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/*
* 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@
*/
#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)
{
OSObject * obj;
if (!super::start(provider))
return false;
if (!initHardware(provider))
return false;
fPageSize = getPageSize();
if (fIsSystem) {
sMapperLock.lock();
IOMapper::gSystem = this;
sMapperLock.wakeup(&IOMapper::gSystem);
sMapperLock.unlock();
}
if (provider)
{
obj = provider->getProperty("iommu-id");
if (!obj)
obj = provider->getProperty("AAPL,phandle");
if (obj)
setProperty(gIOMapperIDKey, obj);
}
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();
}
IOMapper * IOMapper::copyMapperForDevice(IOService * device)
{
return copyMapperForDeviceWithIndex(device, 0);
}
IOMapper * IOMapper::copyMapperForDeviceWithIndex(IOService * device, unsigned int index)
{
OSData *data;
OSObject * obj;
IOMapper * mapper = NULL;
OSDictionary * matching;
obj = device->copyProperty("iommu-parent");
if (!obj) return (NULL);
if ((mapper = OSDynamicCast(IOMapper, obj))) goto found;
if ((data = OSDynamicCast(OSData, obj)))
{
if (index >= data->getLength() / sizeof(UInt32)) goto done;
data = OSData::withBytesNoCopy((UInt32 *)data->getBytesNoCopy() + index, sizeof(UInt32));
if (!data) goto done;
matching = IOService::propertyMatching(gIOMapperIDKey, data);
data->release();
}
else
matching = IOService::propertyMatching(gIOMapperIDKey, obj);
if (matching)
{
mapper = OSDynamicCast(IOMapper, IOService::waitForMatchingService(matching));
matching->release();
}
done:
if (obj) obj->release();
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) return (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