LXR qemu/include/hw/misc/mips

   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
  31typedef 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
  54typedef 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. */
  72MemoryRegion *mips_itu_get_tag_region(MIPSITUState *itu);
  73
  74#endif /* MIPS_ITU_H */
  75