1 /* $NetBSD: vesagtf.c,v 1.3 2014/03/21 22:00:00 dholland Exp $ */
4 * Copyright (c) 2006 Itronix Inc.
7 * Written by Garrett D'Amore for Itronix Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of Itronix Inc. may not be used to endorse
18 * or promote products derived from this software without specific
19 * prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS
22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 * This was derived from a userland GTF program supplied by NVIDIA.
36 * NVIDIA's original boilerplate follows.
38 * Note that I have heavily modified the program for use in the EDID
39 * kernel code for NetBSD, including removing the use of floating
40 * point operations and making significant adjustments to minimize
41 * error propagation while operating with integer only math.
43 * This has required the use of 64-bit integers in a few places, but
44 * the upshot is that for a calculation of 1920x1200x85 (as an
45 * example), the error deviates by only ~.004% relative to the
46 * floating point version. This error is *well* within VESA
51 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
52 * All rights reserved.
54 * Redistribution and use in source and binary forms, with or without
55 * modification, are permitted provided that the following conditions
58 * o Redistributions of source code must retain the above copyright
59 * notice, this list of conditions and the following disclaimer.
60 * o Redistributions in binary form must reproduce the above copyright
61 * notice, this list of conditions and the following disclaimer
62 * in the documentation and/or other materials provided with the
64 * o Neither the name of NVIDIA nor the names of its contributors
65 * may be used to endorse or promote products derived from this
66 * software without specific prior written permission.
69 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
70 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
71 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
72 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
73 * THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
74 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
75 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
76 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
77 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
78 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
79 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
80 * POSSIBILITY OF SUCH DAMAGE.
84 * This program is based on the Generalized Timing Formula(GTF TM)
85 * Standard Version: 1.0, Revision: 1.0
87 * The GTF Document contains the following Copyright information:
89 * Copyright (c) 1994, 1995, 1996 - Video Electronics Standards
90 * Association. Duplication of this document within VESA member
91 * companies for review purposes is permitted. All other rights
94 * While every precaution has been taken in the preparation
95 * of this standard, the Video Electronics Standards Association and
96 * its contributors assume no responsibility for errors or omissions,
97 * and make no warranties, expressed or implied, of functionality
98 * of suitability for any purpose. The sample code contained within
99 * this standard may be used without restriction.
103 * The GTF EXCEL(TM) SPREADSHEET, a sample (and the definitive)
104 * implementation of the GTF Timing Standard, is available at:
106 * ftp://ftp.vesa.org/pub/GTF/GTF_V1R1.xls
110 * This program takes a desired resolution and vertical refresh rate,
111 * and computes mode timings according to the GTF Timing Standard.
112 * These mode timings can then be formatted as an XFree86 modeline
113 * or a mode description for use by fbset(8).
119 * The GTF allows for computation of "margins" (the visible border
120 * surrounding the addressable video); on most non-overscan type
121 * systems, the margin period is zero. I've implemented the margin
122 * computations but not enabled it because 1) I don't really have
123 * any experience with this, and 2) neither XFree86 modelines nor
124 * fbset fb.modes provide an obvious way for margin timings to be
125 * included in their mode descriptions (needs more investigation).
127 * The GTF provides for computation of interlaced mode timings;
128 * I've implemented the computations but not enabled them, yet.
129 * I should probably enable and test this at some point.
135 * o Add support for interlaced modes.
137 * o Implement the other portions of the GTF: compute mode timings
138 * given either the desired pixel clock or the desired horizontal
141 * o It would be nice if this were more general purpose to do things
142 * outside the scope of the GTF: like generate double scan mode
143 * timings, for example.
145 * o Printing digits to the right of the decimal point when the
146 * digits are 0 annoys me.
