| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | /* generate a virtual address for a given size */ |
| 37 | |
| 38 | #ifndef MICSCIF_VA_GEN_H |
| 39 | #define MICSCIF_VA_GEN_H |
| 40 | |
| 41 | #include "micscif_va_node.h" |
| 42 | |
| 43 | /* |
| 44 | * To avoid collisions with user applications trying to use |
| 45 | * MAP_FIXED with scif_register(), the following window address space |
| 46 | * allocation scheme is used. |
| 47 | * |
| 48 | * 1) (0) - (2 ^ 62 - 1)) |
| 49 | * Window Address Space that can be claimed using MAP_FIXED. |
| 50 | * 2) (2 ^ 62) - (2 ^ 63) - 1) |
| 51 | * Window address space used for allocations by the SCIF driver |
| 52 | * when MAP_FIXED is not passed. |
| 53 | */ |
| 54 | #define VA_GEN_MIN 0x4000000000000000 |
| 55 | #define VA_GEN_RANGE 0x3f00000000000000 |
| 56 | |
| 57 | #define INVALID_VA_GEN_ADDRESS 0xff00000000000000 |
| 58 | #define INVALID_VA_PAGE_INDEX 0xff00000000000 |
| 59 | |
| 60 | struct va_gen_addr { |
| 61 | struct va_node_allocator allocator; |
| 62 | uint32_t hole_list; |
| 63 | uint32_t claims_list; |
| 64 | uint64_t base; |
| 65 | }; |
| 66 | |
| 67 | /* |
| 68 | * return a base for the range |
| 69 | * caller trusted to keep track of both base and range |
| 70 | */ |
| 71 | uint64_t va_gen_alloc(struct va_gen_addr *addr, |
| 72 | uint64_t num_bytes, uint32_t align_bytes); |
| 73 | |
| 74 | /* Claim ownership of memory region. Fails if already occupied */ |
| 75 | uint64_t va_gen_claim(struct va_gen_addr *addr, |
| 76 | uint64_t address, uint64_t num_bytes); |
| 77 | |
| 78 | /* release ownership of a base/range */ |
| 79 | void va_gen_free(struct va_gen_addr *addr, |
| 80 | uint64_t address, uint64_t num_bytes); |
| 81 | |
| 82 | int va_gen_init(struct va_gen_addr *addr, uint64_t base, uint64_t range); |
| 83 | |
| 84 | void va_gen_destroy(struct va_gen_addr *addr); |
| 85 | |
| 86 | #endif |