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4cf48ca9bb
Exposes the host architecture through this CPUID function. Only exposes the architectures we support. Not burning 16-bits on using ELF machine definitions here. Uses 4 bits still for future expansion.
1.2 KiB
1.2 KiB
FEXCore custom CPUID functions
4000_0000h - Hypervisor information function
-
Follows VMWare and Microsoft's hypervisor information proposal
-
https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/feature-discovery
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EAX - The maximum input value for the hypervisor CPUID information
- 4000_0001h
-
EBX - Hypervisor vendor ID signature
- 'FEXI' - 4958_4546h
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ECX - Hypervisor vendor ID signature
- 'FEXI' - 4958_4546h
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EDX - Hypervisor vendor ID signature
- 'EMU\0' - 0055_4d45h
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memcpy ebx:ecx:edx in to a 12 byte string to get 'FEXIFEXIEMU\0' for determining running under FEX
4000_0001h - Hypervisor config function
Sub-Leaf 0: ECX == 0
- EAX:
- Bits EAX[3:0] - Host architecture
- 0 - Unknown architecture
- 1 - x86_64
- 2 - AArch64
- 3-15: Reserved
- Bits EAX[3:0] - Host architecture
- EBX - Reserved - Read as zero
- ECX - Reserved - Read as zero
- EDX - Reserved - Read as zero
Sub-Leaf 0000_0001 - FFFF_FFFF: Reserved
4000_0002h - 4000_000Fh
- Reserved range
- Returns zero until implemented
4000_0010h - 4FFF_FFFFh
- Undefined
- FEX-Emu will return zero until implemented