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李通洲
32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
#include "bootmgr.h"
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#include "common/io.h"
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#include "efi_helper.h"
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#include <stdalign.h>
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#define FF_EFIVARS_PATH_PREFIX "/sys/firmware/efi/efivars/"
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const char* ffDetectBootmgr(FFBootmgrResult* result)
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{
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alignas(uint16_t) uint8_t buffer[2048];
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if (ffReadFileData(FF_EFIVARS_PATH_PREFIX "BootCurrent-" FF_EFI_GLOBAL_GUID, sizeof(buffer), buffer) != 6)
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return "Failed to read efivar: BootCurrent";
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result->order = *(uint16_t *)&buffer[4];
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snprintf((char*) buffer, sizeof(buffer), FF_EFIVARS_PATH_PREFIX "Boot%04X-" FF_EFI_GLOBAL_GUID, result->order);
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ssize_t size = ffReadFileData((const char*) buffer, sizeof(buffer), buffer);
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if (size < 5 + (int) sizeof(FFEfiLoadOption) || size == (ssize_t) sizeof(buffer))
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return "Failed to read efivar: Boot####";
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ffEfiFillLoadOption((FFEfiLoadOption *)&buffer[4], result);
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if (ffReadFileData(FF_EFIVARS_PATH_PREFIX "SecureBoot-" FF_EFI_GLOBAL_GUID, sizeof(buffer), buffer) >= 5)
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result->secureBoot = buffer[4] == 1;
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return NULL;
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}
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