Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 48 insertions, 0 deletions

diff --git a/include/asm-arm/div64.h b/include/asm-arm/div64.h
new file mode 100644
index 000000000000..3682616804ca
--- /dev/null
+++ b/include/asm-arm/div64.h
@@ -0,0 +1,48 @@
+#ifndef __ASM_ARM_DIV64
+#define __ASM_ARM_DIV64
+
+#include <asm/system.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;
+ * }
+ *
+ * In other words, a 64-bit dividend with a 32-bit divisor producing
+ * a 64-bit result and a 32-bit remainder.  To accomplish this optimally
+ * we call a special __do_div64 helper with completely non standard
+ * calling convention for arguments and results (beware).
+ */
+
+#ifdef __ARMEB__
+#define __xh "r0"
+#define __xl "r1"
+#else
+#define __xl "r0"
+#define __xh "r1"
+#endif
+
+#define do_div(n,base)                                          \
+({                                                              \
+        register unsigned int __base      asm("r4") = base;     \
+        register unsigned long long __n   asm("r0") = n;        \
+        register unsigned long long __res asm("r2");            \
+        register unsigned int __rem       asm(__xh);            \
+        asm(    __asmeq("%0", __xh)                             \
+                __asmeq("%1", "r2")                             \
+                __asmeq("%2", "r0")                             \
+                __asmeq("%3", "r4")                             \
+                "bl     __do_div64"                             \
+                : "=r" (__rem), "=r" (__res)                    \
+                : "r" (__n), "r" (__base)                       \
+                : "ip", "lr", "cc");                            \
+        n = __res;                                              \
+        __rem;                                                  \
+})
+
+#endif