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https://gitea.wildfiregames.com/0ad/0ad.git
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janwas
04127c7af3
- topology.cpp: modify interface due to thread-safety issue. caller is now responsible for ensuring the first _Detect call isn't reentered; everything else is safe. - fix thread-safety issue in wnuma; use winit mechanism to ensure it's ready before use - VFS now takes a cacheSize parameter (required for being able to disable read-only file caches for the image loader at work) - allow dynarray that isn't actually holding memory - debug_stl: VC9 fix (disable this code except on the exact STL version on which it was tested) - zlib, lib_api: changes to macro used to toggle between static and dynamic linking - add boost filesystem header in external_libraries - amd64: cpu_ topology functions are now provided by x86_x64 - cpu: remove cpu_ClockFrequency (dangerous, may be tempting to use during WHRT init which would cause a crash). use x86_x64_ClockFrequency or os_cpu_ClockFrequency instead. - werrno: cope with newer boost versions - wmman: follow SUSv3 in rejecting zero-length mappings This was SVN commit r5954.
93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/**
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* =========================================================================
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* File : pmt.cpp
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* Project : 0 A.D.
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* Description : Timer implementation using ACPI PM timer
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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 "pmt.h"
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#include "lib/sysdep/win/win.h"
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#include "lib/sysdep/acpi.h"
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#include "lib/sysdep/win/mahaf.h"
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#include "lib/bits.h"
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#pragma pack(push,1)
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struct FADT
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{
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AcpiTable header;
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u8 unused[40];
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u32 pmTimerPortAddress;
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u8 unused2[32];
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u32 flags;
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};
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#pragma pack(pop)
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static const u32 TMR_VAL_EXT = BIT(8);
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//-----------------------------------------------------------------------------
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LibError CounterPMT::Activate()
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{
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// mahaf is needed for port I/O.
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if(!mahaf_Init())
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return ERR::FAIL; // NOWARN (no Administrator privileges)
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if(!acpi_Init())
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return ERR::FAIL; // NOWARN (happens on Win2k; see mahaf_IsPhysicalMappingDangerous)
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// (note: it's called FADT, but the signature is "FACP")
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const FADT* fadt = (const FADT*)acpi_GetTable("FACP");
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if(!fadt)
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WARN_RETURN(ERR::NO_SYS);
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m_portAddress = u16_from_larger(fadt->pmTimerPortAddress);
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return INFO::OK;
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}
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void CounterPMT::Shutdown()
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{
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acpi_Shutdown();
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mahaf_Shutdown();
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}
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bool CounterPMT::IsSafe() const
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{
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// the PMT has one issue: "Performance counter value may unexpectedly
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// leap forward" (Q274323). This happens on some buggy Pentium-era
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// systems under heavy PCI bus load. We are clever and observe that
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// the TSC implementation would be used on such systems (because it
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// has higher precedence and is safe on P5 CPUs), so the PMT is fine
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// in general.
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return true;
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}
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u64 CounterPMT::Counter() const
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{
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return mahaf_ReadPort32(m_portAddress);
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}
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/**
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* WHRT uses this to ensure the counter (running at nominal frequency)
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* doesn't overflow more than once during CALIBRATION_INTERVAL_MS.
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**/
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size_t CounterPMT::CounterBits() const
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{
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// (see previous acpi_GetTable call)
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const FADT* fadt = (const FADT*)acpi_GetTable("FACP");
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debug_assert(fadt); // Activate made sure FADT is available
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const size_t counterBits = (fadt->flags & TMR_VAL_EXT)? 32 : 24;
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return counterBits;
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}
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/**
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* initial measurement of the tick rate. not necessarily correct
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* (e.g. when using TSC: os_cpu_ClockFrequency isn't exact).
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**/
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double CounterPMT::NominalFrequency() const
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{
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return (double)PMT_FREQ;
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}
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