mirror of
https://github.com/dingusdev/dingusppc.git
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244 lines
7.6 KiB
C++
244 lines
7.6 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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#include <devices/common/pci/pcidevice.h>
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#include <devices/common/viacuda.h>
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#include <endianswap.h>
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#include <loguru.hpp>
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#include <memaccess.h>
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#include <cinttypes>
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#include <fstream>
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#include <string>
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PCIDevice::PCIDevice(std::string name)
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{
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this->pci_name = name;
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this->pci_rd_stat = []() { return 0; };
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this->pci_rd_cmd = [this]() { return this->command; };
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this->pci_rd_bist = []() { return 0; };
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this->pci_rd_lat_timer = [this]() { return this->lat_timer; };
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this->pci_rd_cache_lnsz = [this]() { return this->cache_ln_sz; };
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this->pci_wr_stat = [](uint16_t val) {};
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this->pci_wr_cmd = [this](uint16_t cmd) { this->command = cmd; };
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this->pci_wr_bist = [](uint8_t val) {};
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this->pci_wr_lat_timer = [this](uint8_t val) { this->lat_timer = val; };
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this->pci_wr_cache_lnsz = [this](uint8_t val) { this->cache_ln_sz = val; };
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this->pci_notify_bar_change = [](int bar_num) {};
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};
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uint32_t PCIDevice::pci_cfg_read(uint32_t reg_offs, uint32_t size)
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{
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uint32_t result;
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switch (reg_offs) {
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case PCI_CFG_DEV_ID:
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result = (this->device_id << 16) | (this->vendor_id);
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break;
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case PCI_CFG_STAT_CMD:
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result = (this->pci_rd_stat() << 16) | (this->pci_rd_cmd());
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break;
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case PCI_CFG_CLASS_REV:
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result = this->class_rev;
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break;
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case PCI_CFG_DWORD_3:
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result = (pci_rd_bist() << 24) | (this->hdr_type << 16) |
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(pci_rd_lat_timer() << 8) | pci_rd_cache_lnsz();
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break;
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case PCI_CFG_BAR0:
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case PCI_CFG_BAR1:
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case PCI_CFG_BAR2:
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case PCI_CFG_BAR3:
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case PCI_CFG_BAR4:
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case PCI_CFG_BAR5:
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result = this->bars[(reg_offs - 0x10) >> 2];
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break;
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case PCI_CFG_SUBSYS_ID:
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result = (this->subsys_id << 16) | (this->subsys_vndr);
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break;
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case PCI_CFG_ROM_BAR:
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result = this->exp_rom_bar;
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break;
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case PCI_CFG_DWORD_15:
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result = (max_lat << 24) | (min_gnt << 16) | (irq_pin << 8) | irq_line;
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break;
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default:
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LOG_F(WARNING, "%s: attempt to read from reserved/unimplemented register %d",
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this->pci_name.c_str(), reg_offs);
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return 0;
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}
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if (size == 4) {
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return BYTESWAP_32(result);
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} else {
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return read_mem_rev(((uint8_t *)&result) + (reg_offs & 3), size);
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}
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}
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void PCIDevice::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
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{
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uint32_t data;
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if (size == 4) {
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data = BYTESWAP_32(value);
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} else {
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// get current register content as DWORD and update it partially
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data = BYTESWAP_32(this->pci_cfg_read(reg_offs, 4));
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write_mem_rev(((uint8_t *)&data) + (reg_offs & 3), value, size);
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}
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switch (reg_offs) {
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case PCI_CFG_STAT_CMD:
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this->pci_wr_stat(data >> 16);
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this->pci_wr_cmd(data & 0xFFFFU);
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break;
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case PCI_CFG_DWORD_3:
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this->pci_wr_bist(data >> 24);
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this->pci_wr_lat_timer((data >> 8) & 0xFF);
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this->pci_wr_cache_lnsz(data & 0xFF);
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break;
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case PCI_CFG_BAR0:
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case PCI_CFG_BAR1:
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case PCI_CFG_BAR2:
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case PCI_CFG_BAR3:
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case PCI_CFG_BAR4:
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case PCI_CFG_BAR5:
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if (data == 0xFFFFFFFFUL) {
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this->do_bar_sizing((reg_offs - 0x10) >> 2);
