init gnumach copy

1 files changed, 365 insertions, 0 deletions

diff --git a/kern/ipc_kobject.c b/kern/ipc_kobject.c
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+++ b/kern/ipc_kobject.c
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ */
+/*
+ *	File:	kern/ipc_kobject.c
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Functions for letting a port represent a kernel object.
+ */
+
+#include <kern/debug.h>
+#include <kern/printf.h>
+#include <mach/port.h>
+#include <mach/kern_return.h>
+#include <mach/message.h>
+#include <mach/mig_errors.h>
+#include <mach/notify.h>
+#include <kern/ipc_kobject.h>
+#include <ipc/ipc_object.h>
+#include <ipc/ipc_kmsg.h>
+#include <ipc/ipc_port.h>
+#include <ipc/ipc_thread.h>
+#include <vm/vm_object.h>
+#include <vm/memory_object_proxy.h>
+#include <device/ds_routines.h>
+
+#include <kern/mach.server.h>
+#include <ipc/mach_port.server.h>
+#include <kern/mach_host.server.h>
+#include <device/device.server.h>
+#include <device/device_pager.server.h>
+#include <kern/mach4.server.h>
+#include <kern/gnumach.server.h>
+#include <kern/experimental.server.h>
+
+#if MACH_DEBUG
+#include <kern/mach_debug.server.h>
+#endif
+
+#if	MACH_MACHINE_ROUTINES
+#include <machine/machine_routines.h>
+#include MACHINE_SERVER_HEADER
+#endif
+
+
+/*
+ *	Routine:	ipc_kobject_server
+ *	Purpose:
+ *		Handle a message sent to the kernel.
+ *		Generates a reply message.
+ *	Conditions:
+ *		Nothing locked.
+ */
+
+ipc_kmsg_t
+ipc_kobject_server(ipc_kmsg_t request)
+{
+	mach_msg_size_t reply_size = ikm_less_overhead(8192);
+	ipc_kmsg_t reply;
+	kern_return_t kr;
+	mig_routine_t routine;
+	ipc_port_t *destp;
+
+	reply = ikm_alloc(reply_size);
+	if (reply == IKM_NULL) {
+		printf("ipc_kobject_server: dropping request\n");
+		ipc_kmsg_destroy(request);
+		return IKM_NULL;
+	}
+	ikm_init(reply, reply_size);
+
+	/*
+	 * Initialize reply message.
+	 */
+	{
+#define	InP	((mach_msg_header_t *) &request->ikm_header)
+#define	OutP	((mig_reply_header_t *) &reply->ikm_header)
+
+	    static const mach_msg_type_t RetCodeType = {
+	        .msgt_name = MACH_MSG_TYPE_INTEGER_32,
+	        .msgt_size = 32,
+	        .msgt_number = 1,
+	        .msgt_inline = TRUE,
+	        .msgt_longform = FALSE,
+	        .msgt_deallocate = FALSE,
+	        .msgt_unused = 0
+	    };
+	    OutP->Head.msgh_bits =
+		MACH_MSGH_BITS(MACH_MSGH_BITS_LOCAL(InP->msgh_bits), 0);
+	    OutP->Head.msgh_size = sizeof(mig_reply_header_t);
+	    OutP->Head.msgh_remote_port = InP->msgh_local_port;
+	    OutP->Head.msgh_local_port  = MACH_PORT_NULL;
+	    OutP->Head.msgh_seqno = 0;
+	    OutP->Head.msgh_id = InP->msgh_id + 100;
+#if 0
+	    if (InP->msgh_id) {
+		    static long _calls;
+		    static struct { long id, count; } _counts[512];
+		    int i, id;
+
+		    id = InP->msgh_id;
+		    for (i = 0; i < 511; i++) {
+			    if (_counts[i].id == 0) {
+				    _counts[i].id = id;
+				    _counts[i].count++;
+				    break;
+			    }
+			    if (_counts[i].id == id) {
+				    _counts[i].count++;
+				    break;
+			    }
+		    }
+		    if (i == 511) {
+			    _counts[i].id = id;
