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Source at commit 1137 created 13 years 7 days ago. By meklort, Applies patch in issue #62 to trunk - Adds skip_partno support for multiboot bootloaders. | |
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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 | * Globals␊ |
34 | */␊ |
35 | static biosBuf_t bb;␊ |
36 | ␊ |
37 | int getVBEInfo( void * infoBlock )␊ |
38 | {␊ |
39 | bb.intno = 0x10;␊ |
40 | bb.eax.rr = funcGetControllerInfo;␊ |
41 | bb.es = SEG( infoBlock );␊ |
42 | bb.edi.rr = OFF( infoBlock );␊ |
43 | bios( &bb );␊ |
44 | return(bb.eax.r.h);␊ |
45 | }␊ |
46 | ␊ |
47 | int getVBEModeInfo( int mode, void * minfo_p )␊ |
48 | {␊ |
49 | bb.intno = 0x10;␊ |
50 | bb.eax.rr = funcGetModeInfo;␊ |
51 | bb.ecx.rr = mode;␊ |
52 | bb.es = SEG(minfo_p);␊ |
53 | bb.edi.rr = OFF(minfo_p);␊ |
54 | bios(&bb);␊ |
55 | return(bb.eax.r.h);␊ |
56 | }␊ |
57 | #if UNUSED␊ |
58 | int getVBEDACFormat(unsigned char *format)␊ |
59 | {␊ |
60 | bb.intno = 0x10;␊ |
61 | bb.eax.rr = funcGetSetPaletteFormat;␊ |
62 | bb.ebx.r.l = subfuncGet;␊ |
63 | bios(&bb);␊ |
64 | *format = bb.ebx.r.h;␊ |
65 | return(bb.eax.r.h);␊ |
66 | }␊ |
67 | ␊ |
68 | int setVBEDACFormat(unsigned char format)␊ |
69 | {␊ |
70 | bb.intno = 0x10;␊ |
71 | bb.eax.rr = funcGetSetPaletteFormat;␊ |
72 | bb.ebx.r.l = subfuncSet;␊ |
73 | bb.ebx.r.h = format;␊ |
74 | bios(&bb);␊ |
75 | return(bb.eax.r.h);␊ |
76 | }␊ |
77 | #endif␊ |
78 | ␊ |
79 | int getEDID( void * edidBlock, UInt8 block)␊ |
80 | {␊ |
81 | ␉bzero(&bb, sizeof(bb));␊ |
82 | bb.intno = 0x10;␊ |
83 | bb.eax.rr = funcGetEDID;␊ |
84 | ␉bb.ebx.r.l= 0x01;␊ |
85 | ␉bb.edx.rr = block;␊ |
86 | ␉␊ |
87 | bb.es = SEG( edidBlock );␊ |
88 | bb.edi.rr = OFF( edidBlock );␊ |
89 | ␉␊ |
90 | bios( &bb );␊ |
91 | return(bb.eax.r.h);␊ |
92 | }␊ |
93 | ␊ |
94 | ␊ |
95 | ␊ |
96 | /*␊ |
97 | * Default GTF parameter values.␊ |
98 | */␊ |
99 | #define kCellGranularity 8.0 // character cell granularity␊ |
100 | #define kMinVSyncPlusBP 550.0 // min VSync + BP interval (us)␊ |
101 | #define kMinFrontPorch 1.0 // minimum front porch in lines(V)/cells(H)␊ |
102 | #define kVSyncLines 3.0 // width of VSync in lines␊ |
103 | #define kHSyncWidth 8.0 // HSync as a percent of total line width␊ |
104 | #define kC 30.0 // C = (C'-J) * (K/256) + J␊ |
105 | #define kM 300.0 // M = K/256 * M'␊ |
106 | ␊ |
107 | int Round(double f)␊ |
108 | {␊ |
109 | ␉return (int)(f + 0.5);␊ |
110 | }␊ |
111 | ␊ |
112 | /*␊ |
113 | * from http://www.azillionmonkeys.com/qed/sqroot.html␊ |
114 | */␊ |
115 | #if UNUSED␊ |
116 | double Sqrt( double y )␊ |
117 | {␊ |
118 | ␉double x, z, tempf;␊ |
119 | ␉unsigned long *tfptr = ((unsigned long *)&tempf) + 1;␊ |
120 | ␉␊ |
121 | ␉tempf = y;␊ |
122 | ␉*tfptr = (0xbfcdd90a - *tfptr)>>1; /* estimate of 1/sqrt(y) */␊ |
123 | ␉x = tempf;␊ |
124 | ␉z = y*0.5; /* hoist out the “/2” */␊ |
125 | ␉x = (1.5*x) - (x*x)*(x*z); /* iteration formula */␊ |
126 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
127 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
