *ddcblock, uint8_t blocksleft )␊
114{␊
115␉bb.intno = 0x10;␊
116␉bb.eax.rr = FUNC_GET_EDID;␊
117␉bb.ebx.r.l = SERVICE_READ_EDID;␊
118␉bb.es = SEG( ddcblock );␊
119␉bb.edi.rr = OFF( ddcblock );␊
120␉bb.edx.rr = blocksleft;␊
121␉bios( &bb );␊
122␉return( bb.eax.r.h );␊
123}␊
124␊
125/*␊
126 * Default GTF parameter values.␊
127 */␊
128#define kCellGranularity 8.0 // character cell granularity␊
129#define kMinVSyncPlusBP 550.0 // min VSync + BP interval (us)␊
130#define kMinFrontPorch 1.0 // minimum front porch in lines(V)/cells(H)␊
131#define kVSyncLines 3.0 // width of VSync in lines␊
132#define kHSyncWidth 8.0 // HSync as a percent of total line width␊
133#define kC 30.0 // C = (C'-J) * (K/256) + J␊
134#define kM 300.0 // M = K/256 * M'␊
135␊
136int Round(double f)␊
137{␊
138␉return (int)(f + 0.5);␊
139}␊
140␊
141/*␊
142 * from http://www.azillionmonkeys.com/qed/sqroot.html␊
143 */␊
144␊
145double Sqrt( double y )␊
146{␊
147␉double x, z, tempf;␊
148␉unsigned long *tfptr = ((unsigned long *)&tempf) + 1;␊
149␉␊
150␉tempf = y;␊
151␉*tfptr = (0xbfcdd90a - *tfptr)>>1; /* estimate of 1/sqrt(y) */␊
152␉x = tempf;␊
153␉z = y*0.5; /* hoist out the “/2” */␊
154␉x = (1.5*x) - (x*x)*(x*z); /* iteration formula */␊
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␉x = (1.5*x) - (x*x)*(x*z);␊
159␉return x*y;␊
160}␊
161␊
162int generateCRTCTiming( unsigned short width,␊
163 unsigned short height,␊
164 unsigned long paramValue, ␊
165 int paramType,␊
166 VBECRTCInfoBlock * timing )␊
167{␊
168 double h_period_est, h_freq, h_period, h_total_pixels, h_sync_pixels;␊
169 double h_active_pixels, h_ideal_duty_cycle, h_blank_pixels, pixel_freq = 0;␊
170 double v_sync_plus_bp = 0, v_total_lines = 0, v_field_rate_est, v_frame_rate = 0;␊
171 const double h_pixels = (double) width;␊
172 const double v_lines = (double) height;␊
173␊
174 enum {␊
175 left_margin_pixels = 0,␊
176 right_margin_pixels = 0,␊
177 top_margin_lines = 0,␊
178 bot_margin_lines = 0,␊
179 interlace = 0␊
180 };␊
181␊
182 // Total number of active pixels in image and both margins␊
183 h_active_pixels = h_pixels + left_margin_pixels + right_margin_pixels;␊
184␊
185 if (paramType == kCRTCParamPixelClock)␊
186 {␊
187 // Pixel clock provided in MHz␊
188 pixel_freq = (double) paramValue / 1000000;␊
189␊
190 // Ideal horizontal period from the blanking duty cycle equation␊
191 h_period = ((kC - 100) + (Sqrt(((100 - kC) * (100 - kC)) + (0.4 * kM *␊
192 (h_active_pixels + right_margin_pixels + left_margin_pixels) /␊
193 pixel_freq)))) / 2.0 / kM * 1000;␊
194 }␊
195 else /* kCRTCParamRefreshRate */␊
196 {␊
197 double v_field_rate_in = (double) paramValue;␊
198␊
199 // Estimate the horizontal period␊
200 h_period_est = ((1 / v_field_rate_in) - kMinVSyncPlusBP / 1000000) /␊
201 (v_lines + (2 * top_margin_lines) + kMinFrontPorch + interlace) * ␊
202 1000000;␊
203␊
204 // Number of lines in Vsync + back porch␊
205 v_sync_plus_bp = Round(kMinVSyncPlusBP / h_period_est);␊
206␊
207 // Total number of lines in Vetical field period␊
208 v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊
209 v_sync_plus_bp + interlace + kMinFrontPorch;␊
210␊
211 // Estimate the vertical field frequency␊
212 v_field_rate_est = 1 / h_period_est / v_total_lines * 1000000;␊
213␊
214 // Find the actual horizontal period␊
