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// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
// SPDX-License-Identifier: GPL-3.0+
#include "HostSys.h"
#include "Console.h"
#include "VectorIntrin.h"
#ifndef __APPLE__
#include "cpuinfo.h"
#endif
static u32 PAUSE_TIME = 0;
static void MultiPause()
{
#ifdef _M_X86
_mm_pause();
_mm_pause();
_mm_pause();
_mm_pause();
_mm_pause();
_mm_pause();
_mm_pause();
_mm_pause();
#elif defined(_M_ARM64) && defined(_MSC_VER)
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
__isb(_ARM64_BARRIER_SY);
#elif defined(_M_ARM64)
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
__asm__ __volatile__("isb");
#else
#error Unknown architecture.
#endif
}
static u32 MeasurePauseTime()
{
// GetCPUTicks may have resolution as low as 1µs
// One call to MultiPause could take anywhere from 20ns (fast Haswell) to 400ns (slow Skylake)
// We want a measurement of reasonable resolution, but don't want to take too long
// So start at a fairly small number and increase it if it's too fast
for (int testcnt = 64; true; testcnt *= 2)
{
u64 start = GetCPUTicks();
for (int i = 0; i < testcnt; i++)
{
MultiPause();
}
u64 time = GetCPUTicks() - start;
if (time > 100)
{
u64 nanos = (time * 1000000000) / GetTickFrequency();
return (nanos / testcnt) + 1;
}
}
}
__noinline static void UpdatePauseTime()
{
u64 wait = GetCPUTicks() + GetTickFrequency() / 100; // Wake up processor (spin for 10ms)
while (GetCPUTicks() < wait)
;
u32 pause = MeasurePauseTime();
// Take a few measurements in case something weird happens during one
// (e.g. OS interrupt)
for (int i = 0; i < 4; i++)
pause = std::min(pause, MeasurePauseTime());
PAUSE_TIME = pause;
DevCon.WriteLn("MultiPause time: %uns", pause);
}
u32 ShortSpin()
{
u32 inc = PAUSE_TIME;
if (inc == 0) [[unlikely]]
{
UpdatePauseTime();
inc = PAUSE_TIME;
}
u32 time = 0;
// Sleep for approximately 500ns
for (; time < 500; time += inc)
MultiPause();
return time;
}
static u32 GetSpinTime()
{
if (char* req = getenv("WAIT_SPIN_MICROSECONDS"))
{
return 1000 * atoi(req);
}
else
{
return 50 * 1000; // 50µs
}
}
const u32 SPIN_TIME_NS = GetSpinTime();
#ifdef __APPLE__
// https://alastairs-place.net/blog/2013/01/10/interesting-os-x-crash-report-tidbits/
// https://opensource.apple.com/source/WebKit2/WebKit2-7608.3.10.0.3/Platform/spi/Cocoa/CrashReporterClientSPI.h.auto.html
struct crash_info_t
{
u64 version;
u64 message;
u64 signature;
u64 backtrace;
u64 message2;
u64 reserved;
u64 reserved2;
};
#define CRASH_ANNOTATION __attribute__((used, section("__DATA,__crash_info")))
#define CRASH_VERSION 4
extern "C" crash_info_t gCRAnnotations CRASH_ANNOTATION = { CRASH_VERSION };
#endif
void AbortWithMessage(const char* msg)
{
#ifdef __APPLE__
gCRAnnotations.message = reinterpret_cast<size_t>(msg);
// Some macOS's seem to have issues displaying non-static `message`s, so throw it in here too
gCRAnnotations.backtrace = gCRAnnotations.message;
#endif
abort();
}
#ifndef __APPLE__
// MacOS version is in DarwinMisc
static CPUInfo CalcCPUInfo()
{
CPUInfo out;
out.name = cpuinfo_get_package(0)->name;
out.num_threads = cpuinfo_get_processors_count();
out.num_clusters = cpuinfo_get_clusters_count();
out.num_big_cores = 0;
out.num_small_cores = 0;
const cpuinfo_cluster* clusters = cpuinfo_get_clusters();
uint64_t big_freq = 0;
for (uint32_t i = 0; i < out.num_clusters; i++)
{
const cpuinfo_cluster& cluster = clusters[i];
if (cluster.frequency > big_freq)
{
out.num_small_cores += out.num_big_cores;
out.num_big_cores = cluster.core_count;
big_freq = cluster.frequency;
}
else if (cluster.frequency == big_freq)
{
out.num_big_cores += cluster.core_count;
}
else
{
out.num_small_cores += cluster.core_count;
}
}
return out;
}
const CPUInfo& GetCPUInfo()
{
static const CPUInfo info = CalcCPUInfo();
return info;
}
#endif
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