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