forked from 0ad/0ad
janwas
623e649acb
all cpu-related stuff is now defined in cpu.h (with cpu_ prefix and fully encapsulated). fix quite brittle core/HT unit/package detection. implement mkdir on VC8, where it is deprecated add strdup on MacOSX move ia32 code into separate subdir. functions implemented in asm are called ia32_asm_*. add some unix versions of sysdep functions (cannot test them) timer: fix for amd64 linux This was SVN commit r4995.
138 lines
3.8 KiB
C++
138 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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* @author Jan.Wassenberg@stud.uni-karlsruhe.de
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* =========================================================================
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*/
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/*
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* Copyright (c) 2003-2005 Jan Wassenberg
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*
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* Redistribution and/or modification are also permitted under the
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* terms of the GNU General Public License as published by the
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* Free Software Foundation (version 2 or later, at your option).
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef CPU_H__
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#define CPU_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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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(void);
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extern bool cpu_isModuleInitialized();
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extern const char* cpu_identifierString();
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extern double cpu_clockFrequency();
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extern int cpu_numPackages(); // i.e. sockets
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extern int cpu_coresPerPackage();
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extern int cpu_logicalPerPackage();
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extern bool cpu_isThrottlingPossible();
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//
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// memory
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//
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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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// 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
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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(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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// uinptr_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((uintptr_t*)l, (uintptr_t)o, (uintptr_t)n)
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extern void cpu_atomic_add(intptr_t* location, intptr_t increment);
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// enforce strong memory ordering.
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extern void cpu_mfence();
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extern void cpu_serialize();
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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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// 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_i32_from_float(float f);
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extern i32 cpu_i32_from_double(double d);
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extern i64 cpu_i64_from_double(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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#ifdef __cplusplus
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}
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#endif
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#endif // #ifndef CPU_H__
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