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* Stage-2 commit of the critical*() code. This re-inlines cpu_critical_enter()Matthew Dillon2002-04-011-5/+0
| | | | | | | | | | | | | | | | | | | | | | | | and cpu_critical_exit() and moves associated critical prototypes into their own header file, <arch>/<arch>/critical.h, which is only included by the three MI source files that need it. Backout and re-apply improperly comitted syntactical cleanups made to files that were still under active development. Backout improperly comitted program structure changes that moved localized declarations to the top of two procedures. Partially re-apply one of the program structure changes to move 'mask' into an intermediate block rather then in three separate sub-blocks to make the code more readable. Re-integrate bug fixes that Jake made to the sparc64 code. Note: In general, developers should not gratuitously move declarations out of sub-blocks. They are where they are for reasons of structure, grouping, readability, compiler-localizability, and to avoid developer-introduced bugs similar to several found in recent years in the VFS and VM code. Reviewed by: jake Notes: svn path=/head/; revision=93607
* Compromise for critical*()/cpu_critical*() recommit. Cleanup the interruptMatthew Dillon2002-03-271-13/+5
| | | | | | | | | | | | | | | | | | | | | | disablement assumptions in kern_fork.c by adding another API call, cpu_critical_fork_exit(). Cleanup the td_savecrit field by moving it from MI to MD. Temporarily move cpu_critical*() from <arch>/include/cpufunc.h to <arch>/<arch>/critical.c (stage-2 will clean this up). Implement interrupt deferral for i386 that allows interrupts to remain enabled inside critical sections. This also fixes an IPI interlock bug, and requires uses of icu_lock to be enclosed in a true interrupt disablement. This is the stage-1 commit. Stage-2 will occur after stage-1 has stabilized, and will move cpu_critical*() into its own header file(s) + other things. This commit may break non-i386 architectures in trivial ways. This should be temporary. Reviewed by: core Approved by: core Notes: svn path=/head/; revision=93264
* Fix abuses of cpu_critical_{enter,exit} by converting toWarner Losh2002-03-211-0/+13
| | | | | | | | intr_{disable,restore} as well as providing an implemenation of intr_{disable,restore}. Notes: svn path=/head/; revision=92859
* Modify the critical section API as follows:John Baldwin2001-12-181-2/+4
| | | | | | | | | | | | | | | | | | | | | | - The MD functions critical_enter/exit are renamed to start with a cpu_ prefix. - MI wrapper functions critical_enter/exit maintain a per-thread nesting count and a per-thread critical section saved state set when entering a critical section while at nesting level 0 and restored when exiting to nesting level 0. This moves the saved state out of spin mutexes so that interlocking spin mutexes works properly. - Most low-level MD code that used critical_enter/exit now use cpu_critical_enter/exit. MI code such as device drivers and spin mutexes use the MI wrappers. Note that since the MI wrappers store the state in the current thread, they do not have any return values or arguments. - mtx_intr_enable() is replaced with a constant CRITICAL_FORK which is assigned to curthread->td_savecrit during fork_exit(). Tested on: i386, alpha Notes: svn path=/head/; revision=88088
* Block out all interrupts, even machine checks, for critical_enter()Andrew Gallatin2001-04-211-1/+1
| | | | | | | | | | This is will be required to prevent lowering the ipl when a critical_enter() is present in the interrupt path when handling a machine check. reviewed by: jhb Notes: svn path=/head/; revision=75806
* - Add the new critical_t type used to save state inside of criticalJohn Baldwin2001-03-281-19/+4
| | | | | | | | | | | | sections. - Add implementations of the critical_enter() and critical_exit() functions and remove restore_intr() and save_intr(). - Remove the somewhat bogus disable_intr() and enable_intr() functions on the alpha as the alpha actually uses a priority level and not simple bit flag on the CPU. Notes: svn path=/head/; revision=74897
* Major update to the way synchronization is done in the kernel. HighlightsJason Evans2000-09-071-0/+28
| | | | | | | | | | | | | | | | | | include: * Mutual exclusion is used instead of spl*(). See mutex(9). (Note: The alpha port is still in transition and currently uses both.) * Per-CPU idle processes. * Interrupts are run in their own separate kernel threads and can be preempted (i386 only). Partially contributed by: BSDi (BSD/OS) Submissions by (at least): cp, dfr, dillon, grog, jake, jhb, sheldonh Notes: svn path=/head/; revision=65557
* * Completely rewrite the alpha busspace to hide the implementation fromDoug Rabson2000-08-281-70/+0
| | | | | | | | | | | | | | | the drivers. * Remove legacy inx/outx support from chipset and replace with macros which call busspace. * Rework pci config accesses to route through the pcib device instead of calling a MD function directly. With these changes it is possible to cleanly support machines which have more than one independantly numbered PCI busses. As a bonus, the new busspace implementation should be measurably faster than the old one. Notes: svn path=/head/; revision=65176
* Port ppc driver to alpha.Doug Rabson2000-05-141-0/+14
| | | | | | | Submitted by: Andrew M. Miklic <miklic@ibm.net> Notes: svn path=/head/; revision=60544
* Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"Peter Wemm1999-12-291-2/+2
| | | | | | | | | is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come. Notes: svn path=/head/; revision=55205
* $Id$ -> $FreeBSD$Peter Wemm1999-08-281-1/+1
| | | | Notes: svn path=/head/; revision=50477
* Bring the 'new-bus' to the i386. This extensively changes the way thePeter Wemm1999-04-161-1/+35
| | | | | | | | | | | | | | | | | | | | | i386 platform boots, it is no longer ISA-centric, and is fully dynamic. Most old drivers compile and run without modification via 'compatability shims' to enable a smoother transition. eisa, isapnp and pccard* are not yet using the new resource manager. Once fully converted, all drivers will be loadable, including PCI and ISA. (Some other changes appear to have snuck in, including a port of Soren's ATA driver to the Alpha. Soren, back this out if you need to.) This is a checkpoint of work-in-progress, but is quite functional. The bulk of the work was done over the last few years by Doug Rabson and Garrett Wollman. Approved by: core Notes: svn path=/head/; revision=45720
* Add breakpoint() for BREAK_TO_DEBUGGER.Doug Rabson1998-08-171-1/+11
| | | | Notes: svn path=/head/; revision=38389
* Add macros and chipset support for accessing device i/o memory on the alpha.Doug Rabson1998-07-221-1/+16
| | | | Notes: svn path=/head/; revision=37831
* Add initial support for the FreeBSD/alpha kernel. This is very much aDoug Rabson1998-06-101-0/+46
work in progress and has never booted a real machine. Initial development and testing was done using SimOS (see http://simos.stanford.edu for details). On the SimOS simulator, this port successfully reaches single-user mode and has been tested with loads as high as one copy of /bin/ls :-). Obtained from: partly from NetBSD/alpha Notes: svn path=/head/; revision=36849
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