Merge zizzer:/bk/m5 into zeep.eecs.umich.edu:/z/saidi/work/m5-smp

--HG--
extra : convert_revision : 19dc01e1c0d2c0ba6b4d804b902429fb0a6a5552

1 files changed, 117 insertions, 0 deletions

diff --git a/base/crc.cc b/base/crc.cc
new file mode 100644
index 000000000..8bff4b868
--- /dev/null
+++ b/base/crc.cc
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+/* $Id$ */
+
+/*
+ * Copyright (c) 1988, 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sstream>
+#include <string>
+
+#include "sim/host.hh"
+#include "base/crc.hh"
+
+#define ETHER_CRC_POLY_LE 0xedb88320
+#define ETHER_CRC_POLY_BE 0x04c11db6
+
+#if 0
+/*
+ * This is for reference.  We have a table-driven version
+ * of the little-endian crc32 generator, which is faster
+ * than the double-loop.
+ */
+uint32_t
+crc32le(const uint8_t *buf, size_t len)
+{
+    uint32_t c, crc, carry;
+    size_t i, j;
+
+    crc = 0xffffffffU;      /* initial value */
+
+    for (i = 0; i < len; i++) {
+        c = buf[i];
+        for (j = 0; j < 8; j++) {
+            carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
+            crc >>= 1;
+            c >>= 1;
+            if (carry)
+                crc = (crc ^ ETHER_CRC_POLY_LE);
+        }
+    }
+
+    return (crc);
+}
+#else
+uint32_t
+crc32le(const uint8_t *buf, size_t len)
+{
+    static const uint32_t crctab[] = {
+        0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+        0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+        0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+        0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+    };
+    uint32_t crc;
+    int i;
+
+    crc = 0xffffffffU;      /* initial value */
+
+    for (i = 0; i < len; i++) {
+        crc ^= buf[i];
+        crc = (crc >> 4) ^ crctab[crc & 0xf];
+        crc = (crc >> 4) ^ crctab[crc & 0xf];
+    }
+
+    return (crc);
+}
+#endif
+
+uint32_t
+crc32be(const uint8_t *buf, size_t len)
+{
+    uint32_t c, crc, carry;
+    size_t i, j;
+
+    crc = 0xffffffffU;      /* initial value */
+
+    for (i = 0; i < len; i++) {
+        c = buf[i];
+        for (j = 0; j < 8; j++) {
+            carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
+            crc <<= 1;
+            c >>= 1;
+            if (carry)
+                crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
+        }
+    }
+
+    return (crc);
+}