* ========== Copyright Header Begin ==========================================
* Hypervisor Software File: checksum.c
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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* or without modification, are permitted provided that the following
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* ========== Copyright Header End ============================================
* id: @(#)checksum.c 1.9 01/03/04
* purpose: Flash PROM Update Utility
* copyright: Copyright 1995-2001 Sun Microsystems, Inc. All Rights Reserved
checksum(uint16_t *addr
, int32_t count
)
* Compute Internet Checksum for "count" bytes beginning at
register uint32_t sum
= 0;
/* This is the inner loop */
/* Add left-over byte, if any */
sum
+= *(unsigned char *) addr
;
/* Fold 32-bit sum to 16 bits */
sum
= (sum
& 0xffff) + (sum
>> 16);