dingusppc/machines/machinegazelle.cpp

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2022-12-23 16:12:09 +00:00
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Constructs a Gazelle style machine. This family includes
Power Macintosh 5500, 6500 and Twentieth Anniversary Mac.
*/
#include <cpu/ppc/ppcemu.h>
#include <devices/memctrl/psx.h>
#include <devices/common/pci/pcihost.h>
#include <devices/ioctrl/macio.h>
#include <machines/machinebase.h>
#include <machines/machinefactory.h>
#include <machines/machineproperties.h>
// TODO: move it to /cpu/ppc
int get_cpu_pll_value(const uint64_t cpu_freq_hz) {
switch (cpu_freq_hz / 1000000) {
case 225:
return 7; // 4.5:1 ratio
case 250:
return 11; // 5:1 ratio
case 275:
return 9; // 5.5:1 ratio
default:
ABORT_F("Unsupported CPU frequency %llu Hz", cpu_freq_hz);
}
}
int initialize_gazelle(std::string& id)
{
LOG_F(INFO, "Building machine Gazelle...");
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PCIHost *pci_host = dynamic_cast<PCIHost*>(gMachineObj->get_comp_by_name("PsxPci1"));
// register O'Hare I/O controller with the main PCI bus
pci_host->pci_register_device(
32, dynamic_cast<PCIDevice*>(gMachineObj->get_comp_by_name("OHare")));
PsxCtrl* psx_obj = dynamic_cast<PsxCtrl*>(gMachineObj->get_comp_by_name("Psx"));
// allocate ROM region
if (!psx_obj->add_rom_region(0xFFC00000, 0x400000)) {
LOG_F(ERROR, "Could not allocate ROM region!");
return -1;
}
// plug 32MB RAM DIMM into slot #0
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psx_obj->insert_ram_dimm(0, DRAM_CAP_32MB);
// allocate and map physical RAM
psx_obj->map_phys_ram();
// configure CPU clocks
uint64_t bus_freq = 50000000ULL;
uint64_t timebase_freq = bus_freq / 4;
// init virtual CPU and request MPC603ev
ppc_cpu_init(psx_obj, PPC_VER::MPC603EV, timebase_freq);
// CPU frequency is hardcoded to 225 MHz for now
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ppc_state.spr[SPR::HID1] = get_cpu_pll_value(225000000) << 28;
return 0;
}
static const PropMap pm6500_settings = {
{"rambank1_size",
new IntProperty(16, vector<uint32_t>({4, 8, 16, 32, 64, 128}))},
{"rambank2_size",
new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
{"rambank3_size",
new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
{"rambank4_size",
new IntProperty( 0, vector<uint32_t>({0, 4, 8, 16, 32, 64, 128}))},
{"gfxmem_size",
new IntProperty( 1, vector<uint32_t>({1, 2, 4}))},
{"emmo",
new BinProperty(0)},
};
static vector<string> pm6500_devices = {
"Psx", "PsxPci1", "OHare"
};
static const MachineDescription pm6500_descriptor = {
.name = "pm6500",
.description = "Power Macintosh 6500",
.devices = pm6500_devices,
.settings = pm6500_settings,
.init_func = &initialize_gazelle
};
REGISTER_MACHINE(pm6500, pm6500_descriptor);