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coreboot/payloads/libpayload/libc
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Vadim Bendebury e1abf87d43 libpayload: improve us timer accuracy 
In cases where timer clock frequency is not an integer number of
megahertz, the calculations in timer_us() lack accuracy.

This patch modifies calculations to reduce the error. The maximum
interval this calculation would support decreases, but it still is in
excess of 1844674 seconds for a timer clocked by 10 MHz, which is more
than enough.

BUG=none
TEST=manual
  . verified timer accuracy using a depthcharge CLI command

Change-Id: Iffb323db10e74b0ce3b4d59a56983bfee12e6805
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/207358
Reviewed-by: David Hendricks <dhendrix@chromium.org>
2014-07-11 01:55:41 +00:00
..
args.c Since some people disapprove of white space cleanups mixed in regular commits 2010-04-27 06:56:47 +00:00
console.c libpayload: Add ability to unregister output driver 2014-06-11 03:30:51 +00:00
ctype.c fix typo in ctype.c 2008-08-19 16:53:47 +00:00
die.c libpayload: Fix the license in some files which were accidentally made GPL. 2014-01-11 01:36:57 +00:00
exec.c libpayload: Change CONFIG_* to CONFIG_LP_* in the kconfig. 2013-08-14 17:05:33 -07:00
getopt_long.c Reduce warnings/errors in libpayload when using picky compiler options 2011-06-30 20:41:23 +02:00
hexdump.c libpayload: Fix the license header on hexdump. 2014-01-15 23:36:36 +00:00
ipchecksum.c trivial fix: ipchksum takes an unspecified input blob, not explicitly a number of shorts. 2008-08-16 15:16:36 +00:00
lar.c Refactor the endianness conversion functions and header files. 2012-11-08 19:49:51 +01:00
lib.c libpayload: Provide dummy getenv() 2011-07-20 10:02:19 +02:00
Makefile.inc libpayload: Add a new "die" function to fatally signal programming errors. 2013-11-27 01:46:00 +00:00
malloc.c libpayload: Fix pointer related casts 2014-05-14 00:25:48 +00:00
memory.c libpayload: Reorder default memcpy, speed up memset and memcmp 2014-06-23 19:31:18 +00:00
printf.c libpayload: console: Allow output drivers to print whole strings at once 2014-04-30 10:00:35 +00:00
qsort.c libpayload: remove trailing whitespace and run dos2unix 2011-11-01 19:08:23 +01:00
rand.c Add rand/rand_r/srand functions for generating pseudo-random bytes. 2008-04-07 23:33:50 +00:00
readline.c Catch various cases in libpayload where malloc() or memalign() return NULL 2009-07-31 11:39:55 +00:00
string.c libpayload: Some more compatibility (for flashrom) 2011-08-17 16:26:20 +02:00
strings.c Reduce warnings/errors in libpayload when using picky compiler options 2011-06-30 20:41:23 +02:00
strlcpy.c libpayload: Implement strlcpy 2011-07-07 22:29:35 +02:00
sysinfo.c Reduce warnings/errors in libpayload when using picky compiler options 2011-06-30 20:41:23 +02:00
time.c libpayload: improve us timer accuracy 2014-07-11 01:55:41 +00:00