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