forked from 0ad/0ad
janwas
fd3437d181
ia32: replace get_cur_processor_id with cpuid(0); move cpuid(func, regs) to asm - it takes care of detecting cpuid. This was SVN commit r2710.
67 lines
1.7 KiB
C
Executable File
67 lines
1.7 KiB
C
Executable File
#ifndef SYSDEP_CPU_H
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#define SYSDEP_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; // 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;
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extern int cpu_speedstep;
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extern int cpu_smp;
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// are there actually multiple physical processors,
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// not only logical hyperthreaded CPUs? relevant for wtime.
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// not possible with POSIX calls.
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// called from ia32.cpp check_smp
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extern int on_each_cpu(void(*cb)());
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extern void get_cpu_info(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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// internal use only
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extern bool cpuid(u32 func, u32* regs);
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#ifdef __cplusplus
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}
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#endif
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#endif
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