154 #include <sys/cdefs.h>
156 __KERNEL_RCSID(0, "$NetBSD: vesagtf.c,v 1.3 2014/03/21 22:00:00 dholland Exp $");
157 #include <sys/types.h>
158 #include <sys/param.h>
159 #include <sys/systm.h>
160 #include <dev/videomode/videomode.h>
161 #include <dev/videomode/vesagtf.h>
165 #include <sys/types.h>
166 #include "videomode.h"
169 void print_xf86_mode(struct videomode
*m
);
172 #define CELL_GRAN 8 /* assumed character cell granularity */
174 /* C' and M' are part of the Blanking Duty Cycle computation */
176 * #define C_PRIME (((C - J) * K/256.0) + J)
177 * #define M_PRIME (K/256.0 * M)
181 * C' and M' multiplied by 256 to give integer math. Make sure to
182 * scale results using these back down, appropriately.
184 #define C_PRIME256(p) (((p->C - p->J) * p->K) + (p->J * 256))
185 #define M_PRIME256(p) (p->K * p->M)
187 #define DIVIDE(x,y) (((x) + ((y) / 2)) / (y))
190 * print_value() - print the result of the named computation; this is
191 * useful when comparing against the GTF EXCEL spreadsheet.
197 print_value(int n
, const char *name
, unsigned val
)
199 printf("%2d: %-27s: %u\n", n
, name
, val
);
202 #define print_value(n, name, val)
207 * vert_refresh() - as defined by the GTF Timing Standard, compute the
208 * Stage 1 Parameters using the vertical refresh frequency. In other
209 * words: input a desired resolution and desired refresh rate, and
210 * output the GTF mode timings.
212 * XXX All the code is in place to compute interlaced modes, but I don't
213 * feel like testing it right now.
215 * XXX margin computations are implemented but not tested (nor used by
216 * XFree86 of fbset mode descriptions, from what I can tell).
220 vesagtf_mode_params(unsigned h_pixels
, unsigned v_lines
, unsigned freq
,
221 struct vesagtf_params
*params
, int flags
, struct videomode
*vmp
)
223 unsigned v_field_rqd
;
225 unsigned bottom_margin
;
227 uint64_t h_period_est
;
228 unsigned vsync_plus_bp
;
229 unsigned v_back_porch __unused
;
230 unsigned total_v_lines
;
231 uint64_t v_field_est
;
233 unsigned v_field_rate
;
234 unsigned v_frame_rate __unused
;
235 unsigned left_margin
;
236 unsigned right_margin
;
237 unsigned total_active_pixels
;
238 uint64_t ideal_duty_cycle
;
240 unsigned total_pixels
;
244 unsigned h_front_porch
;
245 unsigned v_odd_front_porch_lines
;
251 /* 1. In order to give correct results, the number of horizontal
252 * pixels requested is first processed to ensure that it is divisible
253 * by the character size, by rounding it to the nearest character
256 * [H PIXELS RND] = ((ROUND([H PIXELS]/[CELL GRAN RND],0))*[CELLGRAN RND])
259 h_pixels
= DIVIDE(h_pixels
, CELL_GRAN
) * CELL_GRAN
;
261 print_value(1, "[H PIXELS RND]", h_pixels
);
264 /* 2. If interlace is requested, the number of vertical lines assumed
265 * by the calculation must be halved, as the computation calculates
266 * the number of vertical lines per field. In either case, the
267 * number of lines is rounded to the nearest integer.
269 * [V LINES RND] = IF([INT RQD?]="y", ROUND([V LINES]/2,0),
270 * ROUND([V LINES],0))
273 v_lines
= (flags
& VESAGTF_FLAG_ILACE
) ? DIVIDE(v_lines
, 2) : v_lines
;
275 print_value(2, "[V LINES RND]", v_lines
);
278 /* 3. Find the frame rate required:
280 * [V FIELD RATE RQD] = IF([INT RQD?]="y", [I/P FREQ RQD]*2,
284 v_field_rqd
= (flags
& VESAGTF_FLAG_ILACE
) ? (freq
* 2) : (freq
);
286 print_value(3, "[V FIELD RATE RQD]", v_field_rqd
);
289 /* 4. Find number of lines in Top margin:
290 * 5. Find number of lines in Bottom margin:
292 * [TOP MARGIN (LINES)] = IF([MARGINS RQD?]="Y",
293 * ROUND(([MARGIN%]/100*[V LINES RND]),0),
296 * Ditto for bottom margin. Note that instead of %, we use PPT, which
297 * is parts per thousand. This helps us with integer math.
