xref: /xnu-12377.1.9/osfmk/device/iokit_rpc.c (revision f6217f891ac0bb64f3d375211650a4c1ff8ca1ea)

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#include <mach/boolean.h>
#include <mach/kern_return.h>
#include <mach/mig_errors.h>
#include <mach/port.h>
#include <mach/vm_param.h>
#include <mach/notify.h>
#include <mach/mach_types.h>

#include <machine/machparam.h>          /* spl definitions */

#include <ipc/ipc_space.h>

#include <kern/clock.h>
#include <kern/spl.h>
#include <kern/queue.h>
#include <kern/zalloc.h>
#include <kern/thread.h>
#include <kern/task.h>
#include <kern/sched_prim.h>
#include <kern/misc_protos.h>

#include <vm/pmap.h>
#include <vm/vm_map_xnu.h>
#include <vm/vm_kern.h>

#include <device/device_types.h>
#include <device/device_port.h>
#include <device/device_server.h>

#include <machine/machparam.h>

#if defined(__i386__) || defined(__x86_64__)
#include <i386/pmap.h>
#endif
#if defined(__arm64__)
#include <arm/pmap.h>
#endif
#include <IOKit/IOKitServer.h>

#define EXTERN
#define MIGEXTERN

/*
 * Lifetime:
 * - non lazy port with no-more senders
 * - the object is not stable because of IOUserClient::destroyUserReferences(),
 *   which can kill the port even when there are outstanding send rights.
 */
IPC_KOBJECT_DEFINE(IKOT_IOKIT_IDENT,
    .iko_op_movable_send = true,
    .iko_op_no_senders = iokit_ident_no_senders);
IPC_KOBJECT_DEFINE(IKOT_IOKIT_OBJECT,
    .iko_op_movable_send = true,
    .iko_op_no_senders = iokit_object_no_senders);
IPC_KOBJECT_DEFINE(IKOT_IOKIT_CONNECT,
    .iko_op_no_senders = iokit_connect_no_senders);
IPC_KOBJECT_DEFINE(IKOT_UEXT_OBJECT,
    .iko_op_movable_send = true,
    .iko_op_no_senders = iokit_uext_no_senders,
    .iko_op_label_free = ipc_kobject_label_free);

/*
 * Lookup a device by its port.
 * Doesn't consume the naked send right; produces a device reference.
 */
EXTERN io_object_t
iokit_lookup_io_object(ipc_port_t port, ipc_kobject_type_t type)
{
	io_object_t  obj = NULL;
	io_kobject_t kobj = NULL;

	if (!IP_VALID(port)) {
		return NULL;
	}

	ip_mq_lock(port);
	kobj = ipc_kobject_get_locked(port, type);
	if (kobj) {
		iokit_kobject_retain(kobj);
	}
	ip_mq_unlock(port);
	if (kobj) {
		obj = iokit_copy_object_for_consumed_kobject(kobj);
	}

	return obj;
}

MIGEXTERN io_object_t
iokit_lookup_object_port(ipc_port_t port)
{
	return iokit_lookup_io_object(port, IKOT_IOKIT_OBJECT);
}

MIGEXTERN io_object_t
iokit_lookup_connect_port(ipc_port_t port)
{
	return iokit_lookup_io_object(port, IKOT_IOKIT_CONNECT);
}

MIGEXTERN io_object_t
iokit_lookup_ident_port(ipc_port_t port)
{
	return iokit_lookup_io_object(port, IKOT_IOKIT_IDENT);
}

MIGEXTERN io_object_t
iokit_lookup_uext_object_port(ipc_port_t port)
{
	return iokit_lookup_io_object(port, IKOT_UEXT_OBJECT);
}

static io_object_t
iokit_lookup_object_in_space_with_port_name(mach_port_name_t name, ipc_kobject_type_t type, ipc_space_t space)
{
	io_object_t obj = NULL;
	io_kobject_t kobj;

	if (MACH_PORT_VALID(name)) {
		ipc_port_t port;
		kern_return_t kr;

		kr = ipc_port_translate_send(space, name, &port);

		if (kr == KERN_SUCCESS) {
			assert(IP_VALID(port));
			assert(ip_active(port));
			kobj = ipc_kobject_get_locked(port, type);
			if (kobj) {
				iokit_kobject_retain(kobj);
			}
			ip_mq_unlock(port);
			if (kobj) {
				obj = iokit_copy_object_for_consumed_kobject(kobj);
			}
		}
	}

	return obj;
}

EXTERN io_object_t
iokit_lookup_object_with_port_name(mach_port_name_t name, ipc_kobject_type_t type, task_t task)
{
	return iokit_lookup_object_in_space_with_port_name(name, type, task->itk_space);
}

