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/* Copyright (C) 2010 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Timer implementation using ACPI PM timer
*/
#include "precompiled.h"
#include "lib/sysdep/os/win/whrt/pmt.h"
#include "lib/sysdep/os/win/whrt/counter.h"
#include "lib/sysdep/os/win/win.h"
#include "lib/sysdep/acpi.h"
#include "lib/sysdep/os/win/mahaf.h"
#include "lib/bits.h"
static const u32 TMR_VAL_EXT = Bit<u32>(8); // FADT flags
//-----------------------------------------------------------------------------
class CounterPMT : public ICounter
{
public:
CounterPMT()
: m_portAddress(0xFFFF)
{
}
virtual const char* Name() const
{
return "PMT";
}
Status Activate()
{
// mahaf is needed for port I/O.
RETURN_STATUS_IF_ERR(mahaf_Init()); // (fails without Administrator privileges)
// (note: it's called FADT, but the signature is "FACP")
const FADT* fadt = (const FADT*)acpi_GetTable("FACP");
if(!fadt)
return ERR::NOT_SUPPORTED; // NOWARN (ACPI tables might not be available)
m_portAddress = u16_from_larger(fadt->pmTimerPortAddress);
return INFO::OK;
}
void Shutdown()
{
}
bool IsSafe() const
{
// the PMT has one issue: "Performance counter value may unexpectedly
// leap forward" (Q274323). This happens on some buggy Pentium-era
// systems under heavy PCI bus load. We are clever and observe that
// the TSC implementation would be used on such systems (because it
// has higher precedence and is safe on P5 CPUs), so the PMT is fine
// in general.
return true;
}
u64 Counter() const
{
return mahaf_ReadPort32(m_portAddress);
}
size_t CounterBits() const
{
// (see previous acpi_GetTable call)
const FADT* fadt = (const FADT*)acpi_GetTable("FACP");
ENSURE(fadt); // Activate made sure FADT is available
const size_t counterBits = (fadt->flags & TMR_VAL_EXT)? 32 : 24;
return counterBits;
}
double NominalFrequency() const
{
return (double)PMT_FREQ;
}
double Resolution() const
{
return 1.0 / PMT_FREQ;
}
private:
u16 m_portAddress;
};
ICounter* CreateCounterPMT(void* address, size_t size)
{
ENSURE(sizeof(CounterPMT) <= size);
return new(address) CounterPMT();
}
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