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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 "vbe.h"␊
31␊
32/* ␊
33 * Various inline routines for video I/O␊
34 */␊
35static inline void␊
36outi (int port, int index, int val)␊
37{␊
38 outw (port, (val << 8) | index);␊
39}␊
40␊
41static inline void␊
42outib (int port, int index, int val)␊
43{␊
44 outb (port, index);␊
45 outb (port + 1, val);␊
46}␊
47␊
48static inline int␊
49ini (int port, int index)␊
50{␊
51 outb (port, index);␊
52 return inb (port + 1);␊
53}␊
54␊
55static inline void␊
56rmwi (int port, int index, int clear, int set)␊
57{␊
58 outb (port, index);␊
59 outb (port + 1, (inb (port + 1) & ~clear) | set);␊
60}␊
61␊
62/*␊
63 * Globals␊
64 */␊
65static biosBuf_t bb;␊
66␊
67int getEDID( void * edidBlock, UInt8 block)␊
68{␊
69␉bzero(&bb, sizeof(bb));␊
70 bb.intno = 0x10;␊
71 bb.eax.rr = funcGetEDID;␊
72␉bb.ebx.r.l= 0x01;␊
73␉bb.edx.rr = block;␊
74␉␊
75 bb.es = SEG( edidBlock );␊
76 bb.edi.rr = OFF( edidBlock );␊
77␉␊
78 bios( &bb );␊
79 return(bb.eax.r.h);␊
80}␊
81␊
82int getVBEInfo( void * infoBlock )␊
83{␊
84 bb.intno = 0x10;␊
85 bb.eax.rr = funcGetControllerInfo;␊
86 bb.es = SEG( infoBlock );␊
87 bb.edi.rr = OFF( infoBlock );␊
88 bios( &bb );␊
89 return(bb.eax.r.h);␊
90}␊
91␊
92int getVBEModeInfo( int mode, void * minfo_p )␊
93{␊
94 bb.intno = 0x10;␊
95 bb.eax.rr = funcGetModeInfo;␊
96 bb.ecx.rr = mode;␊
97 bb.es = SEG(minfo_p);␊
98 bb.edi.rr = OFF(minfo_p);␊
99 bios(&bb);␊
100 return(bb.eax.r.h);␊
101}␊
102␊
103int getVBEDACFormat(unsigned char *format)␊
104{␊
105 bb.intno = 0x10;␊
106 bb.eax.rr = funcGetSetPaletteFormat;␊
107 bb.ebx.r.l = subfuncGet;␊
108 bios(&bb);␊
109 *format = bb.ebx.r.h;␊
110 return(bb.eax.r.h);␊
111}␊
112␊
113int setVBEDACFormat(unsigned char format)␊
114{␊
115 bb.intno = 0x10;␊
116 bb.eax.rr = funcGetSetPaletteFormat;␊
117 bb.ebx.r.l = subfuncSet;␊
118 bb.ebx.r.h = format;␊
119 bios(&bb);␊
120 return(bb.eax.r.h);␊
121}␊
122␊
123/*␊
124 * Default GTF parameter values.␊
125 */␊
126#define kCellGranularity 8.0 // character cell granularity␊
127#define kMinVSyncPlusBP 550.0 // min VSync + BP interval (us)␊
128#define kMinFrontPorch 1.0 // minimum front porch in lines(V)/cells(H)␊
129#define kVSyncLines 3.0 // width of VSync in lines␊
130#define kHSyncWidth 8.0 // HSync as a percent of total line width␊
131#define kC 30.0 // C = (C'-J) * (K/256) + J␊
132#define kM 300.0 // M = K/256 * M'␊
133␊
134int Round(double f)␊
135{␊
136␉return (int)(f + 0.5);␊
137}␊
138␊
139/*␊
140 * from http://www.azillionmonkeys.com/qed/sqroot.html␊
141 */␊
142␊
143double Sqrt( double y )␊
144{␊
145␉double x, z, tempf;␊
146␉unsigned long *tfptr = ((unsigned long *)&tempf) + 1;␊
147␉␊
148␉tempf = y;␊
149␉*tfptr = (0xbfcdd90a - *tfptr)>>1; /* estimate of 1/sqrt(y) */␊
