graphics/vesa/patch.cpp

26 vbe_patch_intel_bios(bios_state* state, display_mode& mode)
30 	timing.pixel_clock = mode.timing.pixel_clock / 10;
32 	timing.h_active = mode.timing.h_display & 0xFF;
33 	timing.h_active_high = (mode.timing.h_display >> 8) & 0xF;
35 	uint16 h_blank = mode.timing.h_total - mode.timing.h_display;
39 	timing.v_active = mode.timing.v_display & 0xFF;
40 	timing.v_active_high = (mode.timing.v_display >> 8) & 0xF;
42 	uint16 v_blank = mode.timing.v_total - mode.timing.v_display;
46 	uint16 h_sync_off = mode.timing.h_sync_start - mode.timing.h_display;
50 	uint16 h_sync_width = mode.timing.h_sync_end - mode.timing.h_sync_start;
54 	uint16 v_sync_off = mode.timing.v_sync_start - mode.timing.v_display;
58 	uint16 v_sync_width = mode.timing.v_sync_end - mode.timing.v_sync_start;
77 		// all occurences of it in the BIOS with our custom mode.
95 	dprintf(DEVICE_NAME ": patched custom mode in %d locations\n", replacementCount);
97 	// Did we manage to find a mode descriptor to replace?
105 vbe_patch_nvidia_bios(bios_state* state, display_mode& mode)
184 		if (allowedModes[i].width == mode.timing.h_display
185 			&& allowedModes[i].height == mode.timing.v_display) {
255 vbe_patch_atom1_bios(vesa_info& info, bios_state* state, display_mode& mode)
262 	dprintf(DEVICE_NAME ": patching ATOM mode timing (overwriting mode %dx%d)\n",
265 	timing->usCRTC_H_Total = mode.timing.h_total;
266 	timing->usCRTC_H_Disp = mode.timing.h_display;
267 	timing->usCRTC_H_SyncStart = mode.timing.h_sync_start;
268 	timing->usCRTC_H_SyncWidth = mode.timing.h_sync_end - mode.timing.h_sync_start;
270 	timing->usCRTC_V_Total = mode.timing.v_total;
271 	timing->usCRTC_V_Disp = mode.timing.v_display;
272 	timing->usCRTC_V_SyncStart = mode.timing.v_sync_start;
273 	timing->usCRTC_V_SyncWidth = mode.timing.v_sync_end - mode.timing.v_sync_start;
275 	timing->usPixelClock = mode.timing.pixel_clock / 10;
282 vbe_patch_atom2_bios(vesa_info& info, bios_state* state, display_mode& mode)
289 	dprintf(DEVICE_NAME ": patching ATOM DTD format (overwriting mode %dx%d)\n",
292 	timing->usHBlanking_Time = mode.timing.h_total - mode.timing.h_display;
293 	timing->usHActive = mode.timing.h_display;
294 	timing->usHSyncOffset = mode.timing.h_sync_start;
295 	timing->usHSyncWidth = mode.timing.h_sync_end - mode.timing.h_sync_start;
297 	timing->usVBlanking_Time = mode.timing.v_total - mode.timing.v_display;
298 	timing->usVActive = mode.timing.v_display;
299 	timing->usVSyncOffset = mode.timing.v_sync_start;
300 	timing->usVSyncWidth = mode.timing.v_sync_end - mode.timing.v_sync_start;
302 	timing->usPixClk = mode.timing.pixel_clock / 10;
329 		// TODO check if we can find the mode table
351 		// TODO check if we can find the mode table
359 /*! Set a custom display mode by live patching the VESA BIOS to insert it in the modeline table.
361  * This is only supported for some video cards, where the format of the mode lines is known.
364 vesa_set_custom_display_mode(vesa_info& info, display_mode& mode)
378 	// Patch bios to inject custom video mode
381 			status = vbe_patch_intel_bios(state, mode);
383 			// mode 0x118 which is the standard VBE2 mode for 1024x768 at 32 bits per pixel, and
387 			status = vbe_patch_nvidia_bios(state, mode);
390 			status = vbe_patch_atom1_bios(info, state, mode);
393 			status = vbe_patch_atom2_bios(info, state, mode);
403 	// The patching modified some mode, but we don't know which one. So we need to rescan the mode
407 		status = vbe_get_mode_info(state, info.modes[i].mode, &modeInfo);
409 			// Sometimes the patching prevents us from getting the mode info. The modesetting
410 			// still works, so we can detect the "broken" mode this way and then activate it.
411 			dprintf(DEVICE_NAME ": vesa_set_custom_display_mode(): cannot get mode info for %x\n",
412 				info.modes[i].mode);
413 			brokenModeIndex = info.modes[i].mode;
417 		if (modeInfo.width == mode.timing.h_display && modeInfo.height == mode.timing.v_display
418 			&& get_color_space_for_depth(info.modes[i].bits_per_pixel) == mode.space) {
419 			modeIndex = info.modes[i].mode;
428 		dprintf(DEVICE_NAME ": custom mode resolution %dx%d succesfully patched at index %"
431 		dprintf(DEVICE_NAME ": video mode patching failed!\n");
435 	// Set mode
438 		dprintf(DEVICE_NAME ": vesa_set_custom_display_mode(): cannot set mode\n");