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uefi_utils.h (2018B)

      1 // #include "uefi.h"
      2 
      3 extern EFI_SYSTEM_TABLE *SystemTable;
      4 
      5 // Printh converts the integer into a string of hex representation.
      6 // It returns the second argument.
      7 // The second argument should have length of 19 ("0x" + "0123456789abcdef" + "\0").
      8 CHAR16 *sprinth(UINT64, CHAR16[19]);
      9 
     10 // Wstr2str converts UTF16-encoded string s16 to string.
     11 // It ignores the high byte.
     12 // caller must ensure that s has enough space.
     13 // It returns s.
     14 char *wstr2str(CHAR16 *s16, char *s8);
     15 
     16 // Efi_printf prints formatted string to ConOut.
     17 // Can't format a string longer than 1024 CHAR16s.
     18 // It returns number of CHAR16s written excluding the final NULL.
     19 int efi_printf(char *fmt, ...);
     20 
     21 // Open_gop opens the graphics output protocol.
     22 EFI_STATUS open_gop(EFI_HANDLE, EFI_GRAPHICS_OUTPUT_PROTOCOL **);
     23 
     24 // Open_root opens the root directory of the efi image.
     25 EFI_STATUS open_root(EFI_HANDLE, EFI_FILE_PROTOCOL **);
     26 
     27 // ELF header.
     28 typedef struct {
     29 	unsigned char ident[16];
     30 	UINT16        type;
     31 	UINT16        machine;
     32 	UINT32        version;
     33 	UINTN         entry;
     34 	UINTN         phoff;
     35 	UINTN         shoff;
     36 	UINT32        flags;
     37 	UINT16        ehsize; // ELF header's size.
     38 	UINT16        phentsize;
     39 	UINT16        phnum;
     40 	UINT16        shentsize;
     41 	UINT16        shnum;
     42 	UINT16        shstrndx;
     43 } ElfHdr;
     44 
     45 typedef struct {
     46 	UINT32 type;
     47 	UINT32 flags;
     48 	UINTN  offset;
     49 	UINTN  vaddr;
     50 	UINTN  paddr;
     51 	UINT64 filesz;
     52 	UINT64 memsz;
     53 	UINT64 align;
     54 } Phdr;
     55 
     56 #define PT_LOAD 1
     57 
     58 // Read_ehdr reads elf header and populates ehdr.
     59 // It modifies elf's offset.
     60 EFI_STATUS read_ehdr(EFI_FILE_PROTOCOL *elf, ElfHdr *ehdr);
     61 
     62 // Read_phdr reads elf's program headers and populates phdr.
     63 // It uses ehdr to read phdr.
     64 // It modifies elf's offset.
     65 // Caller should allocate enough space in phdr.
     66 EFI_STATUS read_phdr(EFI_FILE_PROTOCOL *elf, ElfHdr *ehdr, Phdr phdr[]);
     67 
     68 // Load_elf copies loadable segments of elf to the memory specified by the
     69 // vaddr field of each Phdr.
     70 EFI_STATUS load_elf(EFI_FILE_PROTOCOL *elf, ElfHdr *ehdr, Phdr phdr[]);