From 1f8ead65730a2ed3f7fa721ec48dbf20de02cca7 Mon Sep 17 00:00:00 2001
From: Ilya Orlov <iorlov@rzn.dlink.ru>
Date: Thu, 24 May 2018 12:49:20 +0300
Subject: [PATCH] xrCore: detect cpuid feature from q4a

---
 src/xrCore/cpuid.cpp | 55 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 6 deletions(-)

diff --git a/src/xrCore/cpuid.cpp b/src/xrCore/cpuid.cpp
index 93333c8942f..c371ea5c927 100644
--- a/src/xrCore/cpuid.cpp
+++ b/src/xrCore/cpuid.cpp
@@ -19,7 +19,34 @@ unsgined int query_processor_info(processor_info* pinfo)
 
 #undef _CPUID_DEBUG
 
-#if defined(WINDOWS)
+void nativeCpuId(int regs[4], int i)
+{
+#ifdef WINDOWS
+    __cpuid((int *)regs, (int)i);
+#elif defined(LINUX) && defined(GCC)
+    __cpuid((int)i, (int *)regs);
+#elif defined(LINUX)
+    asm volatile("cpuid" :
+    "=eax" (regs[0]),
+    "=ebx" (regs[1]),
+    "=ecx" (regs[2]),
+    "=edx" (regs[3])
+    : "eax" (i));
+#else
+#error Cpuid is not implemented
+#endif
+}
+
+#ifndef WINDOWS
+#include <thread>
+
+void __cpuidex(int regs[4], int i, int j)
+{
+    nativeCpuId(regs, i);
+}
+#endif
+
+#ifdef WINDOWS
 DWORD countSetBits(ULONG_PTR bitMask)
 {
     DWORD LSHIFT = sizeof(ULONG_PTR) * 8 - 1;
@@ -41,7 +68,6 @@ unsigned int query_processor_info(processor_info* pinfo)
 {
     ZeroMemory(pinfo, sizeof(processor_info));
 
-#if defined(WINDOWS)
     std::bitset<32> f_1_ECX;
     std::bitset<32> f_1_EDX;
     /*std::bitset<32> f_7_EBX;
@@ -52,7 +78,7 @@ unsigned int query_processor_info(processor_info* pinfo)
     xr_vector<std::array<int, 4>> data;
     std::array<int, 4> cpui;
 
-    __cpuid(cpui.data(), 0);
+    nativeCpuId(cpui.data(), 0);
     const int nIds = cpui[0];
 
     for (int i = 0; i <= nIds; ++i)
@@ -83,7 +109,7 @@ unsigned int query_processor_info(processor_info* pinfo)
     f_7_ECX = data[7][2];
     }*/
 
-    __cpuid(cpui.data(), 0x80000000);
+    nativeCpuId(cpui.data(), 0x80000000);
     const int nExIds_ = cpui[0];
     data.clear();
 
@@ -120,7 +146,7 @@ unsigned int query_processor_info(processor_info* pinfo)
     if (f_1_ECX[19]) pinfo->features |= static_cast<u32>(CpuFeature::Sse41);
     if (f_1_ECX[20]) pinfo->features |= static_cast<u32>(CpuFeature::Sse42);
 
-    __cpuid(cpui.data(), 1);
+    nativeCpuId(cpui.data(), 1);
 
     const bool hasMWait = (cpui[2] & 0x8) > 0;
     if (hasMWait) pinfo->features |= static_cast<u32>(CpuFeature::MWait);
@@ -130,9 +156,21 @@ unsigned int query_processor_info(processor_info* pinfo)
     pinfo->stepping = cpui[0] & 0xf;
 
     // Calculate available processors
+#ifdef WINDOWS
     ULONG_PTR pa_mask_save, sa_mask_stub = 0;
     GetProcessAffinityMask(GetCurrentProcess(), &pa_mask_save, &sa_mask_stub);
+#elif defined(LINUX)
+    unsigned int pa_mask_save = 0;
+    cpu_set_t my_set;
+    CPU_ZERO(&my_set);
+    sched_getaffinity(0, sizeof(cpu_set_t), &my_set);
+    pa_mask_save = CPU_COUNT(&my_set);
+#else
+#warning "No Function to obtain process affinity"
+    unsigned int pa_mask_save = 0;
+#endif // WINDOWS
 
+#ifdef WINDOWS
     DWORD returnedLength = 0;
     DWORD byteOffset = 0;
     GetLogicalProcessorInformation(nullptr, &returnedLength);
@@ -162,6 +200,12 @@ unsigned int query_processor_info(processor_info* pinfo)
         byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
         ptr++;
     }
+#elif defined(LINUX)
+    int logicalProcessorCount = std::thread::hardware_concurrency();
+
+    int processorCoreCount = sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+
 
     if (logicalProcessorCount != processorCoreCount) pinfo->features |= static_cast<u32>(CpuFeature::HT);
 
@@ -169,7 +213,6 @@ unsigned int query_processor_info(processor_info* pinfo)
     pinfo->n_threads = logicalProcessorCount;
     pinfo->affinity_mask = pa_mask_save;
     pinfo->n_cores = processorCoreCount;
-#endif
 
     return pinfo->features;
 }