MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. 0000008Bh - Pentium Pro - "BIOS_SIGN" BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. UPDATE SIGNATURE
Size: 64 bits
Access: Read/Write
Desc: used to determine which (if any) microcode update has been loaded into
the CPU(Central Processing Unit) The microprocessor which executes programs on your computer.
Notes: whenever a microcode update is loaded, the PentiumPro modifies the
operation of the CPUID instruction to store both the standard CPUID
model information and a 32-bit microcode update ID into this MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors.; if
no microcode update has been loaded, the MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. remains unchanged
(it is normally cleared to 0 before using CPUID to test for updates)
the low 32 bits of this register (if modified by CPUID) contains the
standard model/stepping information, while the high 32 bits contain
the microcode update ID
SeeAlso: MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. 00000079h