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Diffstat (limited to 'include/iprt/memobj.h')
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diff --git a/include/iprt/memobj.h b/include/iprt/memobj.h new file mode 100644 index 00000000..e68ea046 --- /dev/null +++ b/include/iprt/memobj.h @@ -0,0 +1,795 @@ +/** @file + * IPRT - Memory Objects (Ring-0). + */ + +/* + * Copyright (C) 2006-2022 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_memobj_h +#define IPRT_INCLUDED_memobj_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_memobj RTMemObj - Memory Object Manipulation (Ring-0) + * @ingroup grp_rt + * @{ + */ + +/** @def RTMEM_TAG + * The default allocation tag used by the RTMem allocation APIs. + * + * When not defined before the inclusion of iprt/memobj.h or iprt/mem.h, this + * will default to the pointer to the current file name. The memory API will + * make of use of this as pointer to a volatile but read-only string. + */ +#ifndef RTMEM_TAG +# define RTMEM_TAG (__FILE__) +#endif + +#ifdef IN_RING0 + +/** + * Checks if this is mapping or not. + * + * @returns true if it's a mapping, otherwise false. + * @param MemObj The ring-0 memory object handle. + */ +RTR0DECL(bool) RTR0MemObjIsMapping(RTR0MEMOBJ MemObj); + +/** + * Gets the address of a ring-0 memory object. + * + * @returns The address of the memory object. + * @returns NULL if the handle is invalid (asserts in strict builds) or if there isn't any mapping. + * @param MemObj The ring-0 memory object handle. + */ +RTR0DECL(void *) RTR0MemObjAddress(RTR0MEMOBJ MemObj); + +/** + * Gets the ring-3 address of a ring-0 memory object. + * + * This only applies to ring-0 memory object with ring-3 mappings of some kind, i.e. + * locked user memory, reserved user address space and user mappings. This API should + * not be used on any other objects. + * + * @returns The address of the memory object. + * @returns NIL_RTR3PTR if the handle is invalid or if it's not an object with a ring-3 mapping. + * Strict builds will assert in both cases. + * @param MemObj The ring-0 memory object handle. + */ +RTR0DECL(RTR3PTR) RTR0MemObjAddressR3(RTR0MEMOBJ MemObj); + +/** + * Gets the size of a ring-0 memory object. + * + * The returned value may differ from the one specified to the API creating the + * object because of alignment adjustments. The minimal alignment currently + * employed by any API is PAGE_SIZE, so the result can safely be shifted by + * PAGE_SHIFT to calculate a page count. + * + * @returns The object size. + * @returns 0 if the handle is invalid (asserts in strict builds) or if there isn't any mapping. + * @param MemObj The ring-0 memory object handle. + */ +RTR0DECL(size_t) RTR0MemObjSize(RTR0MEMOBJ MemObj); + +/** + * Get the physical address of an page in the memory object. + * + * @returns The physical address. + * @returns NIL_RTHCPHYS if the object doesn't contain fixed physical pages. + * @returns NIL_RTHCPHYS if the iPage is out of range. + * @returns NIL_RTHCPHYS if the object handle isn't valid. + * @param MemObj The ring-0 memory object handle. + * @param iPage The page number within the object. + */ +RTR0DECL(RTHCPHYS) RTR0MemObjGetPagePhysAddr(RTR0MEMOBJ MemObj, size_t iPage); + +/** + * Checks whether the allocation was zero initialized or not. + * + * This only works on allocations. It is not meaningful for mappings, reserved + * memory and entered physical address, and will return false for these. + * + * @returns true if the allocation was initialized to zero at allocation time, + * false if not or query not meaningful to the object type. + * @param hMemObj The ring-0 memory object to be freed. + * + * @remarks It can be expected that memory allocated in the same fashion will + * have the same initialization state. So, if this returns true for + * one allocation it will return true for all other similarly made + * allocations. + */ +RTR0DECL(bool) RTR0MemObjWasZeroInitialized(RTR0MEMOBJ hMemObj); + +/** + * Frees a ring-0 memory object. + * + * @returns IPRT status code. + * @retval VERR_INVALID_HANDLE if + * @param MemObj The ring-0 memory object to be freed. NULL is accepted. + * @param fFreeMappings Whether or not to free mappings of the object. + */ +RTR0DECL(int) RTR0MemObjFree(RTR0MEMOBJ MemObj, bool fFreeMappings); + +/** + * Allocates page aligned virtual kernel memory (default tag). + * + * The memory is taken from a non paged (= fixed physical memory backing) pool. