Move ACRN Device Model code in a devicemodel/ folder

This is part of the short series of commits that will lead
to a unified repository for the ACRN hypervisor, device model
and the associated documentation.

Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>

devicemodel/core/inout.c

@@ -0,0 +1,192 @@
+/*-
+ * Copyright (c) 2011 NetApp, Inc.
+ * 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 NETAPP, INC ``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 NETAPP, INC 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <linux/uio.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+
+#include "vmm.h"
+#include "vmmapi.h"
+#include "dm.h"
+#include "inout.h"
+
+SET_DECLARE(inout_port_set, struct inout_port);
+
+#define	MAX_IOPORTS	(1 << 16)
+
+#define	VERIFY_IOPORT(port, size) \
+	assert((port) >= 0 && (size) > 0 && ((port) + (size)) <= MAX_IOPORTS)
+
+static struct {
+	const char	*name;
+	int		flags;
+	inout_func_t	handler;
+	void		*arg;
+} inout_handlers[MAX_IOPORTS];
+
+static int
+default_inout(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
+	      uint32_t *eax, void *arg)
+{
+	if (in) {
+		switch (bytes) {
+		case 4:
+			*eax = 0xffffffff;
+			break;
+		case 2:
+			*eax = 0xffff;
+			break;
+		case 1:
+			*eax = 0xff;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static void
+register_default_iohandler(int start, int size)
+{
+	struct inout_port iop;
+
+	VERIFY_IOPORT(start, size);
+
+	bzero(&iop, sizeof(iop));
+	iop.name = "default";
+	iop.port = start;
+	iop.size = size;
+	iop.flags = IOPORT_F_INOUT | IOPORT_F_DEFAULT;
+	iop.handler = default_inout;
+
+	register_inout(&iop);
+}
+
+int
+emulate_inout(struct vmctx *ctx, int *pvcpu, struct pio_request *pio_request,
+	      int strict)
+{
+	int bytes, flags, in, port;
+	inout_func_t handler;
+	void *arg;
+	int retval;
+
+	bytes = pio_request->size;
+	in = (pio_request->direction == REQUEST_READ);
+	port = pio_request->address;
+
+	assert(port < MAX_IOPORTS);
+	assert(bytes == 1 || bytes == 2 || bytes == 4);
+
+	handler = inout_handlers[port].handler;
+
+	if (strict && handler == default_inout)
+		return -1;
+
+	flags = inout_handlers[port].flags;
+	arg = inout_handlers[port].arg;
+
+	if (pio_request->direction == REQUEST_READ) {
+		if (!(flags & IOPORT_F_IN))
+			return -1;
+	} else {
+		if (!(flags & IOPORT_F_OUT))
+			return -1;
+	}
+	retval = handler(ctx, *pvcpu, in, port, bytes,
+		(uint32_t *)&(pio_request->value), arg);
+	return retval;
+}
+
+void
+init_inout(void)
+{
+	struct inout_port **iopp, *iop;
+
+	/*
+	 * Set up the default handler for all ports
+	 */
+	register_default_iohandler(0, MAX_IOPORTS);
+
+	/*
+	 * Overwrite with specified handlers
+	 */
+	SET_FOREACH(iopp, inout_port_set) {
+		iop = *iopp;
+		assert(iop->port < MAX_IOPORTS);
+		inout_handlers[iop->port].name = iop->name;
+		inout_handlers[iop->port].flags = iop->flags;
+		inout_handlers[iop->port].handler = iop->handler;
+		inout_handlers[iop->port].arg = NULL;
+	}
+}
+
+int
+register_inout(struct inout_port *iop)
+{
+	int i;
+
+	VERIFY_IOPORT(iop->port, iop->size);
+
+	/*
+	 * Verify that the new registration is not overwriting an already
+	 * allocated i/o range.
+	 */
+	if ((iop->flags & IOPORT_F_DEFAULT) == 0) {
+		for (i = iop->port; i < iop->port + iop->size; i++) {
+			if ((inout_handlers[i].flags & IOPORT_F_DEFAULT) == 0)
+				return -1;
+		}
+	}
+
+	for (i = iop->port; i < iop->port + iop->size; i++) {
+		inout_handlers[i].name = iop->name;
+		inout_handlers[i].flags = iop->flags;
+		inout_handlers[i].handler = iop->handler;
+		inout_handlers[i].arg = iop->arg;
+	}
+
+	return 0;
+}
+
+int
+unregister_inout(struct inout_port *iop)
+{
+
+	VERIFY_IOPORT(iop->port, iop->size);
+	assert(inout_handlers[iop->port].name == iop->name);
+
+	register_default_iohandler(iop->port, iop->size);
+
+	return 0;
+}