forked from mirrors/0ad
janwas
c0ed950657
this snowballed into a massive search+destroy of the hodgepodge of mostly equivalent types we had in use (int, uint, unsigned, unsigned int, i32, u32, ulong, uintN). it is more efficient to use 64-bit types in 64-bit mode, so the preferred default is size_t (for anything remotely resembling a size or index). tile coordinates are ssize_t to allow more efficient conversion to/from floating point. flags are int because we almost never need more than 15 distinct bits, bit test/set is not slower and int is fastest to type. finally, some data that is pretty much directly passed to OpenGL is now typed accordingly. after several hours, the code now requires fewer casts and less guesswork. other changes: - unit and player IDs now have an "invalid id" constant in the respective class to avoid casting and -1 - fix some endian/64-bit bugs in the map (un)packing. added a convenience function to write/read a size_t. - ia32: change CPUID interface to allow passing in ecx (required for cache topology detection, which I need at work). remove some unneeded functions from asm, replace with intrinsics where possible. This was SVN commit r5942.
127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
/**
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* =========================================================================
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* File : wcpu.cpp
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* Project : 0 A.D.
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* Description : Windows implementation of sysdep/cpu
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "../cpu.h"
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#include "win.h"
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#include "lib/bits.h"
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static LibError ReadFrequencyFromRegistry(DWORD* freqMhz)
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{
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HKEY hKey;
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if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", 0, KEY_QUERY_VALUE, &hKey) != ERROR_SUCCESS)
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return ERR::NO_SYS;
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DWORD size = sizeof(*freqMhz);
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LONG ret = RegQueryValueEx(hKey, "~MHz", 0, 0, (LPBYTE)freqMhz, &size);
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RegCloseKey(hKey);
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if(ret != ERROR_SUCCESS)
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WARN_RETURN(ERR::FAIL);
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return INFO::OK;
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}
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double cpu_ClockFrequency()
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{
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DWORD freqMhz;
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if(ReadFrequencyFromRegistry(&freqMhz) < 0)
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return -1.0;
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const double clockFrequency = freqMhz * 1e6;
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return clockFrequency;
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}
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size_t cpu_NumProcessors()
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si); // can't fail
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const size_t numProcessors = (size_t)si.dwNumberOfProcessors;
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return numProcessors;
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}
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size_t cpu_PageSize()
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si); // can't fail
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const size_t pageSize = (size_t)si.dwPageSize;
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return pageSize;
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}
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size_t cpu_MemorySize(CpuMemoryIndicators mem_type)
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{
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// note: we no longer bother dynamically importing GlobalMemoryStatusEx -
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// it's available on Win2k and above. this function safely handles
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// systems with > 4 GB of memory.
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MEMORYSTATUSEX mse = { sizeof(mse) };
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BOOL ok = GlobalMemoryStatusEx(&mse);
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WARN_IF_FALSE(ok);
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if(mem_type == CPU_MEM_TOTAL)
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{
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size_t memoryTotal = (size_t)mse.ullTotalPhys;
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// Richter, "Programming Applications for Windows": the reported
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// value doesn't include non-paged pool reserved during boot;
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// it's not considered available to the kernel. (the amount is
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// 528 KiB on a 512 MiB WinXP/Win2k machine). we'll round up
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// to the nearest megabyte to fix this.
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memoryTotal = round_up(memoryTotal, 1*MiB);
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return memoryTotal;
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}
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else
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{
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const size_t memoryAvailable = (size_t)mse.ullAvailPhys;
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return memoryAvailable;
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}
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}
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LibError cpu_CallByEachCPU(CpuCallback cb, void* param)
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{
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const HANDLE hProcess = GetCurrentProcess();
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DWORD_PTR process_affinity, system_affinity;
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if(!GetProcessAffinityMask(hProcess, &process_affinity, &system_affinity))
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WARN_RETURN(ERR::FAIL);
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// our affinity != system affinity: OS is limiting the CPUs that
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// this process can run on. fail (cannot call back for each CPU).
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if(process_affinity != system_affinity)
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WARN_RETURN(ERR::CPU_RESTRICTED_AFFINITY);
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for(DWORD_PTR cpu_bit = 1; cpu_bit != 0 && cpu_bit <= process_affinity; cpu_bit *= 2)
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{
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// check if we can switch to target CPU
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if(!(process_affinity & cpu_bit))
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continue;
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// .. and do so.
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if(!SetThreadAffinityMask(GetCurrentThread(), cpu_bit))
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{
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WARN_ERR(ERR::CPU_RESTRICTED_AFFINITY);
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continue;
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}
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// reschedule to make sure we switch CPUs.
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Sleep(1);
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cb(param);
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}
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// restore to original value
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SetThreadAffinityMask(hProcess, process_affinity);
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return INFO::OK;
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}
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