Hardware Error Codes

Selector Related Error Code

Bits 31-15: Reserved.
Bits 15-03: The index part of the selector involved.
Bit     02: The table indicator bit,
            if neither bit 01 nor bit 00 are 1.
Bit     01: IDT selector bit,
            if on, the selector is in the IDT.
Bit     00: External bit,
            if on, not caused by the program

Page Fault Error Code

Bits 31-04: Reserved.
Bit  03: RSV. A 1 bit was detected in a reserved
         bit of a page directory or page table entry.
Bit  02: U/S.
         0: The program was in supervisor mode.
         1: The program was in user mode.
Bit  01: W/R.
         0: The access was a read.
         1: The access was a write.
Bit  00: Level.
         0: The fault is because of a not-present page.
         1: The fault is because of page-level protection.