300 top_margin
= bottom_margin
= (flags
& VESAGTF_FLAG_MARGINS
) ?
301 DIVIDE(v_lines
* params
->margin_ppt
, 1000) : 0;
303 print_value(4, "[TOP MARGIN (LINES)]", top_margin
);
304 print_value(5, "[BOT MARGIN (LINES)]", bottom_margin
);
307 /* 6. If interlace is required, then set variable [INTERLACE]=0.5:
309 * [INTERLACE]=(IF([INT RQD?]="y",0.5,0))
311 * To make this integer friendly, we use some special hacks in step
312 * 7 below. Please read those comments to understand why I am using
313 * a whole number of 1.0 instead of 0.5 here.
315 interlace
= (flags
& VESAGTF_FLAG_ILACE
) ? 1 : 0;
317 print_value(6, "[2*INTERLACE]", interlace
);
320 /* 7. Estimate the Horizontal period
322 * [H PERIOD EST] = ((1/[V FIELD RATE RQD]) - [MIN VSYNC+BP]/1000000) /
323 * ([V LINES RND] + (2*[TOP MARGIN (LINES)]) +
324 * [MIN PORCH RND]+[INTERLACE]) * 1000000
326 * To make it integer friendly, we pre-multiply the 1000000 to get to
327 * usec. This gives us:
329 * [H PERIOD EST] = ((1000000/[V FIELD RATE RQD]) - [MIN VSYNC+BP]) /
330 * ([V LINES RND] + (2 * [TOP MARGIN (LINES)]) +
331 * [MIN PORCH RND]+[INTERLACE])
333 * The other problem is that the interlace value is wrong. To get
334 * the interlace to a whole number, we multiply both the numerator and
335 * divisor by 2, so we can use a value of either 1 or 0 for the interlace
340 * [H PERIOD EST] = ((2*((1000000/[V FIELD RATE RQD]) - [MIN VSYNC+BP])) /
341 * (2*([V LINES RND] + (2*[TOP MARGIN (LINES)]) +
342 * [MIN PORCH RND]) + [2*INTERLACE]))
344 * Finally we multiply by another 1000, to get value in picosec.
345 * Why picosec? To minimize rounding errors. Gotta love integer
346 * math and error propagation.
349 h_period_est
= DIVIDE(((DIVIDE(2000000000000ULL, v_field_rqd
)) -
350 (2000000 * params
->min_vsbp
)),
351 ((2 * (v_lines
+ (2 * top_margin
) + params
->min_porch
)) + interlace
));
353 print_value(7, "[H PERIOD EST (ps)]", h_period_est
);
356 /* 8. Find the number of lines in V sync + back porch:
358 * [V SYNC+BP] = ROUND(([MIN VSYNC+BP]/[H PERIOD EST]),0)
360 * But recall that h_period_est is in psec. So multiply by 1000000.
363 vsync_plus_bp
= DIVIDE(params
->min_vsbp
* 1000000, h_period_est
);
365 print_value(8, "[V SYNC+BP]", vsync_plus_bp
);
368 /* 9. Find the number of lines in V back porch alone:
370 * [V BACK PORCH] = [V SYNC+BP] - [V SYNC RND]
372 * XXX is "[V SYNC RND]" a typo? should be [V SYNC RQD]?
