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Smaller crc for the boot loader.

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Save 7k of text space by using simpler crc32 for standalone case. we
don't need all that fancy optimization in the boot loader, so use a
simplified version of the CRC function. We could save more by doing it
one bit at a time rather than 32, but this is the biggest savings at
the smallest performance hit.

With LUA and verfied exec, gptboot, gptzfsboot and friends are pushing
the ~530k limit and every little bit helps.

Reviewed By: allanjude
Differential Revision: https://reviews.freebsd.org/D24225
This commit is contained in:
Warner Losh 2020-09-01 04:37:55 +00:00
parent 3ae3a7a7c0
commit cffca129a9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=365022
1 changed files with 8 additions and 0 deletions
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8
sys/libkern/gsb_crc32.c
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@ -227,6 +227,7 @@ singletable_crc32c(uint32_t crc, const void *buf, size_t size)
return crc;
}
#ifndef _STANDALONE
/*
* Copyright (c) 2004-2006 Intel Corporation - All Rights Reserved
@ -788,3 +789,10 @@ calculate_crc32c(uint32_t crc32c,
return (multitable_crc32c(crc32c, buffer, length));
}
}
#else
uint32_t
calculate_crc32c(uint32_t crc32c, const unsigned char *buffer, unsigned int length)
{
return (singletable_crc32c(crc32c, buffer, length));
}
#endif