From 3ad295d41646d81ef12f3b5e99af833ef91f660f Mon Sep 17 00:00:00 2001
From: dillon <dillon@FreeBSD.org>
Date: Mon, 1 Apr 2002 23:51:23 +0000
Subject: 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
---
 sys/powerpc/include/cpufunc.h  |  6 ----
 sys/powerpc/include/critical.h | 76 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 6 deletions(-)
 create mode 100644 sys/powerpc/include/critical.h

(limited to 'sys/powerpc/include')

diff --git a/sys/powerpc/include/cpufunc.h b/sys/powerpc/include/cpufunc.h
index b788aa6..429e83b 100644
--- a/sys/powerpc/include/cpufunc.h
+++ b/sys/powerpc/include/cpufunc.h
@@ -132,12 +132,6 @@ powerpc_get_pcpup(void)
 	return(ret);
 }
 
-void	cpu_critical_enter(void);
-void	cpu_critical_exit(void);
-void	cpu_critical_fork_exit(void);
-void	cpu_thread_link(struct thread *td);
-
-
 #endif /* _KERNEL */
 
 #endif /* !_MACHINE_CPUFUNC_H_ */
diff --git a/sys/powerpc/include/critical.h b/sys/powerpc/include/critical.h
new file mode 100644
index 0000000..08184bd
--- /dev/null
+++ b/sys/powerpc/include/critical.h
@@ -0,0 +1,76 @@
+/*-
+ * 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)
+{
+	u_int           msr;
+	struct thread	*td = curthread;
+
+	msr = mfmsr();
+	td->td_md.md_savecrit = msr;
+	msr &= ~(PSL_EE | PSL_RI);
+	mtmsr(msr);
+}
+
+/*
+ *	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 = curthread;
+
+	mtmsr(td->td_md.md_savecrit);
+}
+
+
+#else /* !__GNUC__ */
+
+void cpu_critical_enter(void)
+void cpu_critical_exit(void)
+
+#endif	/* __GNUC__ */
+
+__END_DECLS
+
+#endif /* !_MACHINE_CRITICAL_H_ */
+
-- 
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