rulimine/common/drivers/gop.c

279 lines
8.6 KiB
C

#if defined (UEFI)
#include <stdint.h>
#include <stddef.h>
#include <efi.h>
#include <lib/misc.h>
#include <lib/term.h>
#include <drivers/gop.h>
#include <drivers/edid.h>
#include <lib/print.h>
#include <mm/pmm.h>
static uint16_t linear_masks_to_bpp(uint32_t red_mask, uint32_t green_mask,
uint32_t blue_mask, uint32_t alpha_mask) {
uint32_t compound_mask = red_mask | green_mask | blue_mask | alpha_mask;
uint16_t ret = 32;
while ((compound_mask & (1 << 31)) == 0) {
ret--;
compound_mask <<= 1;
}
return ret;
}
static void linear_mask_to_mask_shift(
uint8_t *mask, uint8_t *shift, uint32_t linear_mask) {
*shift = 0;
while ((linear_mask & 1) == 0) {
(*shift)++;
linear_mask >>= 1;
}
*mask = 0;
while ((linear_mask & 1) == 1) {
(*mask)++;
linear_mask >>= 1;
}
}
// Most of this code taken from https://wiki.osdev.org/GOP
bool gop_force_16 = false;
static bool try_mode(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop,
struct fb_info *ret, size_t mode, uint64_t width, uint64_t height, int bpp) {
EFI_STATUS status;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
UINTN mode_info_size;
status = gop->QueryMode(gop, mode, &mode_info_size, &mode_info);
if (status)
return false;
switch (mode_info->PixelFormat) {
case PixelBlueGreenRedReserved8BitPerColor:
ret->framebuffer_bpp = 32;
ret->red_mask_size = 8;
ret->red_mask_shift = 16;
ret->green_mask_size = 8;
ret->green_mask_shift = 8;
ret->blue_mask_size = 8;
ret->blue_mask_shift = 0;
break;
case PixelRedGreenBlueReserved8BitPerColor:
ret->framebuffer_bpp = 32;
ret->red_mask_size = 8;
ret->red_mask_shift = 0;
ret->green_mask_size = 8;
ret->green_mask_shift = 8;
ret->blue_mask_size = 8;
ret->blue_mask_shift = 16;
break;
case PixelBitMask:
ret->framebuffer_bpp = linear_masks_to_bpp(
mode_info->PixelInformation.RedMask,
mode_info->PixelInformation.GreenMask,
mode_info->PixelInformation.BlueMask,
mode_info->PixelInformation.ReservedMask);
linear_mask_to_mask_shift(&ret->red_mask_size,
&ret->red_mask_shift,
mode_info->PixelInformation.RedMask);
linear_mask_to_mask_shift(&ret->green_mask_size,
&ret->green_mask_shift,
mode_info->PixelInformation.GreenMask);
linear_mask_to_mask_shift(&ret->blue_mask_size,
&ret->blue_mask_shift,
mode_info->PixelInformation.BlueMask);
break;
default:
panic(false, "gop: Invalid PixelFormat");
}
if (width != 0 && height != 0 && bpp != 0) {
if ((uint64_t)mode_info->HorizontalResolution != width
|| (uint64_t)mode_info->VerticalResolution != height
|| (int)ret->framebuffer_bpp != bpp)
return false;
}
if (gop_force_16) {
if (mode_info->HorizontalResolution >= 65536
|| mode_info->VerticalResolution >= 65536
|| mode_info->PixelsPerScanLine * (ret->framebuffer_bpp / 8) >= 65536) {
return false;
}
}
printv("gop: Found matching mode %x, attempting to set...\n", mode);
if ((int)mode == current_video_mode) {
printv("gop: Mode was already set, perfect!\n");
} else {
status = gop->SetMode(gop, mode);
if (status) {
current_video_mode = -1;
printv("gop: Failed to set video mode %x, moving on...\n", mode);
return false;
}
}
current_video_mode = mode;
ret->memory_model = 0x06;
ret->framebuffer_addr = gop->Mode->FrameBufferBase;
ret->framebuffer_pitch = gop->Mode->Info->PixelsPerScanLine * (ret->framebuffer_bpp / 8);
ret->framebuffer_width = gop->Mode->Info->HorizontalResolution;
ret->framebuffer_height = gop->Mode->Info->VerticalResolution;
fb_clear(ret);
return true;
}
#define INVALID_PRESET_MODE 0xffffffff
