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15-30 Vol. 3
MACHINE-CHECK ARCHITECTURE
also write a 16-bit model-specific error code in the IA32_MCi_STATUS
register depending on the implementation of the machine-check architec
-
ture of the processor.
The MCA error codes are architecturally defined for Intel 64 and IA-32
processors. To determine the cause of a machine-check exception, the
machine-check exception handler must read the VAL flag for each
IA32_MCi_STATUS register. If the flag is set, the machine check-exception
handler must then read the MCA error code field of the register. It is the
encoding of the MCA error code field [15:0] that determines the type of error
being reported and not the register bank reporting it.
There are two types of MCA error codes: simple error codes and compound
error codes.
15.9.1 Simple Error Codes
Table 15-8 shows the simple error codes. These unique codes indicate global
error information.
Table 15-8. IA32_MCi_Status [15:0] Simple Error Code Encoding
Error Code Binary Encoding Meaning
No Error 0000 0000 0000 0000 No error has been reported to this bank of
error-reporting registers.
Unclassified 0000 0000 0000 0001 This error has not been classified into the
MCA error classes.
Microcode ROM Parity
Error
0000 0000 0000 0010 Parity error in internal microcode ROM
External Error 0000 0000 0000 0011 The BINIT# from another processor caused
this processor to enter machine check.
1
FRC Error 0000 0000 0000 0100 FRC (functional redundancy check)
master/slave error
Internal Parity Error 0000 0000 0000 0101 Internal parity error.
Internal Timer Error 0000 0100 0000 0000 Internal timer error.
Internal Unclassified 0000 01xx xxxx xxxx Internal unclassified errors.
2
NOTES:
1. BINIT# assertion will cause a machine check exception if the processor (or any processor on the
same external bus) has BINIT# observation enabled during power-on configuration (hardware
strapping) and if machine check exceptions are enabled (by setting CR4.MCE = 1).
2. At least one X must equal one. Internal unclassified errors have not been classified.