127 lines
3.8 KiB
C++
127 lines
3.8 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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const LibError CPU_RESTRICTED_AFFINITY = -130003;
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}
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// must be called before any of the below accessors.
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extern void cpu_Init();
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extern void cpu_Shutdown();
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extern const char* cpu_IdentifierString();
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extern double cpu_ClockFrequency();
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extern uint cpu_NumPackages(); // i.e. sockets
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extern uint cpu_CoresPerPackage();
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extern uint cpu_LogicalPerCore();
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// faster than cpu_MemorySize (caches total size determined during init),
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// returns #Mebibytes (cleaned up to account e.g. for nonpaged pool)
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extern size_t cpu_MemoryTotalMiB();
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//
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// misc (stateless)
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//
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// atomic "compare and swap". compare the machine word at <location> against
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// <expected>; if not equal, return false; otherwise, overwrite it with
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// <new_value> and return true.
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extern bool cpu_CAS(volatile uintptr_t* location, uintptr_t expected, uintptr_t new_value);
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// this is often used for pointers, so the macro coerces parameters to
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// uintptr_t. invalid usage unfortunately also goes through without warnings.
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// to catch cases where the caller has passed <expected> as <location> or
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// similar mishaps, the implementation verifies <location> is a valid pointer.
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#define CAS(l,o,n) cpu_CAS((volatile uintptr_t*)l, (uintptr_t)o, (uintptr_t)n)
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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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extern void cpu_AtomicAdd(volatile intptr_t* location, intptr_t increment);
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extern void cpu_Serialize();
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// enforce strong memory ordering.
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extern void cpu_MemoryFence();
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enum CpuMemoryIndicators
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{
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CPU_MEM_TOTAL, CPU_MEM_AVAILABLE
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};
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extern size_t cpu_MemorySize(CpuMemoryIndicators mem_type);
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// drop-in replacement for libc memcpy(). only requires CPU support for
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// MMX (by now universal). highly optimized for Athlon and Pentium III
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// microarchitectures; significantly outperforms VC7.1 memcpy and memcpy_amd.
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// for details, see accompanying article.
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extern void* cpu_memcpy(void* RESTRICT dst, const void* RESTRICT src, size_t size);
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/**
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* @return the number of what the OS deems "processors" or -1 on failure.
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*
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* this is used by ia32 when it cannot determine the number via APIC IDs.
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* in other situations, the cpu_NumPackages et al. functions are preferable
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* since they are more specific.
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*
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* note: this function is necessary because POSIX sysconf _SC_NPROCESSORS_CONF
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* is not suppored on MacOSX, else we would use that.
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**/
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extern int cpu_OsNumProcessors();
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// execute the specified function once on each CPU.
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// this includes logical HT units and proceeds serially (function
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// is never re-entered) in order of increasing OS CPU ID.
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// note: implemented by switching thread affinity masks and forcing
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// a reschedule, which is apparently not possible with POSIX.
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//
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// may fail if e.g. OS is preventing us from running on some CPUs.
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// called from ia32.cpp get_cpu_count.
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typedef void (*CpuCallback)(void* param);
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extern LibError cpu_CallByEachCPU(CpuCallback cb, void* param);
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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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extern i32 cpu_i32FromFloat(float f);
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extern i32 cpu_i32FromDouble(double d);
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extern i64 cpu_i64FromDouble(double d);
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// Win32 CONTEXT field abstraction
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// (there's no harm also defining this for other platforms)
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#if CPU_AMD64
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# define PC_ Rip
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# define FP_ Rbp
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# define SP_ Rsp
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#elif CPU_IA32
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# define PC_ Eip
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# define FP_ Ebp
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# define SP_ Esp
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#endif
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#endif // #ifndef INCLUDED_CPU
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