1 files changed, 93 insertions, 0 deletions
diff --git a/src/core/ngx_cpuinfo.c b/src/core/ngx_cpuinfo.c
new file mode 100644
index 000000000..a939635f8
--- /dev/null
+++ b/src/core/ngx_cpuinfo.c
@@ -0,0 +1,93 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#if (( __i386__ || __amd64__ ) && ( __GNUC__ || __INTEL_COMPILER ))
+
+
+static ngx_inline void ngx_cpuid(uint32_t i, uint32_t *buf);
+
+
+static ngx_inline void
+ngx_cpuid(uint32_t i, uint32_t *buf)
+{
+    uint32_t  eax, ebx, ecx, edx;
+
+    __asm__ (
+
+        "cpuid"
+
+    : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (i) );
+
+    buf[0] = eax;
+    buf[1] = ebx;
+    buf[2] = edx;
+    buf[3] = ecx;
+}
+
+
+/* auto detect the L2 cache line size of modern and widespread CPUs */
+
+void
+ngx_cpuinfo(void)
+{
+    u_char    *vendor;
+    uint32_t   vbuf[5], cpu[4];
+
+    vbuf[0] = 0;
+    vbuf[1] = 0;
+    vbuf[2] = 0;
+    vbuf[3] = 0;
+    vbuf[4] = 0;
+
+    ngx_cpuid(0, vbuf);
+
+    vendor = (u_char *) &vbuf[1];
+
+    if (vbuf[0] == 0) {
+        return;
+    }
+
+    ngx_cpuid(1, cpu);
+
+    if (ngx_strcmp(vendor, "GenuineIntel") == 0) {
+
+        switch (cpu[0] & 0xf00) {
+
+        /* Pentium */
+        case 5:
+        /* Pentium Pro, II, III */
+        case 6:
+            ngx_cacheline_size = 32;
+            break;
+
+        /*
+         * Pentium 4, although its cache line size is 64 bytes,
+         * it prefetches up to two cache lines during memory read
+         */
+        case 15:
+            ngx_cacheline_size = 128;
+            break;
+        }
+
+    } else if (ngx_strcmp(vendor, "AuthenticAMD") == 0) {
+        ngx_cacheline_size = 64;
+    }
+}
+
+#else
+
+
+void
+ngx_cpuinfo(void)
+{
+}
+
+
+#endif