150␉x = tempf;␊
151␉z = y*0.5; /* hoist out the “/2” */␊
152␉x = (1.5*x) - (x*x)*(x*z); /* iteration formula */␊
153␉x = (1.5*x) - (x*x)*(x*z);␊
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␉return x*y;␊
158}␊
159␊
160int generateCRTCTiming( unsigned short width,␊
161 unsigned short height,␊
162 unsigned long paramValue, ␊
163 int paramType,␊
164 VBECRTCInfoBlock * timing )␊
165{␊
166 double h_period_est, h_freq, h_period, h_total_pixels, h_sync_pixels;␊
167 double h_active_pixels, h_ideal_duty_cycle, h_blank_pixels, pixel_freq = 0;␊
168 double v_sync_plus_bp = 0, v_total_lines = 0, v_field_rate_est, v_frame_rate = 0;␊
169 const double h_pixels = (double) width;␊
170 const double v_lines = (double) height;␊
171␊
172 enum {␊
173 left_margin_pixels = 0,␊
174 right_margin_pixels = 0,␊
175 top_margin_lines = 0,␊
176 bot_margin_lines = 0,␊
177 interlace = 0␊
178 };␊
179␊
180 // Total number of active pixels in image and both margins␊
181 h_active_pixels = h_pixels + left_margin_pixels + right_margin_pixels;␊
182␊
183 if (paramType == kCRTCParamPixelClock)␊
184 {␊
185 // Pixel clock provided in MHz␊
186 pixel_freq = (double) paramValue / 1000000;␊
187␊
188 // Ideal horizontal period from the blanking duty cycle equation␊
189 h_period = ((kC - 100) + (Sqrt(((100 - kC) * (100 - kC)) + (0.4 * kM *␊
190 (h_active_pixels + right_margin_pixels + left_margin_pixels) /␊
191 pixel_freq)))) / 2.0 / kM * 1000;␊
192 }␊
193 else /* kCRTCParamRefreshRate */␊
194 {␊
195 double v_field_rate_in = (double) paramValue;␊
196␊
197 // Estimate the horizontal period␊
198 h_period_est = ((1 / v_field_rate_in) - kMinVSyncPlusBP / 1000000) /␊
199 (v_lines + (2 * top_margin_lines) + kMinFrontPorch + interlace) * ␊
200 1000000;␊
201␊
202 // Number of lines in Vsync + back porch␊
203 v_sync_plus_bp = Round(kMinVSyncPlusBP / h_period_est);␊
204␊
205 // Total number of lines in Vetical field period␊
206 v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊
207 v_sync_plus_bp + interlace + kMinFrontPorch;␊
208␊
209 // Estimate the vertical field frequency␊
210 v_field_rate_est = 1 / h_period_est / v_total_lines * 1000000;␊
211␊
212 // Find the actual horizontal period␊
213 h_period = h_period_est / (v_field_rate_in / v_field_rate_est);␊
214␊
215 // Find the vertical frame rate (no interlace)␊
216 v_frame_rate = 1 / h_period / v_total_lines * 1000000;␊
217 }␊
218␊
219 // Ideal blanking duty cycle from the blanking duty cycle equation␊
220 h_ideal_duty_cycle = kC - (kM * h_period / 1000);␊
221␊
222 // Number of pixels in the blanking time to the nearest double character cell␊
223 h_blank_pixels = Round(h_active_pixels * h_ideal_duty_cycle /␊
224 (100 - h_ideal_duty_cycle) / (2 * kCellGranularity)) *␊
225 (2 * kCellGranularity);␊
