John Baldwin c6a37e8413 Divorce critical sections from spinlocks. Critical sections as denoted by ... critical_enter() and critical_exit() are now solely a mechanism for deferring kernel preemptions. They no longer have any affect on interrupts. This means that standalone critical sections are now very cheap as they are simply unlocked integer increments and decrements for the common case. Spin mutexes now use a separate KPI implemented in MD code: spinlock_enter() and spinlock_exit(). This KPI is responsible for providing whatever MD guarantees are needed to ensure that a thread holding a spin lock won't be preempted by any other code that will try to lock the same lock. For now all archs continue to block interrupts in a "spinlock section" as they did formerly in all critical sections. Note that I've also taken this opportunity to push a few things into MD code rather than MI. For example, critical_fork_exit() no longer exists. Instead, MD code ensures that new threads have the correct state when they are created. Also, we no longer try to fixup the idlethreads for APs in MI code. Instead, each arch sets the initial curthread and adjusts the state of the idle thread it borrows in order to perform the initial context switch. This change is largely a big NOP, but the cleaner separation it provides will allow for more efficient alternative locking schemes in other parts of the kernel (bare critical sections rather than per-CPU spin mutexes for per-CPU data for example). Reviewed by: grehan, cognet, arch@, others Tested on: i386, alpha, sparc64, powerpc, arm, possibly more		2005-04-04 21:53:56 +00:00
..
pc	Remove headers copied from i386 and either useless or wrong on ia64.	2003-11-02 09:19:07 +00:00
_inttypes.h
_limits.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
_regset.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
_stdint.h	<stdint.h> should define WINT_M{AX,IN} independent from whether WCHAR_MIN is	2004-05-18 16:04:57 +00:00
_types.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
acpica_machdep.h	Move the code for halting the CPU (acpi_cpu_c1) into machdep files.	2004-10-11 05:39:15 +00:00
asm.h	nit in /*-	2005-01-31 08:16:45 +00:00
atomic.h	For the atomic_{add|clear|set|subtract} family of inlines, return the	2004-09-22 19:58:43 +00:00
bootinfo.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
bus_dma.h	Refactor the bus_dma header files so that the interface is described in	2005-03-14 16:46:28 +00:00
bus_memio.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
bus_pio.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
bus.h	Refactor the bus_dma header files so that the interface is described in	2005-03-14 16:46:28 +00:00
clock.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
clockvar.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
cpu.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
cpufunc.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
db_machdep.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
dig64.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
efi.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
elf.h	Add sysentvec->sv_fixlimits() hook so that we can catch cases on 64 bit	2003-09-25 01:10:26 +00:00
endian.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
exec.h	Use a common multi-inclusion protection, and add such a	2005-02-19 21:16:48 +00:00
float.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
floatingpoint.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
fpu.h	Use primitive types to avoid creating an artificial header dependency:	2004-12-11 06:15:12 +00:00
frame.h	Revamp of the syscall path, exception and context handling. The	2003-05-16 21:26:42 +00:00
gdb_machdep.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
ia64_cpu.h	Add an instruction group break after the move to application register	2003-08-15 05:46:33 +00:00
ieee.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
ieeefp.h	Cleanup and style(9) fixes. No functional change.	2003-08-11 21:25:19 +00:00
in_cksum.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
intr.h
intrcnt.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
kdb.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
limits.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
mca.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
md_var.h	Further enhance the handling of misaligned loads and stores:	2005-01-02 00:20:54 +00:00
memdev.h	Remove extraneous ';'.	2004-08-01 18:51:44 +00:00
mutex.h
nexusvar.h
pal.h
param.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pcb.h	As I said: the previous commit was untested... Remove an #endif which	2004-08-16 19:05:08 +00:00
pci_cfgreg.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pcpu.h	Fixed a pedantic syntax error (a stray semicolon at the end of	2003-11-17 03:40:41 +00:00
pmap.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
proc.h	Divorce critical sections from spinlocks. Critical sections as denoted by	2005-04-04 21:53:56 +00:00
profile.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pte.h	Remove struct ia64_itir and use a plain old uint64_t instead.	2004-11-21 21:40:08 +00:00
ptrace.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
reg.h	Replace uint64_t with unsigned long in struct dbreg.	2004-03-20 05:27:14 +00:00
reloc.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
resource.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
runq.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
sal.h	MFp4:	2004-09-19 03:50:46 +00:00
sapicreg.h
sapicvar.h	Rewrite the SAPIC initialization to always program the RTEs with what	2003-09-10 22:49:38 +00:00
setjmp.h	Avoid using __aligned(16). Instead define the jmp_buf in terms of	2003-07-26 08:03:43 +00:00
sf_buf.h	MFamd64	2004-04-18 07:11:12 +00:00
sigframe.h
signal.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
smp.h	Revamp of the syscall path, exception and context handling. The	2003-05-16 21:26:42 +00:00
stdarg.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
sysarch.h	Provide sysarch(2) prototypes in the MD sysarch.h headers. While I'm	2004-01-09 16:52:09 +00:00
ucontext.h	Simplify the contexts created by the kernel and remove the related	2003-12-07 20:47:33 +00:00
unwind.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
varargs.h	Drop any and all support for varargs. There's no history to worry	2003-09-28 05:34:07 +00:00
vmparam.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00