+
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
+{
+ if(dev->chunkShift){
+ /* Easy-peasy power of 2 case */
+ *chunk = (__u32)(addr >> dev->chunkShift);
+ *offset = (__u32)(addr & dev->chunkMask);
+ }
+ else if(dev->crumbsPerChunk)
+ {
+ /* Case where we're using "crumbs" */
+ *offset = (__u32)(addr & dev->crumbMask);
+ addr >>= dev->crumbShift;
+ *chunk = ((__u32)addr)/dev->crumbsPerChunk;
+ *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
+ }
+ else
+ YBUG();
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or equal
+ * to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static __u32 ShiftsGE(__u32 x)
+{
+ int extraBits;
+ int nShifts;
+
+ nShifts = extraBits = 0;
+
+ while(x>1){
+ if(x & 1) extraBits++;
+ x>>=1;
+ nShifts++;
+ }
+
+ if(extraBits)
+ nShifts++;
+
+ return nShifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static __u32 ShiftDiv(__u32 x)
+{
+ int nShifts;
+
+ nShifts = 0;
+
+ if(!x) return 0;
+
+ while( !(x&1)){
+ x>>=1;
+ nShifts++;
+ }
+
+ return nShifts;
+}
+
+
+