375 v_back_porch
= vsync_plus_bp
- params
->vsync_rqd
;
377 print_value(9, "[V BACK PORCH]", v_back_porch
);
380 /* 10. Find the total number of lines in Vertical field period:
382 * [TOTAL V LINES] = [V LINES RND] + [TOP MARGIN (LINES)] +
383 * [BOT MARGIN (LINES)] + [V SYNC+BP] + [INTERLACE] +
387 total_v_lines
= v_lines
+ top_margin
+ bottom_margin
+ vsync_plus_bp
+
388 interlace
+ params
->min_porch
;
390 print_value(10, "[TOTAL V LINES]", total_v_lines
);
393 /* 11. Estimate the Vertical field frequency:
395 * [V FIELD RATE EST] = 1 / [H PERIOD EST] / [TOTAL V LINES] * 1000000
397 * Again, we want to pre multiply by 10^9 to convert for nsec, thereby
398 * making it usable in integer math.
402 * [V FIELD RATE EST] = 1000000000 / [H PERIOD EST] / [TOTAL V LINES]
404 * This is all scaled to get the result in uHz. Again, we're trying to
405 * minimize error propagation.
407 v_field_est
= DIVIDE(DIVIDE(1000000000000000ULL, h_period_est
),
410 print_value(11, "[V FIELD RATE EST(uHz)]", v_field_est
);
413 /* 12. Find the actual horizontal period:
415 * [H PERIOD] = [H PERIOD EST] / ([V FIELD RATE RQD] / [V FIELD RATE EST])
418 h_period
= DIVIDE(h_period_est
* v_field_est
, v_field_rqd
* 1000);
420 print_value(12, "[H PERIOD(ps)]", h_period
);
423 /* 13. Find the actual Vertical field frequency:
425 * [V FIELD RATE] = 1 / [H PERIOD] / [TOTAL V LINES] * 1000000
427 * And again, we convert to nsec ahead of time, giving us:
429 * [V FIELD RATE] = 1000000 / [H PERIOD] / [TOTAL V LINES]
431 * And another rescaling back to mHz. Gotta love it.
434 v_field_rate
= DIVIDE(1000000000000ULL, h_period
* total_v_lines
);
436 print_value(13, "[V FIELD RATE]", v_field_rate
);
439 /* 14. Find the Vertical frame frequency:
441 * [V FRAME RATE] = (IF([INT RQD?]="y", [V FIELD RATE]/2, [V FIELD RATE]))
443 * N.B. that the result here is in mHz.
446 v_frame_rate
= (flags
& VESAGTF_FLAG_ILACE
) ?
447 v_field_rate
/ 2 : v_field_rate
;
449 print_value(14, "[V FRAME RATE]", v_frame_rate
);
452 /* 15. Find number of pixels in left margin:
453 * 16. Find number of pixels in right margin:
455 * [LEFT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
456 * (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /
457 * [CELL GRAN RND]),0)) * [CELL GRAN RND],
460 * Again, we deal with margin percentages as PPT (parts per thousand).
461 * And the calculations for left and right are the same.
464 left_margin
= right_margin
= (flags
& VESAGTF_FLAG_MARGINS
) ?
465 DIVIDE(DIVIDE(h_pixels
* params
->margin_ppt
, 1000),
466 CELL_GRAN
) * CELL_GRAN
: 0;
468 print_value(15, "[LEFT MARGIN (PIXELS)]", left_margin
);
469 print_value(16, "[RIGHT MARGIN (PIXELS)]", right_margin
);
472 /* 17. Find total number of active pixels in image and left and right
475 * [TOTAL ACTIVE PIXELS] = [H PIXELS RND] + [LEFT MARGIN (PIXELS)] +
476 * [RIGHT MARGIN (PIXELS)]
479 total_active_pixels
= h_pixels
+ left_margin
+ right_margin
;
481 print_value(17, "[TOTAL ACTIVE PIXELS]", total_active_pixels
);
484 /* 18. Find the ideal blanking duty cycle from the blanking duty cycle
487 * [IDEAL DUTY CYCLE] = [C'] - ([M']*[H PERIOD]/1000)
489 * However, we have modified values for [C'] as [256*C'] and
490 * [M'] as [256*M']. Again the idea here is to get good scaling.