EXTERN io_object_t
iokit_lookup_connect_ref_current_task(mach_port_name_t name)
{
	return iokit_lookup_object_in_space_with_port_name(name, IKOT_IOKIT_CONNECT, current_space());
}

EXTERN io_object_t
iokit_lookup_uext_ref_current_task(mach_port_name_t name)
{
	return iokit_lookup_object_in_space_with_port_name(name, IKOT_UEXT_OBJECT, current_space());
}

/*
 * Look up a port given a port name.
 * This returns the port unlocked with a +1 send right.
 * Release with iokit_release_port_send()
 */
EXTERN kern_return_t
iokit_lookup_raw_current_task(mach_port_name_t name, ipc_kobject_type_t type, ipc_port_t *portp)
{
	kern_return_t kr;
	ipc_port_t port;

	/*
	 * Backward compatbility
	 *
	 * We can't use ipc_typed_port_copyin_send() builtin's capability to
	 * check type here, because of legacy reasons.
	 *
	 * type mismatch used to be returned as kIOReturnBadArgument to callers,
	 * but other cases of errors would yield kIOReturnNotFound.
	 *
	 * Do the dance by hand to respect this past.
	 */
	if (MACH_PORT_VALID(name)) {
		kr = ipc_typed_port_copyin_send(current_space(), name,
		    IOT_ANY, &port);

		if (kr != KERN_SUCCESS || !IP_VALID(port)) {
			return kIOReturnNotFound;
		}

		if (type != IOT_ANY && ip_type(port) != type) {
			ipc_typed_port_release_send(port, IOT_ANY);
			return kIOReturnBadArgument;
		}

		*portp = port;
		return kIOReturnSuccess;
	}

	return kIOReturnNotFound;
}

EXTERN void
iokit_release_port_send( ipc_port_t port )
{
	ipc_port_release_send( port );
}

/*
 * Get the port for a device.
 * Consumes a device reference; produces a naked send right.
 */

static ipc_port_t
iokit_make_port_of_type(io_object_t obj, ipc_kobject_type_t type)
{
	ipc_port_t sendPort = IP_NULL;

	if (obj != NULL) {
		sendPort = iokit_port_make_send_for_object(obj, type);
		iokit_remove_reference( obj );
	}

	return sendPort;
}

MIGEXTERN ipc_port_t
iokit_make_object_port( io_object_t obj )
{
	return iokit_make_port_of_type(obj, IKOT_IOKIT_OBJECT);
}

MIGEXTERN ipc_port_t
iokit_make_connect_port( io_object_t obj )
{
	return iokit_make_port_of_type(obj, IKOT_IOKIT_CONNECT);
}

MIGEXTERN ipc_port_t
iokit_make_ident_port( io_object_t obj )
{
	return iokit_make_port_of_type(obj, IKOT_IOKIT_IDENT);
}

EXTERN ipc_port_t
iokit_alloc_object_port( io_kobject_t obj, ipc_kobject_type_t type )
{
	/* Allocate port, keeping a reference for it. */
	ipc_kobject_alloc_options_t options = IPC_KOBJECT_ALLOC_NONE;
	ipc_object_label_t label = IPC_OBJECT_LABEL(type);

	if (type == IKOT_UEXT_OBJECT) {
		label = ipc_kobject_label_alloc(IKOT_UEXT_OBJECT,
		    IPC_LABEL_DEXT, IP_NULL);
	}
	return ipc_kobject_alloc_port(obj, label, options);
}