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + */ +#define RTR0MemObjAllocPage(pMemObj, cb, fExecutable) \ + RTR0MemObjAllocPageTag((pMemObj), (cb), (fExecutable), RTMEM_TAG) + +/** + * Allocates page aligned virtual kernel memory (custom tag). + * + * The memory is taken from a non paged (= fixed physical memory backing) pool. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocPageTag(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable, const char *pszTag); + +/** + * Allocates large page aligned virtual kernel memory (default tag). + * + * Each large page in the allocation is backed by a contiguous chunk of physical + * memory aligned to the page size. The memory is taken from a non paged (= + * fixed physical memory backing) pool. + * + * On some hosts we only support allocating a single large page at a time, they + * will return VERR_NOT_SUPPORTED if @a cb is larger than @a cbLargePage. + * + * @returns IPRT status code. + * @retval VERR_TRY_AGAIN instead of VERR_NO_MEMORY when + * RTMEMOBJ_ALLOC_LARGE_F_FAST is set and supported. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to + * nearest large page. + * @param cbLargePage The large page size. The allowed values varies from + * architecture to architecture and the paging mode + * used by the OS. + * @param fFlags Flags, RTMEMOBJ_ALLOC_LARGE_F_XXX. + * + * @note The implicit kernel mapping of this allocation does not necessarily + * have to be aligned on a @a cbLargePage boundrary. + */ +#define RTR0MemObjAllocLarge(pMemObj, cb, cbLargePage, fFlags) \ + RTR0MemObjAllocLargeTag((pMemObj), (cb), (cbLargePage), (fFlags), RTMEM_TAG) + +/** + * Allocates large page aligned virtual kernel memory (custom tag). + * + * Each large page in the allocation is backed by a contiguous chunk of physical + * memory aligned to the page size. The memory is taken from a non paged (= + * fixed physical memory backing) pool. + * + * On some hosts we only support allocating a single large page at a time, they + * will return VERR_NOT_SUPPORTED if @a cb is larger than @a cbLargePage. + * + * @returns IPRT status code. + * @retval VERR_TRY_AGAIN instead of VERR_NO_MEMORY when + * RTMEMOBJ_ALLOC_LARGE_F_FAST is set and supported. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to + * nearest large page. + * @param cbLargePage The large page size. The allowed values varies from + * architecture to architecture and the paging mode + * used by the OS. + * @param fFlags Flags, RTMEMOBJ_ALLOC_LARGE_F_XXX. + * @param pszTag Allocation tag used for statistics and such. + * + * @note The implicit kernel mapping of this allocation does not necessarily + * have to be aligned on a @a cbLargePage boundrary. + */ +RTR0DECL(int) RTR0MemObjAllocLargeTag(PRTR0MEMOBJ pMemObj, size_t cb, size_t cbLargePage, uint32_t fFlags, const char *pszTag); + +/** @name RTMEMOBJ_ALLOC_LARGE_F_XXX + * @{ */ +/** Indicates that it is okay to fail if there aren't enough large pages handy, + * cancelling any expensive search and reshuffling of memory (when supported). + * @note This flag can't be realized on all OSes. (Those who do support it + * will return VERR_TRY_AGAIN instead of VERR_NO_MEMORY if they + * cannot satisfy the request.) */ +#define RTMEMOBJ_ALLOC_LARGE_F_FAST RT_BIT_32(0) +/** Mask with valid bits. */ +#define RTMEMOBJ_ALLOC_LARGE_F_VALID_MASK UINT32_C(0x00000001) +/** @} */ + +/** + * Allocates page aligned virtual kernel memory with physical backing below 4GB + * (default tag). + * + * The physical memory backing the allocation is fixed. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + */ +#define RTR0MemObjAllocLow(pMemObj, cb, fExecutable) \ + RTR0MemObjAllocLowTag((pMemObj), (cb), (fExecutable), RTMEM_TAG) + +/** + * Allocates page aligned virtual kernel memory with physical backing below 4GB + * (custom tag). + * + * The physical memory backing the allocation is fixed. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocLowTag(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable, const char *pszTag); + +/** + * Allocates page aligned virtual kernel memory with contiguous physical backing + * below 4GB (default tag). + * + * The physical memory backing the allocation is fixed. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + */ +#define RTR0MemObjAllocCont(pMemObj, cb, fExecutable) \ + RTR0MemObjAllocContTag((pMemObj), (cb), (fExecutable), RTMEM_TAG) + +/** + * Allocates page aligned virtual kernel memory with contiguous physical backing + * below 4GB (custom tag). + * + * The physical memory backing the allocation is fixed. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param fExecutable Flag indicating whether it should be permitted to + * executed code in the memory object. The user must + * use RTR0MemObjProtect after initialization the + * allocation to actually make it executable. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocContTag(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable, const char *pszTag); + +/** + * Locks a range of user virtual memory (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param R3Ptr User virtual address. This is rounded down to a page + * boundary. + * @param cb Number of bytes to lock. This is rounded up to + * nearest page boundary. + * @param fAccess The desired access, a combination of RTMEM_PROT_READ + * and RTMEM_PROT_WRITE. + * @param R0Process The process to lock pages in. NIL_RTR0PROCESS is an + * alias for the current one. + * + * @remarks RTR0MemGetAddressR3() and RTR0MemGetAddress() will return therounded + * down address. + * + * @remarks Linux: This API requires that the memory begin locked is in a memory + * mapping that is not required in any forked off child process. This + * is not intented as permanent restriction, feel free to help out + * lifting it. + */ +#define RTR0MemObjLockUser(pMemObj, R3Ptr, cb, fAccess, R0Process) \ + RTR0MemObjLockUserTag((pMemObj), (R3Ptr), (cb), (fAccess), (R0Process), RTMEM_TAG) + +/** + * Locks a range of user virtual memory (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param R3Ptr User virtual address. This is rounded down to a page + * boundary. + * @param cb Number of bytes to lock. This is rounded up to + * nearest page boundary. + * @param fAccess The desired access, a combination of RTMEM_PROT_READ + * and RTMEM_PROT_WRITE. + * @param R0Process The process to lock pages in. NIL_RTR0PROCESS is an + * alias for the current one. + * @param pszTag Allocation tag used for statistics and such. + * + * @remarks RTR0MemGetAddressR3() and RTR0MemGetAddress() will return therounded + * down address. + * + * @remarks Linux: This API requires that the memory begin locked is in a memory + * mapping that is not required in any forked off child process. This + * is not intented as permanent restriction, feel free to help out + * lifting it. + */ +RTR0DECL(int) RTR0MemObjLockUserTag(PRTR0MEMOBJ pMemObj, RTR3PTR R3Ptr, size_t cb, uint32_t fAccess, + RTR0PROCESS R0Process, const char *pszTag); + +/** + * Locks a range of kernel virtual memory (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param pv Kernel virtual address. This is rounded down to a page boundary. + * @param cb Number of bytes to lock. This is rounded up to nearest page boundary. + * @param fAccess The desired access, a combination of RTMEM_PROT_READ + * and RTMEM_PROT_WRITE. + * + * @remark RTR0MemGetAddress() will return the rounded down address. + */ +#define RTR0MemObjLockKernel(pMemObj, pv, cb, fAccess) \ + RTR0MemObjLockKernelTag((pMemObj), (pv), (cb), (fAccess), RTMEM_TAG) + +/** + * Locks a range of kernel virtual memory (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param pv Kernel virtual address. This is rounded down to a page boundary. + * @param cb Number of bytes to lock. This is rounded up to nearest page boundary. + * @param fAccess The desired access, a combination of RTMEM_PROT_READ + * and RTMEM_PROT_WRITE. + * @param pszTag Allocation tag used for statistics and such. + * + * @remark RTR0MemGetAddress() will return the rounded down address. + */ +RTR0DECL(int) RTR0MemObjLockKernelTag(PRTR0MEMOBJ pMemObj, void *pv, size_t cb, uint32_t fAccess, const char *pszTag); + +/** + * Allocates contiguous page aligned physical memory without (necessarily) any + * kernel mapping (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + */ +#define RTR0MemObjAllocPhys(pMemObj, cb, PhysHighest) \ + RTR0MemObjAllocPhysTag((pMemObj), (cb), (PhysHighest), RTMEM_TAG) + +/** + * Allocates contiguous page aligned physical memory without (necessarily) any + * kernel mapping (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocPhysTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, const char *pszTag); + +/** + * Allocates contiguous physical memory without (necessarily) any kernel mapping + * (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M, _4M and _1G. + */ +#define RTR0MemObjAllocPhysEx(pMemObj, cb, PhysHighest, uAlignment) \ + RTR0MemObjAllocPhysExTag((pMemObj), (cb), (PhysHighest), (uAlignment), RTMEM_TAG) + +/** + * Allocates contiguous physical memory without (necessarily) any kernel mapping + * (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M, _4M and _1G. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocPhysExTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment, const char *pszTag); + +/** + * Allocates non-contiguous page aligned physical memory without (necessarily) + * any kernel mapping (default tag). + * + * This API is for allocating huge amounts of pages and will return + * VERR_NOT_SUPPORTED if this cannot be implemented in a satisfactory + * manner. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if it's not possible to allocated unmapped + * physical memory on this platform. The caller should expect + * this error and have a fallback strategy for it. + * + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + */ +#define RTR0MemObjAllocPhysNC(pMemObj, cb, PhysHighest) \ + RTR0MemObjAllocPhysNCTag((pMemObj), (cb), (PhysHighest), RTMEM_TAG) + +/** + * Allocates non-contiguous page aligned physical memory without (necessarily) + * any kernel mapping (custom tag). + * + * This API is for allocating huge amounts of pages and will return + * VERR_NOT_SUPPORTED if this cannot be implemented in a satisfactory + * manner. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if it's not possible to allocated unmapped + * physical memory on this platform. The caller should expect + * this error and have a fallback strategy for it. + * + * @param pMemObj Where to store the ring-0 memory object handle. + * @param cb Number of bytes to allocate. This is rounded up to nearest page. + * @param PhysHighest The highest permitable address (inclusive). + * Pass NIL_RTHCPHYS if any address is acceptable. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjAllocPhysNCTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, const char *pszTag); + +/** Memory cache policy for RTR0MemObjEnterPhys. + * @{ + */ +/** Default caching policy -- don't care. */ +#define RTMEM_CACHE_POLICY_DONT_CARE UINT32_C(0) +/** MMIO caching policy -- uncachable. */ +#define RTMEM_CACHE_POLICY_MMIO UINT32_C(1) +/** @} */ + +/** + * Creates a page aligned, contiguous, physical memory object (default tag). + * + * No physical memory is allocated, we trust you do know what you're doing. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param Phys The physical address to start at. This is rounded down to the + * nearest page boundary. + * @param cb The size of the object in bytes. This is rounded up to nearest page boundary. + * @param uCachePolicy One of the RTMEM_CACHE_XXX modes. + */ +#define RTR0MemObjEnterPhys(pMemObj, Phys, cb, uCachePolicy) \ + RTR0MemObjEnterPhysTag((pMemObj), (Phys), (cb), (uCachePolicy), RTMEM_TAG) + +/** + * Creates a page aligned, contiguous, physical memory object (custom tag). + * + * No physical memory is allocated, we trust you do know what you're doing. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param Phys The physical address to start at. This is rounded down to the + * nearest page boundary. + * @param cb The size of the object in bytes. This is rounded up to nearest page boundary. + * @param uCachePolicy One of the RTMEM_CACHE_XXX modes. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjEnterPhysTag(PRTR0MEMOBJ pMemObj, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy, const char *pszTag); + +/** + * Reserves kernel virtual address space (default tag). + * + * If this function fails with VERR_NOT_SUPPORTED, the idea is that you + * can use RTR0MemObjEnterPhys() + RTR0MemObjMapKernel() as a fallback if + * you have a safe physical address range to make use of... + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param cb The number of bytes to reserve. This is rounded up to nearest page. