82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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* Inter-Thread Communication Unit emulation.
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*
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* Copyright (c) 2016 Imagination Technologies
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MIPS_ITU_H
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#define MIPS_ITU_H
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#include "hw/sysbus.h"
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#define TYPE_MIPS_ITU "mips-itu"
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#define MIPS_ITU(obj) OBJECT_CHECK(MIPSITUState, (obj), TYPE_MIPS_ITU)
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#define ITC_CELL_DEPTH_SHIFT 2
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#define ITC_CELL_DEPTH (1u << ITC_CELL_DEPTH_SHIFT)
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typedef struct ITCStorageCell {
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struct {
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uint8_t FIFODepth; /* Log2 of the cell depth */
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uint8_t FIFOPtr; /* Number of elements in a FIFO cell */
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uint8_t FIFO; /* 1 - FIFO cell, 0 - Semaphore cell */
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uint8_t T; /* Trap Bit */
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uint8_t F; /* Full Bit */
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uint8_t E; /* Empty Bit */
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} tag;
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/* Index of the oldest element in the queue */
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uint8_t fifo_out;
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/* Circular buffer for FIFO. Semaphore cells use index 0 only */
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uint64_t data[ITC_CELL_DEPTH];
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/* Bitmap tracking blocked threads on the cell.
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TODO: support >64 threads ? */
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uint64_t blocked_threads;
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} ITCStorageCell;
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#define ITC_ADDRESSMAP_NUM 2
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typedef struct MIPSITUState {
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/*< private >*/
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SysBusDevice parent_obj;
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/*< public >*/
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int32_t num_fifo;
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int32_t num_semaphores;
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/* ITC Storage */
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ITCStorageCell *cell;
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MemoryRegion storage_io;
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/* ITC Configuration Tags */
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uint64_t ITCAddressMap[ITC_ADDRESSMAP_NUM];
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MemoryRegion tag_io;
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/* ITU Control Register */
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uint64_t icr0;
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/* SAAR */
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bool saar_present;
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void *saar;
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} MIPSITUState;
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/* Get ITC Configuration Tag memory region. */
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MemoryRegion *mips_itu_get_tag_region(MIPSITUState *itu);
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#endif /* MIPS_ITU_H */
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