Unlock KERN_ALLOWKMEM. The `allowkmem' is atomically accessed integer.

Also use atomic_load_int(9) to load `securelevel'. sysctl_securelevel()
is mp-safe, but will be under kernel lock until all exi

Unlock KERN_ALLOWKMEM. The `allowkmem' is atomically accessed integer.

Also use atomic_load_int(9) to load `securelevel'. sysctl_securelevel()
is mp-safe, but will be under kernel lock until all existing
`securelevel' loading became mp-safe too.

ok mpi

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If an ioctl(2) request isn't implemented we should return ENOTTY.

ok deraadt@

Remove almost unused `flags' argument of suser().

The account flag `ASU' will no longer be set but that makes suser()
mpsafe since it no longer mess with a per-process field.

No objection from mill

Remove almost unused `flags' argument of suser().

The account flag `ASU' will no longer be set but that makes suser()
mpsafe since it no longer mess with a per-process field.

No objection from millert@, ok tedu@, bluhm@

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fcntl(F_SETFL) invokes the FIONBIO and FIOASYNC ioctls internally, so
the memory devices (/dev/null, /dev/zero, etc) need to permit them.

problem noted, tweak, and testing by jeremy@
ok deraadt@

Make a move towards ending 4 decades of kernel snooping.

Add sysctl kern.allowkmem (default 0) which controls the ability to open
/dev/mem or /dev/kmem at securelevel > 0. Over 15 years we converte

Make a move towards ending 4 decades of kernel snooping.

Add sysctl kern.allowkmem (default 0) which controls the ability to open
/dev/mem or /dev/kmem at securelevel > 0. Over 15 years we converted 99%
of utilities in the tree to operate on sysctl-nodes (either by themselves
or via code hiding in the guts of -lkvm).

pstat -d and -v & procmap are affected and continued use of them will
require kern.allowkmem=1 in /etc/sysctl.conf. acpidump (and it's
buddy sendbug) are affected, but we'll work out a solution soon.

There will be some impact in ports.

ok kettenis guenther

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remove #define for /dev/mem minors. let the raw magic of the hardcoded
numbers serve as a warning not to touch them.

normalize some comments

Convert to uiomove().
ok guenther@

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
-

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
- rewrite uiomovei() as an uiomove() wrapper.
ok kettenis@

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Kill pmap_phys_address(), and force every driver's mmap() routine to return
a physical address [more precisely, something suitable to pass to pmap_enter()'sphysical address argument].

This allows MI

Kill pmap_phys_address(), and force every driver's mmap() routine to return
a physical address [more precisely, something suitable to pass to pmap_enter()'sphysical address argument].

This allows MI drivers to implement mmap() routines without having to know
about the pmap_phys_address() implementation and #ifdef obfuscation.

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Simpliest memset(,0,) -> M_ZERO changes. One (caddr *) cast removal,
otherwise just adding M_ZERO to malloc() and removing the immediately
adjacent memset(,0,).

Allow kmem to work, might not quite be right yet, but allows basic
functionality. sort of ok miod@

Preliminary bits for SuperH-based ports, based on NetBSD/sh3 codebase with
minor changes.