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} else {
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this->set_bar_value((reg_offs - 0x10) >> 2, data);
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}
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break;
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case PCI_CFG_ROM_BAR:
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if (data == 0xFFFFF800UL) {
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this->exp_rom_bar = this->exp_bar_cfg;
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} else {
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this->exp_rom_bar = (data & 0xFFFFF801UL);
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if (this->exp_rom_bar & 1) {
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this->map_exp_rom_mem(this->exp_rom_bar & 0xFFFFF800UL);
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} else {
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LOG_F(WARNING, "%s: unmapping of expansion ROM not implemented yet",
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this->pci_name.c_str());
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}
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}
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break;
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case PCI_CFG_DWORD_15:
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this->irq_line = data >> 24;
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break;
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default:
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LOG_F(WARNING, "%s: attempt to write to reserved/unimplemented register %d",
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this->pci_name.c_str(), reg_offs);
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}
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}
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int PCIDevice::attach_exp_rom_image(const std::string img_path)
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{
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std::ifstream img_file;
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int result = 0;
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this->exp_bar_cfg = 0; // tell the world we got no ROM for now
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try {
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img_file.open(img_path, std::ios::in | std::ios::binary);
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if (img_file.fail()) {
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throw std::runtime_error("could not open specified ROM dump image");
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}
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// validate image file
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uint8_t buf[4] = { 0 };
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img_file.seekg(0, std::ios::beg);
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img_file.read((char *)buf, sizeof(buf));
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if (buf[0] != 0x55 || buf[1] != 0xAA) {
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throw std::runtime_error("invalid expansion ROM signature");
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}
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// determine image size
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img_file.seekg(0, std::ios::end);
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this->exp_rom_size = img_file.tellg();
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// verify PCI struct offset
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uint32_t pci_struct_offset = 0;
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img_file.seekg(0x18, std::ios::beg);
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img_file.read((char *)&pci_struct_offset, sizeof(pci_struct_offset));
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if (pci_struct_offset > this->exp_rom_size) {
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throw std::runtime_error("invalid PCI structure offset");
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}
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// verify PCI struct signature
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img_file.seekg(pci_struct_offset, std::ios::beg);
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img_file.read((char *)buf, sizeof(buf));
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if (buf[0] != 'P' || buf[1] != 'C' || buf[2] != 'I' || buf[3] != 'R') {
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throw std::runtime_error("unexpected PCI struct signature");
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}
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// ROM image ok - go ahead and load it
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this->exp_rom_data = std::unique_ptr<uint8_t[]> (new uint8_t[this->exp_rom_size]);
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img_file.seekg(0, std::ios::beg);
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img_file.read((char *)this->exp_rom_data.get(), this->exp_rom_size);
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// align ROM image size on a 2KB boundary and initialize ROM config
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this->exp_rom_size = (this->exp_rom_size + 0x7FFU) & 0xFFFFF800UL;
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this->exp_bar_cfg = ~(this->exp_rom_size - 1);
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}
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catch (const std::exception& exc) {
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LOG_F(ERROR, "PCIDevice: %s", exc.what());
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result = -1;
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}
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img_file.close();
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return result;
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}
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void PCIDevice::do_bar_sizing(int bar_num)
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{
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this->bars[bar_num] = this->bars_cfg[bar_num];
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}
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void PCIDevice::set_bar_value(int bar_num, uint32_t value)
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{
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uint32_t bar_cfg = this->bars_cfg[bar_num];
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if (bar_cfg & 1) {
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this->bars[bar_num] = (value & 0xFFFFFFFCUL) | 1;
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} else {
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if (bar_cfg & 6) {
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ABORT_F("Invalid or unsupported PCI space type: %d", (bar_cfg >> 1) & 3);
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}
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this->bars[bar_num] = (value & 0xFFFFFFF0UL) | (bar_cfg & 0xF);
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}
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this->pci_notify_bar_change(bar_num);
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}
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void PCIDevice::map_exp_rom_mem(uint32_t rom_addr)
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{
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if (!this->exp_rom_addr || this->exp_rom_addr != rom_addr) {
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this->host_instance->pci_register_mmio_region(rom_addr, 0x10000, this);
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}
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}
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