491 * We use 256 as the factor to make the math fast.
493 * Note that this means that we have to scale it appropriately in
494 * later calculations.
496 * The ending result is that our ideal_duty_cycle is 256000x larger
497 * than the duty cycle used by VESA. But again, this reduces error
502 ((C_PRIME256(params
) * 1000) -
503 (M_PRIME256(params
) * h_period
/ 1000000));
505 print_value(18, "[IDEAL DUTY CYCLE]", ideal_duty_cycle
);
508 /* 19. Find the number of pixels in the blanking time to the nearest
509 * double character cell:
511 * [H BLANK (PIXELS)] = (ROUND(([TOTAL ACTIVE PIXELS] *
512 * [IDEAL DUTY CYCLE] /
513 * (100-[IDEAL DUTY CYCLE]) /
514 * (2*[CELL GRAN RND])), 0))
515 * * (2*[CELL GRAN RND])
517 * Of course, we adjust to make this rounding work in integer math.
520 h_blank
= DIVIDE(DIVIDE(total_active_pixels
* ideal_duty_cycle
,
521 (256000 * 100ULL) - ideal_duty_cycle
),
522 2 * CELL_GRAN
) * (2 * CELL_GRAN
);
524 print_value(19, "[H BLANK (PIXELS)]", h_blank
);
527 /* 20. Find total number of pixels:
529 * [TOTAL PIXELS] = [TOTAL ACTIVE PIXELS] + [H BLANK (PIXELS)]
532 total_pixels
= total_active_pixels
+ h_blank
;
534 print_value(20, "[TOTAL PIXELS]", total_pixels
);
537 /* 21. Find pixel clock frequency:
539 * [PIXEL FREQ] = [TOTAL PIXELS] / [H PERIOD]
541 * We calculate this in Hz rather than MHz, to get a value that
542 * is usable with integer math. Recall that the [H PERIOD] is in
546 pixel_freq
= DIVIDE(total_pixels
* 1000000, DIVIDE(h_period
, 1000));
548 print_value(21, "[PIXEL FREQ]", pixel_freq
);
551 /* 22. Find horizontal frequency:
553 * [H FREQ] = 1000 / [H PERIOD]
555 * I've ifdef'd this out, because we don't need it for any of
557 * We calculate this in Hz rather than kHz, to avoid rounding
558 * errors. Recall that the [H PERIOD] is in usec.
562 h_freq
= 1000000000 / h_period
;
564 print_value(22, "[H FREQ]", h_freq
);
569 /* Stage 1 computations are now complete; I should really pass
570 the results to another function and do the Stage 2
571 computations, but I only need a few more values so I'll just
572 append the computations here for now */
576 /* 17. Find the number of pixels in the horizontal sync period:
578 * [H SYNC (PIXELS)] =(ROUND(([H SYNC%] / 100 * [TOTAL PIXELS] /
579 * [CELL GRAN RND]),0))*[CELL GRAN RND]
581 * Rewriting for integer math:
583 * [H SYNC (PIXELS)]=(ROUND((H SYNC%] * [TOTAL PIXELS] / 100 /
584 * [CELL GRAN RND),0))*[CELL GRAN RND]
587 h_sync
= DIVIDE(((params
->hsync_pct
* total_pixels
) / 100), CELL_GRAN
) *
590 print_value(17, "[H SYNC (PIXELS)]", h_sync
);
593 /* 18. Find the number of pixels in the horizontal front porch period:
595 * [H FRONT PORCH (PIXELS)] = ([H BLANK (PIXELS)]/2)-[H SYNC (PIXELS)]
597 * Note that h_blank is always an even number of characters (i.e.
