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freebsd-skq/sys/amd64/include/critical.h

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Stage-2 commit of the critical*() code. This re-inlines cpu_critical_enter() 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
2002-04-01 23:51:23 +00:00
/*-
* Copyright (c) 2002 Matthew Dillon. This code is distributed under
* the BSD copyright, /usr/src/COPYRIGHT.
*
* This file contains prototypes and high-level inlines related to
* machine-level critical function support:
*
* cpu_critical_enter() - inlined
* cpu_critical_exit() - inlined
* cpu_critical_fork_exit() - prototyped
* cpu_thread_link() - prototyped
* related support functions residing
* in <arch>/<arch>/critical.c - prototyped
*
* $FreeBSD$
*/
#ifndef _MACHINE_CRITICAL_H_
#define _MACHINE_CRITICAL_H_
__BEGIN_DECLS
/*
* Prototypes - see <arch>/<arch>/critical.c
*/
void cpu_critical_fork_exit(void);
void cpu_thread_link(struct thread *td);
#ifdef __GNUC__
/*
* cpu_critical_enter:
*
* This routine is called from critical_enter() on the 0->1 transition
* of td_critnest, prior to it being incremented to 1.
*/
Commit MD parts of a loosely functional AMD64 port. This is based on a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
2003-05-01 01:05:25 +00:00
static __inline void
cpu_critical_enter(void)
{
struct thread *td;
td = curthread;
td->td_md.md_savecrit = intr_disable();
}
Stage-2 commit of the critical*() code. This re-inlines cpu_critical_enter() 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
2002-04-01 23:51:23 +00:00
/*
* cpu_critical_exit:
*
* This routine is called from critical_exit() on a 1->0 transition
* of td_critnest, after it has been decremented to 0. We are
* exiting the last critical section.
*/
static __inline void
cpu_critical_exit(void)
{
Commit MD parts of a loosely functional AMD64 port. This is based on a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
2003-05-01 01:05:25 +00:00
struct thread *td;
td = curthread;
intr_restore(td->td_md.md_savecrit);
Stage-2 commit of the critical*() code. This re-inlines cpu_critical_enter() 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
2002-04-01 23:51:23 +00:00
}
#else /* !__GNUC__ */
void cpu_critical_enter(void)
void cpu_critical_exit(void)
#endif /* __GNUC__ */
__END_DECLS
#endif /* !_MACHINE_CRITICAL_H_ */
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