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opnsense-src/sys/i386/include
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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 These appear to be unused in our tree, so remove them. 2005-01-05 20:50:31 +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 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
apicreg.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
apicvar.h Use the local APIC timer to drive the various kernel clocks on SMP machines 2005-02-08 20:25:07 +00:00
apm_bios.h Move pc98 specific parts to the pc98 specific file. 2005-04-03 23:27:11 +00:00
apm_segments.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
asm.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
asmacros.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
atomic.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
bootinfo.h Libdisk does not need to include <sys/diskslice.h> any more. 2003-04-04 16:35:16 +00:00
bus.h With pc98/include, we can have pc98 and i386 specific bus space 2005-04-03 17:47:03 +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
clock.h - Remove the BURN_BRIDGES marked support for hooking into the ISA timer 0 2005-03-09 15:33:58 +00:00
cpu.h Initiate deorbit burn sequence for 80386 support in FreeBSD: Remove 2004-11-16 20:42:32 +00:00
cpufunc.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
cputypes.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
cserial.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
db_machdep.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
elan_mmcr.h Expand indirect reference to BSD license with the current one. 2005-01-06 22:05:28 +00:00
elf.h Add definitions for TLS relocations. 2004-08-02 19:12:17 +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 The file machine/ieeefp.h needs sys/cdefs.h on amd64 and i386 after my 2005-04-02 17:31:42 +00:00
frame.h Update for the KDB framework: 2004-07-10 22:11:14 +00:00
gdb_machdep.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_cause.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_debug.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_rbch_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_tel_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_trace.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
ieeefp.h Remove fpsetsticky(). This was added for SysV compatibility, but due 2005-03-15 15:53:39 +00:00
if_wl_wavelan.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +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_machdep.h Tweak the ELCR support slightly. Explicitly probe the ELCR during boot 2005-01-18 20:24:47 +00:00
ioctl_bt848.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
ioctl_meteor.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
iodev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
kdb.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
legacyvar.h With pc98/include, we can have pc98 and i386 specific bus space 2005-04-03 17:47:03 +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 Move pc98 specific parts to the pc98 specific file. 2005-04-03 23:27:11 +00:00
memdev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
metadata.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
mp_watchdog.h Add an "options MP_WATCHDOG" to i386. This option allows one of the 2004-08-15 18:02:09 +00:00
mptable.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
mutex.h GC #if 0'd assembly mutex micro operations. If someone wants to bring 2002-03-28 15:14:23 +00:00
npx.h Initialize the mxcsr properly, so the initial value in a process isn't 2005-03-17 22:21:36 +00:00
param.h Remove UAREA_PAGES. 2004-11-20 02:29:50 +00:00
pcaudioio.h $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
pcb.h Implement makectx(). The makectx() function is used by KDB to create 2004-07-10 19:56:00 +00:00
pcb_ext.h Remove __P. 2002-03-20 05:48:58 +00:00
pci_cfgreg.h Move pc98 specific parts to the pc98 specific file. 2005-04-03 23:27:11 +00:00
pcpu.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
pcvt_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
pecoff_machdep.h Add PECOFF (WIN32 Execution file format) support. 2000-12-20 12:51:08 +00:00
perfmon.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
pmap.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
privatespace.h Overhaul the per-CPU support a bit: 2001-12-11 23:33:44 +00:00
proc.h Divorce critical sections from spinlocks. Critical sections as denoted by 2005-04-04 21:53:56 +00:00
profile.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
psl.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
ptrace.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
reg.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
reloc.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +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
segments.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
setjmp.h Fix namespace issues by using visibility conditionals from 2002-10-05 05:47:56 +00:00
sf_buf.h Implement support for CPU private mappings within sf_buf_alloc(). 2005-02-13 06:23:13 +00:00
sigframe.h Split 4.x and 5.x signal handling so that we can keep 4.x signal 2002-10-25 19:10:58 +00:00
signal.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
smapi.h Use __packed; 2003-03-24 20:44:39 +00:00
smp.h Use the local APIC timer to drive the various kernel clocks on SMP machines 2005-02-08 20:25:07 +00:00
smptests.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
speaker.h Very minor whitespace/style nit. 2002-10-23 10:14:30 +00:00
specialreg.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +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 o Move copyin()/copyout() out of i386_{get,set}_ldt() and 2005-01-26 13:59:46 +00:00
trap.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
tss.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
ucontext.h Align the FPU state in the ucontext and sigcontext to 16 bytes 2002-12-02 19:58:55 +00:00
varargs.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
vm86.h 1.Fix smp race between kernel vm86 BIOS calling and userland vm86 mode code, 2002-11-07 01:34:23 +00:00
vmparam.h Increase the scaling of VM_KMEM_SIZE_MAX. 2004-08-16 08:35:22 +00:00