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+++ xnu/xnu-8019.41.5/iokit/Kernel/IOMapper.cpp
@@ -0,0 +1,395 @@
+/*
+ * Copyright (c) 1998-2016 Apple 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@
+ */
+
+#define IOKIT_ENABLE_SHARED_PTR
+
+#include <IOKit/IOLib.h>
+#include <IOKit/IOMapper.h>
+#include <IOKit/IODMACommand.h>
+#include <libkern/c++/OSData.h>
+#include <libkern/OSDebug.h>
+#include <mach_debug/zone_info.h>
+#include "IOKitKernelInternal.h"
+
+__BEGIN_DECLS
+extern ppnum_t pmap_find_phys(pmap_t pmap, addr64_t va);
+__END_DECLS
+
+#define super IOService
+OSDefineMetaClassAndAbstractStructors(IOMapper, IOService);
+
+OSMetaClassDefineReservedUnused(IOMapper, 0);
+OSMetaClassDefineReservedUnused(IOMapper, 1);
+OSMetaClassDefineReservedUnused(IOMapper, 2);
+OSMetaClassDefineReservedUnused(IOMapper, 3);
+OSMetaClassDefineReservedUnused(IOMapper, 4);
+OSMetaClassDefineReservedUnused(IOMapper, 5);
+OSMetaClassDefineReservedUnused(IOMapper, 6);
+OSMetaClassDefineReservedUnused(IOMapper, 7);
+OSMetaClassDefineReservedUnused(IOMapper, 8);
+OSMetaClassDefineReservedUnused(IOMapper, 9);
+OSMetaClassDefineReservedUnused(IOMapper, 10);
+OSMetaClassDefineReservedUnused(IOMapper, 11);
+OSMetaClassDefineReservedUnused(IOMapper, 12);
+OSMetaClassDefineReservedUnused(IOMapper, 13);
+OSMetaClassDefineReservedUnused(IOMapper, 14);
+OSMetaClassDefineReservedUnused(IOMapper, 15);
+
+IOMapper * IOMapper::gSystem = (IOMapper *) IOMapper::kUnknown;
+
+class IOMapperLock {
+ IOLock *fWaitLock;
+public:
+ IOMapperLock()
+ {
+ fWaitLock = IOLockAlloc();
+ }
+ ~IOMapperLock()
+ {
+ IOLockFree(fWaitLock);
+ }
+
+ void
+ lock()
+ {
+ IOLockLock(fWaitLock);
+ }
+ void
+ unlock()
+ {
+ IOLockUnlock(fWaitLock);
+ }
+ void
+ sleep(void *event)
+ {
+ IOLockSleep(fWaitLock, event, THREAD_UNINT);
+ }
+ void
+ wakeup(void *event)
+ {
+ IOLockWakeup(fWaitLock, event, false);
+ }
+};
+
+static IOMapperLock sMapperLock;
+
+bool
+IOMapper::start(IOService *provider)
+{
+ OSSharedPtr<OSObject> obj;
+ if (!super::start(provider)) {
+ return false;
+ }
+
+ if (!initHardware(provider)) {
+ return false;
+ }
+
+ uint64_t pageSize = getPageSize();
+ assert(pageSize <= UINT_MAX);
+ fPageSize = (uint32_t) pageSize;
+
+ if (fIsSystem) {
+ sMapperLock.lock();
+ IOMapper::gSystem = this;
+ sMapperLock.wakeup(&IOMapper::gSystem);
+ sMapperLock.unlock();
+ }
+
+ if (provider) {
+ obj = provider->copyProperty("iommu-id");
+ if (!obj) {
+ obj = provider->copyProperty("AAPL,phandle");
+ }
+ if (obj) {
+ setProperty(gIOMapperIDKey, obj.get());
+ }
+ }
+ return true;
+}
+
+void
+IOMapper::free()
+{
+ super::free();
+}
+
+void
+IOMapper::setMapperRequired(bool hasMapper)
+{
+ if (hasMapper) {
+ IOMapper::gSystem = (IOMapper *) kHasMapper;
+ } else {
+ sMapperLock.lock();
+ IOMapper::gSystem = (IOMapper *) kNoMapper;
+ sMapperLock.unlock();
+ sMapperLock.wakeup(&IOMapper::gSystem);
+ }
+}
+
+void
+IOMapper::waitForSystemMapper()
+{
+ sMapperLock.lock();
+ while ((uintptr_t) IOMapper::gSystem & kWaitMask) {
+ OSReportWithBacktrace("waitForSystemMapper");
+ sMapperLock.sleep(&IOMapper::gSystem);
+ }
+ sMapperLock.unlock();
+}
+
+OSSharedPtr<IOMapper>
+IOMapper::copyMapperForDevice(IOService * device)
+{
+ return copyMapperForDeviceWithIndex(device, 0);
+}
+
+OSSharedPtr<IOMapper>
+IOMapper::copyMapperForDeviceWithIndex(IOService * device, unsigned int index)
+{
+ OSSharedPtr<OSData> data;
+ OSSharedPtr<OSObject> obj;
+ OSSharedPtr<IOMapper> mapper;
+ OSSharedPtr<OSDictionary> matching;
+
+ obj = device->copyProperty("iommu-parent");
+ if (!obj) {
+ return NULL;
+ }
+
+ if ((mapper = OSDynamicPtrCast<IOMapper>(obj))) {
+ goto found;
+ }
+
+ if ((data = OSDynamicPtrCast<OSData>(obj))) {
+ if (index >= data->getLength() / sizeof(UInt32)) {
+ goto found;
+ }
+
+ data = OSData::withBytesNoCopy((UInt32 *)data->getBytesNoCopy() + index, sizeof(UInt32));
+ if (!data) {
+ goto found;
+ }
+
+ matching = IOService::propertyMatching(gIOMapperIDKey, data.get());
+ } else {
