1 files changed, 115 insertions, 0 deletions
diff --git a/firmware/lib/include/utility.h b/firmware/lib/include/utility.h
new file mode 100644
index 00000000..f6575ed5
--- /dev/null
+++ b/firmware/lib/include/utility.h
@@ -0,0 +1,115 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/*
+ * Helper functions/wrappers for memory allocations, manipulation and
+ * comparison.
+ */
+
+#ifndef VBOOT_REFERENCE_UTILITY_H_
+#define VBOOT_REFERENCE_UTILITY_H_
+
+#include "sysincludes.h"
+
+/* Debug and error output */
+#ifdef VBOOT_DEBUG
+#define VBDEBUG(params) VbExDebug params
+#else
+#define VBDEBUG(params)
+#endif
+
+#ifdef VBOOT_DEBUG
+#define VbAssert(expr) do { if (!(expr)) { \
+    VbExError("assert fail: %s at %s:%d\n", \
+              #expr, __FILE__, __LINE__); }} while(0)
+#else
+#define VbAssert(expr)
+#endif
+
+/* Optional, up to the BIOS */
+#ifdef VBOOT_EASTER_EGG
+#define VBEASTEREGG VbExEasterEgg()
+#else
+#define VBEASTEREGG 0
+#endif
+
+/*
+ * Combine [msw] and [lsw] uint16s to a uint32_t with its [msw] and [lsw]
+ * forming the most and least signficant 16-bit words.
+ */
+#define CombineUint16Pair(msw,lsw) (((uint32_t)(msw) << 16) |   \
+                                    (((lsw)) & 0xFFFF))
+
+/* Return the minimum of (a) or (b). */
+#define Min(a, b) (((a) < (b)) ? (a) : (b))
+
+/**
+ * Compare [n] bytes in [src1] and [src2].
+ *
+ * Returns an integer less than, equal to, or greater than zero if the first
+ * [n] bytes of [src1] is found, respectively, to be less than, to match, or be
+ * greater than the first n bytes of [src2]. */
+int Memcmp(const void *src1, const void *src2, size_t n);
+
+/**
+ * Copy [n] bytes from [src] to [dest].
+ */
+void *Memcpy(void *dest, const void *src, uint64_t n);
+
+/*
+ * Implementations of the functions below must be built as part of the firmware
+ * and defined in lib/utility.c.
+ */
+
+/**
+ * Set [n] bytes starting at [s] to [c].  Returns dest.
+ */
+void *Memset(void *dest, const uint8_t c, uint64_t n);
+
+/**
+ * Compare [n] bytes starting at [s1] with [s2] and return 0 if they
+ * match, 1 if they don't.  Returns 0 if n=0, since no bytes mismatched.
+ *
+ * Time taken to perform the comparison is only dependent on [n] and
+ * not on the relationship of the match between [s1] and [s2].
+ *
+ * Note that unlike Memcmp(), this only indicates inequality, not
+ * whether s1 is less than or greater than s2.
+ */
+int SafeMemcmp(const void *s1, const void *s2, size_t n);
+
+/*
+ * Buffer size required to hold the longest possible output of Uint64ToString()
+ * - that is, Uint64ToString(~0, 2).
+ */
+#define UINT64_TO_STRING_MAX 65
+
+/**
+ * Convert a value to a string in the specified radix (2=binary, 10=decimal,
+ * 16=hex) and store it in <buf>, which is <bufsize> chars long.  If
+ * <zero_pad_width>, left-pads the string to at least that width with '0'.
+ * Returns the length of the stored string, not counting the terminating null.
+ */
+uint32_t Uint64ToString(char *buf, uint32_t bufsize, uint64_t value,
+                        uint32_t radix, uint32_t zero_pad_width);
+
+/**
+ * Concatenate <src> onto <dest>, which has space for <destlen> characters
+ * including the terminating null.  Note that <dest> will always be
+ * null-terminated if <destlen> > 0.  Returns the number of characters used in
+ * <dest>, not counting the terminating null.
+ */
+uint32_t StrnAppend(char *dest, const char *src, uint32_t destlen);
+
+/* Ensure that only our stub implementations are used, not standard C */
+#ifndef _STUB_IMPLEMENTATION_
+#define malloc _do_not_use_standard_malloc
+#define free _do_not_use_standard_free
+#define memcmp _do_not_use_standard_memcmp
+#define memcpy _do_not_use_standard_memcpy
+#define memset _do_not_use_standard_memset
+#endif
+
+#endif  /* VBOOT_REFERENCE_UTILITY_H_ */