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authorMatthew Dillon <dillon@FreeBSD.org>2002-04-01 23:51:23 +0000
committerMatthew Dillon <dillon@FreeBSD.org>2002-04-01 23:51:23 +0000
commit182da8209d4cda12e2d510e06f9e4b516171f9b6 (patch)
treeec7d3de3f9fac7137b9779c10d8281315efa3647 /sys/sparc64/include/critical.h
parentad68ab89e2c36e378d03ab777464dcc8a24a43a0 (diff)
downloadsrc-182da8209d4cda12e2d510e06f9e4b516171f9b6.tar.gz
src-182da8209d4cda12e2d510e06f9e4b516171f9b6.zip
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
Notes
Notes: svn path=/head/; revision=93607
Diffstat (limited to 'sys/sparc64/include/critical.h')
-rw-r--r--sys/sparc64/include/critical.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/sys/sparc64/include/critical.h b/sys/sparc64/include/critical.h
new file mode 100644
index 000000000000..eee9914adc12
--- /dev/null
+++ b/sys/sparc64/include/critical.h
@@ -0,0 +1,75 @@
+/*-
+ * 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.
+ */
+static __inline void
+cpu_critical_enter(void)
+{
+ struct thread *td;
+ critical_t pil;
+
+ td = curthread;
+ pil = rdpr(pil);
+ wrpr(pil, 0, 14);
+ td->td_md.md_savecrit = pil;
+}
+
+
+/*
+ * 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)
+{
+ struct thread *td;
+
+ td = curthread;
+ wrpr(pil, td->td_md.md_savecrit, 0);
+}
+
+#else /* !__GNUC__ */
+
+void cpu_critical_enter(void)
+void cpu_critical_exit(void)
+
+#endif /* __GNUC__ */
+
+__END_DECLS
+
+#endif /* !_MACHINE_CRITICAL_H_ */