85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <drivers/gop.h>
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#include <drivers/edid.h>
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#include <mm/pmm.h>
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#include <lib/misc.h>
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#include <lib/libc.h>
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#include <lib/print.h>
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#if defined (BIOS)
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#include <lib/real.h>
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struct edid_info_struct *get_edid_info(void) {
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static struct edid_info_struct *buf = NULL;
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if (buf == NULL)
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buf = conv_mem_alloc(sizeof(struct edid_info_struct));
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struct rm_regs r = {0};
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r.eax = 0x4f15;
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r.ebx = 0x0001;
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r.edi = (uint32_t)rm_off(buf);
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r.ds = (uint32_t)rm_seg(buf);
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r.es = r.ds;
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rm_int(0x10, &r, &r);
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if ((r.eax & 0x00ff) != 0x4f)
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goto fail;
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if ((r.eax & 0xff00) != 0)
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goto fail;
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for (size_t i = 0; i < sizeof(struct edid_info_struct); i++)
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if (((uint8_t *)buf)[i] != 0)
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goto success;
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fail:
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printv("edid: Could not fetch EDID data.\n");
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return NULL;
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success:
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printv("edid: Success.\n");
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return buf;
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}
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#endif
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#if defined (UEFI)
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#include <efi.h>
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struct edid_info_struct *get_edid_info(EFI_HANDLE gop_handle) {
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struct edid_info_struct *buf = ext_mem_alloc(sizeof(struct edid_info_struct));
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EFI_STATUS status;
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EFI_EDID_ACTIVE_PROTOCOL *edid = NULL;
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EFI_GUID edid_guid = EFI_EDID_ACTIVE_PROTOCOL_GUID;
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status = gBS->HandleProtocol(gop_handle, &edid_guid, (void **)&edid);
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if (status)
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goto fail;
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if (edid->SizeOfEdid < sizeof(struct edid_info_struct))
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goto fail;
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memcpy(buf, edid->Edid, sizeof(struct edid_info_struct));
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for (size_t i = 0; i < sizeof(struct edid_info_struct); i++)
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if (((uint8_t *)buf)[i] != 0)
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goto success;
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fail:
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printv("edid: Could not fetch EDID data.\n");
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return NULL;
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success:
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printv("edid: Success.\n");
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return buf;
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}
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#endif
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