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + */ +#define RTR0MemObjReserveKernel(pMemObj, pvFixed, cb, uAlignment) \ + RTR0MemObjReserveKernelTag((pMemObj), (pvFixed), (cb), (uAlignment), RTMEM_TAG) + +/** + * Reserves kernel virtual address space (custom tag). + * + * If this function fails with VERR_NOT_SUPPORTED, the idea is that you + * can use RTR0MemObjEnterPhys() + RTR0MemObjMapKernel() as a fallback if + * you have a safe physical address range to make use of... + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param cb The number of bytes to reserve. This is rounded up to nearest page. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjReserveKernelTag(PRTR0MEMOBJ pMemObj, void *pvFixed, size_t cb, size_t uAlignment, const char *pszTag); + +/** + * Reserves user virtual address space in the current process (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param cb The number of bytes to reserve. This is rounded up to nearest PAGE_SIZE. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param R0Process The process to reserve the memory in. + * NIL_RTR0PROCESS is an alias for the current one. + */ +#define RTR0MemObjReserveUser(pMemObj, R3PtrFixed, cb, uAlignment, R0Process) \ + RTR0MemObjReserveUserTag((pMemObj), (R3PtrFixed), (cb), (uAlignment), (R0Process), RTMEM_TAG) + +/** + * Reserves user virtual address space in the current process (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param cb The number of bytes to reserve. This is rounded up to nearest PAGE_SIZE. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param R0Process The process to reserve the memory in. + * NIL_RTR0PROCESS is an alias for the current one. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjReserveUserTag(PRTR0MEMOBJ pMemObj, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, + RTR0PROCESS R0Process, const char *pszTag); + +/** + * Maps a memory object into kernel virtual address space (default tag). + * + * This is the same as calling RTR0MemObjMapKernelEx with cbSub and offSub set + * to zero. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + */ +#define RTR0MemObjMapKernel(pMemObj, MemObjToMap, pvFixed, uAlignment, fProt) \ + RTR0MemObjMapKernelTag((pMemObj), (MemObjToMap), (pvFixed), (uAlignment), (fProt), RTMEM_TAG) + +/** + * Maps a memory object into kernel virtual address space (custom tag). + * + * This is the same as calling RTR0MemObjMapKernelEx with cbSub and offSub set + * to zero. + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjMapKernelTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, void *pvFixed, + size_t uAlignment, unsigned fProt, const char *pszTag); + +/** + * Maps a memory object into kernel virtual address space (default tag). + * + * The ability to map subsections of the object into kernel space is currently + * not implemented on all platforms. All/Most of platforms supports mapping the + * whole object into kernel space. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if it's not possible to map a subsection of a + * memory object on this platform. When you hit this, try implement it. + * + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param offSub Where in the object to start mapping. If non-zero + * the value must be page aligned and cbSub must be + * non-zero as well. + * @param cbSub The size of the part of the object to be mapped. If + * zero the entire object is mapped. The value must be + * page aligned. + */ +#define RTR0MemObjMapKernelEx(pMemObj, MemObjToMap, pvFixed, uAlignment, fProt, offSub, cbSub) \ + RTR0MemObjMapKernelExTag((pMemObj), (MemObjToMap), (pvFixed), (uAlignment), (fProt), (offSub), (cbSub), RTMEM_TAG) + +/** + * Maps a memory object into kernel virtual address space (custom tag). + * + * The ability to map subsections of the object into kernel space is currently + * not implemented on all platforms. All/Most of platforms supports mapping the + * whole object into kernel space. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if it's not possible to map a subsection of a + * memory object on this platform. When you hit this, try implement it. + * + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param offSub Where in the object to start mapping. If non-zero + * the value must be page aligned and cbSub must be + * non-zero as well. + * @param cbSub The size of the part of the object to be mapped. If + * zero the entire object is mapped. The value must be + * page aligned. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjMapKernelExTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, void *pvFixed, size_t uAlignment, + unsigned fProt, size_t offSub, size_t cbSub, const char *pszTag); + +/** + * Maps a memory object into user virtual address space in the current process + * (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param R0Process The process to map the memory into. NIL_RTR0PROCESS + * is an alias for the current one. + */ +#define RTR0MemObjMapUser(pMemObj, MemObjToMap, R3PtrFixed, uAlignment, fProt, R0Process) \ + RTR0MemObjMapUserTag((pMemObj), (MemObjToMap), (R3PtrFixed), (uAlignment), (fProt), (R0Process), RTMEM_TAG) + +/** + * Maps a memory object into user virtual address space in the current process + * (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param R0Process The process to map the memory into. NIL_RTR0PROCESS + * is an alias for the current one. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjMapUserTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, RTR3PTR R3PtrFixed, + size_t uAlignment, unsigned fProt, RTR0PROCESS R0Process, const char *pszTag); + +/** + * Maps a memory object into user virtual address space in the current process + * (default tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param R0Process The process to map the memory into. NIL_RTR0PROCESS + * is an alias for the current one. + * @param offSub Where in the object to start mapping. If non-zero + * the value must be page aligned and cbSub must be + * non-zero as well. + * @param cbSub The size of the part of the object to be mapped. If + * zero the entire object is mapped. The value must be + * page aligned. + */ +#define RTR0MemObjMapUserEx(pMemObj, MemObjToMap, R3PtrFixed, uAlignment, fProt, R0Process, offSub, cbSub) \ + RTR0MemObjMapUserExTag((pMemObj), (MemObjToMap), (R3PtrFixed), (uAlignment), (fProt), (R0Process), \ + (offSub), (cbSub), RTMEM_TAG) + +/** + * Maps a memory object into user virtual address space in the current process + * (custom tag). + * + * @returns IPRT status code. + * @param pMemObj Where to store the ring-0 memory object handle of the mapping object. + * @param MemObjToMap The object to be map. + * @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment. + * @param uAlignment The alignment of the reserved memory. + * Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M. + * @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE). + * @param R0Process The process to map the memory into. NIL_RTR0PROCESS + * is an alias for the current one. + * @param offSub Where in the object to start mapping. If non-zero + * the value must be page aligned and cbSub must be + * non-zero as well. + * @param cbSub The size of the part of the object to be mapped. If + * zero the entire object is mapped. The value must be + * page aligned. + * @param pszTag Allocation tag used for statistics and such. + */ +RTR0DECL(int) RTR0MemObjMapUserExTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, RTR3PTR R3PtrFixed, size_t uAlignment, + unsigned fProt, RTR0PROCESS R0Process, size_t offSub, size_t cbSub, const char *pszTag); + +/** + * Change the page level protection of one or more pages in a memory object. + * + * @returns IPRT status code. + * @retval VERR_NOT_SUPPORTED if the OS doesn't provide any way to manipulate + * page level protection. The caller must handle this status code + * gracefully. (Note that it may also occur if the implementation is + * missing, in which case just go ahead and implement it.) + * + * @param hMemObj Memory object handle. + * @param offSub Offset into the memory object. Must be page aligned. + * @param cbSub Number of bytes to change the protection of. Must be + * page aligned. + * @param fProt Combination of RTMEM_PROT_* flags. + */ +RTR0DECL(int) RTR0MemObjProtect(RTR0MEMOBJ hMemObj, size_t offSub, size_t cbSub, uint32_t fProt); + +#endif /* IN_RING0 */ + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_memobj_h */ + |