| 1 | /* |
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| 2 | * kmem.h - unified kernel memory allocator definition |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2016,2017,2018,2019,2020) |
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| 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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| 27 | #include <hal_kernel_types.h> |
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| 28 | #include <kcm.h> |
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| 29 | |
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| 30 | /************************************************************************************* |
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| 31 | * This defines the generic Allocation Flags that can be associated to |
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| 32 | * a Kernel Memory Request. |
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| 33 | ************************************************************************************/ |
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| 34 | |
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| 35 | #define AF_NONE 0x0000 // no attributes |
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| 36 | #define AF_KERNEL 0x0001 // for kernel use ??? |
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| 37 | #define AF_ZERO 0x0002 // data buffer must be reset to 0 |
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| 38 | |
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| 39 | /************************************************************************************* |
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| 40 | * These two functions allocate physical memory in a local or remote cluster |
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| 41 | * as specified by the <cxy>, <order> and <flags> arguments, and return a local |
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| 42 | * pointer on the allocated buffer. The buffer size (in bytes) is a power of 2, |
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| 43 | * equal to (1 << order) bytes. It can be initialized to zero if requested. |
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| 44 | * Depending on the <order> value, it uses two specialised allocators: |
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| 45 | * - When order is larger or equal to CONFIG_PPM_PAGE_ORDER, the PPM (Physical Pages |
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| 46 | * Manager) allocates 2**(order - PPM_PAGE_ORDER) contiguous small physical pages. |
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| 47 | * This allocator implements the buddy algorithm. |
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| 48 | * - When order is smaller than CONFIG_PPM_PAGE_ORDER, the KCM (Kernel Cache Manager) |
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| 49 | * allocates an aligned block of 2**order bytes from specialised KCM[ORDER] caches |
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| 50 | * (one KCM cache per block size). |
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| 51 | ************************************************************************************* |
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| 52 | * @ cxy : [in] target cluster identifier for a remote access). |
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| 53 | * @ order : [in] ln( block size in bytes). |
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| 54 | * @ flags : [in] allocation flags defined above. |
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| 55 | * @ return local pointer on allocated buffer if success / return NULL if no memory. |
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| 56 | ************************************************************************************/ |
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| 57 | void * kmem_alloc( uint32_t order, |
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| 58 | uint32_t flags ); |
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| 59 | |
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| 60 | void * kmem_remote_alloc( cxy_t cxy, |
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| 61 | uint32_t order, |
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| 62 | uint32_t flags ); |
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| 63 | |
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| 64 | /************************************************************************************* |
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| 65 | * These two functions release a previously allocated physical memory block, |
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| 66 | * as specified by the <cxy>, <order> and <ptr> arguments. |
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| 67 | * - When order is larger or equal to CONFIG_PPM_PAGE_ORDER, the PPM (Physical Pages |
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| 68 | * Manager) releases 2**(order - PPM_PAGE_ORDER) contiguous small physical pages. |
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| 69 | * This allocator implements the buddy algorithm. |
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| 70 | * - When order is smaller than CONFIG_PPM_PAGE_ORDER, the KCM (Kernel Cache Manager) |
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| 71 | * release release the block of 2**order bytes to the specialised KCM[order] cache. |
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| 72 | ************************************************************************************* |
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| 73 | * @ cxy : [in] target cluster identifier for a remote access. |
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| 74 | * @ ptr : [in] local pointer to released block. |
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| 75 | * @ order : [in] ln( block size in bytes ). |
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| 76 | ************************************************************************************/ |
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| 77 | void kmem_free( void * ptr, |
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| 78 | uint32_t order ); |
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| 79 | |
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| 80 | void kmem_remote_free( cxy_t cxy, |
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| 81 | void * ptr, |
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| 82 | uint32_t order ); |
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| 83 | |
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| 84 | |
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| 85 | #endif /* _KMEM_H_ */ |
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