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https://github.com/dingusdev/dingusppc.git
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The first option is a flag that enables MPC601 (POWER) instructions for CPUs that are not MPC601. This can be useful for the following reasons: 1) To produce results similar to classic Mac OS which emulates MPC601 instructions on CPUs that don't implement MPC601 instructions. This option is used to compare the risu traces produced in Mac OS 9 on a G3 or G4 with DPPC. 2) May increase performance in apps that use POWER instructions on emulated machines with CPUs that are not MPC601. It is not known if any such apps exist but there could be since Apple included MPC601 emulation in classic Mac OS.
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 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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/** Constructs a Gazelle style machine. This family includes
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Power Macintosh 5500, 6500 and Twentieth Anniversary Mac.
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*/
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#include <cpu/ppc/ppcemu.h>
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#include <devices/common/hwcomponent.h>
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#include <devices/memctrl/psx.h>
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#include <devices/common/pci/pcidevice.h>
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#include <devices/common/pci/pcihost.h>
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#include <machines/machinebase.h>
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#include <machines/machinefactory.h>
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#include <machines/machineproperties.h>
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#include <memctrl/memctrlbase.h>
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#include <loguru.hpp>
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// TODO: move it to /cpu/ppc
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int get_cpu_pll_value(const uint64_t cpu_freq_hz) {
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switch (cpu_freq_hz / 1000000) {
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case 225:
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return 7; // 4.5:1 ratio
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case 250:
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return 11; // 5:1 ratio
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case 275:
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return 9; // 5.5:1 ratio
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default:
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ABORT_F("Unsupported CPU frequency %llu Hz", cpu_freq_hz);
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}
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}
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int initialize_gazelle(std::string& id)
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{
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LOG_F(INFO, "Building machine Gazelle...");
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PCIHost *pci_host = dynamic_cast<PCIHost*>(gMachineObj->get_comp_by_name("PsxPci1"));
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// register O'Hare I/O controller with the main PCI bus
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pci_host->pci_register_device(
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DEV_FUN(0x10,0), dynamic_cast<PCIDevice*>(gMachineObj->get_comp_by_name("OHare")));
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PsxCtrl* psx_obj = dynamic_cast<PsxCtrl*>(gMachineObj->get_comp_by_name("Psx"));
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// allocate ROM region
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if (!psx_obj->add_rom_region(0xFFC00000, 0x400000)) {
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LOG_F(ERROR, "Could not allocate ROM region!");
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return -1;
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}
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// plug 32MB RAM DIMM into slot #0
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psx_obj->insert_ram_dimm(0, DRAM_CAP_32MB);
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// allocate and map physical RAM
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psx_obj->map_phys_ram();
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// configure CPU clocks
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uint64_t bus_freq = 50000000ULL;
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uint64_t timebase_freq = bus_freq / 4;
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// init virtual CPU and request MPC603ev
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ppc_cpu_init(psx_obj, PPC_VER::MPC603EV, false, timebase_freq);
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// CPU frequency is hardcoded to 225 MHz for now
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ppc_state.spr[SPR::HID1] = get_cpu_pll_value(225000000) << 28;
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return 0;
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}
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static const PropMap pm6500_settings = {
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{"rambank1_size",
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new IntProperty(16, vector<uint32_t>({4, 8, 16, 32, 64, 128}))},
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{"rambank2_size",
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new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
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{"rambank3_size",
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new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
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{"rambank4_size",
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new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
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{"emmo",
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new BinProperty(0)},
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};
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static vector<string> pm6500_devices = {
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"Psx", "PsxPci1", "OHare"
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};
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static const MachineDescription pm6500_descriptor = {
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.name = "pm6500",
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.description = "Power Macintosh 6500",
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.devices = pm6500_devices,
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.settings = pm6500_settings,
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.init_func = &initialize_gazelle
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};
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REGISTER_MACHINE(pm6500, pm6500_descriptor);
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