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
..
_inttypes.h	Since printf(3) now supports the `j' conversion specifier, use that	2002-06-30 05:48:03 +00:00
_limits.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +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
asm.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
atomic.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
bat.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
bootinfo.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +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
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 license, minor formatting changes	2005-01-07 02:29:27 +00:00
bus_pio.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
clock.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
cpu.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
cpufunc.h	Always isync after a mtmsr. While perhaps not strictly necessary for PSL_EE	2004-08-07 00:20:00 +00:00
db_machdep.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
elf.h	Implement TLS relocations for powerpc.	2004-11-02 09:47:01 +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 license, minor formatting changes	2005-01-07 02:29:27 +00:00
floatingpoint.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
fpu.h	Not all cpus are MPC750s. Replace the MPC750 cpu option with OEA. This	2003-02-05 11:37:59 +00:00
frame.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
hid.h	HID0 updates:	2005-02-04 01:14:38 +00:00
ieee.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
ieeefp.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
in_cksum.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
interruptvar.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
intr.h	Remove __P.	2002-03-20 23:17:50 +00:00
intr_machdep.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
ipl.h	This commit (along with one pending in sys/dev/ofw and one in sys/conf) give	2001-06-16 07:14:07 +00:00
kdb.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
limits.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
md_var.h	Further cleanup <machine/cpu.h> and <machine/md_var.h>: move the MI	2003-08-16 16:57:57 +00:00
memdev.h	Add /dev/mem and /dev/kmem to powerpc.	2004-08-16 13:07:40 +00:00
metadata.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
mutex.h	Modify the critical section API as follows:	2001-12-18 00:27:18 +00:00
nexusvar.h	Remove hard-coded knowledge of specific OFW devices. Use bus_generic_probe	2004-01-13 11:20:52 +00:00
ofw_machdep.h	Add /dev/mem and /dev/kmem to powerpc.	2004-08-16 13:07:40 +00:00
openpicreg.h	Driver for OpenPIC compatible interrupt controllers.	2002-07-09 11:26:10 +00:00
openpicvar.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
param.h	Remove UAREA_PAGES.	2004-11-20 02:29:50 +00:00
pcb.h	Add prototype for KDB's makectx routine	2004-07-12 22:17:20 +00:00
pcpu.h	Gratuitous namechange to avoid low-level association with ddb.	2004-07-12 22:18:02 +00:00
pio.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
pmap.h	Add pmap locking to many of the functions.	2004-08-26 04:15:36 +00:00
powerpc.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +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 license, minor formatting changes	2005-01-07 02:29:27 +00:00
psl.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
pte.h	1. Better track the executable status of mappings.	2002-05-09 14:09:19 +00:00
ptrace.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
reg.h	Add comment explaining struct reg and struct fpreg must match the trapframe.	2004-07-29 13:39:27 +00:00
reloc.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
resource.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
runq.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
sc_machdep.h	A syscons implementation using the 8-bit framebuffer set up by	2004-01-21 05:16:23 +00:00
setjmp.h	Fix namespace issues by using visibility conditionals from	2002-10-05 05:47:56 +00:00
sf_buf.h	MFamd64	2004-04-18 08:10:04 +00:00
sigframe.h	Removed osigframe. No need for COMPAT_43 signal bin-compat in PPC.	2002-09-19 04:46:36 +00:00
signal.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
smp.h	This commit (along with one pending in sys/dev/ofw and one in sys/conf) give	2001-06-16 07:14:07 +00:00
spr.h	- add definitions for MPC7447A/7448 (i.e. miniMac)	2005-02-04 01:17:04 +00:00
sr.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
stdarg.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
trap.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
ucontext.h	/* -> /*- for license, minor formatting changes	2005-01-07 02:29:27 +00:00
varargs.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
vmparam.h	Increase kernel VA from 256Mb to 512Mb by shifting the segment used	2004-03-02 06:49:21 +00:00