diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/alloc-r0drv.h')
| -rw-r--r-- | src/VBox/Runtime/r0drv/alloc-r0drv.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/alloc-r0drv.h b/src/VBox/Runtime/r0drv/alloc-r0drv.h new file mode 100644 index 00000000..4383882a --- /dev/null +++ b/src/VBox/Runtime/r0drv/alloc-r0drv.h @@ -0,0 +1,111 @@ +/* $Id: alloc-r0drv.h $ */ +/** @file + * IPRT - Memory Allocation, Ring-0 Driver. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#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) +/** Use allocation method suitable for any context. */ +#define RTMEMHDR_FLAG_ANY_CTX_ALLOC RT_BIT(1) +/** Use allocation method which allow for freeing in any context. */ +#define RTMEMHDR_FLAG_ANY_CTX_FREE RT_BIT(2) +/** 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(3) +#ifdef RT_OS_LINUX +/** Linux: Allocated by kmalloc() instead of vmalloc(). */ +# define RTMEMHDR_FLAG_KMALLOC RT_BIT(31) +#elif defined(RT_OS_WINDOWS) +/** Windows: Untagged allocation by ExAllocatePool, freed using ExFreePool. */ +# define RTMEMHDR_FLAG_UNTAGGED 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 */ + |