mirror of https://github.com/PCSX2/pcsx2.git
138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
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// SPDX-License-Identifier: GPL-3.0+
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#include "HostSys.h"
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#include "Console.h"
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#include "VectorIntrin.h"
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static u32 PAUSE_TIME = 0;
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static void MultiPause()
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{
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#ifdef _M_X86
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_mm_pause();
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_mm_pause();
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_mm_pause();
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_mm_pause();
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_mm_pause();
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_mm_pause();
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_mm_pause();
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_mm_pause();
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#elif defined(_M_ARM64) && defined(_MSC_VER)
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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__isb(_ARM64_BARRIER_SY);
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#elif defined(_M_ARM64)
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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__asm__ __volatile__("isb");
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#else
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#error Unknown architecture.
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#endif
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}
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static u32 MeasurePauseTime()
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{
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// GetCPUTicks may have resolution as low as 1µs
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// One call to MultiPause could take anywhere from 20ns (fast Haswell) to 400ns (slow Skylake)
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// We want a measurement of reasonable resolution, but don't want to take too long
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// So start at a fairly small number and increase it if it's too fast
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for (int testcnt = 64; true; testcnt *= 2)
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{
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u64 start = GetCPUTicks();
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for (int i = 0; i < testcnt; i++)
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{
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MultiPause();
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}
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u64 time = GetCPUTicks() - start;
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if (time > 100)
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{
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u64 nanos = (time * 1000000000) / GetTickFrequency();
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return (nanos / testcnt) + 1;
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}
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}
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}
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__noinline static void UpdatePauseTime()
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{
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u64 wait = GetCPUTicks() + GetTickFrequency() / 100; // Wake up processor (spin for 10ms)
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while (GetCPUTicks() < wait)
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;
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u32 pause = MeasurePauseTime();
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// Take a few measurements in case something weird happens during one
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// (e.g. OS interrupt)
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for (int i = 0; i < 4; i++)
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pause = std::min(pause, MeasurePauseTime());
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PAUSE_TIME = pause;
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DevCon.WriteLn("MultiPause time: %uns", pause);
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}
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u32 ShortSpin()
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{
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u32 inc = PAUSE_TIME;
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if (inc == 0) [[unlikely]]
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{
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UpdatePauseTime();
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inc = PAUSE_TIME;
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}
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u32 time = 0;
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// Sleep for approximately 500ns
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for (; time < 500; time += inc)
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MultiPause();
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return time;
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}
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static u32 GetSpinTime()
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{
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if (char* req = getenv("WAIT_SPIN_MICROSECONDS"))
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{
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return 1000 * atoi(req);
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}
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else
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{
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return 50 * 1000; // 50µs
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}
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}
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const u32 SPIN_TIME_NS = GetSpinTime();
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#ifdef __APPLE__
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// https://alastairs-place.net/blog/2013/01/10/interesting-os-x-crash-report-tidbits/
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// https://opensource.apple.com/source/WebKit2/WebKit2-7608.3.10.0.3/Platform/spi/Cocoa/CrashReporterClientSPI.h.auto.html
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struct crash_info_t
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{
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u64 version;
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u64 message;
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u64 signature;
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u64 backtrace;
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u64 message2;
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u64 reserved;
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u64 reserved2;
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};
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#define CRASH_ANNOTATION __attribute__((used, section("__DATA,__crash_info")))
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#define CRASH_VERSION 4
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extern "C" crash_info_t gCRAnnotations CRASH_ANNOTATION = { CRASH_VERSION };
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#endif
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void AbortWithMessage(const char* msg)
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{
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#ifdef __APPLE__
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gCRAnnotations.message = reinterpret_cast<size_t>(msg);
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// Some macOS's seem to have issues displaying non-static `message`s, so throw it in here too
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gCRAnnotations.backtrace = gCRAnnotations.message;
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#endif
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abort();
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}
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