113 lines
3.5 KiB
C++
113 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/memctrl/psx.h>
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#include <devices/common/pci/pcihost.h>
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#include <devices/ioctrl/macio.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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// 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, 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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{"gfxmem_size",
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new IntProperty( 1, vector<uint32_t>({1, 2, 4}))},
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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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