xnu-344.49.tar.gz

[apple/xnu.git] / iokit / Kernel / IOLib.c

/*
 * Copyright (c) 1998-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_LICENSE_HEADER_END@
 */
/*
 * HISTORY
 *
 * 17-Apr-91   Portions from libIO.m, Doug Mitchell at NeXT.
 * 17-Nov-98   cpp
 *
 */

#include <IOKit/system.h>
#include <mach/sync_policy.h>
#include <machine/machine_routines.h>
#include <libkern/c++/OSCPPDebug.h>

#include <IOKit/assert.h>

#include <IOKit/IOReturn.h>
#include <IOKit/IOLib.h> 
#include <IOKit/IOKitDebug.h> 

mach_timespec_t IOZeroTvalspec = { 0, 0 };


/*
 * Global variables for use by iLogger
 * These symbols are for use only by Apple diagnostic code.
 * Binary compatibility is not guaranteed for kexts that reference these symbols.
 */

void *_giDebugLogInternal       = NULL;
void *_giDebugLogDataInternal   = NULL;
void *_giDebugReserved1         = NULL;
void *_giDebugReserved2         = NULL;


/*
 * Static variables for this module.
 */

static IOThreadFunc threadArgFcn;
static void * threadArgArg;
static lock_t * threadArgLock;


enum { kIOMaxPageableMaps = 16 };
enum { kIOPageableMapSize = 16 * 1024 * 1024 };
enum { kIOPageableMaxMapSize = 64 * 1024 * 1024 };

typedef struct {
    vm_map_t    map;
    vm_offset_t address;
    vm_offset_t end;
} IOMapData;

static struct {
    UInt32      count;
    UInt32      hint;
    IOMapData   maps[ kIOMaxPageableMaps ];
    mutex_t *   lock;
} gIOKitPageableSpace;


void IOLibInit(void)
{
    kern_return_t ret;

    static bool libInitialized;

    if(libInitialized)
        return; 

    threadArgLock = lock_alloc( true, NULL, NULL );

    gIOKitPageableSpace.maps[0].address = 0;
    ret = kmem_suballoc(kernel_map,
                    &gIOKitPageableSpace.maps[0].address,
                    kIOPageableMapSize,
                    TRUE,
                    TRUE,
                    &gIOKitPageableSpace.maps[0].map);
    if (ret != KERN_SUCCESS)
        panic("failed to allocate iokit pageable map\n");

    gIOKitPageableSpace.lock            = mutex_alloc( 0 );
    gIOKitPageableSpace.maps[0].end     = gIOKitPageableSpace.maps[0].address + kIOPageableMapSize;
    gIOKitPageableSpace.hint            = 0;
    gIOKitPageableSpace.count           = 1;

    libInitialized = true;
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * We pass an argument to a new thread by saving fcn and arg in some
 * locked variables and starting the thread at ioThreadStart(). This
 * function retrives fcn and arg and makes the appropriate call.
 *
 */

static void ioThreadStart( void )
{
    IOThreadFunc        fcn;
    void *              arg;

    fcn = threadArgFcn;
    arg = threadArgArg;
    lock_done( threadArgLock);

    (*fcn)(arg);

    IOExitThread();
}

IOThread IOCreateThread(IOThreadFunc fcn, void *arg)
{
        IOThread thread;

        lock_write( threadArgLock);
        threadArgFcn = fcn;
        threadArgArg = arg;

        thread = kernel_thread( kernel_task, ioThreadStart);

        return(thread);
}


volatile void IOExitThread()
{
        (void) thread_terminate(current_act());
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */


void * IOMalloc(vm_size_t size)
{
    void * address;

    address = (void *)kalloc(size);
#if IOALLOCDEBUG
    if (address)
        debug_iomalloc_size += size;
#endif
    return address;
}

void IOFree(void * address, vm_size_t size)
{
    if (address) {
        kfree((vm_offset_t)address, size);
#if IOALLOCDEBUG
        debug_iomalloc_size -= size;
#endif
    }
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

void * IOMallocAligned(vm_size_t size, vm_size_t alignment)
{
    kern_return_t       kr;
    vm_address_t        address;
    vm_address_t        allocationAddress;
    vm_size_t           adjustedSize;
    vm_offset_t         alignMask;

    if (size == 0)
        return 0;
    if (alignment == 0) 
        alignment = 1;

    alignMask = alignment - 1;
    adjustedSize = size + sizeof(vm_size_t) + sizeof(vm_address_t);

    if (adjustedSize >= page_size) {

        kr = kernel_memory_allocate(kernel_map, &address,
                                        size, alignMask, 0);
        if (KERN_SUCCESS != kr)
            address = 0;

