X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=blobdiff_plain;f=src%2F5gnrmac%2Flwr_mac_util.c;h=0fd3358befb12862b5b982bd9b6f363f32b936db;hb=df97420828852456256f46cfb7b921c12bd9285e;hp=9e18003d6fc63b3bd38ec395e7af9eb89e0f6207;hpb=0a26c487f1b6bbb5217e47b15fa8273b2e749283;p=o-du%2Fl2.git

diff --git a/src/5gnrmac/lwr_mac_util.c b/src/5gnrmac/lwr_mac_util.c
index 9e18003d6..0fd3358be 100644
--- a/src/5gnrmac/lwr_mac_util.c
+++ b/src/5gnrmac/lwr_mac_util.c
@@ -46,7 +46,7 @@ LwrMacCellCb * lwrMacGetCellCb
 
    if(cellId >= MAX_NUM_CELL)
    {
-      printf("\n Invalid Cell Id [%d]. rgClUtlGetCellCb failed.", cellId);
+      DU_LOG("\nERROR  -->  Invalid Cell Id [%d]. rgClUtlGetCellCb failed.", cellId);
       return NULLP;
    }
    
@@ -74,11 +74,11 @@ LwrMacCellCb * lwrMacGetCellCb
 uint32_t reverseBits(uint32_t num, uint8_t numBits)
 {
    uint32_t reverse_num = 0;
-   int i;
-   for (i = 0; i < numBits; i++)
+   uint8_t bitIdx;
+   for (bitIdx = 0; bitIdx < numBits; bitIdx++)
    {
-      if((num & (1 << i)))
-	 reverse_num |= 1 << ((numBits - 1) - i);
+      if((num & (1 << bitIdx)))
+	 reverse_num |= 1 << ((numBits - 1) - bitIdx);
    }
    return reverse_num;
 }
@@ -135,7 +135,58 @@ void fillDlDciPayload(uint8_t *buf, uint8_t *bytePos, uint8_t *bitPos,\
    }
 }
 
+/*
+ * As per FAPI spec, 
+ * Frequency domain resources is a bitmap defining non-overlapping groups of 6 PRBs in ascending order.
+ * [TS38.213 10.1]. Bitmap of uint8 array. 45 bits.
+ *
+ * As per IAPI,
+ * CORESET-freqdom.frequencyDomainResources : The bits of the bitmap have a one-to-one mapping with
+ * non-overlapping groups of 6 RBs. The most significant bit of the first word corresponds to
+ * the most significant bit defined in 38.331.
+ *
+ * FAPI and IAPI both are 45 bits. Mapped from bit 0 LS Byte for the FAPI and
+ * bit 0 LS U32 entry for IAPI.
+ * FAPI is to be filled in following format such that Intel L1 is able to decode it :
+ *
+ *            FAPI                                 IAPI 
+ * FreqDomainResource[0] bits 7-0     ->    nFreqDomain[0] bits 7-0
+ * FreqDomainResource[1] bits 7-0     ->    nFreqDomain[0] bits 15-8
+ * FreqDomainResource[2] bits 7-0     ->    nFreqDomain[0] bits 23-16
+ * FreqDomainResource[3] bits 7-0     ->    nFreqDomain[0] bits 31-24
+ * FreqDomainResource[4] bits 7-0     ->    nFreqDomain[1] bits 7-0
+ * FreqDomainResource[5] bits 7-0     ->    nFreqDomain[1] bits 15-8
+ *
+ * where for the last entry bits 7,6 and 5 are don't care in the FAPI and bits
+ * 31-13 are don't care in the IAPI.
+ */
+void convertFreqDomRsrcMapToIAPIFormat(uint8_t *sourceBitMap, uint8_t *destBitMap)
+{
+   int8_t  idx;
+   uint8_t  numBitsToShift = 0;
+   uint64_t freqDomainResources = 0;
+
+   /* Bit operation to create a 64-bit integer that has
+    * 48 LSBs [Bit 47 to Bit 0] mapped to sourceBitMap[0] to sourceBitMap[5]
+    */
+   for(idx = FREQ_DOM_RSRC_SIZE-1; idx >=0; idx--)
+   {
+      freqDomainResources |= ((uint64_t)sourceBitMap[idx] << numBitsToShift);
+      numBitsToShift += 8;
+   }
+
+   /* Right shift 3 bits because bits[2-0] are unused in sourceBitMap[5] */
+   freqDomainResources = freqDomainResources >> 3;
 
+   /* Filling destBitMap such that LSB bit 0 of freqDomainResources maps to LSB 
+    * of first word of destBitMap */
+   numBitsToShift = 0;
+   for(idx=0; idx<FREQ_DOM_RSRC_SIZE; idx++)
+   {
+      destBitMap[idx] = freqDomainResources >> numBitsToShift;
+      numBitsToShift += 8;
+   }
+}
 
 /**********************************************************************
   End of file