Various minor cleanups and bug fixes to the FP software completion code:
- Use __CTASSERT() instead of rolling our own compile-time assertion
using cpp.
- Use __BIT() &c instead of rolling our own.

Various minor cleanups and bug fixes to the FP software completion code:
- Use __CTASSERT() instead of rolling our own compile-time assertion
using cpp.
- Use __BIT() &c instead of rolling our own.
- Improve some comments.
- Define a default FP_C and FPCR value that is self-consistent, and
initialize it properly at process creation time.
- Fix signal information when the trap shadow cannot be resolved.
- Use defined constants rather than magic numbers for the exception
summary bits.
- Add a machdep sysctl to enable FP software-completion debugging.

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Optimized fast-paths for rw_enter() / rw_tryenter() / rw_exit().

Remove unnecessary #include <sys/malloc.h>

Add _UC_SETSTACK / _UC_CLRSTACK handling. Fixes the t_sigaltstack test
on alpha.

Remove unused dot_conv() function.

Disable preemption around the main work of badaddr_read() and delay();
they both use "current CPU" resources.

Expose a bunch of CPU details, including implementation version and
architecture extensions, via sysctl:

hw.cpu0.model = 21264A-0 (EV67)
hw.cpu0.major = 11
hw.cpu0.minor = 0
hw.cpu0.implver = 2
hw.c

Expose a bunch of CPU details, including implementation version and
architecture extensions, via sysctl:

hw.cpu0.model = 21264A-0 (EV67)
hw.cpu0.major = 11
hw.cpu0.minor = 0
hw.cpu0.implver = 2
hw.cpu0.amask = 0x1307
hw.cpu0.bwx = 1
hw.cpu0.fix = 1
hw.cpu0.cix = 1
hw.cpu0.mvi = 1
hw.cpu0.pat = 1
hw.cpu0.pmi = 1
hw.cpu0.vax_fp = 1
hw.cpu0.ieee_fp = 1
hw.cpu0.primary_eligible = 1
hw.cpu0.primary = 1
hw.cpu0.cpu_id = 0
hw.cpu0.pcc_freq = 239990688

as well as some potentially interesting system-level variables:

machdep.cctr = 0
machdep.is_qemu = 1

Should address the basic concern in PR port-alpha/15835.

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Add a mechanism to allow a platform to optionally shelter some region
of physical memory from random allocations from the default VM page
free list. Use this hook to shelter regions within 0-16MB of

Add a mechanism to allow a platform to optionally shelter some region
of physical memory from random allocations from the default VM page
free list. Use this hook to shelter regions within 0-16MB of physical
RAM on Jensen and Irongate systems; those platforms do not have SGMAP
DMA, and so we need to shelter this range so that devices using ISA DMA
(e.g. floppy controller) have an opportunity to allocate DMA-safe memory.

PR port-alpha/27087

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G/C alpha_XXX_dmamap() / alpha_XXX_dmamap_or. They haven't been needed
for a long time.

Qemu loads the kernel directly, and so there's no bootloader to provide
a "bootinfo" structure for us. Qemu does, however, place a Linux kernel
parameter block at kernel_text[] - 0x6000 that contain

Qemu loads the kernel directly, and so there's no bootloader to provide
a "bootinfo" structure for us. Qemu does, however, place a Linux kernel
parameter block at kernel_text[] - 0x6000 that contains Linux-style kernel
command line arguments. So, add a prom_qemu_getenv() that allows us to
look for specific things passed along to the kernel from there, and use
them as follows:

- Support specifying the root device in the forms "root=/dev/wd0a",
"root=wd0a", or "rootdev=wd0".
- Support SRM-like -flags ... in the form of "flags=AD". In the case of
Qemu, we also assume that no flags=... is the same as "flags=A", i.e.
perform an auto-boot.

Also allow an alternate delay() function to be specified, if the platform
wishes to provide one.

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prom_is_qemu -> alpha_is_qemu, and export it outside of prom.c.

Use SysValue to store curlwp rather than curcpu. curlwp is acceessed
much more frequently, and this makes curlwp preemption-safe.

