include/hw/misc/mips_itu.h

   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 */