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clean up slightly, do a little #define trick to make checksumming 

the boot block a little easier/more 'clean', and provide a macro to
checksum the boot block.
This commit is contained in:
cgd 1999-04-05 02:45:47 +00:00
parent 47acef4796
commit 7a2f0695dd
1 changed files with 23 additions and 6 deletions
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29
sys/arch/alpha/include/disklabel.h
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@ -1,4 +1,4 @@
/* $NetBSD: disklabel.h,v 1.4 1999/04/02 07:32:33 cgd Exp $ */
/* $NetBSD: disklabel.h,v 1.5 1999/04/05 02:45:47 cgd Exp $ */
/*
* Copyright (c) 1994, 1999 Christopher G. Demetriou
@ -52,15 +52,32 @@ struct cpu_disklabel {
*/
struct boot_block {
u_int64_t bb_pad[60]; /* disklabel lives in here */
u_int64_t bb_secsize; /* secondary size (blocks) */
u_int64_t bb_secstart; /* secondary start (blocks) */
u_int64_t bb_flags; /* unknown; always zero */
u_int64_t bb_data[63]; /* data (disklabel, also as below) */
u_int64_t bb_cksum; /* checksum of the the boot block,
* taken as u_int64_t's
*/
};
#define bb_secsize bb_data[60] /* secondary size (blocks) */
#define bb_secstart bb_data[61] /* secondary start (blocks) */
#define bb_flags bb_data[62] /* unknown flags (set to zero) */
#define BOOT_BLOCK_BLOCKSIZE 512 /* block size for sec. size/start */
#define BOOT_BLOCK_OFFSET 0 /* offset of boot block. */
#define BOOT_BLOCK_BLOCKSIZE 512 /* block size for sec. size/start,
* and for boot block itself
*/
#define CHECKSUM_BOOT_BLOCK(bb,cksum) \
do { \
const struct boot_block *_bb = (bb); \
u_int64_t _cksum; \
int _i; \
\
_cksum = 0; \
for (_i = 0; \
_i < (sizeof _bb->bb_data / sizeof _bb->bb_data[0]); \
_i++) \
_cksum += _bb->bb_data[_i]; \
*(cksum) = _cksum; \
} while (0)
#endif /* _MACHINE_DISKLABEL_H_ */