226␊
227 // Total number of horizontal pixels␊
228 h_total_pixels = h_active_pixels + h_blank_pixels;␊
229␊
230 if (paramType == kCRTCParamPixelClock)␊
231 {␊
232 // Horizontal frequency␊
233 h_freq = pixel_freq / h_total_pixels * 1000;␊
234␊
235 // Number of lines in V sync + back porch␊
236 v_sync_plus_bp = Round(kMinVSyncPlusBP * h_freq / 1000);␊
237␊
238 // Total number of lines in vertical field period␊
239 v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊
240 interlace + v_sync_plus_bp + kMinFrontPorch;␊
241␊
242 // Vertical frame frequency␊
243 v_frame_rate = Round(h_freq / v_total_lines * 1000);␊
244 }␊
245 else␊
246 {␊
247 // Find pixel clock frequency␊
248 pixel_freq = Round(h_total_pixels / h_period);␊
249 }␊
250␊
251 h_sync_pixels = Round(h_total_pixels * kHSyncWidth / 100 / kCellGranularity) *␊
252 kCellGranularity;␊
253␊
254 timing->HTotal = h_total_pixels;␊
255 timing->HSyncStart = h_active_pixels + (h_blank_pixels / 2) - h_sync_pixels;␊
256 timing->HSyncEnd = timing->HSyncStart + h_sync_pixels;␊
257 timing->VTotal = v_total_lines;␊
258 timing->VSyncStart = v_total_lines - v_sync_plus_bp;␊
259 timing->VSyncEnd = timing->VSyncStart + kVSyncLines;␊
260 timing->Flags = kCRTCNegativeHorizontalSync;␊
261 timing->PixelClock = pixel_freq * 1000000;␊
262 timing->RefreshRate = v_frame_rate * 100;␊
263␊
264 return 0;␊
265}␊
266␊
267int setVBEMode(unsigned short mode, const VBECRTCInfoBlock * timing)␊
268{␊
269 bb.intno = 0x10;␊
270 bb.eax.rr = funcSetMode;␊
271 bb.ebx.rr = mode;␊
272 if (timing) {␊
273 bb.es = SEG(timing);␊
274 bb.edi.rr = OFF(timing);␊
275 }␊
276 bios(&bb);␊
277 return(bb.eax.r.h);␊
278}␊
279␊
280int setVBEPalette(void *palette)␊
281{␊
282 bb.intno = 0x10;␊
283 bb.eax.rr = funcGetSetPaletteData;␊
284 bb.ebx.r.l = subfuncSet;␊
285 bb.ecx.rr = 256;␊
286 bb.edx.rr = 0;␊
287 bb.es = SEG(palette);␊
288 bb.edi.rr = OFF(palette);␊
289 bios(&bb);␊
290 return(bb.eax.r.h);␊
291}␊
292␊
293int getVBEPalette(void *palette)␊
294{␊
295 bb.intno = 0x10;␊
296 bb.eax.rr = funcGetSetPaletteData;␊
297 bb.ebx.r.l = subfuncGet;␊
298 bb.ecx.rr = 256;␊
299 bb.edx.rr = 0;␊
300 bb.es = SEG(palette);␊
301 bb.edi.rr = OFF(palette);␊
302 bios(&bb);␊
303 return(bb.eax.r.h);␊
304}␊
305␊
306int getVBECurrentMode(unsigned short *mode)␊
307{␊
308 bb.intno = 0x10;␊
309 bb.eax.rr = funcGetCurrentMode;␊
310 bios(&bb);␊
311 *mode = bb.ebx.rr;␊
312 return(bb.eax.r.h);␊
313}␊
314␊
315int getVBEPixelClock(unsigned short mode, unsigned long * pixelClock)␊
316{␊
317 bb.intno = 0x10;␊
318 bb.eax.rr = funcGetSetPixelClock;␊
319 bb.ebx.r.l = 0;␊
320 bb.ecx.rx = *pixelClock;␊
321 bb.edx.rr = mode;␊
322 bios(&bb);␊
323 *pixelClock = bb.ecx.rx;␊
324 return(bb.eax.r.h);␊
325}␊
326

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