223 lines
7.0 KiB
C
223 lines
7.0 KiB
C
#if defined (uefi)
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#include <efi.h>
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#include <lib/blib.h>
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#include <lib/term.h>
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#include <drivers/gop.h>
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#include <drivers/edid.h>
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#include <lib/print.h>
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static uint16_t linear_masks_to_bpp(uint32_t red_mask, uint32_t green_mask,
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uint32_t blue_mask, uint32_t alpha_mask) {
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uint32_t compound_mask = red_mask | green_mask | blue_mask | alpha_mask;
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uint16_t ret = 32;
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while ((compound_mask & (1 << 31)) == 0) {
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ret--;
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compound_mask <<= 1;
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}
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return ret;
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}
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static void linear_mask_to_mask_shift(
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uint8_t *mask, uint8_t *shift, uint32_t linear_mask) {
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*shift = 0;
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while ((linear_mask & 1) == 0) {
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(*shift)++;
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linear_mask >>= 1;
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}
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*mask = 0;
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while ((linear_mask & 1) == 1) {
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(*mask)++;
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linear_mask >>= 1;
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}
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}
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// Most of this code taken from https://wiki.osdev.org/GOP
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static bool try_mode(struct fb_info *ret, size_t mode, int width, int height, int bpp) {
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EFI_STATUS status;
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EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
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EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
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uefi_call_wrapper(gBS->LocateProtocol, 3, &gop_guid, NULL, (void **)&gop);
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EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
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UINTN mode_info_size;
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status = uefi_call_wrapper(gop->QueryMode, 4,
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gop, mode, &mode_info_size, &mode_info);
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if (status)
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return false;
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switch (mode_info->PixelFormat) {
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case PixelBlueGreenRedReserved8BitPerColor:
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ret->framebuffer_bpp = 32;
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ret->red_mask_size = 8;
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ret->red_mask_shift = 16;
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ret->green_mask_size = 8;
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ret->green_mask_shift = 8;
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ret->blue_mask_size = 8;
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ret->blue_mask_shift = 0;
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break;
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case PixelRedGreenBlueReserved8BitPerColor:
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ret->framebuffer_bpp = 32;
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ret->red_mask_size = 8;
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ret->red_mask_shift = 0;
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ret->green_mask_size = 8;
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ret->green_mask_shift = 8;
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ret->blue_mask_size = 8;
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ret->blue_mask_shift = 16;
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break;
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case PixelBitMask:
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ret->framebuffer_bpp = linear_masks_to_bpp(
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mode_info->PixelInformation.RedMask,
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mode_info->PixelInformation.GreenMask,
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mode_info->PixelInformation.BlueMask,
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mode_info->PixelInformation.ReservedMask);
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linear_mask_to_mask_shift(&ret->red_mask_size,
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&ret->red_mask_shift,
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mode_info->PixelInformation.RedMask);
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linear_mask_to_mask_shift(&ret->green_mask_size,
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&ret->green_mask_shift,
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mode_info->PixelInformation.GreenMask);
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linear_mask_to_mask_shift(&ret->blue_mask_size,
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&ret->blue_mask_shift,
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mode_info->PixelInformation.BlueMask);
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break;
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default:
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panic("gop: Invalid PixelFormat");
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}
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if (width != 0 && height != 0 && bpp != 0) {
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if ((int)mode_info->HorizontalResolution != width
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|| (int)mode_info->VerticalResolution != height
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|| (int)ret->framebuffer_bpp != bpp)
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return false;
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}
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printv("gop: Found matching mode %x, attempting to set...\n", mode);
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if ((int)mode == current_video_mode) {
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printv("gop: Mode was already set, perfect!\n");
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} else {
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status = uefi_call_wrapper(gop->SetMode, 2, gop, mode);
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if (status) {
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current_video_mode = -2;
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printv("gop: Failed to set video mode %x, moving on...\n", mode);
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return false;
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}
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}
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current_video_mode = mode;
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ret->memory_model = 0x06;
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ret->framebuffer_addr = gop->Mode->FrameBufferBase;
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ret->framebuffer_pitch = gop->Mode->Info->PixelsPerScanLine * (ret->framebuffer_bpp / 8);
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ret->framebuffer_width = gop->Mode->Info->HorizontalResolution;
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ret->framebuffer_height = gop->Mode->Info->VerticalResolution;
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fb_clear(ret);
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return true;
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}
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#define INVALID_PRESET_MODE 0xfffffffff
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static size_t preset_mode = INVALID_PRESET_MODE;
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bool init_gop(struct fb_info *ret,
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uint16_t target_width, uint16_t target_height, uint16_t target_bpp) {
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ret->default_res = false;
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EFI_STATUS status;
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EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
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EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
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uefi_call_wrapper(gBS->LocateProtocol, 3, &gop_guid, NULL, (void **)&gop);
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EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
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UINTN mode_info_size;
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status = uefi_call_wrapper(gop->QueryMode, 4, gop,
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gop->Mode == NULL ? 0 : gop->Mode->Mode,
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&mode_info_size, &mode_info);
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if (status == EFI_NOT_STARTED) {
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status = uefi_call_wrapper(gop->SetMode, 2, gop, 0);
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}
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if (status) {
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panic("gop: Initialisation failed");
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}
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if (preset_mode == INVALID_PRESET_MODE)
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preset_mode = gop->Mode->Mode;
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struct resolution fallback_resolutions[] = {
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{ 0, 0, 0 }, // Overridden by preset mode
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{ 1024, 768, 32 },
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{ 800, 600, 32 },
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{ 640, 480, 32 }
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};
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UINTN modes_count = gop->Mode->MaxMode;
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size_t current_fallback = 0;
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if (!target_width || !target_height || !target_bpp) {
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ret->default_res = true;
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struct edid_info_struct *edid_info = get_edid_info();
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if (edid_info != NULL) {
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int edid_width = (int)edid_info->det_timing_desc1[2];
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edid_width += ((int)edid_info->det_timing_desc1[4] & 0xf0) << 4;
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int edid_height = (int)edid_info->det_timing_desc1[5];
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edid_height += ((int)edid_info->det_timing_desc1[7] & 0xf0) << 4;
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if (edid_width && edid_height) {
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target_width = edid_width;
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target_height = edid_height;
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target_bpp = 32;
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printv("gop: EDID detected screen resolution of %ux%u\n",
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target_width, target_height);
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goto retry;
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}
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}
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goto fallback;
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} else {
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printv("gop: Requested resolution of %ux%ux%u\n",
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target_width, target_height, target_bpp);
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}
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retry:
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for (size_t i = 0; i < modes_count; i++) {
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if (try_mode(ret, i, target_width, target_height, target_bpp))
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return true;
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}
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fallback:
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ret->default_res = true;
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if (current_fallback == 0) {
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if (try_mode(ret, preset_mode, 0, 0, 0))
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return true;
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current_fallback++;
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}
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if (current_fallback < SIZEOF_ARRAY(fallback_resolutions)) {
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target_width = fallback_resolutions[current_fallback].width;
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target_height = fallback_resolutions[current_fallback].height;
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target_bpp = fallback_resolutions[current_fallback].bpp;
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current_fallback++;
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goto retry;
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}
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return false;
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}
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#endif
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