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