215 h_period = h_period_est / (v_field_rate_in / v_field_rate_est);␊
216␊
217 // Find the vertical frame rate (no interlace)␊
218 v_frame_rate = 1 / h_period / v_total_lines * 1000000;␊
219 }␊
220␊
221 // Ideal blanking duty cycle from the blanking duty cycle equation␊
222 h_ideal_duty_cycle = kC - (kM * h_period / 1000);␊
223␊
224 // Number of pixels in the blanking time to the nearest double character cell␊
225 h_blank_pixels = Round(h_active_pixels * h_ideal_duty_cycle /␊
226 (100 - h_ideal_duty_cycle) / (2 * kCellGranularity)) *␊
227 (2 * kCellGranularity);␊
228␊
229 // Total number of horizontal pixels␊
230 h_total_pixels = h_active_pixels + h_blank_pixels;␊
231␊
232 if (paramType == kCRTCParamPixelClock)␊
233 {␊
234 // Horizontal frequency␊
235 h_freq = pixel_freq / h_total_pixels * 1000;␊
236␊
237 // Number of lines in V sync + back porch␊
238 v_sync_plus_bp = Round(kMinVSyncPlusBP * h_freq / 1000);␊
239␊
240 // Total number of lines in vertical field period␊
241 v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊
242 interlace + v_sync_plus_bp + kMinFrontPorch;␊
243␊
244 // Vertical frame frequency␊
245 v_frame_rate = Round(h_freq / v_total_lines * 1000);␊
246 }␊
247 else␊
248 {␊
249 // Find pixel clock frequency␊
250 pixel_freq = Round(h_total_pixels / h_period);␊
251 }␊
252␊
253 h_sync_pixels = Round(h_total_pixels * kHSyncWidth / 100 / kCellGranularity) *␊
254 kCellGranularity;␊
255␊
256 timing->HTotal = h_total_pixels;␊
257 timing->HSyncStart = h_active_pixels + (h_blank_pixels / 2) - h_sync_pixels;␊
258 timing->HSyncEnd = timing->HSyncStart + h_sync_pixels;␊
259 timing->VTotal = v_total_lines;␊
260 timing->VSyncStart = v_total_lines - v_sync_plus_bp;␊
261 timing->VSyncEnd = timing->VSyncStart + kVSyncLines;␊
262 timing->Flags = kCRTCNegativeHorizontalSync;␊
263 timing->PixelClock = pixel_freq * 1000000;␊
264 timing->RefreshRate = v_frame_rate * 100;␊
265␊
266 return 0;␊
267}␊
268␊
269int setVBEMode(unsigned short mode, const VBECRTCInfoBlock * timing)␊
270{␊
271 bb.intno = 0x10;␊
272 bb.eax.rr = funcSetMode;␊
273 bb.ebx.rr = mode;␊
274 if (timing) {␊
275 bb.es = SEG(timing);␊
276 bb.edi.rr = OFF(timing);␊
277 }␊
278 bios(&bb);␊
279 return(bb.eax.r.h);␊
280}␊
281␊
282int setVBEPalette(void *palette)␊
283{␊
284 bb.intno = 0x10;␊
285 bb.eax.rr = funcGetSetPaletteData;␊
286 bb.ebx.r.l = subfuncSet;␊
287 bb.ecx.rr = 256;␊
288 bb.edx.rr = 0;␊
289 bb.es = SEG(palette);␊
290 bb.edi.rr = OFF(palette);␊
291 bios(&bb);␊
292 return(bb.eax.r.h);␊
293}␊
294␊
295int getVBEPalette(void *palette)␊
296{␊
297 bb.intno = 0x10;␊
298 bb.eax.rr = funcGetSetPaletteData;␊
299 bb.ebx.r.l = subfuncGet;␊
300 bb.ecx.rr = 256;␊
301 bb.edx.rr = 0;␊
302 bb.es = SEG(palette);␊
303 bb.edi.rr = OFF(palette);␊
304 bios(&bb);␊
305 return(bb.eax.r.h);␊
306}␊
307␊
308int getVBECurrentMode(unsigned short *mode)␊
309{␊
310 bb.intno = 0x10;␊
311 bb.eax.rr = funcGetCurrentMode;␊
312 bios(&bb);␊
313 *mode = bb.ebx.rr;␊
314 return(bb.eax.r.h);␊
315}␊
316␊
317int getVBEPixelClock(unsigned short mode, unsigned long * pixelClock)␊
318{␊
319 bb.intno = 0x10;␊
320 bb.eax.rr = funcGetSetPixelClock;␊
321 bb.ebx.r.l = 0;␊
322 bb.ecx.rx = *pixelClock;␊
323 bb.edx.rr = mode;␊
324 bios(&bb);␊
325 *pixelClock = bb.ecx.rx;␊
326 return(bb.eax.r.h);␊
327}␊
328

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