qemu

FORK: QEMU emulator
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mips_itu.h (2289B)

      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     int32_t num_fifo;
     61     int32_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     /* SAAR */
     75     bool saar_present;
     76     void *saar;
     77 
     78 };
     79 
     80 /* Get ITC Configuration Tag memory region. */
     81 MemoryRegion *mips_itu_get_tag_region(MIPSITUState *itu);
     82 
     83 #endif /* MIPS_ITU_H */