128 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
129 | ␉x = (1.5*x) - (x*x)*(x*z);␊ |
130 | ␉return x*y;␊ |
131 | }␊ |
132 | ␊ |
133 | int generateCRTCTiming( unsigned short width,␊ |
134 | unsigned short height,␊ |
135 | unsigned long paramValue, ␊ |
136 | int paramType,␊ |
137 | VBECRTCInfoBlock * timing )␊ |
138 | {␊ |
139 | double h_period_est, h_freq, h_period, h_total_pixels, h_sync_pixels;␊ |
140 | double h_active_pixels, h_ideal_duty_cycle, h_blank_pixels, pixel_freq = 0;␊ |
141 | double v_sync_plus_bp = 0, v_total_lines = 0, v_field_rate_est, v_frame_rate = 0;␊ |
142 | const double h_pixels = (double) width;␊ |
143 | const double v_lines = (double) height;␊ |
144 | ␊ |
145 | enum {␊ |
146 | left_margin_pixels = 0,␊ |
147 | right_margin_pixels = 0,␊ |
148 | top_margin_lines = 0,␊ |
149 | bot_margin_lines = 0,␊ |
150 | interlace = 0␊ |
151 | };␊ |
152 | ␊ |
153 | // Total number of active pixels in image and both margins␊ |
154 | h_active_pixels = h_pixels + left_margin_pixels + right_margin_pixels;␊ |
155 | ␊ |
156 | if (paramType == kCRTCParamPixelClock)␊ |
157 | {␊ |
158 | // Pixel clock provided in MHz␊ |
159 | pixel_freq = (double) paramValue / 1000000;␊ |
160 | ␊ |
161 | // Ideal horizontal period from the blanking duty cycle equation␊ |
162 | h_period = ((kC - 100) + (Sqrt(((100 - kC) * (100 - kC)) + (0.4 * kM *␊ |
163 | (h_active_pixels + right_margin_pixels + left_margin_pixels) /␊ |
164 | pixel_freq)))) / 2.0 / kM * 1000;␊ |
165 | }␊ |
166 | else /* kCRTCParamRefreshRate */␊ |
167 | {␊ |
168 | double v_field_rate_in = (double) paramValue;␊ |
169 | ␊ |
170 | // Estimate the horizontal period␊ |
171 | h_period_est = ((1 / v_field_rate_in) - kMinVSyncPlusBP / 1000000) /␊ |
172 | (v_lines + (2 * top_margin_lines) + kMinFrontPorch + interlace) * ␊ |
173 | 1000000;␊ |
174 | ␊ |
175 | // Number of lines in Vsync + back porch␊ |
176 | v_sync_plus_bp = Round(kMinVSyncPlusBP / h_period_est);␊ |
177 | ␊ |
178 | // Total number of lines in Vetical field period␊ |
179 | v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊ |
180 | v_sync_plus_bp + interlace + kMinFrontPorch;␊ |
181 | ␊ |
182 | // Estimate the vertical field frequency␊ |
183 | v_field_rate_est = 1 / h_period_est / v_total_lines * 1000000;␊ |
184 | ␊ |
185 | // Find the actual horizontal period␊ |
186 | h_period = h_period_est / (v_field_rate_in / v_field_rate_est);␊ |
187 | ␊ |
188 | // Find the vertical frame rate (no interlace)␊ |
189 | v_frame_rate = 1 / h_period / v_total_lines * 1000000;␊ |
190 | }␊ |
191 | ␊ |
192 | // Ideal blanking duty cycle from the blanking duty cycle equation␊ |
193 | h_ideal_duty_cycle = kC - (kM * h_period / 1000);␊ |
194 | ␊ |
195 | // Number of pixels in the blanking time to the nearest double character cell␊ |
196 | h_blank_pixels = Round(h_active_pixels * h_ideal_duty_cycle /␊ |
197 | (100 - h_ideal_duty_cycle) / (2 * kCellGranularity)) *␊ |
198 | (2 * kCellGranularity);␊ |
199 | ␊ |
200 | // Total number of horizontal pixels␊ |
201 | h_total_pixels = h_active_pixels + h_blank_pixels;␊ |
202 | ␊ |
203 | if (paramType == kCRTCParamPixelClock)␊ |
