mirror of
https://github.com/dingusdev/dingusppc.git
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312 lines
9.9 KiB
C++
312 lines
9.9 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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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/** Bandit/Chaos ARBus-to-PCI Bridge emulation. */
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#include <devices/common/pci/bandit.h>
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#include <devices/deviceregistry.h>
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#include <devices/memctrl/memctrlbase.h>
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#include <endianswap.h>
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#include <loguru.hpp>
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#include <machines/machinebase.h>
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#include <memaccess.h>
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#include <cinttypes>
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const int MultiplyDeBruijnBitPosition2[] =
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{
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0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
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31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
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};
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/** finds the position of the bit that is set */
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#define WHAT_BIT_SET(val) (MultiplyDeBruijnBitPosition2[(uint32_t)(val * 0x077CB531U) >> 27])
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BanditPciDevice::BanditPciDevice(int bridge_num, std::string name, int dev_id, int rev)
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: PCIDevice(name)
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{
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supports_types(HWCompType::PCI_DEV);
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// prepare the PCI config header
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this->vendor_id = PCI_VENDOR_APPLE;
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this->device_id = dev_id;
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this->class_rev = 0x06000000 | (rev & 0xFFU);
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this->cache_ln_sz = 8;
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this->command = 0x16;
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// make several PCI config space registers read-only
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this->pci_wr_cmd = [](uint16_t cmd) {}; // command register
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this->pci_wr_cache_lnsz = [](uint8_t val) {}; // cache line size register
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// set the bits in the fine address space field of the address mask register
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// that correspond to the 32MB assigned PCI address space of this Bandit.
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// This initialization is implied by the device functionality.
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this->addr_mask = 3 << ((bridge_num & 3) * 2);
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// initial PCI number + chip mode: big endian, interrupts & VGA space disabled
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this->mode_ctrl = ((bridge_num & 3) << 2) | 3;
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this->rd_hold_off_cnt = 8;
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}
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uint32_t BanditPciDevice::pci_cfg_read(uint32_t reg_offs, AccessDetails &details)
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{
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if (reg_offs < 64) {
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return PCIDevice::pci_cfg_read(reg_offs, details);
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}
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switch (reg_offs) {
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case BANDIT_ADDR_MASK:
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return this->addr_mask;
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case BANDIT_MODE_SELECT:
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return this->mode_ctrl;
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case BANDIT_ARBUS_RD_HOLD_OFF:
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return this->rd_hold_off_cnt;
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default:
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LOG_READ_UNIMPLEMENTED_CONFIG_REGISTER();
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}
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return 0;
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}
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void BanditPciDevice::pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &details)
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{
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if (reg_offs < 64) {
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PCIDevice::pci_cfg_write(reg_offs, value, details);
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return;
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}
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switch (reg_offs) {
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case BANDIT_ADDR_MASK:
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this->addr_mask = value;
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this->verbose_address_space();
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return;
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case BANDIT_MODE_SELECT:
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this->mode_ctrl = value;
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return;
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case BANDIT_ARBUS_RD_HOLD_OFF:
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this->rd_hold_off_cnt = value & 0x1F;
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return;
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default:
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LOG_WRITE_UNIMPLEMENTED_CONFIG_REGISTER();
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}
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}
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void BanditPciDevice::verbose_address_space()
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{
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uint32_t mask;
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int bit_pos;
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if (!this->addr_mask) {
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return;
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}
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LOG_F(INFO, "%s address spaces:", this->pci_name.c_str());
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// verbose coarse aka 256MB memory regions
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for (mask = 0x10000, bit_pos = 0; mask != 0x80000000UL; mask <<= 1, bit_pos++) {
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if (this->addr_mask & mask) {
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uint32_t start_addr = bit_pos << 28;
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LOG_F(INFO, "- 0x%X ... 0x%X", start_addr, start_addr + 0x0FFFFFFFU);
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}
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}
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// verbose fine aka 16MB memory regions
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for (mask = 0x1, bit_pos = 0; mask != 0x10000UL; mask <<= 1, bit_pos++) {
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if (this->addr_mask & mask) {
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uint32_t start_addr = (bit_pos << 24) + 0xF0000000UL;
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LOG_F(INFO, "- 0x%X ... 0x%X", start_addr, start_addr + 0x00FFFFFFU);
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}
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}
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}
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uint32_t BanditHost::read(uint32_t rgn_start, uint32_t offset, int size)
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{
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switch (offset >> 22) {
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case 3: // CONFIG_DATA
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int bus_num, dev_num, fun_num;
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uint8_t reg_offs;
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AccessDetails details;
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PCIDevice *device;
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cfg_setup(offset, size, bus_num, dev_num, fun_num, reg_offs, details, device);
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details.flags |= PCI_CONFIG_READ;
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if (device) {
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return pci_conv_rd_data(device->pci_cfg_read(reg_offs, details), details);
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}
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LOG_READ_NON_EXISTENT_PCI_DEVICE();
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return 0xFFFFFFFFUL; // PCI spec §6.1
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case 2: // CONFIG_ADDR
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return BYTESWAP_32(this->config_addr);
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default: // I/O space
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return pci_io_read_broadcast(offset, size);
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}
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}
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void BanditHost::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
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{
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switch (offset >> 22) {
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case 3: // CONFIG_DATA
