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efigop.c revision 1.2 
      1 /* $NetBSD: efigop.c,v 1.2 2021/10/06 10:13:19 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2021 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "efiboot.h"
     30 
     31 static EFI_GRAPHICS_OUTPUT_PROTOCOL *gop = NULL;
     32 
     33 void
     34 efi_gop_probe(void)
     35 {
     36 	EFI_HANDLE *gop_handle;
     37 	UINTN ngop_handle;
     38 	EFI_STATUS status;
     39 
     40 	status = LibLocateHandle(ByProtocol, &GraphicsOutputProtocol, NULL,
     41 	    &ngop_handle, &gop_handle);
     42 	if (EFI_ERROR(status) || ngop_handle == 0) {
     43 		return;
     44 	}
     45 
     46 	for (size_t n = 0; n < ngop_handle; n++) {
     47 		status = uefi_call_wrapper(BS->HandleProtocol, 3,
     48 		    gop_handle[n], &GraphicsOutputProtocol, (void **)&gop);
     49 		if (EFI_ERROR(status) || gop->Mode == NULL) {
     50 			gop = NULL;
     51 			continue;
     52 		} else {
     53 			break;
     54 		}
     55 	}
     56 }
     57 
     58 static uint32_t
     59 efi_gop_bpp(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info)
     60 {
     61 	if (info->PixelFormat == PixelRedGreenBlueReserved8BitPerColor ||
     62 	    info->PixelFormat == PixelBlueGreenRedReserved8BitPerColor) {
     63 		return 24;
     64 	}
     65 
     66 	return popcount32(info->PixelInformation.RedMask) +
     67 	    popcount32(info->PixelInformation.GreenMask) +
     68 	    popcount32(info->PixelInformation.BlueMask);
     69 }
     70 
     71 static void
     72 efi_gop_printmode(UINT32 mode, EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info)
     73 {
     74 	char buf[sizeof("NNNNN: HHHHHxVVVVV BB")];
     75 
     76 	snprintf(buf, sizeof(buf), "%-5u: %ux%u %u", mode,
     77 	    info->HorizontalResolution, info->VerticalResolution,
     78 	    efi_gop_bpp(info));
     79 
     80 	printf("%-21s", buf);
     81 }
     82 
     83 void
     84 efi_gop_show(void)
     85 {
     86 	if (gop == NULL) {
     87 		return;
     88 	}
     89 
     90 	printf("GOP: ");
     91 	efi_gop_printmode(gop->Mode->Mode, gop->Mode->Info);
     92 	printf("\n");
     93 }
     94 
     95 void
     96 efi_gop_dump(void)
     97 {
     98 	EFI_STATUS status;
     99 	EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info;
    100 	UINTN size;
    101 
    102 	if (gop == NULL) {
    103 		return;
    104 	}
    105 
    106 	for (UINT32 mode = 0; mode < gop->Mode->MaxMode; mode++) {
    107 		status = uefi_call_wrapper(gop->QueryMode, 4, gop, mode,
    108 		    &size, &info);
    109 		if (EFI_ERROR(status)) {
    110 			continue;
    111 		}
    112 		if (mode == gop->Mode->Mode) {
    113 			printf(" -> ");
    114 		} else {
    115 			printf("    ");
    116 		}
    117 		efi_gop_printmode(mode, info);
    118 		if (mode != gop->Mode->MaxMode - 1 &&
    119 		    mode % 3 == 2) {
    120 			printf("\n");
    121 		}
    122 	}
    123 	printf("\n");
    124 }
    125 
    126 void
    127 efi_gop_setmode(UINT32 mode)
    128 {
    129 	EFI_STATUS status;
    130 
    131 	if (gop == NULL) {
    132 		return;
    133 	}
    134 
    135 	status = uefi_call_wrapper(gop->SetMode, 2, gop, mode);
    136 	if (EFI_ERROR(status)) {
    137 		printf("Failed to set video mode: %ld\n", (long)status);
    138 	}
    139 }
    140