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 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/sysbus.h" 24 #include "qom/object.h" 25 26 #define TYPE_MIPS_ITU "mips-itu" 27 typedef struct MIPSITUState MIPSITUState; 28 DECLARE_INSTANCE_CHECKER(MIPSITUState, MIPS_ITU, 29 TYPE_MIPS_ITU) 30 31 #define ITC_CELL_DEPTH_SHIFT 2 32 #define ITC_CELL_DEPTH (1u << ITC_CELL_DEPTH_SHIFT) 33 34 typedef struct ITCStorageCell { 35 struct { 36 uint8_t FIFODepth; /* Log2 of the cell depth */ 37 uint8_t FIFOPtr; /* Number of elements in a FIFO cell */ 38 uint8_t FIFO; /* 1 - FIFO cell, 0 - Semaphore cell */ 39 uint8_t T; /* Trap Bit */ 40 uint8_t F; /* Full Bit */ 41 uint8_t E; /* Empty Bit */ 42 } tag; 43 44 /* Index of the oldest element in the queue */ 45 uint8_t fifo_out; 46 47 /* Circular buffer for FIFO. Semaphore cells use index 0 only */ 48 uint64_t data[ITC_CELL_DEPTH]; 49 50 /* Bitmap tracking blocked threads on the cell. 51 TODO: support >64 threads ? */ 52 uint64_t blocked_threads; 53 } ITCStorageCell; 54 55 #define ITC_ADDRESSMAP_NUM 2 56 57 struct MIPSITUState { 58 /*< private >*/ 59 SysBusDevice parent_obj; 60 /*< public >*/ 61 62 int32_t num_fifo; 63 int32_t num_semaphores; 64 65 /* ITC Storage */ 66 ITCStorageCell *cell; 67 MemoryRegion storage_io; 68 69 /* ITC Configuration Tags */ 70 uint64_t ITCAddressMap[ITC_ADDRESSMAP_NUM]; 71 MemoryRegion tag_io; 72 73 /* ITU Control Register */ 74 uint64_t icr0; 75 76 /* SAAR */ 77 bool saar_present; 78 void *saar; 79 80 }; 81 82 /* Get ITC Configuration Tag memory region. */ 83 MemoryRegion *mips_itu_get_tag_region(MIPSITUState *itu); 84 85 #endif /* MIPS_ITU_H */ 86