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;; Licensed to the .NET Foundation under one or more agreements.
;; The .NET Foundation licenses this file to you under the MIT license.
;; See the LICENSE file in the project root for more information.
include AsmMacros.inc
;; extern "C" DWORD getcpuid(DWORD arg, unsigned char result[16]);
NESTED_ENTRY getcpuid, _TEXT
push_nonvol_reg rbx
push_nonvol_reg rsi
END_PROLOGUE
mov eax, ecx ; first arg
mov rsi, rdx ; second arg (result)
cpuid
mov [rsi+ 0], eax
mov [rsi+ 4], ebx
mov [rsi+ 8], ecx
mov [rsi+12], edx
pop rsi
pop rbx
ret
NESTED_END getcpuid, _TEXT
;The following function uses Deterministic Cache Parameter leafs to crack the cache hierarchy information on Prescott & Above platforms.
; This function takes 3 arguments:
; Arg1 is an input to ECX. Used as index to specify which cache level to return information on by CPUID.
; Arg1 is already passed in ECX on call to getextcpuid, so no explicit assignment is required;
; Arg2 is an input to EAX. For deterministic code enumeration, we pass in 4H in arg2.
; Arg3 is a pointer to the return dwbuffer
NESTED_ENTRY getextcpuid, _TEXT
push_nonvol_reg rbx
push_nonvol_reg rsi
END_PROLOGUE
mov eax, edx ; second arg (input to EAX)
mov rsi, r8 ; third arg (pointer to return dwbuffer)
cpuid
mov [rsi+ 0], eax
mov [rsi+ 4], ebx
mov [rsi+ 8], ecx
mov [rsi+12], edx
pop rsi
pop rbx
ret
NESTED_END getextcpuid, _TEXT
end
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