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| CPUID on Intel I5 3210-m https://forum.osdev.org/viewtopic.php?f=13&t=31895 |
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| Author: | Bipman [ Wed May 10, 2017 11:11 am ] |
| Post subject: | CPUID on Intel I5 3210-m |
Hi all I'm trying to find out if my CPU supports AVX which according to the INTEL Identification program it does but if I run the following INTEL code to check it says it doesn't :- Code: xor eax, eax cpuid cmp eax, 1 ; does CPUID support eax = 1? jb not_supported mov eax, 1 cpuid and ecx, 018000000h ;check 27 bit (OS uses XSAVE/XRSTOR) cmp ecx, 018000000h ; and 28 (AVX supported by CPU) jne not_supported xor ecx, ecx ; XFEATURE_ENABLED_MASK/XCR0 register number = 0 xgetbv ; XFEATURE_ENABLED_MASK register is in edx:eax and eax, 110b cmp eax, 110b ; check the AVX registers restore at context switch jne not_supported mov eax, 1 jmp $ not_supported: xor eax, eax jmp $ It fails at the bit 27,28 check above, any ideas? Bipman |
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| Author: | Geri [ Wed May 10, 2017 11:22 am ] |
| Post subject: | Re: CPUID on Intel I5 3210-m |
code seems wrong 0x018000000 to binary is 0b11000000000000000000000000000 avx is the 28th bit 27th bit has nothing to do with it |
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