Major update to the way synchronization is done in the kernel. Highlights

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

1 files changed, 79 insertions, 0 deletions

diff --git a/sys/powerpc/include/globaldata.h b/sys/powerpc/include/globaldata.h
new file mode 100644
index 0000000..b246bb1
--- /dev/null
+++ b/sys/powerpc/include/globaldata.h
@@ -0,0 +1,79 @@
+/*-
+ * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_MACHINE_GLOBALDATA_H_
+#define	_MACHINE_GLOBALDATA_H_
+
+#ifdef _KERNEL
+
+#include <sys/queue.h>
+
+/*
+ * This structure maps out the global data that needs to be kept on a
+ * per-cpu basis.  genassym uses this to generate offsets for the assembler
+ * code, which also provides external symbols so that C can get at them as
+ * though they were really globals. This structure is pointed to by
+ * the per-cpu system value (see alpha_pal_rdval() and alpha_pal_wrval()).
+ * Inside the kernel, the globally reserved register t7 is used to
+ * point at the globaldata structure.
+ */
+struct globaldata {
+	struct alpha_pcb gd_idlepcb;		/* pcb for idling */
+	struct proc	*gd_curproc;		/* current process */
+	struct proc	*gd_idleproc;		/* idle process */
+	struct proc	*gd_fpcurproc;		/* fp state owner */
+	struct pcb	*gd_curpcb;		/* current pcb */
+	struct timeval	gd_switchtime;	
+	int		gd_switchticks;
+	u_int		gd_cpuno;		/* this cpu number */
+	u_int		gd_other_cpus;		/* all other cpus */
+	int		gd_inside_intr;
+	u_int64_t	gd_idlepcbphys;		/* pa of gd_idlepcb */
+	u_int64_t	gd_pending_ipis;	/* pending IPI events */
+	u_int32_t	gd_next_asn;		/* next ASN to allocate */
+	u_int32_t	gd_current_asngen;	/* ASN rollover check */
+	u_int32_t	gd_intr_nesting_level;  /* interrupt recursion */
+
+	u_int		gd_astpending;
+	SLIST_ENTRY(globaldata) gd_allcpu;
+#ifdef KTR_PERCPU
+	volatile int	gd_ktr_idx;		/* Index into trace table */
+	char		*gd_ktr_buf;
+	char		gd_ktr_buf_data[0];
+#endif
+};
+
+SLIST_HEAD(cpuhead, globaldata);
+extern struct cpuhead cpuhead;
+
+void globaldata_init(struct globaldata *pcpu, int cpuno, size_t sz);
+struct globaldata *globaldata_find(int cpuno);
+
+#endif	/* _KERNEL */
+
+#endif	/* !_MACHINE_GLOBALDATA_H_ */