73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** Highspeed Memory Controller emulation.
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Author: Max Poliakovski
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*/
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#include <devices/deviceregistry.h>
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#include <devices/common/hwcomponent.h>
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#include <devices/memctrl/hmc.h>
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HMC::HMC() : MemCtrlBase()
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{
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this->name = "Highspeed Memory Controller";
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supports_types(HWCompType::MEM_CTRL | HWCompType::MMIO_DEV);
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/* add memory mapped I/O region for the HMC control register */
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add_mmio_region(0x50F40000, 0x10000, this);
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this->ctrl_reg = 0ULL;
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this->bit_pos = 0;
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}
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uint32_t HMC::read(uint32_t rgn_start, uint32_t offset, int size)
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{
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if (!offset)
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return !!(this->ctrl_reg & (1ULL << this->bit_pos++));
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else
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return 0; /* FIXME: what should be returned for invalid offsets? */
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}
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void HMC::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
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{
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uint64_t bit;
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switch(offset) {
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case 0:
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bit = 1ULL << this->bit_pos++;
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this->ctrl_reg = (value & 1) ? this->ctrl_reg | bit :
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this->ctrl_reg & ~bit;
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break;
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case 8: /* writing to HMCBase + 8 resets internal bit position */
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this->bit_pos = 0;
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break;
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}
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}
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static const DeviceDescription Hmc_Descriptor = {
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HMC::create, {}, {}
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};
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REGISTER_DEVICE(HMC, Hmc_Descriptor);
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