204 | {␊ |
205 | // Horizontal frequency␊ |
206 | h_freq = pixel_freq / h_total_pixels * 1000;␊ |
207 | ␊ |
208 | // Number of lines in V sync + back porch␊ |
209 | v_sync_plus_bp = Round(kMinVSyncPlusBP * h_freq / 1000);␊ |
210 | ␊ |
211 | // Total number of lines in vertical field period␊ |
212 | v_total_lines = v_lines + top_margin_lines + bot_margin_lines +␊ |
213 | interlace + v_sync_plus_bp + kMinFrontPorch;␊ |
214 | ␊ |
215 | // Vertical frame frequency␊ |
216 | v_frame_rate = Round(h_freq / v_total_lines * 1000);␊ |
217 | }␊ |
218 | else␊ |
219 | {␊ |
220 | // Find pixel clock frequency␊ |
221 | pixel_freq = Round(h_total_pixels / h_period);␊ |
222 | }␊ |
223 | ␊ |
224 | h_sync_pixels = Round(h_total_pixels * kHSyncWidth / 100 / kCellGranularity) *␊ |
225 | kCellGranularity;␊ |
226 | ␊ |
227 | timing->HTotal = h_total_pixels;␊ |
228 | timing->HSyncStart = h_active_pixels + (h_blank_pixels / 2) - h_sync_pixels;␊ |
229 | timing->HSyncEnd = timing->HSyncStart + h_sync_pixels;␊ |
230 | timing->VTotal = v_total_lines;␊ |
231 | timing->VSyncStart = v_total_lines - v_sync_plus_bp;␊ |
232 | timing->VSyncEnd = timing->VSyncStart + kVSyncLines;␊ |
233 | timing->Flags = kCRTCNegativeHorizontalSync;␊ |
234 | timing->PixelClock = pixel_freq * 1000000;␊ |
235 | timing->RefreshRate = v_frame_rate * 100;␊ |
236 | ␊ |
237 | return 0;␊ |
238 | }␊ |
239 | ␊ |
240 | #endif ␊ |
241 | ␊ |
242 | int setVBEMode(unsigned short mode, const VBECRTCInfoBlock * timing)␊ |
243 | {␊ |
244 | bb.intno = 0x10;␊ |
245 | bb.eax.rr = funcSetMode;␊ |
246 | bb.ebx.rr = mode;␊ |
247 | if (timing) {␊ |
248 | bb.es = SEG(timing);␊ |
249 | bb.edi.rr = OFF(timing);␊ |
250 | }␊ |
251 | bios(&bb);␊ |
252 | return(bb.eax.r.h);␊ |
253 | }␊ |
254 | ␊ |
255 | ␊ |
256 | int setVBEPalette(void *palette)␊ |
257 | {␊ |
258 | bb.intno = 0x10;␊ |
259 | bb.eax.rr = funcGetSetPaletteData;␊ |
260 | bb.ebx.r.l = subfuncSet;␊ |
261 | bb.ecx.rr = 256;␊ |
262 | bb.edx.rr = 0;␊ |
263 | bb.es = SEG(palette);␊ |
264 | bb.edi.rr = OFF(palette);␊ |
265 | bios(&bb);␊ |
266 | return(bb.eax.r.h);␊ |
267 | }␊ |
268 | ␊ |
269 | #if UNUSED␊ |
270 | ␊ |
271 | int getVBEPalette(void *palette)␊ |
272 | {␊ |
273 | bb.intno = 0x10;␊ |
274 | bb.eax.rr = funcGetSetPaletteData;␊ |
275 | bb.ebx.r.l = subfuncGet;␊ |
276 | bb.ecx.rr = 256;␊ |
277 | bb.edx.rr = 0;␊ |
278 | bb.es = SEG(palette);␊ |
279 | bb.edi.rr = OFF(palette);␊ |
280 | bios(&bb);␊ |
281 | return(bb.eax.r.h);␊ |
282 | }␊ |
283 | ␊ |
284 | int getVBECurrentMode(unsigned short *mode)␊ |
285 | {␊ |
286 | bb.intno = 0x10;␊ |
287 | bb.eax.rr = funcGetCurrentMode;␊ |
288 | bios(&bb);␊ |
289 | *mode = bb.ebx.rr;␊ |
290 | return(bb.eax.r.h);␊ |
291 | }␊ |
292 | ␊ |
293 | int getVBEPixelClock(unsigned short mode, unsigned long * pixelClock)␊ |
294 | {␊ |
295 | bb.intno = 0x10;␊ |
296 | bb.eax.rr = funcGetSetPixelClock;␊ |
297 | bb.ebx.r.l = 0;␊ |
298 | bb.ecx.rx = *pixelClock;␊ |
299 | bb.edx.rr = mode;␊ |
300 | bios(&bb);␊ |
301 | *pixelClock = bb.ecx.rx;␊ |
302 | return(bb.eax.r.h);␊ |
303 | }␊ |
304 | #endif␊ |
305 |