92 lines
2.4 KiB
C
92 lines
2.4 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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const size_t CPU_TYPE_LEN = 49; // IA32 processor brand string is <= 48 chars
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extern char cpu_type[CPU_TYPE_LEN];
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extern double cpu_freq;
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// -1 if detect not yet called, or cannot be determined:
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extern int cpus; // # packages (i.e. sockets; > 1 => SMP system)
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extern int cpu_ht_units; // degree of hyperthreading, typically 2
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extern int cpu_cores; // cores per package, typically 2
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extern int cpu_speedstep;
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extern void cpu_init(void);
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extern size_t tot_mem;
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extern size_t avl_mem;
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// updates *_mem above
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extern void get_mem_status(void);
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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 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) CAS_((uintptr_t*)l, (uintptr_t)o, (uintptr_t)n)
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extern void atomic_add(intptr_t* location, intptr_t increment);
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// enforce strong memory ordering.
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extern void mfence();
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extern void serialize();
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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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