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dingusppc/devices/common/pci/pcidevice.cpp

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/*
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/>.
*/
#include <devices/common/pci/pcidevice.h>
#include <devices/common/viacuda.h>
#include <endianswap.h>
#include <loguru.hpp>
#include <memaccess.h>
#include <cinttypes>
#include <fstream>
#include <string>
PCIDevice::PCIDevice(std::string name)
{
this->pci_name = name;
this->pci_rd_stat = [this]() { return this->status; };
this->pci_rd_cmd = [this]() { return this->command; };
this->pci_rd_bist = []() { return 0; };
this->pci_rd_lat_timer = [this]() { return this->lat_timer; };
this->pci_rd_cache_lnsz = [this]() { return this->cache_ln_sz; };
this->pci_wr_stat = [](uint16_t val) {};
this->pci_wr_cmd = [this](uint16_t cmd) { this->command = cmd; };
this->pci_wr_bist = [](uint8_t val) {};
this->pci_wr_lat_timer = [this](uint8_t val) { this->lat_timer = val; };
this->pci_wr_cache_lnsz = [this](uint8_t val) { this->cache_ln_sz = val; };
this->pci_notify_bar_change = [](int bar_num) {};
};
uint32_t PCIDevice::pci_cfg_read(uint32_t reg_offs, uint32_t size)
{
uint32_t result;
switch (reg_offs) {
case PCI_CFG_DEV_ID:
result = (this->device_id << 16) | (this->vendor_id);
break;
case PCI_CFG_STAT_CMD:
result = (this->pci_rd_stat() << 16) | (this->pci_rd_cmd());
break;
case PCI_CFG_CLASS_REV:
result = this->class_rev;
break;
case PCI_CFG_DWORD_3:
result = (pci_rd_bist() << 24) | (this->hdr_type << 16) |
(pci_rd_lat_timer() << 8) | pci_rd_cache_lnsz();
break;
case PCI_CFG_BAR0:
case PCI_CFG_BAR1:
case PCI_CFG_BAR2:
case PCI_CFG_BAR3:
case PCI_CFG_BAR4:
case PCI_CFG_BAR5:
result = this->bars[(reg_offs - 0x10) >> 2];
break;
case PCI_CFG_SUBSYS_ID:
result = (this->subsys_id << 16) | (this->subsys_vndr);
break;
case PCI_CFG_ROM_BAR:
result = this->exp_rom_bar;
break;
case PCI_CFG_DWORD_15:
result = (max_lat << 24) | (min_gnt << 16) | (irq_pin << 8) | irq_line;
break;
case PCI_CFG_CAP_PTR:
result = cap_ptr;
break;
default:
LOG_F(
WARNING, "%s: attempt to read from reserved/unimplemented register @%02x.%c",
this->pci_name.c_str(), reg_offs,
size == 4 ? 'l' : size == 2 ? 'w' : size == 1 ? 'b' : '0' + size
);
return 0;
}
if (size == 4) {
return BYTESWAP_32(result);
} else {
return read_mem_rev(((uint8_t *)&result) + (reg_offs & 3), size);
}
}
void PCIDevice::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
{
uint32_t data;
if (size == 4) {
data = BYTESWAP_32(value);
} else {
// get current register content as DWORD and update it partially
data = BYTESWAP_32(this->pci_cfg_read(reg_offs, 4));
write_mem_rev(((uint8_t *)&data) + (reg_offs & 3), value, size);
}
switch (reg_offs) {
case PCI_CFG_STAT_CMD:
this->pci_wr_stat(data >> 16);
this->pci_wr_cmd(data & 0xFFFFU);
break;
case PCI_CFG_DWORD_3:
this->pci_wr_bist(data >> 24);
this->pci_wr_lat_timer((data >> 8) & 0xFF);
this->pci_wr_cache_lnsz(data & 0xFF);
break;
case PCI_CFG_BAR0:
case PCI_CFG_BAR1:
case PCI_CFG_BAR2:
case PCI_CFG_BAR3:
case PCI_CFG_BAR4:
case PCI_CFG_BAR5:
if (data == 0xFFFFFFFFUL) {
this->do_bar_sizing((reg_offs - 0x10) >> 2);
} else {
this->set_bar_value((reg_offs - 0x10) >> 2, data);
}
break;
case PCI_CFG_ROM_BAR:
if ((data & this->exp_bar_cfg) == this->exp_bar_cfg) {
this->exp_rom_bar = (data & (this->exp_bar_cfg | 1));
} else {
this->exp_rom_bar = (data & (this->exp_bar_cfg | 1));
if (this->exp_rom_bar & 1) {
