From 52e32b2c9f0e5ac7cfb31fd2306e6536340955e1 Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@suren.me>
Date: Tue, 17 Nov 2015 18:23:48 +0100
Subject: Support for 64-bit registes

---
 pcilib/cpu.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 pcilib/cpu.c

(limited to 'pcilib/cpu.c')

diff --git a/pcilib/cpu.c b/pcilib/cpu.c
new file mode 100644
index 0000000..7fc86f5
--- /dev/null
+++ b/pcilib/cpu.c
@@ -0,0 +1,115 @@
+#define _POSIX_C_SOURCE 200112L
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <assert.h>
+#include <ctype.h>
+#include <time.h>
+#include <sched.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+
+#include "pci.h"
+#include "tools.h"
+#include "error.h"
+
+static void pcilib_run_cpuid(uint32_t eax, uint32_t ecx, uint32_t* abcd) {
+    uint32_t ebx = 0, edx;
+# if defined( __i386__ ) && defined ( __PIC__ )
+     /* in case of PIC under 32-bit EBX cannot be clobbered */
+    __asm__ ( "movl %%ebx, %%edi \n\t cpuid \n\t xchgl %%ebx, %%edi" : "=D" (ebx),
+# else
+    __asm__ ( "cpuid" : "+b" (ebx),
+# endif
+              "+a" (eax), "+c" (ecx), "=d" (edx) );
+    abcd[0] = eax; abcd[1] = ebx; abcd[2] = ecx; abcd[3] = edx;
+}
+
+static int pcilib_check_xcr0_ymm() {
+    uint32_t xcr0;
+    __asm__ ("xgetbv" : "=a" (xcr0) : "c" (0) : "%edx" );
+    return ((xcr0 & 6) == 6); /* checking if xmm and ymm state are enabled in XCR0 */
+}
+
+static int pcilib_check_4th_gen_intel_core_features() {
+    uint32_t abcd[4];
+    uint32_t fma_movbe_osxsave_mask = ((1 << 12) | (1 << 22) | (1 << 27));
+    uint32_t avx2_bmi12_mask = (1 << 5) | (1 << 3) | (1 << 8);
+
+    /* CPUID.(EAX=01H, ECX=0H):ECX.FMA[bit 12]==1   && 
+       CPUID.(EAX=01H, ECX=0H):ECX.MOVBE[bit 22]==1 && 
+       CPUID.(EAX=01H, ECX=0H):ECX.OSXSAVE[bit 27]==1 */
+    pcilib_run_cpuid( 1, 0, abcd );
+    if ( (abcd[2] & fma_movbe_osxsave_mask) != fma_movbe_osxsave_mask ) 
+        return 0;
+
+    if ( ! pcilib_check_xcr0_ymm() )
+        return 0;
+
+    /*  CPUID.(EAX=07H, ECX=0H):EBX.AVX2[bit 5]==1  &&
+        CPUID.(EAX=07H, ECX=0H):EBX.BMI1[bit 3]==1  &&
+        CPUID.(EAX=07H, ECX=0H):EBX.BMI2[bit 8]==1  */
+    pcilib_run_cpuid( 7, 0, abcd );
+    if ( (abcd[1] & avx2_bmi12_mask) != avx2_bmi12_mask ) 
+        return 0;
+
+    /* CPUID.(EAX=80000001H):ECX.LZCNT[bit 5]==1 */
+    pcilib_run_cpuid( 0x80000001, 0, abcd );
+    if ( (abcd[2] & (1 << 5)) == 0)
+        return 0;
+
+    return 1;
+}
+
+static int pcilib_detect_cpu_gen() {
+    if (pcilib_check_4th_gen_intel_core_features())
+	return 4;
+    return 0;
+}
+
+int pcilib_get_cpu_gen() {
+    int gen = -1;
+
+    if (gen < 0 )
+        gen = pcilib_detect_cpu_gen();
+
+    return gen;
+}
+
+int pcilib_get_page_mask() {
+    int pagesize,pagemask,temp;
+
+    pagesize = sysconf(_SC_PAGESIZE);
+
+    for( pagemask=0, temp = pagesize; temp != 1; ) {
+	temp = (temp >> 1);
+	pagemask = (pagemask << 1)+1;
+    }
+    return pagemask;
+}
+
+int pcilib_get_cpu_count() {
+    int err;
+
+    int cpu_count;
+    cpu_set_t mask;
+
+    err = sched_getaffinity(getpid(), sizeof(mask), &mask);
+    if (err) return 1;
+
+#ifdef CPU_COUNT
+    cpu_count = CPU_COUNT(&mask);
+#else
+    for (cpu_count = 0; cpu_count < CPU_SETSIZE; cpu_count++) {
+	if (!CPU_ISSET(cpu_count, &mask)) break;
+    }
+#endif
+
+    if (!cpu_count) cpu_count = PCILIB_DEFAULT_CPU_COUNT;
+    return cpu_count;    
+}
+
-- 
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