    } else {

        adjustedSize += alignMask;

        if (adjustedSize >= page_size) {

            kr = kernel_memory_allocate(kernel_map, &allocationAddress,
                                            adjustedSize, 0, 0);
            if (KERN_SUCCESS != kr)
                allocationAddress = 0;

        } else
            allocationAddress = (vm_address_t) kalloc(adjustedSize);

        if (allocationAddress) {
            address = (allocationAddress + alignMask
                    + (sizeof(vm_size_t) + sizeof(vm_address_t)))
                    & (~alignMask);

            *((vm_size_t *)(address - sizeof(vm_size_t)
                            - sizeof(vm_address_t))) = adjustedSize;
            *((vm_address_t *)(address - sizeof(vm_address_t)))
                            = allocationAddress;
        } else
            address = 0;
    }

    assert(0 == (address & alignMask));

#if IOALLOCDEBUG
    if( address)
        debug_iomalloc_size += size;
#endif

    return (void *) address;
}

void IOFreeAligned(void * address, vm_size_t size)
{
    vm_address_t        allocationAddress;
    vm_size_t           adjustedSize;

    if( !address)
        return;

    assert(size);

    adjustedSize = size + sizeof(vm_size_t) + sizeof(vm_address_t);
    if (adjustedSize >= page_size) {

        kmem_free( kernel_map, (vm_address_t) address, size);

    } else {
        adjustedSize = *((vm_size_t *)( (vm_address_t) address
                                - sizeof(vm_address_t) - sizeof(vm_size_t)));
        allocationAddress = *((vm_address_t *)( (vm_address_t) address
                                - sizeof(vm_address_t) ));

        if (adjustedSize >= page_size)
            kmem_free( kernel_map, (vm_address_t) allocationAddress, adjustedSize);
        else
            kfree((vm_offset_t) allocationAddress, adjustedSize);
    }

#if IOALLOCDEBUG
    debug_iomalloc_size -= size;
#endif
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

void * IOMallocContiguous(vm_size_t size, vm_size_t alignment,
                           IOPhysicalAddress * physicalAddress)
{
    kern_return_t       kr;
    vm_address_t        address;
    vm_address_t        allocationAddress;
    vm_size_t           adjustedSize;
    vm_offset_t         alignMask;

    if (size == 0)
        return 0;
    if (alignment == 0) 
        alignment = 1;

    alignMask = alignment - 1;
    adjustedSize = (2 * size) + sizeof(vm_size_t) + sizeof(vm_address_t);

    if (adjustedSize >= page_size) {

        kr = kmem_alloc_contig(kernel_map, &address, size,
                                alignMask, 0);
        if (KERN_SUCCESS != kr)
            address = 0;

    } else {

        adjustedSize += alignMask;
        allocationAddress = (vm_address_t) kalloc(adjustedSize);

        if (allocationAddress) {

            address = (allocationAddress + alignMask
                    + (sizeof(vm_size_t) + sizeof(vm_address_t)))
                    & (~alignMask);

            if (atop(address) != atop(address + size - 1))
                address = round_page(address);

            *((vm_size_t *)(address - sizeof(vm_size_t)
                            - sizeof(vm_address_t))) = adjustedSize;
            *((vm_address_t *)(address - sizeof(vm_address_t)))
                            = allocationAddress;
        } else
            address = 0;
    }

    if( address && physicalAddress)
        *physicalAddress = (IOPhysicalAddress) pmap_extract( kernel_pmap,
                                                                 address );

    assert(0 == (address & alignMask));

