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2f06623c62
From now on, ppcmemory delegates physical address translation to MPC106 on PowerMac Beige G3.
156 lines
4.2 KiB
C++
156 lines
4.2 KiB
C++
//DingusPPC - Prototype 5bf2
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//Written by divingkatae
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//(c)2018-20 (theweirdo)
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//Please ask for permission
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//if you want to distribute this.
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//(divingkatae#1017 on Discord)
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/** MPC106 (Grackle) emulation
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Author: Max Poliakovski
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*/
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#include <iostream>
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#include <cstring>
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#include <cinttypes>
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#include "memctrlbase.h"
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#include "mmiodevice.h"
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#include "../viacuda.h"
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#include "mpc106.h"
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#include "../ppcemumain.h"
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#include "../ppcmemory.h"
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MPC106::MPC106() : MemCtrlBase("Grackle")
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{
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/* add memory mapped I/O region for MPC106 registers */
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add_mmio_region(0xFEC00000, 0x300000, this);
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}
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MPC106::~MPC106()
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{
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}
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uint32_t MPC106::read(uint32_t offset, int size)
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{
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if (offset >= 0x200000) {
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if (this->config_addr & 0x80) // process only if bit E (enable) is set
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return pci_read(size);
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}
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/* FIXME: reading from CONFIG_ADDR is ignored for now */
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return 0;
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}
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void MPC106::write(uint32_t offset, uint32_t value, int size)
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{
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if (offset < 0x200000) {
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this->config_addr = value;
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} else {
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if (this->config_addr & 0x80) // process only if bit E (enable) is set
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return pci_write(value, size);
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}
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}
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uint32_t MPC106::pci_read(uint32_t size)
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{
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int bus_num, dev_num, fun_num, reg_num;
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bus_num = (this->config_addr >> 8) & 0xFF;
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if (bus_num) {
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std::cout << this->name << " err: read attempt from non-local PCI bus, "
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<< "config_addr = " << std::hex << this->config_addr << std::endl;
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return 0;
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}
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dev_num = (this->config_addr >> 19) & 0x1F;
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fun_num = (this->config_addr >> 16) & 0x07;
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reg_num = (this->config_addr >> 24) & 0xFC;
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if (dev_num == 0 && fun_num == 0) { // dev_num 0 is assigned to myself
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return myself_read(reg_num, size);
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} else {
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std::cout << this->name << " err: reading from device " << dev_num
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<< " not supported yet" << std::endl;
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return 0;
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}
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return 0;
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}
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void MPC106::pci_write(uint32_t value, uint32_t size)
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{
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int bus_num, dev_num, fun_num, reg_num;
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bus_num = (this->config_addr >> 8) & 0xFF;
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if (bus_num) {
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std::cout << this->name << " err: write attempt to non-local PCI bus, "
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<< "config_addr = " << std::hex << this->config_addr << std::endl;
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return;
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}
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dev_num = (this->config_addr >> 19) & 0x1F;
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fun_num = (this->config_addr >> 16) & 0x07;
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reg_num = (this->config_addr >> 24) & 0xFC;
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if (dev_num == 0 && fun_num == 0) { // dev_num 0 is assigned to myself
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myself_write(reg_num, value, size);
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} else {
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std::cout << this->name << " err: writing to device " << dev_num
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<< " not supported yet" << std::endl;
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}
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}
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uint32_t MPC106::myself_read(int reg_num, uint32_t size)
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{
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#ifdef MPC106_DEBUG
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printf("read from Grackle register %08X\n", reg_num);
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#endif
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switch(size) {
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case 1:
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return this->my_pci_cfg_hdr[reg_num];
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break;
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case 2:
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return READ_WORD_BE(&this->my_pci_cfg_hdr[reg_num]);
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break;
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case 4:
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return READ_DWORD_BE(&this->my_pci_cfg_hdr[reg_num]);
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break;
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default:
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std::cout << "MPC106 read error: invalid size parameter " << size
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<< std::endl;
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}
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return 0;
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}
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void MPC106::myself_write(int reg_num, uint32_t value, uint32_t size)
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{
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#ifdef MPC106_DEBUG
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printf("write %08X to Grackle register %08X\n", value, reg_num);
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#endif
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// FIXME: implement write-protection for read-only registers
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switch(size) {
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case 1:
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this->my_pci_cfg_hdr[reg_num] = value & 0xFF;
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break;
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case 2:
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this->my_pci_cfg_hdr[reg_num] = (value >> 8) & 0xFF;
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this->my_pci_cfg_hdr[reg_num+1] = value & 0xFF;
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break;
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case 4:
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this->my_pci_cfg_hdr[reg_num] = (value >> 24) & 0xFF;
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this->my_pci_cfg_hdr[reg_num+1] = (value >> 16) & 0xFF;
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this->my_pci_cfg_hdr[reg_num+2] = (value >> 8) & 0xFF;
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this->my_pci_cfg_hdr[reg_num+3] = value & 0xFF;
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break;
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default:
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std::cout << "MPC106 read error: invalid size parameter " << size
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<< std::endl;
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}
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}
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