Macintosh-Tools
/
dingusppc
mirror of https://github.com/dingusdev/dingusppc.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Basic PSX memory controller emulation.

This commit is contained in:
Maxim Poliakovski 2022-12-21 21:58:00 +01:00
parent 648dfcd47b
commit a1d9fcfa9d
2 changed files with 216 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

128
devices/memctrl/psx.cpp Normal file
View File

@ -0,0 +1,128 @@
/*
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/>.
*/
/** PSX Memory Controller emulation. */
#include <devices/deviceregistry.h>
#include <devices/memctrl/psx.h>
#include <loguru.hpp>
#include <cinttypes>
#include <string>
PsxCtrl::PsxCtrl(int bridge_num, std::string name)
{
supports_types(HWCompType::MEM_CTRL | HWCompType::MMIO_DEV);
// add MMIO region for the PSX control registers
add_mmio_region(0xF8000000, 0x70, this);
this->sys_id = 0x30040000; // TODO: use correct value here!
this->chip_rev = 0; // old PSX, what's about PSX+?
this->sys_config = PSX_BUS_SPEED_50;
}
uint32_t PsxCtrl::read(uint32_t rgn_start, uint32_t offset, int size)
{
switch (offset >> 3) {
case PsxReg::Sys_Id:
return this->sys_id;
case PsxReg::Revision:
return this->chip_rev;
case PsxReg::Sys_Config:
return this->sys_config;
default:
LOG_F(WARNING, "PSX: read from unsupported control register at 0x%X", offset);
return 0;
}
}
void PsxCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
{
switch (offset >> 3) {
case PsxReg::Sys_Config:
this->sys_config = value;
break;
case PsxReg::ROM_Config:
this->rom_cfg = value;
break;
case PsxReg::DRAM_Config:
this->dram_cfg = value;
break;
case PsxReg::DRAM_Refresh:
this->dram_refresh = value;
break;
case PsxReg::Flash_Config:
this->flash_cfg = value;
break;
case PsxReg::Page1_Mapping:
case PsxReg::Page2_Mapping:
case PsxReg::Page3_Mapping:
case PsxReg::Page4_Mapping:
case PsxReg::Page5_Mapping:
this->pages_cfg[(offset >> 3) - PsxReg::Page1_Mapping] = value;
break;
default:
LOG_F(WARNING, "PSX: write to unsupported/read-only control register at 0x%X", offset);
};
}
void PsxCtrl::insert_ram_dimm(int slot_num, uint32_t capacity)
{
if (slot_num < 0 || slot_num >= 5) {
ABORT_F("PSX: invalid DIMM slot %d", slot_num);
}
switch (capacity) {
case DRAM_CAP_2MB:
case DRAM_CAP_4MB:
case DRAM_CAP_8MB:
case DRAM_CAP_16MB:
case DRAM_CAP_32MB:
this->bank_sizes[slot_num] = capacity;
break;
default:
ABORT_F("PSX: unsupported DRAM capacity %d", capacity);
}
}
void PsxCtrl::map_phys_ram()
{
uint32_t total_ram = 0;
for (int i = 0; i < 5; i++) {
total_ram += this->bank_sizes[i];
}
if (total_ram > DRAM_CAP_32MB) {
ABORT_F("PSX: RAM bigger than 32MB not supported yet");
}
if (!add_ram_region(0x00000000, total_ram)) {
ABORT_F("PSX: could not allocate RAM storage");
}
}
static const DeviceDescription Psx_Descriptor = {
PsxCtrl::create, {}, {}
};
REGISTER_DEVICE(Psx, Psx_Descriptor);

88
devices/memctrl/psx.h Normal file
View File

@ -0,0 +1,88 @@
/*
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/>.
*/
/** PSX Memory Controller definitions. */
#ifndef PSX_MEMCTRL_H
#define PSX_MEMCTRL_H
#include <devices/common/mmiodevice.h>
#include <devices/memctrl/memctrlbase.h>
#include <cinttypes>
#include <memory>
#include <string>
namespace PsxReg {
enum {
Sys_Id = 0,
Revision = 1,
Sys_Config = 2,
ROM_Config = 3,
DRAM_Config = 4,
DRAM_Refresh = 5,
Flash_Config = 6,
Page1_Mapping = 8,
Page2_Mapping = 9,
Page3_Mapping = 10,
Page4_Mapping = 11,
Page5_Mapping = 12,
Bus_Timeout = 13
};
}; // namespace PsxReg
/** Bus (aka CPU) speed constants. */
enum {
PSX_BUS_SPEED_38 = 0, // bus frequency 38 MHz
PSX_BUS_SPEED_33 = 1, // bus frequency 33 MHz
PSX_BUS_SPEED_40 = 2, // bus frequency 40 MHz
PSX_BUS_SPEED_50 = 3, // bus frequency 50 MHz
};
class PsxCtrl : public MemCtrlBase, public MMIODevice {
public:
PsxCtrl(int bridge_num, std::string name);
~PsxCtrl() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<PsxCtrl>(new PsxCtrl(1, "PSX-PCI1"));
};
// MMIODevice methods
uint32_t read(uint32_t rgn_start, uint32_t offset, int size);
void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size);
void insert_ram_dimm(int slot_num, uint32_t capacity);
void map_phys_ram();
private:
uint32_t sys_id;
uint32_t chip_rev;
uint32_t sys_config;
uint32_t rom_cfg;
uint32_t dram_cfg;
uint32_t dram_refresh;
uint32_t flash_cfg;
uint32_t pages_cfg[5];
uint32_t bank_sizes[5] = {};
};
#endif // PSX_MEMCTRL_H