1. Fix bugs for PXE-IPv6 to accommodate the situation:

[mirror_edk2.git] / NetworkPkg / UefiPxeBcDxe / PxeBcSupport.c

diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c b/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
index 30418c3b6a1c2d83483c738c511fbc361d6799fe..6ddcac718ed93b71737ac7e02f9b5965f2e10ec5 100644 (file)
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcSupport.c
@@ -1464,3 +1464,56 @@ PxeBcUniHexToUint8 (
 \r
   return EFI_INVALID_PARAMETER;\r
 }\r
+\r
+/**\r
+  Calculate the elapsed time\r
+\r
+  @param[in]      Private      The pointer to PXE private data\r
+\r
+**/\r
+VOID\r
+CalcElapsedTime (\r
+  IN     PXEBC_PRIVATE_DATA     *Private\r
+  )\r
+{\r
+  EFI_TIME          Time;\r
+  UINT64            CurrentStamp;\r
+  UINT64            ElapsedTimeValue;\r
+\r
+  //\r
+  // Generate a time stamp of the centiseconds from 1900/1/1, assume 30day/month.\r
+  //\r
+  ZeroMem (&Time, sizeof (EFI_TIME));\r
+  gRT->GetTime (&Time, NULL);\r
+  CurrentStamp = (UINT64)\r
+    (\r
+      ((((((Time.Year - 1900) * 360 +\r
+       (Time.Month - 1)) * 30 +\r
+       (Time.Day - 1)) * 24 + Time.Hour) * 60 +\r
+       Time.Minute) * 60 + Time.Second) * 100\r
+       + DivU64x32(Time.Nanosecond, 10000000)\r
+    );\r
+\r
+  //\r
+  // Sentinel value of 0 means that this is the first DHCP packet that we are\r
+  // sending and that we need to initialize the value.  First DHCP Solicit\r
+  // gets 0 elapsed-time.  Otherwise, calculate based on StartTime.\r
+  //\r
+  if (Private->ElapsedTime == 0) {\r
+    Private->ElapsedTime = CurrentStamp;\r
+  } else {\r
+    ElapsedTimeValue = CurrentStamp - Private->ElapsedTime;\r
+\r
+    //\r
+    // If elapsed time cannot fit in two bytes, set it to 0xffff.\r
+    //\r
+    if (ElapsedTimeValue > 0xffff) {\r
+      ElapsedTimeValue = 0xffff;\r
+    }\r
+    //\r
+    // Save the elapsed time\r
+    //\r
+    Private->ElapsedTime = ElapsedTimeValue;\r
+  }\r
+}\r
+\r