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https://github.com/tribes2/engine.git
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97 lines
2.3 KiB
NASM
97 lines
2.3 KiB
NASM
;-----------------------------------------------------------------------------
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; V12 Engine
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;
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; Copyright (c) 2001 GarageGames.Com
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; Portions Copyright (c) 2001 by Sierra Online, Inc.
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;-----------------------------------------------------------------------------
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segment .text
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; this is a nice macro Rick
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; syntax: export_fn <function name>
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%macro export_fn 1
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%ifdef LINUX
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; No underscore needed for ELF object files
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global %1
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%1:
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%else
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global _%1
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_%1:
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%endif
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%endmacro
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; so is this
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;%define arg(x) [esp+(x*4)]
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; void isCPUIDSupported(char *vendor, U32 *properties, U32 *processor);
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export_fn isCPUIDSupported
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; mov ebp, esp
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push ebp
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push ebx
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push edx
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push ecx
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; mov ecx, arg(1)
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; mov edx, arg(2)
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; mov eax, arg(3)
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pushfd
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pushfd ; save EFLAGS to stack
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pop eax ; move EFLAGS into EAX
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mov ebx, eax
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xor eax, 0x200000 ; flip bit 21
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push eax
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popfd ; restore EFLAGS
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pushfd
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pop eax
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cmp eax, ebx
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jz EXIT ; doesn't support CPUID instruction
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;
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; get vendor information using CPUID eax == 0
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xor eax, eax
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cpuid
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; mov dword [vendor], ebx
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; mov dword [vendor+4], edx
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; mov dword [vendor+8], ecx
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mov dword [esp+8], ebx
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mov dword [esp+12], edx
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mov dword [esp+16], ecx
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popfd
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pop ecx
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pop edx
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pop ebx
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leave
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; pop ebp
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; mov esp, ebp
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ret
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;jz EXIT
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; get generic extended CPUID info
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mov eax, 1
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cpuid ; eax=1, so cpuid queries feature information
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and eax, 0x0FF0
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mov [esp+20], eax ; just store the model bits
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mov [esp+16], edx
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; want to check for 3DNow(tm). need to see if extended cpuid functions present.
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000000
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jbe MAYBE_3DLATER
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mov eax, 0x80000001
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cpuid
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and edx, 0x80000000 ; 3DNow if bit 31 set -> put bit in our properties
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or [esp+16], edx
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MAYBE_3DLATER:
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EXIT:
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popfd
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pop ecx
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pop edx
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pop ebx
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ret
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