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janwas
ffdff6888d
enable most of IA-32 specific code to be used in amd64 (resides in directory lib/sysdep/x86_x64) bits: add IsBitSet remove mem_PageSize (use os_cpu_PageSize instead) cpuid: change interface to allow gracefully supporting later subfunctions that require input parameters amd64_asm.asm: add amd64 implementation of cpuid cpu: move functions provided by OS to sysdep/os_cpu.cpp cpu topology: avoid trouble when process affinity is set by remapping processor numbers to 0..PopulationCount(processAffinity) topology.cpp: move ex-ia32 topology code here. This was SVN commit r5945.
106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
/**
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* =========================================================================
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* File : cpu.h
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* Project : 0 A.D.
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* Description : CPU and memory detection.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_CPU
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#define INCLUDED_CPU
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namespace ERR
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{
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const LibError CPU_FEATURE_MISSING = -130000;
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const LibError CPU_UNKNOWN_OPCODE = -130001;
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const LibError CPU_UNKNOWN_VENDOR = -130002;
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}
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//-----------------------------------------------------------------------------
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// CPU detection
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/**
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* @return string identifying the CPU (usually a cleaned-up version of the
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* brand string)
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**/
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LIB_API const char* cpu_IdentifierString();
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/**
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* @return a rough estimate of the CPU clock frequency.
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*
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* note: the accuracy of this value is not important. while it is used by
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* the TSC timing backend, thermal drift is an issue that requires
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* continual recalibration anyway, which makes the initial accuracy moot.
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* querying frequency via OS is also much faster than ia32's measurement loop.
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**/
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LIB_API double cpu_ClockFrequency();
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//-----------------------------------------------------------------------------
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// lock-free support routines
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/**
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* atomic "compare and swap".
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*
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* @param location address of the word to compare and possibly overwrite
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* @param expected its expected value
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* @param newValue the value with which to replace it
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* @return false if the target word doesn't match the expected value,
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* otherwise true (also overwriting the contents of location)
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**/
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LIB_API bool cpu_CAS(volatile uintptr_t* location, uintptr_t expected, uintptr_t newValue);
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/**
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* specialization of cpu_CAS for pointer types. this avoids error-prone
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* casting in user code.
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**/
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template<typename T>
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bool cpu_CAS(volatile T* location, T expected, T new_value)
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{
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return cpu_CAS((volatile uintptr_t*)location, (uintptr_t)expected, (uintptr_t)new_value);
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}
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/**
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* add a signed value to a variable without the possibility of interference
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* from other threads/CPUs.
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**/
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LIB_API void cpu_AtomicAdd(volatile intptr_t* location, intptr_t increment);
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/**
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* enforce strict instruction ordering in the CPU pipeline.
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**/
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LIB_API void cpu_Serialize();
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/**
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* enforce strong memory ordering.
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**/
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LIB_API void cpu_MemoryFence();
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//-----------------------------------------------------------------------------
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// misc
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/**
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* drop-in replacement for POSIX memcpy().
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**/
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LIB_API void* cpu_memcpy(void* RESTRICT dst, const void* RESTRICT src, size_t size);
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/**
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* set the FPU control word to "desirable" values (see implementation)
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**/
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LIB_API void cpu_ConfigureFloatingPoint();
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// convert float to int much faster than _ftol2, which would normally be
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// used by (int) casts.
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// VC8 and GCC with -ffast-math now manage to generate SSE instructions,
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// so our implementation is no longer needed.
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#define cpu_i32FromFloat(f) ((i32)f)
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#define cpu_i32FromDouble(d) ((i32)d)
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#define cpu_i64FromDouble(d) ((i64)d)
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#endif // #ifndef INCLUDED_CPU
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