598 * h_blank % (CELL_GRAN * 2) == 0)
601 h_front_porch
= (h_blank
/ 2) - h_sync
;
603 print_value(18, "[H FRONT PORCH (PIXELS)]", h_front_porch
);
606 /* 36. Find the number of lines in the odd front porch period:
608 * [V ODD FRONT PORCH(LINES)]=([MIN PORCH RND]+[INTERLACE])
610 * Adjusting for the fact that the interlace is scaled:
612 * [V ODD FRONT PORCH(LINES)]=(([MIN PORCH RND] * 2) + [2*INTERLACE]) / 2
615 v_odd_front_porch_lines
= ((2 * params
->min_porch
) + interlace
) / 2;
617 print_value(36, "[V ODD FRONT PORCH(LINES)]", v_odd_front_porch_lines
);
620 /* finally, pack the results in the mode struct */
622 vmp
->hsync_start
= h_pixels
+ h_front_porch
;
623 vmp
->hsync_end
= vmp
->hsync_start
+ h_sync
;
624 vmp
->htotal
= total_pixels
;
625 vmp
->hdisplay
= h_pixels
;
627 vmp
->vsync_start
= v_lines
+ v_odd_front_porch_lines
;
628 vmp
->vsync_end
= vmp
->vsync_start
+ params
->vsync_rqd
;
629 vmp
->vtotal
= total_v_lines
;
630 vmp
->vdisplay
= v_lines
;
632 vmp
->dot_clock
= pixel_freq
;
637 vesagtf_mode(unsigned x
, unsigned y
, unsigned refresh
, struct videomode
*vmp
)
639 struct vesagtf_params params
;
641 params
.margin_ppt
= VESAGTF_MARGIN_PPT
;
642 params
.min_porch
= VESAGTF_MIN_PORCH
;
643 params
.vsync_rqd
= VESAGTF_VSYNC_RQD
;
644 params
.hsync_pct
= VESAGTF_HSYNC_PCT
;
645 params
.min_vsbp
= VESAGTF_MIN_VSBP
;
646 params
.M
= VESAGTF_M
;
647 params
.C
= VESAGTF_C
;
648 params
.K
= VESAGTF_K
;
649 params
.J
= VESAGTF_J
;
651 vesagtf_mode_params(x
, y
, refresh
, ¶ms
, 0, vmp
);
655 * The tidbit here is so that you can compile this file as a
656 * standalone user program to generate X11 modelines using VESA GTF.
657 * This also allows for testing of the code itself, without
658 * necessitating a full kernel recompile.
661 /* print_xf86_mode() - print the XFree86 modeline, given mode timings. */
663 #if !defined(__minix)
666 print_xf86_mode (struct videomode
*vmp
)
670 hf
= 1000.0 * vmp
->dot_clock
/ vmp
->htotal
;
671 vf
= 1.0 * hf
/ vmp
->vtotal
;
674 printf(" # %dx%d @ %.2f Hz (GTF) hsync: %.2f kHz; pclk: %.2f MHz\n",
675 vmp
->hdisplay
, vmp
->vdisplay
, vf
, hf
, vmp
->dot_clock
/ 1000.0);
677 printf(" Modeline \"%dx%d_%.2f\" %.2f"
680 " -HSync +Vsync\n\n",
681 vmp
->hdisplay
, vmp
->vdisplay
, vf
, (vmp
->dot_clock
/ 1000.0),
682 vmp
->hdisplay
, vmp
->hsync_start
, vmp
->hsync_end
, vmp
->htotal
,
683 vmp
->vdisplay
, vmp
->vsync_start
, vmp
->vsync_end
, vmp
->vtotal
);
687 main (int argc
, char *argv
[])
692 printf("usage: %s x y refresh\n", argv
[0]);
696 vesagtf_mode(atoi(argv
[1]), atoi(argv
[2]), atoi(argv
[3]), &m
);
704 #endif /* !defined(__minix) */