#if IOALLOCDEBUG
    if( address)
        debug_iomalloc_size += size;
#endif

    return (void *) address;
}

void IOFreeContiguous(void * address, vm_size_t size)
{
    vm_address_t        allocationAddress;
    vm_size_t           adjustedSize;

    if( !address)
        return;

    assert(size);

    adjustedSize = (2 * size) + sizeof(vm_size_t) + sizeof(vm_address_t);
    if (adjustedSize >= page_size) {

        kmem_free( kernel_map, (vm_address_t) address, size);

    } else {
        adjustedSize = *((vm_size_t *)( (vm_address_t) address
                                - sizeof(vm_address_t) - sizeof(vm_size_t)));
        allocationAddress = *((vm_address_t *)( (vm_address_t) address
                                - sizeof(vm_address_t) ));

        kfree((vm_offset_t) allocationAddress, adjustedSize);
    }

#if IOALLOCDEBUG
    debug_iomalloc_size -= size;
#endif
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

typedef kern_return_t (*IOIteratePageableMapsCallback)(vm_map_t map, void * ref);

kern_return_t IOIteratePageableMaps(vm_size_t size,
                    IOIteratePageableMapsCallback callback, void * ref)
{
    kern_return_t       kr = kIOReturnNotReady;
    vm_size_t           segSize;
    UInt32              attempts;
    UInt32              index;
    vm_offset_t         min;
    vm_map_t            map;

    if (size > kIOPageableMaxMapSize)
        return( kIOReturnBadArgument );

    do {
        index = gIOKitPageableSpace.hint;
        attempts = gIOKitPageableSpace.count;
        while( attempts--) {
            kr = (*callback)(gIOKitPageableSpace.maps[index].map, ref);
            if( KERN_SUCCESS == kr) {
                gIOKitPageableSpace.hint = index;
                break;
            }
            if( index)
                index--;
            else
                index = gIOKitPageableSpace.count - 1;
        }
        if( KERN_SUCCESS == kr)
            break;

        mutex_lock( gIOKitPageableSpace.lock );

        index = gIOKitPageableSpace.count;
        if( index >= (kIOMaxPageableMaps - 1)) {
            mutex_unlock( gIOKitPageableSpace.lock );
            break;
        }

        if( size < kIOPageableMapSize)
            segSize = kIOPageableMapSize;
        else
            segSize = size;

        min = 0;
        kr = kmem_suballoc(kernel_map,
                    &min,
                    segSize,
                    TRUE,
                    TRUE,
                    &map);
        if( KERN_SUCCESS != kr) {
            mutex_unlock( gIOKitPageableSpace.lock );
            break;
        }

        gIOKitPageableSpace.maps[index].map     = map;
        gIOKitPageableSpace.maps[index].address = min;
        gIOKitPageableSpace.maps[index].end     = min + segSize;
        gIOKitPageableSpace.hint                = index;
        gIOKitPageableSpace.count               = index + 1;

        mutex_unlock( gIOKitPageableSpace.lock );

    } while( true );

    return kr;
}

struct IOMallocPageableRef
{
    vm_address_t address;
    vm_size_t    size;
};

static kern_return_t IOMallocPageableCallback(vm_map_t map, void * _ref)
{
    struct IOMallocPageableRef * ref = (struct IOMallocPageableRef *) _ref;
    kern_return_t                kr;

    kr = kmem_alloc_pageable( map, &ref->address, ref->size );

    return( kr );
}

void * IOMallocPageable(vm_size_t size, vm_size_t alignment)
{
    kern_return_t              kr = kIOReturnNotReady;
    struct IOMallocPageableRef ref;

    if (alignment > page_size)
        return( 0 );
    if (size > kIOPageableMaxMapSize)
        return( 0 );

    ref.size = size;
    kr = IOIteratePageableMaps( size, &IOMallocPageableCallback, &ref );
    if( kIOReturnSuccess != kr)
        ref.address = 0;

#if IOALLOCDEBUG
    if( ref.address)
       debug_iomalloc_size += round_page(size);
#endif

    return( (void *) ref.address );
}

vm_map_t IOPageableMapForAddress( vm_address_t address )
{
    vm_map_t    map = 0;
    UInt32      index;
    
    for( index = 0; index < gIOKitPageableSpace.count; index++) {
        if( (address >= gIOKitPageableSpace.maps[index].address)
         && (address < gIOKitPageableSpace.maps[index].end) ) {
            map = gIOKitPageableSpace.maps[index].map;
            break;
        }
    }
    if( !map)
        IOPanic("IOPageableMapForAddress: null");

    return( map );
}

void IOFreePageable(void * address, vm_size_t size)
{
    vm_map_t map;
    
    map = IOPageableMapForAddress( (vm_address_t) address);
    if( map)
        kmem_free( map, (vm_offset_t) address, size);