Clean up all of the _PMAP_MAY_USE_PROM_CONSOLE crapola, centralizing the
logic in prom.c, and rename it _PROM_MAY_USE_PROM_CONSOLE in a few places
it's still needed.

Nix trailing whitespace.

- cpu_need_resched(): Explicitly cover each RESCHED_* case, and add a
comment explaining why we don't need to act on IDLE+REMOTE.
- cpu_signotify(): Move to machdep.c, and if we're asked to notify

- cpu_need_resched(): Explicitly cover each RESCHED_* case, and add a
comment explaining why we don't need to act on IDLE+REMOTE.
- cpu_signotify(): Move to machdep.c, and if we're asked to notify
an LWP running on another CPU, send an AST IPI to that CPU. Add some
assertions.
- cpu_need_proftick(): Move to machdep.c, add some assertions.

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uvm_availmem(): give it a boolean argument to specify whether a recent
cached value will do, or if the very latest total must be fetched. It can
be called thousands of times a second and fetching th

uvm_availmem(): give it a boolean argument to specify whether a recent
cached value will do, or if the very latest total must be fetched. It can
be called thousands of times a second and fetching the totals impacts not
only the calling LWP but other CPUs doing unrelated activity in the VM
system.

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Fix a couple of printf formats in debug messages.

Make it clear that the pfn argument to alpha_init() is no longer used.

Rename uvm_free() -> uvm_availmem().

uvmexp.free -> uvm_free()

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is requ

cpu_need_resched():

- Remove all code that should be MI, leaving the bare minimum under arch/.
- Make the required actions very explicit.
- Pass in LWP pointer for convenience.
- When a trap is required on another CPU, have the IPI set it locally.
- Expunge cpu_did_resched().

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Prrovide a basic (i.e. empty) module_init_md(). MODULAR doesn't quite
work yet (missing support for a couple of relocations), but at last the
kernel links.

Remove compat_osf1, discussed on tech-kern@.

Fix widespread leak in the sendsig_siginfo() functions. sigframe_siginfo
has padding, so zero it out properly. While here I'm also zeroing out some
other things in several ports, for safety. Same pro

Fix widespread leak in the sendsig_siginfo() functions. sigframe_siginfo
has padding, so zero it out properly. While here I'm also zeroing out some
other things in several ports, for safety. Same problem in netbsd32, so
fix that too.

I can't compile-test on each architecture, but there should be no
breakage (tm).

Overall this fixes at least 14 info leaks. Prompted by the discovery by
KLEAK of a leak in amd64's sendsig_siginfo.

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Rename min/max -> uimin/uimax for better honesty.

These functions are defined on unsigned int. The generic name
min/max should not silently truncate to 32 bits on 64-bit systems.
This is purely a n

Rename min/max -> uimin/uimax for better honesty.

These functions are defined on unsigned int. The generic name
min/max should not silently truncate to 32 bits on 64-bit systems.
This is purely a name change -- no functional change intended.

HOWEVER! Some subsystems have

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

even though our standard name for that is MIN/MAX. Although these
may invite multiple evaluation bugs, these do _not_ cause integer
truncation.

To avoid `fixing' these cases, I first changed the name in libkern,
and then compile-tested every file where min/max occurred in order to
confirm that it failed -- and thus confirm that nothing shadowed
min/max -- before changing it.

I have left a handful of bootloaders that are too annoying to
compile-test, and some dead code:

cobalt ews4800mips hp300 hppa ia64 luna68k vax
acorn32/if_ie.c (not included in any kernels)
macppc/if_gm.c (superseded by gem(4))

It should be easy to fix the fallout once identified -- this way of
doing things fails safe, and the goal here, after all, is to _avoid_
silent integer truncations, not introduce them.

Maybe one day we can reintroduce min/max as type-generic things that
never silently truncate. But we should avoid doing that for a while,
so that existing code has a chance to be detected by the compiler for
conversion to uimin/uimax without changing the semantics until we can
properly audit it all. (Who knows, maybe in some cases integer
truncation is actually intended!)

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