[1] | 1 | /* |
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| 2 | * kmem.h - kernel unified memory allocator interface |
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| 3 | * |
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[635] | 4 | * Authors Alain Greiner (2016,2017,2018,2019) |
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[1] | 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #ifndef _KMEM_H_ |
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| 25 | #define _KMEM_H_ |
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| 26 | |
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[457] | 27 | #include <hal_kernel_types.h> |
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[1] | 28 | #include <kcm.h> |
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| 29 | |
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| 30 | /************************************************************************************* |
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[656] | 31 | * This enum defines the three Kernel Memory Allocaror types |
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[1] | 32 | ************************************************************************************/ |
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| 33 | |
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| 34 | enum |
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| 35 | { |
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[635] | 36 | KMEM_PPM = 0, /*! PPM allocator */ |
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| 37 | KMEM_KCM = 1, /*! KCM allocator */ |
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| 38 | KMEM_KHM = 2, /*! KHM allocator */ |
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[1] | 39 | }; |
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| 40 | |
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| 41 | /************************************************************************************* |
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[18] | 42 | * This defines the generic Allocation Flags that can be associated to |
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[1] | 43 | * a Kernel Memory Request. |
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| 44 | ************************************************************************************/ |
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| 45 | |
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| 46 | #define AF_NONE 0x0000 // no attributes |
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[18] | 47 | #define AF_KERNEL 0x0001 // for kernel use |
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[1] | 48 | #define AF_ZERO 0x0002 // must be reset to 0 |
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| 49 | |
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| 50 | /************************************************************************************* |
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[18] | 51 | * This structure defines a Kernel Memory Request. |
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[1] | 52 | ************************************************************************************/ |
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| 53 | |
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| 54 | typedef struct kmem_req_s |
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| 55 | { |
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[635] | 56 | uint32_t type; /*! KMEM_PPM / KMEM_KCM / KMEM_KHM */ |
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| 57 | uint32_t order; /*! PPM: ln2(pages) / KCM: ln2(bytes) / KHM: bytes */ |
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[1] | 58 | uint32_t flags; /*! request attributes */ |
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| 59 | void * ptr; /*! local pointer on allocated buffer (only used by free) */ |
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[18] | 60 | } |
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[1] | 61 | kmem_req_t; |
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| 62 | |
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| 63 | /************************************************************************************* |
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[635] | 64 | * These two functions allocate physical memory in a local or remote cluster |
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| 65 | * as specified by the kmem_req_t request descriptor, and return a local pointer |
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| 66 | * on the allocated buffer. It uses three specialised physical memory allocators: |
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| 67 | * - PPM (Physical Pages Manager) allocates N contiguous small physical pages. |
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| 68 | * N is a power of 2, and req.order = ln(N). Implement the buddy algorithm. |
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| 69 | * - KCM (Kernel Cache Manager) allocates aligned blocks of M bytes from a cache. |
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| 70 | * M is a power of 2, and req.order = ln( M ). One cache per block size. |
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| 71 | * - KHM (Kernel Heap Manager) allocates physical memory buffers of M bytes, |
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| 72 | * M can have any value, and req.order = M. |
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[656] | 73 | * |
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| 74 | * WARNING: the physical memory allocated with a given allocator type must be |
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| 75 | * released using the same allocator type. |
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[1] | 76 | ************************************************************************************* |
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[635] | 77 | * @ cxy : target cluster identifier for a remote access. |
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| 78 | * @ req : local pointer on allocation request. |
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| 79 | * @ return local pointer on allocated buffer if success / return NULL if no memory. |
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[1] | 80 | ************************************************************************************/ |
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| 81 | void * kmem_alloc( kmem_req_t * req ); |
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| 82 | |
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[635] | 83 | void * kmem_remote_alloc( cxy_t cxy, |
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| 84 | kmem_req_t * req ); |
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| 85 | |
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[1] | 86 | /************************************************************************************* |
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[635] | 87 | * These two functions release previously allocated physical memory, as specified |
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| 88 | * by the <type> and <ptr> fields of the kmem_req_t request descriptor. |
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[1] | 89 | ************************************************************************************* |
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[635] | 90 | * @ cxy : target cluster identifier for a remote access. |
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[1] | 91 | * @ req : local pointer to request descriptor. |
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| 92 | ************************************************************************************/ |
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| 93 | void kmem_free ( kmem_req_t * req ); |
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| 94 | |
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[635] | 95 | void kmem_remote_free( cxy_t cxy, |
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| 96 | kmem_req_t * req ); |
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[1] | 97 | |
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[7] | 98 | |
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[1] | 99 | #endif /* _KMEM_H_ */ |
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