#if IOALLOCDEBUG
    debug_iomalloc_size -= round_page(size);
#endif
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

extern kern_return_t IOMapPages(vm_map_t map, vm_offset_t va, vm_offset_t pa,
                        vm_size_t length, unsigned int options);

IOReturn IOSetProcessorCacheMode( task_t task, IOVirtualAddress address,
                                  IOByteCount length, IOOptionBits cacheMode )
{
    IOReturn    ret = kIOReturnSuccess;
    vm_offset_t physAddr;

    if( task != kernel_task)
        return( kIOReturnUnsupported );

    length = round_page(address + length) - trunc_page( address );
    address = trunc_page( address );

    // make map mode
    cacheMode = (cacheMode << kIOMapCacheShift) & kIOMapCacheMask;

    while( (kIOReturnSuccess == ret) && (length > 0) ) {

        physAddr = pmap_extract( kernel_pmap, address );
        if( physAddr)
            ret = IOMapPages( get_task_map(task), address, physAddr, page_size, cacheMode );
        else
            ret = kIOReturnVMError;

        length -= page_size;
    }

    return( ret );
}


IOReturn IOFlushProcessorCache( task_t task, IOVirtualAddress address,
                                  IOByteCount length )
{
    if( task != kernel_task)
        return( kIOReturnUnsupported );

#if __ppc__
    flush_dcache( (vm_offset_t) address, (unsigned) length, false );
#endif

    return( kIOReturnSuccess );
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

SInt32 OSKernelStackRemaining( void )
{
   SInt32 stack;

   stack = (((SInt32) &stack) & (KERNEL_STACK_SIZE - 1));

   return( stack );
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

void IOSleep(unsigned milliseconds)
{
    wait_result_t wait_result;

    wait_result = assert_wait_timeout(milliseconds, THREAD_UNINT);
    assert(wait_result == THREAD_WAITING);

    wait_result = thread_block(THREAD_CONTINUE_NULL);
    assert(wait_result == THREAD_TIMED_OUT);
}

/*
 * Spin for indicated number of microseconds.
 */
void IODelay(unsigned microseconds)
{
    extern void delay(int usec);

    delay(microseconds);
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

void IOLog(const char *format, ...)
{
        va_list ap;
        extern void conslog_putc(char);
        extern void logwakeup();

        va_start(ap, format);
        _doprnt(format, &ap, conslog_putc, 16);
        va_end(ap);
}

void IOPanic(const char *reason)
{
        panic(reason);
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Convert a integer constant (typically a #define or enum) to a string.
 */
static char noValue[80];        // that's pretty

const char *IOFindNameForValue(int value, const IONamedValue *regValueArray)
{
        for( ; regValueArray->name; regValueArray++) {
                if(regValueArray->value == value)
                        return(regValueArray->name);
        }
        sprintf(noValue, "0x%x (UNDEFINED)", value);
        return((const char *)noValue);
}

IOReturn IOFindValueForName(const char *string, 
        const IONamedValue *regValueArray,
        int *value)
{
        for( ; regValueArray->name; regValueArray++) {
                if(!strcmp(regValueArray->name, string)) {
                        *value = regValueArray->value;
                        return kIOReturnSuccess;
                }
        }
        return kIOReturnBadArgument;
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

IOAlignment IOSizeToAlignment(unsigned int size)
{
    register int shift;
    const int intsize = sizeof(unsigned int) * 8;
    
    for (shift = 1; shift < intsize; shift++) {
        if (size & 0x80000000)
            return (IOAlignment)(intsize - shift);
        size <<= 1;
    }
    return 0;
}

unsigned int IOAlignmentToSize(IOAlignment align)
{
    unsigned int size;
    
    for (size = 1; align; align--) {
        size <<= 1;
    }
    return size;
}

IOReturn IONDRVLibrariesInitialize( void )
{
    return( kIOReturnUnsupported );
}