/** @file * IPRT - Memory Management and Manipulation. */ /* * Copyright (C) 2006-2007 Sun Microsystems, Inc. * * 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. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ #ifndef ___iprt_mem_h #define ___iprt_mem_h #include #include #ifdef IN_GC # error "There are no RTMem APIs available Guest Context!" #endif __BEGIN_DECLS /** @defgroup grp_rt_mem RTMem - Memory Management and Manipulation * @ingroup grp_rt * @{ */ /** @def RTMEM_ALIGNMENT * The alignment of the memory blocks returned by RTMemAlloc(), RTMemAllocZ(), * RTMemRealloc(), RTMemTmpAlloc() and RTMemTmpAllocZ() for allocations greater * than RTMEM_ALIGNMENT. */ #define RTMEM_ALIGNMENT 8 /** * Allocates temporary memory. * * Temporary memory blocks are used for not too large memory blocks which * are believed not to stick around for too long. Using this API instead * of RTMemAlloc() not only gives the heap manager room for optimization * but makes the code easier to read. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocated. */ RTDECL(void *) RTMemTmpAlloc(size_t cb); /** * Allocates zero'ed temporary memory. * * Same as RTMemTmpAlloc() but the memory will be zero'ed. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocated. */ RTDECL(void *) RTMemTmpAllocZ(size_t cb); /** * Free temporary memory. * * @param pv Pointer to memory block. */ RTDECL(void) RTMemTmpFree(void *pv); /** * Allocates memory. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocated. */ RTDECL(void *) RTMemAlloc(size_t cb); /** * Allocates zero'ed memory. * * Instead of memset(pv, 0, sizeof()) use this when you want zero'ed * memory. This keeps the code smaller and the heap can skip the memset * in about 0.42% of calls :-). * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocated. */ RTDECL(void *) RTMemAllocZ(size_t cb); /** * Duplicates a chunk of memory into a new heap block. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cb The amount of memory to duplicate. */ RTDECL(void *) RTMemDup(const void *pvSrc, size_t cb); /** * Duplicates a chunk of memory into a new heap block with some * additional zeroed memory. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cbSrc The amount of memory to duplicate. * @param cbExtra The amount of extra memory to allocate and zero. */ RTDECL(void *) RTMemDupEx(const void *pvSrc, size_t cbSrc, size_t cbExtra); /** * Reallocates memory. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param pvOld The memory block to reallocate. * @param cbNew The new block size (in bytes). */ RTDECL(void *) RTMemRealloc(void *pvOld, size_t cbNew); /** * Free memory related to an virtual machine * * @param pv Pointer to memory block. */ RTDECL(void) RTMemFree(void *pv); /** * Allocates memory which may contain code. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemExecAlloc(size_t cb); /** * Free executable/read/write memory allocated by RTMemExecAlloc(). * * @param pv Pointer to memory block. */ RTDECL(void) RTMemExecFree(void *pv); #if defined(IN_RING0) && defined(RT_ARCH_AMD64) && defined(RT_OS_LINUX) /** * Donate read+write+execute memory to the exec heap. * * This API is specific to AMD64 and Linux/GNU. A kernel module that desires to * use RTMemExecAlloc on AMD64 Linux/GNU will have to donate some statically * allocated memory in the module if it wishes for GCC generated code to work. * GCC can only generate modules that work in the address range ~2GB to ~0 * currently. * * The API only accept one single donation. * * @returns IPRT status code. * @param pvMemory Pointer to the memory block. * @param cb The size of the memory block. */ RTR0DECL(int) RTR0MemExecDonate(void *pvMemory, size_t cb); #endif /* R0+AMD64+LINUX */ /** * Allocate page aligned memory. * * @returns Pointer to the allocated memory. * @returns NULL if we're out of memory. * @param cb Size of the memory block. Will be rounded