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int bus_num, dev_num, fun_num;
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uint8_t reg_offs;
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AccessDetails details;
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PCIDevice *device;
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cfg_setup(offset, size, bus_num, dev_num, fun_num, reg_offs, details, device);
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details.flags |= PCI_CONFIG_WRITE;
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if (device) {
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if (size == 4 && !details.offset) { // aligned DWORD writes -> fast path
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device->pci_cfg_write(reg_offs, BYTESWAP_32(value), details);
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return;
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}
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// otherwise perform necessary data transformations -> slow path
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uint32_t old_val = details.size == 4 ? 0 : device->pci_cfg_read(reg_offs, details);
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uint32_t new_val = pci_conv_wr_data(old_val, value, details);
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device->pci_cfg_write(reg_offs, new_val, details);
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return;
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}
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LOG_WRITE_NON_EXISTENT_PCI_DEVICE();
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break;
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case 2: // CONFIG_ADDR
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this->config_addr = BYTESWAP_32(value);
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break;
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default: // I/O space
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pci_io_write_broadcast(offset, size, value);
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}
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}
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inline void BanditHost::cfg_setup(uint32_t offset, int size, int &bus_num,
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int &dev_num, int &fun_num, uint8_t ®_offs,
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AccessDetails &details, PCIDevice *&device)
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{
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device = NULL;
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details.size = size;
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details.offset = offset & 3;
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fun_num = FUN_NUM();
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reg_offs = REG_NUM();
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if (this->config_addr & BANDIT_CAR_TYPE) { // type 1 configuration command
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details.flags = PCI_CONFIG_TYPE_1;
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bus_num = BUS_NUM();
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dev_num = DEV_NUM();
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device = pci_find_device(bus_num, dev_num, fun_num);
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return;
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}
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details.flags = PCI_CONFIG_TYPE_0;
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bus_num = 0; // use dummy value for bus number
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uint32_t idsel = this->config_addr & 0xFFFFF800U;
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if (!SINGLE_BIT_SET(idsel)) {
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for (dev_num = -1, idsel = this->config_addr; idsel; idsel >>= 1, dev_num++) {}
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LOG_F(ERROR, "%s: config_addr 0x%08x does not contain valid IDSEL",
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this->name.c_str(), (uint32_t)this->config_addr);
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return;
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}
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dev_num = WHAT_BIT_SET(idsel);
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if (this->dev_map.count(DEV_FUN(dev_num, fun_num))) {
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device = this->dev_map[DEV_FUN(dev_num, fun_num)];
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}
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}
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int BanditHost::device_postinit()
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{
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std::string pci_dev_name;
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static const std::map<std::string, int> pci_slots = {
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{"pci_A1", DEV_FUN(0xD,0)}, {"pci_B1", DEV_FUN(0xE,0)}, {"pci_C1", DEV_FUN(0xF,0)}
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};
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for (auto& slot : pci_slots) {
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pci_dev_name = GET_STR_PROP(slot.first);
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if (!pci_dev_name.empty()) {
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this->attach_pci_device(pci_dev_name, slot.second);
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}
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}
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return 0;
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}
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Bandit::Bandit(int bridge_num, std::string name, int dev_id, int rev)
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: BanditHost()
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{
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this->name = name;
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supports_types(HWCompType::PCI_HOST);
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this->base_addr = 0xF0000000 + ((bridge_num & 3) << 25);
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MemCtrlBase *mem_ctrl = dynamic_cast<MemCtrlBase *>
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(gMachineObj->get_comp_by_type(HWCompType::MEM_CTRL));
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// add memory mapped I/O region for Bandit control registers
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// This region has the following layout:
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// base_addr + 0x000000 --> I/O space
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// base_addr + 0x800000 --> CONFIG_ADDR
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// base_addr + 0xC00000 --> CONFIG_DATA
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// base_addr + 0x1000000 --> pass-through memory space (not included below)
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mem_ctrl->add_mmio_region(base_addr, 0x01000000, this);
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// connnect Bandit PCI device
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this->my_pci_device = unique_ptr<BanditPciDevice>(
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new BanditPciDevice(bridge_num, name, dev_id, rev)
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);
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this->pci_register_device(DEV_FUN(BANDIT_DEV,0), this->my_pci_device.get());
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}
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Chaos::Chaos(std::string name) : BanditHost()
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{
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this->name = name;
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supports_types(HWCompType::PCI_HOST);
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MemCtrlBase *mem_ctrl = dynamic_cast<MemCtrlBase *>
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(gMachineObj->get_comp_by_type(HWCompType::MEM_CTRL));
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// add memory mapped I/O region for Chaos control registers
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// This region has the following layout:
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// base_addr + 0x800000 --> CONFIG_ADDR
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// base_addr + 0xC00000 --> CONFIG_DATA
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mem_ctrl->add_mmio_region(0xF0000000UL, 0x01000000, this);
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}
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static const PropMap Bandit_Properties = {
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{"pci_A1",
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new StrProperty("")},
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{"pci_B1",
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new StrProperty("")},
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{"pci_C1",
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new StrProperty("")},
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};
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static const DeviceDescription Bandit1_Descriptor = {
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Bandit::create_first, {}, Bandit_Properties
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};
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static const DeviceDescription PsxPci1_Descriptor = {
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Bandit::create_psx_first, {}, Bandit_Properties
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};
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static const DeviceDescription Chaos_Descriptor = {
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Chaos::create, {}, {}
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};
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REGISTER_DEVICE(Bandit1, Bandit1_Descriptor);
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REGISTER_DEVICE(PsxPci1, PsxPci1_Descriptor);
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REGISTER_DEVICE(Chaos, Chaos_Descriptor);
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