static no_unwind size_t preset_mode = INVALID_PRESET_MODE;
static no_unwind EFI_GRAPHICS_OUTPUT_MODE_INFORMATION preset_mode_info;
bool init_gop(struct fb_info *ret,
uint64_t target_width, uint64_t target_height, uint16_t target_bpp) {
ret->default_res = false;
EFI_STATUS status;
EFI_HANDLE tmp_handles[1];
EFI_HANDLE *handles = tmp_handles;
UINTN handles_size = sizeof(EFI_HANDLE);
EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
status = gBS->LocateHandle(ByProtocol, &gop_guid, NULL, &handles_size, handles);
if (status != EFI_SUCCESS && status != EFI_BUFFER_TOO_SMALL) {
return false;
}
handles = ext_mem_alloc(handles_size);
status = gBS->LocateHandle(ByProtocol, &gop_guid, NULL, &handles_size, handles);
if (status != EFI_SUCCESS) {
pmm_free(handles, handles_size);
return false;
}
EFI_HANDLE gop_handle = handles[0];
pmm_free(handles, handles_size);
EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
status = gBS->HandleProtocol(gop_handle, &gop_guid, (void **)&gop);
if (status != EFI_SUCCESS) {
return false;
}
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
UINTN mode_info_size;
status = gop->QueryMode(gop, gop->Mode == NULL ? 0 : gop->Mode->Mode,
&mode_info_size, &mode_info);
if (status == EFI_NOT_STARTED) {
status = gop->SetMode(gop, 0);
if (status) {
panic(false, "gop: Initialisation failed");
}
status = gop->QueryMode(gop, gop->Mode == NULL ? 0 : gop->Mode->Mode,
&mode_info_size, &mode_info);
}
if (status) {
panic(false, "gop: Initialisation failed");
}
if (preset_mode == INVALID_PRESET_MODE) {
preset_mode = gop->Mode->Mode;
memcpy(&preset_mode_info, mode_info, mode_info_size);
current_video_mode = preset_mode;
}
struct resolution fallback_resolutions[] = {
{ 0, 0, 0 }, // Overridden by EDID
{ 0, 0, 0 }, // Overridden by preset
{ 1024, 768, 32 },
{ 800, 600, 32 },
{ 640, 480, 32 },
{ 1024, 768, 24 },
{ 800, 600, 24 },
{ 640, 480, 24 },
{ 1024, 768, 16 },
{ 800, 600, 16 },
{ 640, 480, 16 }
};
UINTN modes_count = gop->Mode->MaxMode;
size_t current_fallback = 0;
if (!target_width || !target_height || !target_bpp) {
goto fallback;
} else {
printv("gop: Requested resolution of %ux%ux%u\n",
target_width, target_height, target_bpp);
}
retry:
for (size_t i = 0; i < modes_count; i++) {
if (try_mode(gop, ret, i, target_width, target_height, target_bpp)) {
gop_force_16 = false;
return true;
}
}
fallback:
ret->default_res = true;
if (current_fallback == 0) {
current_fallback++;
struct edid_info_struct *edid_info = get_edid_info();
if (edid_info != NULL) {
uint64_t edid_width = (uint64_t)edid_info->det_timing_desc1[2];
edid_width += ((uint64_t)edid_info->det_timing_desc1[4] & 0xf0) << 4;
uint64_t edid_height = (uint64_t)edid_info->det_timing_desc1[5];
edid_height += ((uint64_t)edid_info->det_timing_desc1[7] & 0xf0) << 4;
if (edid_width >= preset_mode_info.HorizontalResolution
&& edid_height >= preset_mode_info.VerticalResolution) {
target_width = edid_width;
target_height = edid_height;
target_bpp = 32;
goto retry;
}
}
}
if (current_fallback == 1) {
current_fallback++;
if (try_mode(gop, ret, preset_mode, 0, 0, 0)) {
gop_force_16 = false;
return true;
}
}
if (current_fallback < SIZEOF_ARRAY(fallback_resolutions)) {
current_fallback++;
target_width = fallback_resolutions[current_fallback].width;
target_height = fallback_resolutions[current_fallback].height;
target_bpp = fallback_resolutions[current_fallback].bpp;
goto retry;
}
gop_force_16 = false;
return false;
}
#endif