+			    _counts[i].count++;
+		    }
+		    if ((++_calls & 0x7fff) == 0)
+			    for (i = 0; i < 512; i++) {
+				    if (_counts[i].id == 0)
+					    break;
+				    printf("%d: %d\n",
+					   _counts[i].id, _counts[i].count);
+			    }
+	    }
+#endif
+
+	    OutP->RetCodeType = RetCodeType;
+
+#undef	InP
+#undef	OutP
+	}
+
+	/*
+	 * Find the server routine to call, and call it
+	 * to perform the kernel function
+	 */
+    {
+	check_simple_locks();
+	if ((routine = mach_server_routine(&request->ikm_header)) != 0
+	 || (routine = mach_port_server_routine(&request->ikm_header)) != 0
+	 || (routine = mach_host_server_routine(&request->ikm_header)) != 0
+	 || (routine = device_server_routine(&request->ikm_header)) != 0
+	 || (routine = device_pager_server_routine(&request->ikm_header)) != 0
+#if	MACH_DEBUG
+	 || (routine = mach_debug_server_routine(&request->ikm_header)) != 0
+#endif	/* MACH_DEBUG */
+	 || (routine = mach4_server_routine(&request->ikm_header)) != 0
+	 || (routine = gnumach_server_routine(&request->ikm_header)) != 0
+	 || (routine = experimental_server_routine(&request->ikm_header)) != 0
+#if	MACH_MACHINE_ROUTINES
+	 || (routine = MACHINE_SERVER_ROUTINE(&request->ikm_header)) != 0
+#endif	/* MACH_MACHINE_ROUTINES */
+	) {
+	    (*routine)(&request->ikm_header, &reply->ikm_header);
+	    kernel_task->messages_received++;
+	} else {
+	    if (!ipc_kobject_notify(&request->ikm_header,
+		&reply->ikm_header)) {
+		((mig_reply_header_t *) &reply->ikm_header)->RetCode
+		    = MIG_BAD_ID;
+#if	MACH_IPC_TEST
+		printf("ipc_kobject_server: bogus kernel message, id=%d\n",
+		       request->ikm_header.msgh_id);
+#endif	/* MACH_IPC_TEST */
+	    } else {
+		kernel_task->messages_received++;
+	    }
+	}
+	kernel_task->messages_sent++;
+    }
+	check_simple_locks();
+
+	/*
+	 *	Destroy destination. The following code differs from
+	 *	ipc_object_destroy in that we release the send-once
+	 *	right instead of generating a send-once notification
+	 * 	(which would bring us here again, creating a loop).
+	 *	It also differs in that we only expect send or
+	 *	send-once rights, never receive rights.
+	 *
+	 *	We set msgh_remote_port to IP_NULL so that the kmsg
+	 *	destroy routines don't try to destroy the port twice.
+	 */
+	destp = (ipc_port_t *) &request->ikm_header.msgh_remote_port;
+	switch (MACH_MSGH_BITS_REMOTE(request->ikm_header.msgh_bits)) {
+		case MACH_MSG_TYPE_PORT_SEND:
+		ipc_port_release_send(*destp);
+		break;
+
+		case MACH_MSG_TYPE_PORT_SEND_ONCE:
+		ipc_port_release_sonce(*destp);
+		break;
+
+		default:
+#if MACH_ASSERT
+		assert(!"ipc_object_destroy: strange destination rights");
+#else
+		panic("ipc_object_destroy: strange destination rights");
+#endif
+	}
+	*destp = IP_NULL;
+
+	kr = ((mig_reply_header_t *) &reply->ikm_header)->RetCode;
+	if ((kr == KERN_SUCCESS) || (kr == MIG_NO_REPLY)) {
+		/*
+		 *	The server function is responsible for the contents
+		 *	of the message.  The reply port right is moved
+		 *	to the reply message, and we have deallocated
+		 *	the destination port right, so we just need
+		 *	to free the kmsg.
