| 1 | /* |
| 2 | * Inter-Thread Communication Unit emulation. |
| 3 | * |
| 4 | * Copyright (c) 2016 Imagination Technologies |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #ifndef MIPS_ITU_H |
| 21 | #define MIPS_ITU_H |
| 22 | |
| 23 | #include "hw/core/sysbus.h" |
| 24 | #include "qom/object.h" |
| 25 | |
| 26 | #define TYPE_MIPS_ITU "mips-itu" |
| 27 | OBJECT_DECLARE_SIMPLE_TYPE(MIPSITUState, MIPS_ITU) |
| 28 | |
| 29 | #define ITC_CELL_DEPTH_SHIFT 2 |
| 30 | #define ITC_CELL_DEPTH (1u << ITC_CELL_DEPTH_SHIFT) |
| 31 | |
| 32 | typedef struct ITCStorageCell { |
| 33 | struct { |
| 34 | uint8_t FIFODepth; /* Log2 of the cell depth */ |
| 35 | uint8_t FIFOPtr; /* Number of elements in a FIFO cell */ |
| 36 | uint8_t FIFO; /* 1 - FIFO cell, 0 - Semaphore cell */ |
| 37 | uint8_t T; /* Trap Bit */ |
| 38 | uint8_t F; /* Full Bit */ |
| 39 | uint8_t E; /* Empty Bit */ |
| 40 | } tag; |
| 41 | |
| 42 | /* Index of the oldest element in the queue */ |
| 43 | uint8_t fifo_out; |
| 44 | |
| 45 | /* Circular buffer for FIFO. Semaphore cells use index 0 only */ |
| 46 | uint64_t data[ITC_CELL_DEPTH]; |
| 47 | |
| 48 | /* Bitmap tracking blocked threads on the cell. |
| 49 | TODO: support >64 threads ? */ |
| 50 | uint64_t blocked_threads; |
| 51 | } ITCStorageCell; |
| 52 | |
| 53 | #define ITC_ADDRESSMAP_NUM 2 |
| 54 | |
| 55 | struct MIPSITUState { |
| 56 | /*< private >*/ |
| 57 | SysBusDevice parent_obj; |
| 58 | /*< public >*/ |
| 59 | |
| 60 | uint32_t num_fifo; |
| 61 | uint32_t num_semaphores; |
| 62 | |
| 63 | /* ITC Storage */ |
| 64 | ITCStorageCell *cell; |
| 65 | MemoryRegion storage_io; |
| 66 | |
| 67 | /* ITC Configuration Tags */ |
| 68 | uint64_t ITCAddressMap[ITC_ADDRESSMAP_NUM]; |
| 69 | MemoryRegion tag_io; |
| 70 | |
| 71 | /* ITU Control Register */ |
| 72 | uint64_t icr0; |
| 73 | }; |
| 74 | |
| 75 | /* Get ITC Configuration Tag memory region. */ |
| 76 | MemoryRegion *mips_itu_get_tag_region(MIPSITUState *itu); |
| 77 | |
| 78 | #endif /* MIPS_ITU_H */ |