EFI_FFS_INTEGRITY_CHECK Union Reference


Data Fields

struct {
   UINT8   Header
   UINT8   File
Checksum
UINT16 Checksum16

Detailed Description

Used to verify the integrity of the file.

Field Documentation

This is the full 16 bits of the IntegrityCheck field.

If the FFS_ATTRIB_CHECKSUM (see definition below) bit of the Attributes field is set to one, the IntegrityCheck.Checksum.File field is an 8-bit checksum of the file data. If the FFS_ATTRIB_CHECKSUM bit of the Attributes field is cleared to zero, the IntegrityCheck.Checksum.File field must be initialized with a value of 0xAA. The IntegrityCheck.Checksum.File field is valid any time the EFI_FILE_DATA_VALID bit is set in the State field.

The IntegrityCheck.Checksum.Header field is an 8-bit checksum of the file header. The State and IntegrityCheck.Checksum.File fields are assumed to be zero and the checksum is calculated such that the entire header sums to zero.


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