From 44dbb6e5e4160ff8663df9f176bb6313cabb8ad1 Mon Sep 17 00:00:00 2001
From: Francis Rowe <info@gluglug.org.uk>
Date: Tue, 23 Dec 2014 21:20:47 -0500
Subject: ich9deblob: add define for 0xBABA gbe checksum and use it

---
(limited to 'resources/utilities/ich9deblob')

diff --git a/resources/utilities/ich9deblob/gbe/gbe.c b/resources/utilities/ich9deblob/gbe/gbe.c
index 3caa3ee..417f37b 100644
--- a/resources/utilities/ich9deblob/gbe/gbe.c
+++ b/resources/utilities/ich9deblob/gbe/gbe.c
@@ -86,7 +86,7 @@ struct GBEREGIONRECORD_8K deblobbedGbeStructFromFactory(struct GBEREGIONRECORD_8
 	struct GBEREGIONRECORD_8K deblobbedGbeStruct8k;
 	memcpy(&deblobbedGbeStruct8k, &factoryGbeStruct8k, GBEREGIONSIZE_8K);
 	
-	deblobbedGbeStruct8k.backup.checkSum = gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, 0xBABA);
+	deblobbedGbeStruct8k.backup.checkSum = gbeGetChecksumFrom4kStruct(deblobbedGbeStruct8k.backup, GBECHECKSUMTOTAL);
 	memcpy(&deblobbedGbeStruct8k.main, &deblobbedGbeStruct8k.backup, GBEREGIONSIZE_4K);
 	
 	return deblobbedGbeStruct8k;
@@ -108,7 +108,7 @@ void printGbeChecksumDataFromStruct4k(struct GBEREGIONRECORD_4K gbeStruct4k, cha
 		"%s Gbe (%s): calculated Gbe checksum: 0x%hx and actual GBe checksum: 0x%hx\n", 
 		romName,
 		regionName,
-		gbeGetChecksumFrom4kStruct(gbeStruct4k, 0xBABA), 
+		gbeGetChecksumFrom4kStruct(gbeStruct4k, GBECHECKSUMTOTAL), 
 		gbeStruct4k.checkSum
 	);
 }
diff --git a/resources/utilities/ich9deblob/gbe/gbe.h b/resources/utilities/ich9deblob/gbe/gbe.h
index 17d6a93..27ad4d7 100644
--- a/resources/utilities/ich9deblob/gbe/gbe.h
+++ b/resources/utilities/ich9deblob/gbe/gbe.h
@@ -43,6 +43,13 @@
  */
 #define GBEREGIONSIZE_4K 0x1000
 
+/* 
+ * When adding up the first 0x3F 16-bit words
+ * in a 4KiB GBE region, it should be equal
+ * to 0xBABA
+ */
+#define GBECHECKSUMTOTAL 0xBABA
+
 /*
  * These will have a modified descriptor+gbe based on what's in the factory.rom
  * These will be joined into a single 12KiB buffer (descriptor, then gbe) and saved to a file
@@ -59,7 +66,7 @@
 struct GBEREGIONRECORD_4K {
 	unsigned char macAddress[6]; /* 0x03 words, or 0x06 bytes */
 	unsigned char otherStuff[120];  /* 0x3c words, or 0x7E bytes */
-	unsigned short checkSum; /* when added to the sum of all words above, this should be 0xBABA */
+	unsigned short checkSum; /* when added to the sum of all words above, this should match GBECHECKSUMTOTAL */
 	unsigned char padding1[3968];
 };
 
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