up to page size. */ RTDECL(void *) RTMemPageAlloc(size_t cb); /** * Allocate zero'ed page aligned memory. * * @returns Pointer to the allocated memory. * @returns NULL if we're out of memory. * @param cb Size of the memory block. Will be rounded up to page size. */ RTDECL(void *) RTMemPageAllocZ(size_t cb); /** * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ(). * * @param pv Pointer to the block as it was returned by the allocation function. * NULL will be ignored. */ RTDECL(void) RTMemPageFree(void *pv); /** Page level protection flags for RTMemProtect(). * @{ */ /** Read access. */ #define RTMEM_PROT_NONE 0 /** Read access. */ #define RTMEM_PROT_READ 1 /** Write access. */ #define RTMEM_PROT_WRITE 2 /** Execute access. */ #define RTMEM_PROT_EXEC 4 /** @} */ /** * Change the page level protection of a memory region. * * @returns iprt status code. * @param pv Start of the region. Will be rounded down to nearest page boundary. * @param cb Size of the region. Will be rounded up to the nearest page boundary. * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines. */ RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect); #ifdef IN_RING0 /** * Allocates physical contiguous memory (below 4GB). * The allocation is page aligned and the content is undefined. * * @returns Pointer to the memory block. This is page aligned. * @param pPhys Where to store the physical address. * @param cb The allocation size in bytes. This is always * rounded up to PAGE_SIZE. */ RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb); /** * Frees memory allocated ysing RTMemContAlloc(). * * @param pv Pointer to return from RTMemContAlloc(). * @param cb The cb parameter passed to RTMemContAlloc(). */ RTR0DECL(void) RTMemContFree(void *pv, size_t cb); #endif /** @name Electrical Fence Version of some APIs. * @{ */ /** * Same as RTMemTmpAlloc() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfTmpAlloc(size_t cb); /** * Same as RTMemTmpAllocZ() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfTmpAllocZ(size_t cb); /** * Same as RTMemTmpFree() except that it's for fenced memory. * * @param pv Pointer to memory block. */ RTDECL(void) RTMemEfTmpFree(void *pv); /** * Same as RTMemAlloc() except that it's fenced. * * @returns Pointer to the allocated memory. Free with RTMemEfFree(). * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfAlloc(size_t cb); /** * Same as RTMemAllocZ() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfAllocZ(size_t cb); /** * Same as RTMemRealloc() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param pvOld The memory block to reallocate. * @param cbNew The new block size (in bytes). */ RTDECL(void *) RTMemEfRealloc(void *pvOld, size_t cbNew); /** * Free memory allocated by any of the RTMemEf* allocators. * * @param pv Pointer to memory block. */ RTDECL(void) RTMemEfFree(void *pv); /** * Same as RTMemDup() except that it's fenced. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cb The amount of memory to duplicate. */ RTDECL(void *) RTMemEfDup(const void *pvSrc, size_t cb); /** * Same as RTMemEfDupEx except that it's fenced. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cbSrc The amount of memory to duplicate. * @param cbExtra The amount of extra memory to allocate and zero. */ RTDECL(void *) RTMemEfDupEx(const void *pvSrc, size_t cbSrc, size_t cbExtra); /** @def RTMEM_WRAP_TO_EF_APIS * Define RTMEM_WRAP_TO_EF_APIS to wrap RTMem APIs to RTMemEf APIs. */ #ifdef RTMEM_WRAP_TO_EF_APIS # define RTMemTmpAlloc RTMemEfTmpAlloc # define RTMemTmpAllocZ RTMemEfTmpAllocZ # define RTMemTmpFree RTMemEfTmpFree # define RTMemAlloc RTMemEfAlloc # define RTMemAllocZ RTMemEfAllocZ # define RTMemRealloc RTMemEfRealloc # define RTMemFree RTMemEfFree # define RTMemDup RTMemEfDup # define RTMemDupEx RTMemEfDupEx #endif #ifdef DOXYGEN_RUNNING # define RTMEM_WRAP_TO_EF_APIS #endif /** @} */ /** @} */ __END_DECLS #endif