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Moves it to the hypervisor leafs. Before: ```bash $ FEXBash 'cat /proc/cpuinfo | grep "model name"' model name : FEX-2404-101-gf9effcb Cortex-A78C model name : FEX-2404-101-gf9effcb Cortex-A78C model name : FEX-2404-101-gf9effcb Cortex-A78C model name : FEX-2404-101-gf9effcb Cortex-A78C model name : FEX-2404-101-gf9effcb Cortex-X1C model name : FEX-2404-101-gf9effcb Cortex-X1C model name : FEX-2404-101-gf9effcb Cortex-X1C model name : FEX-2404-101-gf9effcb Cortex-X1C ``` After: ```bash $ FEXBash 'cat /proc/cpuinfo | grep "model name"' model name : Cortex-A78C model name : Cortex-A78C model name : Cortex-A78C model name : Cortex-A78C model name : Cortex-X1C model name : Cortex-X1C model name : Cortex-X1C model name : Cortex-X1C ``` Now the FEX string is in the hypervisor functions as a leaf, so if some utility wants the FEX version they can query that directly Ex: ```bash $ ./Bin/FEXInterpreter get_cpuid_fex Maximum 4000_0001h sub-leaf: 2 We are running under FEX on host: 2 FEX version string is: 'FEX-2404-113-g820494d' ```
51 lines
1.5 KiB
Markdown
51 lines
1.5 KiB
Markdown
# FEXCore custom CPUID functions
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## 4000_0000h - Hypervisor information function
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* Follows VMWare and Microsoft's hypervisor information proposal
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* https://lwn.net/Articles/301888/
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* 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
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* 4000_0001h
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* EBX - Hypervisor vendor ID signature
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* 'FEXI' - 4958_4546h
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* ECX - Hypervisor vendor ID signature
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* 'FEXI' - 4958_4546h
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* EDX - Hypervisor vendor ID signature
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* '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
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## 4000_0001h - Hypervisor config function
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### Sub-Leaf 0: ECX == 0
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* EAX:
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* Bits EAX[3:0] - Host architecture
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* 0 - Unknown architecture
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* 1 - x86_64
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* 2 - AArch64
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* 3-15: **Reserved**
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* Bits EAX[15:4] - **Reserved**
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* Bits EAX[31:16] - Maximum subleaf input value for CPUID function 4000_0001h
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* EBX - **Reserved** - Read as zero
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* ECX - **Reserved** - Read as zero
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* EDX - **Reserved** - Read as zero
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### Sub-leaf 1: ECX == 1
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* FEX version string signature. First 16-bytes
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* memcpy eax:ebx:ecx:edx in to the first 16-bytes of a string.
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### Sub-leaf 2: ECX == 2
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* FEX version string signature. Second 16-bytes
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* memcpy eax:ebx:ecx:edx in to the second 16-bytes of a string.
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### Sub-Leaf 0000_0003 - FFFF_FFFF: **Reserved**
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## 4000_0002h - 4000_000Fh
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* **Reserved range**
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* Returns zero until implemented
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## 4000_0010h - 4FFF_FFFFh
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* **Undefined**
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* FEX-Emu will return zero until implemented
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