mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-17 22:03:56 -07:00
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Timer implementation using ACPI PM timer
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*/
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#include "precompiled.h"
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#include "lib/sysdep/os/win/whrt/pmt.h"
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#include "lib/sysdep/os/win/whrt/counter.h"
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#include "lib/sysdep/os/win/win.h"
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#include "lib/sysdep/acpi.h"
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#include "lib/sysdep/os/win/mahaf.h"
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#include "lib/bits.h"
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static const u32 TMR_VAL_EXT = Bit<u32>(8); // FADT flags
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//-----------------------------------------------------------------------------
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class CounterPMT : public ICounter
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{
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public:
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CounterPMT()
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: m_portAddress(0xFFFF)
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{
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}
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virtual const char* Name() const
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{
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return "PMT";
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}
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Status Activate()
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{
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// mahaf is needed for port I/O.
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RETURN_STATUS_IF_ERR(mahaf_Init()); // (fails without Administrator privileges)
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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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return ERR::NOT_SUPPORTED; // NOWARN (ACPI tables might not be available)
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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 Shutdown()
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{
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}
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bool 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 Counter() const
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{
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return mahaf_ReadPort32(m_portAddress);
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}
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size_t 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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ENSURE(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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double NominalFrequency() const
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{
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return (double)PMT_FREQ;
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}
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double Resolution() const
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{
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return 1.0 / PMT_FREQ;
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}
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private:
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u16 m_portAddress;
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};
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ICounter* CreateCounterPMT(void* address, size_t size)
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{
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ENSURE(sizeof(CounterPMT) <= size);
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return new(address) CounterPMT();
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}
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