!mca

The !mca extension displays the machine check architecture (MCA) registers.

!mca

Parameters

Address
(Itanium target only) Specifies the address of the MCA error record.

Flags
(Itanium target only) Specifies the level of output. Flags can be any combination of the following bits. The default value is 0xFF, which displays all sections present in the log.

Bit 0 (0x1)
Displays the processor section.

Bit 1 (0x2)
Displays the platform-specific section.

Bit 2 (0x4)
Displays the memory section.

Bit 3 (0x8)
Displays the PCI component section.

Bit 4 (0x10)
Displays the PCI bus section.

Bit 5 (0x20)
Displays the SystemEvent Log section.

Bit 6 (0x40)
Displays the platform host controller section.

Bit 7 (0x80)
Displays to include the platform bus section.

DLL

Kdexts.dll

This extension command can only be used with an x86-based target computer.

Remarks

On an x86 target, !mca displays the machine check registers supported by the active processor. It also displays basic CPU information (identical to that displayed by !cpuinfo). Here is an example of the output from this extension:

0: kd> !mca
MCE: Enabled, Cycle Address: 0x00000001699f7a00, Type: 0x0000000000000000

MCA: Enabled, Banks 5, Control Reg: Supported, Machine Check: None.
Bank  Error  Control Register     Status Register
  0. None   0x000000000000007f   0x0000000000000000

  1. None   0x00000000ffffffff   0x0000000000000000

  2. None   0x00000000000fffff   0x0000000000000000

  3. None   0x0000000000000007   0x0000000000000000

  4. None   0x0000000000003fff   0x0000000000000000

No register state available.

CP F/M/S Manufacturer   MHz Update Signature Features
 0 15,5,0 SomeBrandName 1394 0000000000000000 a0017fff

Note that this extension requires private HAL symbols. Without these symbols, the extension will display the message "HalpFeatureBits not found" along with basic CPU information. For example:

kd> !mca
HalpFeatureBits not found
CP F/M/S Manufacturer  MHz Update Signature Features
 0 6,5,1 GenuineIntel  334 0000004000000000 00001fff