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/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 */ 79