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/* $Id: alloc-r0drv.h $ */
/** @file
* IPRT - Memory Allocation, Ring-0 Driver.
*/
/*
* 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.
*/
#ifndef IPRT_INCLUDED_SRC_r0drv_alloc_r0drv_h
#define IPRT_INCLUDED_SRC_r0drv_alloc_r0drv_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/cdefs.h>
#include <iprt/types.h>
#include <iprt/mem.h>
#include "internal/magics.h"
RT_C_DECLS_BEGIN
/**
* Header which heading all memory blocks.
*/
typedef struct RTMEMHDR
{
/** Magic (RTMEMHDR_MAGIC). */
uint32_t u32Magic;
/** Block flags (RTMEMHDR_FLAG_*). */
uint32_t fFlags;
/** The actual size of the block, header not included. */
uint32_t cb;
/** The requested allocation size. */
uint32_t cbReq;
} RTMEMHDR, *PRTMEMHDR;
/** @name RTMEMHDR::fFlags.
* @{ */
/** Clear the allocated memory. */
#define RTMEMHDR_FLAG_ZEROED RT_BIT(0)
/** Executable flag. */
#define RTMEMHDR_FLAG_EXEC RT_BIT(1)
/** Use allocation method suitable for any context. */
#define RTMEMHDR_FLAG_ANY_CTX_ALLOC RT_BIT(2)
/** Use allocation method which allow for freeing in any context. */
#define RTMEMHDR_FLAG_ANY_CTX_FREE RT_BIT(3)
/** Both alloc and free in any context (or we're just darn lazy). */
#define RTMEMHDR_FLAG_ANY_CTX (RTMEMHDR_FLAG_ANY_CTX_ALLOC | RTMEMHDR_FLAG_ANY_CTX_FREE)
/** Indicate that it was allocated by rtR0MemAllocExTag. */
#define RTMEMHDR_FLAG_ALLOC_EX RT_BIT(4)
#ifdef RT_OS_LINUX
/** Linux: Allocated using vm_area hacks. */
# define RTMEMHDR_FLAG_EXEC_VM_AREA RT_BIT(29)
/** Linux: Allocated from the special heap for executable memory. */
# define RTMEMHDR_FLAG_EXEC_HEAP RT_BIT(30)
/** Linux: Allocated by kmalloc() instead of vmalloc(). */
# define RTMEMHDR_FLAG_KMALLOC RT_BIT(31)
#endif
/** @} */
/**
* Heap allocation back end for ring-0.
*
* @returns IPRT status code. VERR_NO_MEMORY suffices for RTMEMHDR_FLAG_EXEC,
* the caller will change it to VERR_NO_EXEC_MEMORY when appropriate.
*
* @param cb The amount of memory requested by the user. This does
* not include the header.
* @param fFlags The allocation flags and more. These should be
* assigned to RTMEMHDR::fFlags together with any flags
* the backend might be using.
* @param ppHdr Where to return the memory header on success.
*/
DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr);
/**
* Free memory allocated by rtR0MemAllocEx.
* @param pHdr The memory block to free. (Never NULL.)
*/
DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr);
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_SRC_r0drv_alloc_r0drv_h */
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