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rulimine/common/drivers/gop.c

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#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
static bool mode_to_fb_info(struct fb_info *ret, EFI_GRAPHICS_OUTPUT_PROTOCOL *gop, size_t mode) {
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:
return false;
}
ret->memory_model = 0x06;
ret->framebuffer_pitch = mode_info->PixelsPerScanLine * (ret->framebuffer_bpp / 8);
ret->framebuffer_width = mode_info->HorizontalResolution;
ret->framebuffer_height = mode_info->VerticalResolution;
return true;
}
bool gop_force_16 = false;
static bool try_mode(struct fb_info *ret, EFI_GRAPHICS_OUTPUT_PROTOCOL *gop,
size_t mode, uint64_t width, uint64_t height, int bpp,
struct fb_info *fbs, size_t fbs_count) {
EFI_STATUS status;
if (!mode_to_fb_info(ret, gop, mode)) {
return false;
}
if (width != 0 && height != 0 && bpp != 0) {
if (ret->framebuffer_width != width
|| ret->framebuffer_height != height
|| ret->framebuffer_bpp != bpp) {
return false;
}
}
if (gop_force_16) {
if (ret->framebuffer_width >= 65536
|| ret->framebuffer_height >= 65536
|| ret->framebuffer_pitch >= 65536) {
return false;
}
}
for (size_t i = 0; i < fbs_count; i++) {
if (gop->Mode->FrameBufferBase == fbs[i].framebuffer_addr) {
return false;
}
}
printv("gop: Found matching mode %x, attempting to set...\n", mode);
if (mode == gop->Mode->Mode) {
printv("gop: Mode was already set, perfect!\n");
} else {
status = gop->SetMode(gop, mode);
if (status) {
printv("gop: Failed to set video mode %x, moving on...\n", mode);
return false;
}
}
ret->framebuffer_addr = gop->Mode->FrameBufferBase;
fb_clear(ret);
return true;
}
static struct fb_info *get_mode_list(size_t *count, EFI_GRAPHICS_OUTPUT_PROTOCOL *gop) {
UINTN modes_count = gop->Mode->MaxMode;
struct fb_info *ret = ext_mem_alloc(modes_count * sizeof(struct fb_info));
size_t actual_count = 0;
for (size_t i = 0; i < modes_count; i++) {
if (mode_to_fb_info(&ret[actual_count], gop, i)) {
actual_count++;
}
}
struct fb_info *tmp = ext_mem_alloc(actual_count * sizeof(struct fb_info));
memcpy(tmp, ret, actual_count * sizeof(struct fb_info));
pmm_free(ret, modes_count * sizeof(struct fb_info));
ret = tmp;
*count = modes_count;
return ret;
}
void init_gop(struct fb_info **ret, size_t *_fbs_count,
uint64_t target_width, uint64_t target_height, uint16_t target_bpp) {
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) {
*_fbs_count = 0;
return;
}
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);
*_fbs_count = 0;
return;
}
size_t handles_count = handles_size / sizeof(EFI_HANDLE);
*ret = ext_mem_alloc(handles_count * sizeof(struct fb_info));
const 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 }
};
size_t fbs_count = 0;
for (size_t i = 0; i < handles_count; i++) {
struct fb_info *fb = &(*ret)[fbs_count];
uint64_t _target_width = target_width;
uint64_t _target_height = target_height;
uint64_t _target_bpp = target_bpp;
EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
status = gBS->HandleProtocol(handles[i], &gop_guid, (void **)&gop);
if (status != EFI_SUCCESS) {
continue;
}
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) {
continue;
}
status = gop->QueryMode(gop, gop->Mode == NULL ? 0 : gop->Mode->Mode,
&mode_info_size, &mode_info);
}
if (status) {
continue;
}
int preset_mode = gop->Mode->Mode;
fb->edid = get_edid_info(handles[i]);
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 j = 0; j < modes_count; j++) {
if (try_mode(fb, gop, j, _target_width, _target_height, _target_bpp, *ret, fbs_count)) {
goto success;
}
}
fallback:
if (current_fallback == 0) {
current_fallback++;
if (fb->edid != NULL) {
uint64_t edid_width = (uint64_t)fb->edid->det_timing_desc1[2];
edid_width += ((uint64_t)fb->edid->det_timing_desc1[4] & 0xf0) << 4;
uint64_t edid_height = (uint64_t)fb->edid->det_timing_desc1[5];
edid_height += ((uint64_t)fb->edid->det_timing_desc1[7] & 0xf0) << 4;
if (edid_width >= mode_info->HorizontalResolution
&& edid_height >= 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(fb, gop, preset_mode, 0, 0, 0, *ret, fbs_count)) {
goto success;
}
}
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;
}
continue;
success:
fb->mode_list = get_mode_list(&fb->mode_count, gop);
fbs_count++;
}
pmm_free(handles, handles_size);
gop_force_16 = false;
*_fbs_count = fbs_count;
}
#endif
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