src-test/sys/dev/mc146818, branch main

SPDX: Consider code from Carnegie-Mellon University.

2017-11-30T15:48:35Z

Interesting cases, most likely from CMU Mach sources.

sys/dev: further adoption of SPDX licensing ID tags.

2017-11-27T14:52:40Z

Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.

Use FreeBSD-bit-checking-style

2014-10-10T14:17:42Z

This appease gcc 4.9 issuing warnings about parentheses Differential Revision: https://reviews.freebsd.org/D933 Reviewed by: marius

Remove clause 3 from Izumi Tsutsui's licenses.

2009-12-25T22:58:43Z

Obtained from: NetBSD

Style changes

2009-12-25T22:53:46Z

Obtained from: NetBSD (mc146818reg.h)

Export mc146818_def_{read,write}() so the front-end can make use

2007-06-16T23:10:00Z

of them if needed.

Add macros for the individual divisor bits as some MC146818A-compatible

2007-01-20T14:57:51Z

chips also use them for different purposes.

After some input from bde@ and rereading the datasheet use a MTX_SPIN

2005-06-04T23:24:50Z

mutex instead of a MTX_DEF one in order to defer preemption while reading the date and time registers. If we don't manage to read them within the time slot where we are guaranteed that no updates occur we might actually read them during an update in which case the output is undefined.

o mc146818(4):

2005-05-19T21:20:42Z

- Add locking. - Account for if the MC146818_NO_CENT_ADJUST flag is set we don't need to check wheter year < POSIX_BASE_YEAR. - Add some comments about mapping the day of week from the range the generic clock code uses to the range the chip uses and which I meant to add in the initial version. - Minor clean-up, use __func__ instead of hardcoded function names in error strings. o in the rtc(4) front-end additionally: - Don't leak resources in case mc146818_attach() fails. - Account for ebus(4) defaulting to SYS_RES_MEMORY for the memory resources since ebus.c rev. 1.22.

Start each of the license/copyright comments with /*-, minor shuffle of lines

2005-01-06T01:43:34Z