+		 */
+
+		/* like ipc_kmsg_put, but without the copyout */
+
+		ikm_check_initialized(request, request->ikm_size);
+		ikm_cache_free(request);
+	} else {
+		/*
+		 *	The message contents of the request are intact.
+		 *	Destroy everything except the reply port right,
+		 *	which is needed in the reply message.
+		 */
+
+		request->ikm_header.msgh_local_port = MACH_PORT_NULL;
+		ipc_kmsg_destroy(request);
+	}
+
+	if (kr == MIG_NO_REPLY) {
+		/*
+		 *	The server function will send a reply message
+		 *	using the reply port right, which it has saved.
+		 */
+
+		ikm_free(reply);
+		return IKM_NULL;
+	} else if (!IP_VALID((ipc_port_t)reply->ikm_header.msgh_remote_port)) {
+		/*
+		 *	Can't queue the reply message if the destination
+		 *	(the reply port) isn't valid.
+		 */
+
+		ipc_kmsg_destroy(reply);
+		return IKM_NULL;
+	}
+
+	return reply;
+}
+
+/*
+ *	Routine:	ipc_kobject_set
+ *	Purpose:
+ *		Make a port represent a kernel object of the given type.
+ *		The caller is responsible for handling refs for the
+ *		kernel object, if necessary.
+ *	Conditions:
+ *		Nothing locked.  The port must be active.
+ */
+
+void
+ipc_kobject_set(ipc_port_t port, ipc_kobject_t kobject, ipc_kobject_type_t type)
+{
+	ip_lock(port);
+	assert(ip_active(port));
+	port->ip_bits = (port->ip_bits &~ IO_BITS_KOTYPE) | type;
+	port->ip_kobject = kobject;
+	ip_unlock(port);
+}
+
+/*
+ *	Routine:	ipc_kobject_destroy
+ *	Purpose:
+ *		Release any kernel object resources associated
+ *		with the port, which is being destroyed.
+ *
+ *		This should only be needed when resources are
+ *		associated with a user's port.  In the normal case,
+ *		when the kernel is the receiver, the code calling
+ *		ipc_port_dealloc_kernel should clean up the resources.
+ *	Conditions:
+ *		The port is not locked, but it is dead.
+ */
+
+void
+ipc_kobject_destroy(
+	ipc_port_t	port)
+{
+	switch (ip_kotype(port)) {
+	    case IKOT_PAGER:
+		vm_object_destroy(port);
+		break;
+
+	    case IKOT_PAGER_TERMINATING:
+		vm_object_pager_wakeup(port);
+		break;
+
+	    default:
+#if	MACH_ASSERT
+		printf("ipc_kobject_destroy: port 0x%p, kobj 0x%zd, type %d\n",
+		       port, port->ip_kobject, ip_kotype(port));
+#endif	/* MACH_ASSERT */
+		break;
+	}
+}
+
+/*
+ *	Routine:	ipc_kobject_notify
+ *	Purpose:
+ *		Deliver notifications to kobjects that care about them.
+ */
+
+boolean_t
+ipc_kobject_notify(mach_msg_header_t *request_header,
+	mach_msg_header_t *reply_header)
+{
+	ipc_port_t port = (ipc_port_t) request_header->msgh_remote_port;
+
+	((mig_reply_header_t *) reply_header)->RetCode = MIG_NO_REPLY;
+	switch (request_header->msgh_id) {
+		case MACH_NOTIFY_PORT_DELETED:
+		case MACH_NOTIFY_MSG_ACCEPTED:
+		case MACH_NOTIFY_PORT_DESTROYED:
+		case MACH_NOTIFY_NO_SENDERS:
+		case MACH_NOTIFY_SEND_ONCE:
+		case MACH_NOTIFY_DEAD_NAME:
+		break;
+
+		default:
+		return FALSE;
+	}
+	switch (ip_kotype(port)) {
+		case IKOT_DEVICE:
+		return ds_notify(request_header);
+
+		case IKOT_PAGER_PROXY:
+		return memory_object_proxy_notify(request_header);
+
+		default:
+		return FALSE;
+	}
+}