EXTERN void
iokit_lock_port( ipc_port_t port )
{
	ip_mq_lock(port);
}

EXTERN void
iokit_unlock_port( ipc_port_t port )
{
	ip_mq_unlock(port);
}

EXTERN void
iokit_destroy_object_port( ipc_port_t port, ipc_kobject_type_t type )
{
	ipc_kobject_dealloc_port(port, IPC_KOBJECT_NO_MSCOUNT, type);
}

EXTERN ipc_kobject_type_t
iokit_port_type(ipc_port_t port)
{
	return ip_type(port);
}

EXTERN mach_port_name_t
iokit_make_send_right( task_t task, io_object_t obj, ipc_kobject_type_t type )
{
	ipc_port_t          sendPort;
	mach_port_name_t    name = 0;

	if (obj == NULL) {
		return MACH_PORT_NULL;
	}

	sendPort = iokit_port_make_send_for_object( obj, type );

	if (IP_VALID( sendPort )) {
		kern_return_t   kr;
		// Remove once <rdar://problem/45522961> is fixed.
		// We need to make ith_knote NULL as ipc_object_copyout() uses
		// thread-argument-passing and its value should not be garbage
		current_thread()->ith_knote = ITH_KNOTE_NULL;
		kr = ipc_object_copyout( task->itk_space, sendPort,
		    MACH_MSG_TYPE_PORT_SEND, IPC_OBJECT_COPYOUT_FLAGS_NONE,
		    NULL, &name);
		if (kr != KERN_SUCCESS) {
			name = MACH_PORT_NULL;
		}
	} else if (sendPort == IP_NULL) {
		name = MACH_PORT_NULL;
	} else if (sendPort == IP_DEAD) {
		name = MACH_PORT_DEAD;
	}

	return name;
}

EXTERN kern_return_t
iokit_mod_send_right( task_t task, mach_port_name_t name, mach_port_delta_t delta )
{
	return mach_port_mod_refs( task->itk_space, name, MACH_PORT_RIGHT_SEND, delta );
}

kern_return_t
iokit_label_dext_task(task_t task)
{
	return ipc_space_add_label(task->itk_space, IPC_LABEL_DEXT);
}

/*
 *	Routine:	iokit_clear_registered_ports
 *	Purpose:
 *		Clean up a task's registered IOKit kobject ports.
 *	Conditions:
 *		Nothing locked.
 */
void
iokit_clear_registered_ports(
	task_t task)
{
	mach_port_t port;
	ipc_kobject_type_t type;

	itk_lock(task);
	for (int i = 0; i < TASK_PORT_REGISTER_MAX; i++) {
		port = task->itk_registered[i];
		if (!IP_VALID(port)) {
			continue;
		}
		type = ip_type( port );
		if ((IKOT_IOKIT_OBJECT == type)
		    || (IKOT_IOKIT_CONNECT == type)
		    || (IKOT_IOKIT_IDENT == type)
		    || (IKOT_UEXT_OBJECT == type)) {
			ipc_port_release_send(port);
			task->itk_registered[i] = IP_NULL;
		}
	}
	itk_unlock(task);
}

/* need to create a pmap function to generalize */
unsigned int
IODefaultCacheBits(addr64_t pa)
{
	return pmap_cache_attributes((ppnum_t)(pa >> PAGE_SHIFT));
}

kern_return_t
IOMapPages(vm_map_t map, mach_vm_address_t va, mach_vm_address_t pa,
    mach_vm_size_t length, unsigned int options)
{
	vm_prot_t    prot;
	unsigned int flags;
	ppnum_t      pagenum;
	pmap_t       pmap = map->pmap;

	prot = (options & kIOMapReadOnly)
	    ? VM_PROT_READ : (VM_PROT_READ | VM_PROT_WRITE);

	pagenum = (ppnum_t)atop_64(pa);

	switch (options & kIOMapCacheMask) {                    /* What cache mode do we need? */
	case kIOMapDefaultCache:
	default:
		flags = IODefaultCacheBits(pa);
		break;

	case kIOMapInhibitCache:
		flags = VM_WIMG_IO;
		break;

	case kIOMapWriteThruCache:
		flags = VM_WIMG_WTHRU;
		break;

	case kIOMapWriteCombineCache:
		flags = VM_WIMG_WCOMB;
		break;

	case kIOMapCopybackCache:
		flags = VM_WIMG_COPYBACK;
		break;

	case kIOMapCopybackInnerCache:
		flags = VM_WIMG_INNERWBACK;
		break;

	case kIOMapPostedWrite:
		flags = VM_WIMG_POSTED;
		break;

	case kIOMapRealTimeCache:
		flags = VM_WIMG_RT;
		break;
	}

	pmap_set_cache_attributes(pagenum, flags);

	vm_map_set_cache_attr(map, (vm_map_offset_t)va);


