wireguard-openbsd/sys/arch/sh/include/cpu.h, branch jd/queueboosts

introduce "cpu_rnd_messybits" for use instead of nanotime in dev/rnd.c.

2020-05-31T06:23:56Z

rnd.c uses nanotime to get access to some bits that change quickly between events that it can mix into the entropy pool. it doesn't use nanotime to get a monotonically increasing set or ordered and accurate timestamps, it just wants something with bits that change. there's been discussions for years about letting rnd use a clock that's super fast to read, but not necessarily accurate, but it wasn't until recently that i figured out it wasn't interested in time at all, so things like keeping a fast clock coherent between cpu cores or correct according to ntp is unecessary. this means we can just let rnd read the cycle counters on cpus and things will be fine. cpus with cycle counters that vary in their speed and arent kept consistent between cores may even be desirable in this context. so this is the first step in converting rnd.c to reading cycle counter. it copies the nanotime backend to each arch, and they can replace it with something MD as a second step later on. djm@ suggested rnd_messybytes, but we landed on cpu_rnd_messybits. thanks to visa for his eyes. ok deraadt@ visa@ deraadt@ says he will help handle any MD fallout that occurs.

Add intr_{disable,restore}() for sh.

2019-03-24T06:09:09Z

Reminded by deraadt@

CPU_BUSY_CYCLE(): A new MI statement for busy loop power reduction

2014-07-11T10:53:07Z

The new CPU_BUSY_CYCLE() may be put in a busy loop body so that CPU can reduce power consumption, as Linux's cpu_relax() and FreeBSD's cpu_spinwait(). To start minimally, use PAUSE on i386/amd64 and empty on others. The name is chosen following the existing cpu_idle_*() functions. Naming and API may be polished later. OK kettenis@

final removal of daddr64_t. daddr_t has been 64 bit for a long enough

2013-06-11T16:42:02Z

test period; i think 3 years ago the last bugs fell out. ok otto beck others

Fix kernel profiling on MP systems by using per-CPU buffers and teach

2013-03-12T09:37:16Z

kgmon(8) to deal with them, this time without public header changes. Previously various CPUs were iterating over the same global buffer at the same time to modify it and never ended. This diff includes some ideas submited by Thor Simon to NetBSD via miod@. ok deraadt@, mikeb@, haesbaert@

Back out per-CPU kernel profiling, it shouldn't modify a public header

2013-02-12T08:06:22Z

at this moment.

Fix kernel profiling on MP systems by using per-CPU buffer. Previously

2013-02-11T17:05:25Z

various CPUs were iterating over the same global buffer at the same time to modify it and never ended. This diff includes some ideas submited by Thor Simon to NetBSD via miod@. ok mikeb@, haesbaert@

Determine whether we're currently on the alternative signal stack

2012-12-02T07:03:30Z

dynamically, by comparing the stack pointer against the altstack base and size, so that you get the correct answer if you longjmp out of the signal handler, as tested by regress/sys/kern/stackjmp/. Also, fix alt stack handling on vax, where it was completely broken. Testing and corrections by miod@, krw@, tobiasu@, pirofti@

Implement a per-cpu held mutex counter if DIAGNOSTIC on all non-x86 platforms,

2010-09-28T20:27:52Z

to complete matthew@'s commit of a few days ago, and drop __HAVE_CPU_MUTEX_LEVEL define. With help from, and ok deraadt@.

Do not include from , and fix which

2010-04-25T18:11:36Z

used to depend on bringing .