this->map_exp_rom_mem();
} else {
LOG_F(WARNING, "%s: unmapping of expansion ROM not implemented yet",
this->pci_name.c_str());
}
}
break;
case PCI_CFG_DWORD_15:
this->irq_line = data >> 24;
break;
default:
LOG_F(
WARNING, "%s: attempt to write to reserved/unimplemented register @%02x.%c = %0*x",
this->pci_name.c_str(), reg_offs,
size == 4 ? 'l' : size == 2 ? 'w' : size == 1 ? 'b' : '0' + size,
size * 2, BYTESWAP_SIZED(value, size)
);
}
}
int PCIDevice::attach_exp_rom_image(const std::string img_path)
{
std::ifstream img_file;
int result = 0;
this->exp_bar_cfg = 0; // tell the world we got no ROM for now
try {
img_file.open(img_path, std::ios::in | std::ios::binary);
if (img_file.fail()) {
throw std::runtime_error("could not open specified ROM dump image");
}
// validate image file
uint8_t buf[4] = { 0 };
img_file.seekg(0, std::ios::beg);
img_file.read((char *)buf, sizeof(buf));
if (buf[0] != 0x55 || buf[1] != 0xAA) {
throw std::runtime_error("invalid expansion ROM signature");
}
// determine image size
img_file.seekg(0, std::ios::end);
uint32_t exp_rom_image_size = img_file.tellg();
// verify PCI struct offset
uint16_t pci_struct_offset = 0;
img_file.seekg(0x18, std::ios::beg);
img_file.read((char *)&pci_struct_offset, sizeof(pci_struct_offset));
if (pci_struct_offset > exp_rom_image_size) {
throw std::runtime_error("invalid PCI structure offset");
}
// verify PCI struct signature
img_file.seekg(pci_struct_offset, std::ios::beg);
img_file.read((char *)buf, sizeof(buf));
if (buf[0] != 'P' || buf[1] != 'C' || buf[2] != 'I' || buf[3] != 'R') {
throw std::runtime_error("unexpected PCI struct signature");
}
// find minimum rom size for the rom file (power of 2 >= 0x800)
for (this->exp_rom_size = 1 << 11; this->exp_rom_size < exp_rom_image_size; this->exp_rom_size <<= 1) {}
// ROM image ok - go ahead and load it
this->exp_rom_data = std::unique_ptr<uint8_t[]> (new uint8_t[this->exp_rom_size]);
img_file.seekg(0, std::ios::beg);
img_file.read((char *)this->exp_rom_data.get(), exp_rom_image_size);
memset(&this->exp_rom_data[exp_rom_image_size], 0xff, this->exp_rom_size - exp_rom_image_size);
if (exp_rom_image_size == this->exp_rom_size) {
LOG_F(INFO, "%s: loaded expansion rom (%d bytes).",
this->pci_name.c_str(), this->exp_rom_size);
}
else {
LOG_F(WARNING, "%s: loaded expansion rom (%d bytes adjusted to %d bytes).",
this->pci_name.c_str(), exp_rom_image_size, this->exp_rom_size);
}
this->exp_bar_cfg = ~(this->exp_rom_size - 1);
}
catch (const std::exception& exc) {
LOG_F(ERROR, "PCIDevice: %s", exc.what());
result = -1;
}
img_file.close();
return result;
}
void PCIDevice::do_bar_sizing(int bar_num)
{
this->bars[bar_num] = this->bars_cfg[bar_num];
}
void PCIDevice::set_bar_value(int bar_num, uint32_t value)
{
uint32_t bar_cfg = this->bars_cfg[bar_num];
if (bar_cfg & 1) {
this->bars[bar_num] = (value & 0xFFFFFFFCUL) | 1;
} else {
if (bar_cfg & 6) {
ABORT_F("Invalid or unsupported PCI space type: %d", (bar_cfg >> 1) & 3);
}
this->bars[bar_num] = (value & 0xFFFFFFF0UL) | (bar_cfg & 0xF);
}
this->pci_notify_bar_change(bar_num);
}
void PCIDevice::map_exp_rom_mem()
{
uint32_t rom_addr, rom_size;
rom_addr = this->exp_rom_bar & this->exp_bar_cfg;
rom_size = ~this->exp_bar_cfg + 1;
if (!this->exp_rom_addr || this->exp_rom_addr != rom_addr) {
this->host_instance->pci_register_mmio_region(rom_addr, rom_size, this);
this->exp_rom_addr = rom_addr;
}
}
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