AMD Processor Recognition Code Sample Drivers (2019)


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AMD Processor Recognition Code Sample Driver

Available for identifying the processor and its features. The following code sample demonstrates the way a program uses the PUSHFD and POPFD instructions. CPUID instruction, see the AMD Processor Recognition. Application Note following code sample shows how to test for 3DNow! instruction support. mov. Figure 6: Register Instance Table: MSR Range Example. Figure 7: .. The CPUID, or x86 processor identification state, physical register mnemonic format is of the .. power states in which the processor is not executing code.


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AMD Processor Recognition Code Sample Driver

All reserved bits read as zero RAZ. If a field is not supported on a particular processor, all of the bits in that field will be returned as zeros.

Driver for AMD Processor Recognition Code Sample

The CPUID instruction attempts to find all information associated with a given function number, AMD Processor Recognition Code Sample if the function does not exist. For AMD processors, the highest standard function number is always 1 standard functions 0 and 1 are the only standard functions supported by all AMD processors.

DX4 microprocessor, and Am5x86? Both function identify supported processor features, as well as processor family, model, and version information. Additionally, each processor has a stepping or revision number.

GitHub - google/cpu_features: A cross platform C99 library to get cpu features at runtime.

The family number, model number, and stepping number form the processor signature. The processor signature is important for various purposes. The processor signature is also used to determine whether a microcode patch is applicable to a given processor. Figure shows the format of AMD Processor Recognition Code Sample processor signature returned in EAX. The latest stepping information is found in the revision guide for the particular processor.

Family and Model Number Each processor family is assigned a 4-bit family number. Within a family, processors are further classified by a 4-bit model number.

On all AMD-K6? While differences are small, they are important; for certain purposes, the use of the family number returned by the extended function may be required, rather than that returned by the standard function. Table 3 shows the processor signatures for AMD processors up to effective family 6: Family [ Contact your AMD representative for model identifier information.

Khronosdotorg/ at master · KhronosGroup/Khronosdotorg · GitHub

Stepping ID may change. Consult the appropriate processor revision guide, or contact your AMD representative for the latest stepping information.

AMD Athlon processors of the same model numbers share the same revision guide. AMD Duron processors of the same model number share the same revision guide.

Driver for AMD Processor Recognition Code Sample

Currently, none of the standard feature bits require AMD Processor Recognition Code Sample rules of interpretation. Extended Feature Support Some EDX register bits are subject to idiosyncratic interpretation, depending on the processor family, model, and other factors. These are summarized in Table 4 on page This support is disabled by default; so, the BIOS must enable the feature.

See the AMD Athlon? The first character resides in the least significant byte of EAX, and the last character of this group of 16 resides in the most significant byte of EDX. The AMD Athlon? These model specific registers were initialized to a default name string on reset. General Purpose and System Programming, order The value in this field represents the size of the cache in Kbytes.

Drivers AMD Processor Recognition Code Sample

Except for 00h reserved and FFh Fullthe number returned in the associativity field represents the actual number of ways. For example, a returned value of 02h indicates two-way associativity and a returned value of 04h indicates four-way associativity. The value in this field represents the actual AMD Processor Recognition Code Sample of cache lines per tag.

The value in this field represents the size of a cache line in Kbytes.

Training Material and Code Samples

EDX bit 0 indicates the availability of a thermal sensor. Thermal Trip TTP. EDX bit 3 indicates the availability of thermal trip control.

Thermal Monitor TM. EDX bit 4 indicates the presence of an external thermal monitor. This character string appears in a variety of contexts that provide AMD Processor Recognition Code Sample system and application software configuration information. At the time these processors appeared on the market, the processor landscape was simple enough that the name string could be programmed into the BIOS and operating system software by reference to the processor signature returned by CPUID standard function 1.

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