- How did I forget to cvs add this?

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1763 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

diff --git a/src/include/arch-generic/div64.h b/src/include/arch-generic/div64.h
new file mode 100644 (file)
index 0000000..a6bc975
--- /dev/null
+++ b/src/include/arch-generic/div64.h
@@ -0,0 +1,59 @@
+#ifndef ARCH_GENERIC_DIV64_H
+#define ARCH_GENERIC_DIV64_H
+/*
+ * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
+ * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h
+ *
+ * The semantics of do_div() are:
+ *
+ * uint32_t do_div(uint64_t *n, uint32_t base)
+ * {
+ *     uint32_t remainder = *n % base;
+ *     *n = *n / base;
+ *     return remainder;
+ * }
+ *
+ * NOTE: macro parameter n is evaluated multiple times,
+ *       beware of side effects!
+ */
+
+#include <limits.h>
+#include <stdint.h>
+
+#if ULONG_MAX == 4294967295
+
+extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
+
+/* The unnecessary pointer compare is there
+ * to check for type safety (n must be 64bit)
+ */
+# define do_div(n,base) ({                             \
+       uint32_t __base = (base);                       \
+       uint32_t __rem;                                 \
+       (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
+       if (likely(((n) >> 32) == 0)) {                 \
+               __rem = (uint32_t)(n) % __base;         \
+               (n) = (uint32_t)(n) / __base;           \
+       } else                                          \
+               __rem = __div64_32(&(n), __base);       \
+       __rem;                                          \
+ })
+
+#elif ULONG_MAX == 18446744073709551615
+
+# define do_div(n,base) ({                                     \
+       uint32_t __base = (base);                               \
+       uint32_t __rem;                                         \
+       __rem = ((uint64_t)(n)) % __base;                       \
+       (n) = ((uint64_t)(n)) / __base;                         \
+       __rem;                                                  \
+ })
+
+
+#else /* BITS_PER_LONG == ?? */
+
+# error do_div() does not yet support the C64
+
+#endif /* BITS_PER_LONG */
+
+#endif /* ARCH_GENERIC_DIV64_H */