	// Set up a block mapped area
	return pmap_map_block(pmap, va, pagenum, (uint32_t) atop_64(round_page_64(length)), prot, 0, 0);
}

kern_return_t
IOUnmapPages(vm_map_t map, mach_vm_address_t va, mach_vm_size_t length)
{
	pmap_t      pmap = map->pmap;

	pmap_remove(pmap, trunc_page_64(va), round_page_64(va + length));

	return KERN_SUCCESS;
}

kern_return_t
IOProtectCacheMode(vm_map_t __unused map, mach_vm_address_t __unused va,
    mach_vm_size_t __unused length, unsigned int __unused options)
{
	mach_vm_size_t off;
	vm_prot_t      prot;
	unsigned int   flags;
	pmap_t         pmap = map->pmap;
	pmap_flush_context  pmap_flush_context_storage;
	boolean_t           delayed_pmap_flush = FALSE;

	prot = (options & kIOMapReadOnly)
	    ? VM_PROT_READ : (VM_PROT_READ | VM_PROT_WRITE);

	switch (options & kIOMapCacheMask) {
	// what cache mode do we need?
	case kIOMapDefaultCache:
	default:
		return KERN_INVALID_ARGUMENT;

	case kIOMapInhibitCache:
		flags = VM_WIMG_IO;
		break;

	case kIOMapWriteThruCache:
		flags = VM_WIMG_WTHRU;
		break;

	case kIOMapWriteCombineCache:
		flags = VM_WIMG_WCOMB;
		break;

	case kIOMapCopybackCache:
		flags = VM_WIMG_COPYBACK;
		break;

	case kIOMapCopybackInnerCache:
		flags = VM_WIMG_INNERWBACK;
		break;

	case kIOMapPostedWrite:
		flags = VM_WIMG_POSTED;
		break;

	case kIOMapRealTimeCache:
		flags = VM_WIMG_RT;
		break;
	}

	pmap_flush_context_init(&pmap_flush_context_storage);
	delayed_pmap_flush = FALSE;

	//  enter each page's physical address in the target map
	for (off = 0; off < length; off += page_size) {
		ppnum_t ppnum = pmap_find_phys(pmap, va + off);
		if (ppnum) {
			pmap_enter_options(pmap, va + off, ppnum, prot, VM_PROT_NONE, flags, TRUE,
			    PMAP_OPTIONS_NOFLUSH, (void *)&pmap_flush_context_storage, PMAP_MAPPING_TYPE_INFER);
			delayed_pmap_flush = TRUE;
		}
	}
	if (delayed_pmap_flush == TRUE) {
		pmap_flush(&pmap_flush_context_storage);
	}

	return KERN_SUCCESS;
}

ppnum_t
IOGetLastPageNumber(void)
{
#if __i386__ || __x86_64__
	ppnum_t  lastPage, highest = 0;
	unsigned int idx;

	for (idx = 0; idx < pmap_memory_region_count; idx++) {
		lastPage = pmap_memory_regions[idx].end - 1;
		if (lastPage > highest) {
			highest = lastPage;
		}
	}
	return highest;
#elif __arm64__
	return 0;
#else
#error unknown arch
#endif
}


void IOGetTime( mach_timespec_t * clock_time);
void
IOGetTime( mach_timespec_t * clock_time)
{
	clock_sec_t sec;
	clock_nsec_t nsec;
	clock_get_system_nanotime(&sec, &nsec);
	clock_time->tv_sec = (typeof(clock_time->tv_sec))sec;
	clock_time->tv_nsec = nsec;
}