Introduce the new kernel sub-tree x86 which should contain all the code

shared and generalized between our current amd64, i386 and pc98.

This is just an initial step that should lead to a more complete effort.
For the moment, a very simple porting of cpufreq modules, BIOS calls and
the whole MD specific ISA bus part is added to the sub-tree but ideally
a lot of code might be added and more shared support should grow.

Sponsored by:	Sandvine Incorporated
Reviewed by:	emaste, kib, jhb, imp
Discussed on:	arch
MFC:		3 weeks

1 files changed, 107 insertions, 0 deletions

diff --git a/sys/x86/isa/nmi.c b/sys/x86/isa/nmi.c
new file mode 100644
index 0000000..db5550c
--- /dev/null
+++ b/sys/x86/isa/nmi.c
@@ -0,0 +1,107 @@
+/*-
+ * Copyright (c) 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * 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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *	from: @(#)isa.c	7.2 (Berkeley) 5/13/91
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_mca.h"
+
+#include <sys/types.h>
+#include <sys/syslog.h>
+#include <sys/systm.h>
+
+#include <machine/md_var.h>
+
+#ifdef DEV_MCA
+#include <i386/bios/mca_machdep.h>
+#endif
+
+#define NMI_PARITY (1 << 7)
+#define NMI_IOCHAN (1 << 6)
+#define ENMI_WATCHDOG (1 << 7)
+#define ENMI_BUSTIMER (1 << 6)
+#define ENMI_IOSTATUS (1 << 5)
+
+/*
+ * Handle a NMI, possibly a machine check.
+ * return true to panic system, false to ignore.
+ */
+int
+isa_nmi(int cd)
+{
+	int retval = 0;
+	int isa_port = inb(0x61);
+	int eisa_port = inb(0x461);
+
+	log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
+#ifdef DEV_MCA
+	if (MCA_system && mca_bus_nmi())
+		return(0);
+#endif
+	
+	if (isa_port & NMI_PARITY) {
+		log(LOG_CRIT, "RAM parity error, likely hardware failure.");
+		retval = 1;
+	}
+
+	if (isa_port & NMI_IOCHAN) {
+		log(LOG_CRIT, "I/O channel check, likely hardware failure.");
+		retval = 1;
+	}
+
+	/*
+	 * On a real EISA machine, this will never happen.  However it can
+	 * happen on ISA machines which implement XT style floating point
+	 * error handling (very rare).  Save them from a meaningless panic.
+	 */
+	if (eisa_port == 0xff)
+		return(retval);
+
+	if (eisa_port & ENMI_WATCHDOG) {
+		log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
+		retval = 1;
+	}
+
+	if (eisa_port & ENMI_BUSTIMER) {
+		log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
+		retval = 1;
+	}
+
+	if (eisa_port & ENMI_IOSTATUS) {
+		log(LOG_CRIT, "EISA I/O port status error.");
+		retval = 1;
+	}
+
+	return(retval);
+}