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/* $Id: alloc-r0drv-darwin.cpp $ */
/** @file
* IPRT - Memory Allocation, Ring-0 Driver, Darwin.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#pragma GCC diagnostic ignored "-Wdeprecated-declarations" /* (IOMallocContiguous et al are deprecated) */
#include "the-darwin-kernel.h"
#include "internal/iprt.h"
#include <iprt/mem.h>
#include <iprt/memobj.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/thread.h>
#include "r0drv/alloc-r0drv.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* Extended header used for headers marked with RTMEMHDR_FLAG_EXEC.
*
* This is used with allocating executable memory, for things like generated
* code and loaded modules.
*/
typedef struct RTMEMDARWINHDREX
{
/** The associated memory object. */
RTR0MEMOBJ hMemObj;
/** Alignment padding. */
uint8_t abPadding[ARCH_BITS == 32 ? 12 : 8];
/** The header we present to the generic API. */
RTMEMHDR Hdr;
} RTMEMDARWINHDREX;
AssertCompileSize(RTMEMDARWINHDREX, 32);
/** Pointer to an extended memory header. */
typedef RTMEMDARWINHDREX *PRTMEMDARWINHDREX;
/**
* OS specific allocation function.
*/
DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
{
IPRT_DARWIN_SAVE_EFL_AC();
if (RT_UNLIKELY(fFlags & RTMEMHDR_FLAG_ANY_CTX))
return VERR_NOT_SUPPORTED;
PRTMEMHDR pHdr;
if (fFlags & RTMEMHDR_FLAG_EXEC)
{
RTR0MEMOBJ hMemObj;
int rc = RTR0MemObjAllocPage(&hMemObj, cb + sizeof(RTMEMDARWINHDREX), true /*fExecutable*/);
if (RT_FAILURE(rc))
{
IPRT_DARWIN_RESTORE_EFL_AC();
return rc;
}
PRTMEMDARWINHDREX pExHdr = (PRTMEMDARWINHDREX)RTR0MemObjAddress(hMemObj);
pExHdr->hMemObj = hMemObj;
pHdr = &pExHdr->Hdr;
#if 1 /*fExecutable isn't currently honored above. */
rc = RTR0MemObjProtect(hMemObj, 0, RTR0MemObjSize(hMemObj), RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC);
AssertRC(rc);
#endif
}
else
{
pHdr = (PRTMEMHDR)IOMalloc(cb + sizeof(*pHdr));
if (RT_UNLIKELY(!pHdr))
{
printf("rtR0MemAllocEx(%#zx, %#x) failed\n", cb + sizeof(*pHdr), fFlags);
IPRT_DARWIN_RESTORE_EFL_AC();
return VERR_NO_MEMORY;
}
}
pHdr->u32Magic = RTMEMHDR_MAGIC;
pHdr->fFlags = fFlags;
pHdr->cb = cb;
pHdr->cbReq = cb;
*ppHdr = pHdr;
IPRT_DARWIN_RESTORE_EFL_AC();
return VINF_SUCCESS;
}
/**
* OS specific free function.
*/
DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr)
{
IPRT_DARWIN_SAVE_EFL_AC();
pHdr->u32Magic += 1;
if (pHdr->fFlags & RTMEMHDR_FLAG_EXEC)
{
PRTMEMDARWINHDREX pExHdr = RT_FROM_MEMBER(pHdr, RTMEMDARWINHDREX, Hdr);
int rc = RTR0MemObjFree(pExHdr->hMemObj, false /*fFreeMappings*/);
AssertRC(rc);
}
else
IOFree(pHdr, pHdr->cb + sizeof(*pHdr));
IPRT_DARWIN_RESTORE_EFL_AC();
}
RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
{
/*
* validate input.
*/
AssertPtr(pPhys);
Assert(cb > 0);
RT_ASSERT_PREEMPTIBLE();
IPRT_DARWIN_SAVE_EFL_AC();
/*
* Allocate the memory and ensure that the API is still providing
* memory that's always below 4GB.
*/
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
IOPhysicalAddress PhysAddr;
void *pv = IOMallocContiguous(cb, PAGE_SIZE, &PhysAddr);
if (pv)
{
if (PhysAddr + (cb - 1) <= (IOPhysicalAddress)0xffffffff)
{
if (!((uintptr_t)pv & PAGE_OFFSET_MASK))
{
*pPhys = PhysAddr;
IPRT_DARWIN_RESTORE_EFL_AC();
return pv;
}
AssertMsgFailed(("IOMallocContiguous didn't return a page aligned address - %p!\n", pv));
}
else
AssertMsgFailed(("IOMallocContiguous returned high address! PhysAddr=%RX64 cb=%#zx\n", (uint64_t)PhysAddr, cb));
IOFreeContiguous(pv, cb);
}
IPRT_DARWIN_RESTORE_EFL_AC();
return NULL;
}
RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
{
RT_ASSERT_PREEMPTIBLE();
if (pv)
{
Assert(cb > 0);
AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
IPRT_DARWIN_SAVE_EFL_AC();
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
IOFreeContiguous(pv, cb);
IPRT_DARWIN_RESTORE_EFL_AC();
}
}
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