+ matching = IOService::propertyMatching(gIOMapperIDKey, obj.get());
+ }
+
+ if (matching) {
+ mapper = OSDynamicPtrCast<IOMapper>(IOService::waitForMatchingService(matching.get()));
+ }
+
+found:
+ if (mapper) {
+ if (!mapper->fAllocName) {
+ char name[MACH_ZONE_NAME_MAX_LEN];
+ char kmodname[KMOD_MAX_NAME];
+ vm_tag_t tag;
+ uint32_t kmodid;
+
+ tag = IOMemoryTag(kernel_map);
+ if (!(kmodid = vm_tag_get_kext(tag, &kmodname[0], KMOD_MAX_NAME))) {
+ snprintf(kmodname, sizeof(kmodname), "%d", tag);
+ }
+ snprintf(name, sizeof(name), "%s.DMA.%s", kmodname, device->getName());
+ mapper->fAllocName = kern_allocation_name_allocate(name, 16);
+ }
+ }
+
+ return mapper;
+}
+
+__BEGIN_DECLS
+
+// These are C accessors to the system mapper for non-IOKit clients
+ppnum_t
+IOMapperIOVMAlloc(unsigned pages)
+{
+ IOReturn ret;
+ uint64_t dmaAddress, dmaLength;
+
+ IOMapper::checkForSystemMapper();
+
+ ret = kIOReturnUnsupported;
+ if (IOMapper::gSystem) {
+ ret = IOMapper::gSystem->iovmMapMemory(
+ NULL, 0, ptoa_64(pages),
+ (kIODMAMapReadAccess | kIODMAMapWriteAccess),
+ NULL, NULL, NULL,
+ &dmaAddress, &dmaLength);
+ }
+
+ if (kIOReturnSuccess == ret) {
+ uint64_t dmaAddressPage64;
+ dmaAddressPage64 = atop_64(dmaAddress);
+ if (dmaAddressPage64 > UINT_MAX) {
+ return 0;
+ }
+ return (ppnum_t) atop_64(dmaAddress);
+ }
+ return 0;
+}
+
+void
+IOMapperIOVMFree(ppnum_t addr, unsigned pages)
+{
+ if (IOMapper::gSystem) {
+ IOMapper::gSystem->iovmUnmapMemory(NULL, NULL, ptoa_64(addr), ptoa_64(pages));
+ }
+}
+
+ppnum_t
+IOMapperInsertPage(ppnum_t addr, unsigned offset, ppnum_t page)
+{
+ if (!IOMapper::gSystem) {
+ return page;
+ }
+ if (!addr) {
+ panic("!addr");
+ }
+ IOMapper::gSystem->iovmInsert((kIODMAMapReadAccess | kIODMAMapWriteAccess),
+ ptoa_64(addr), ptoa_64(offset), ptoa_64(page), ptoa_64(1));
+ return addr + offset;
+}
+
+/////////////////////////////////////////////////////////////////////////////
+//
+//
+// IOLib.h APIs
+//
+//
+/////////////////////////////////////////////////////////////////////////////
+
+#include <machine/machine_routines.h>
+
+UInt8
+IOMappedRead8(IOPhysicalAddress address)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ return (UInt8) ml_phys_read_byte_64(addr);
+ } else {
+ return (UInt8) ml_phys_read_byte((vm_offset_t) address);
+ }
+}
+
+UInt16
+IOMappedRead16(IOPhysicalAddress address)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ return (UInt16) ml_phys_read_half_64(addr);
+ } else {
+ return (UInt16) ml_phys_read_half((vm_offset_t) address);
+ }
+}
+
+UInt32
+IOMappedRead32(IOPhysicalAddress address)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ return (UInt32) ml_phys_read_word_64(addr);
+ } else {
+ return (UInt32) ml_phys_read_word((vm_offset_t) address);
+ }
+}
+
+UInt64
+IOMappedRead64(IOPhysicalAddress address)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ return (UInt64) ml_phys_read_double_64(addr);
+ } else {
+ return (UInt64) ml_phys_read_double((vm_offset_t) address);
+ }
+}
+
+void
+IOMappedWrite8(IOPhysicalAddress address, UInt8 value)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ ml_phys_write_byte_64(addr, value);
+ } else {
+ ml_phys_write_byte((vm_offset_t) address, value);
+ }
+}
+
+void
+IOMappedWrite16(IOPhysicalAddress address, UInt16 value)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ ml_phys_write_half_64(addr, value);
+ } else {
+ ml_phys_write_half((vm_offset_t) address, value);
+ }
+}
+
+void
+IOMappedWrite32(IOPhysicalAddress address, UInt32 value)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ ml_phys_write_word_64(addr, value);
+ } else {
+ ml_phys_write_word((vm_offset_t) address, value);
+ }
+}
+
+void
+IOMappedWrite64(IOPhysicalAddress address, UInt64 value)
+{
+ IOMapper::checkForSystemMapper();
+
+ if (IOMapper::gSystem) {
+ addr64_t addr = IOMapper::gSystem->mapToPhysicalAddress(address);
+ ml_phys_write_double_64(addr, value);
+ } else {
+ ml_phys_write_double((vm_offset_t) address, value);
+ }
+}
+
+__END_DECLS