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https://github.com/dingusdev/dingusppc.git
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Initial emulation of the Bandit ARBus-to-PCI bridge.
This commit is contained in:
Maxim Poliakovski
parent
74f4dbd7e6
commit
cdb34032bc
149
devices/common/pci/bandit.cpp
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149
devices/common/pci/bandit.cpp
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/*
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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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/** Bandit ARBus-to-PCI Bridge emulation. */
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#include "bandit.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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Bandit::Bandit(int bridge_num, std::string name) : MMIODevice(), PCIHost()
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{
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this->base_addr = 0xF0000000 + ((bridge_num & 3) << 25);
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this->name = name;
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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 format:
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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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// prepare the PCI config header
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std::memset(this->my_pci_cfg_hdr, 0, sizeof(this->my_pci_cfg_hdr));
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WRITE_DWORD_BE_A(&this->my_pci_cfg_hdr[0x00], 0x0001106B);
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WRITE_DWORD_BE_A(&this->my_pci_cfg_hdr[0x08], 0x06000003);
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// mask array for protecting accesses to the PCI config header
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std::memset(this->my_cfg_mask, 0xFF, sizeof(this->my_pci_cfg_hdr));
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WRITE_DWORD_BE_A(&this->my_cfg_mask[0x00], 0); // make DeviceID/VendorID read-only
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WRITE_DWORD_BE_A(&this->my_cfg_mask[0x08], 0); // make ClassCode/Revision read-only
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WRITE_DWORD_BE_A(&this->my_cfg_mask[0x0C], 0xFF00FFFFUL); // make HeaderType read-only
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}
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uint32_t Bandit::read(uint32_t reg_start, uint32_t offset, int size)
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{
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int dev_num, dev_fn;
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uint8_t reg_offs;
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uint32_t result;
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if (offset & BANDIT_CONFIG_SPACE) {
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if (offset & 0x00400000) {
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// access to the CONFIG_DATA pseudo-register causes a Config Cycle
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if (this->config_addr & BANDIT_DEV_NUM) { // access to myself
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result = this->pci_cfg_read(this->config_addr & 0xFFU, size);
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} else {
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dev_num = this->config_addr >> 12;
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dev_fn = this->config_addr >> 8;
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reg_offs = this->config_addr & 0xFFU;
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if (this->dev_map.count(dev_num)) {
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result = this->dev_map[dev_num]->pci_cfg_read(reg_offs, size);
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} else {
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LOG_F(
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ERROR,
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"%s err: read attempt from non-existing PCI device %d \n",
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this->name.c_str(),
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dev_num);
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result = 0;
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}
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}
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} else {
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result = this->config_addr;
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}
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} else { // I/O space access
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LOG_F(WARNING, "%s: I/O space write not implemented yet", this->name.c_str());
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}
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return BYTESWAP_32(result);
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}
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void Bandit::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
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{
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int dev_num, dev_fn;
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uint8_t reg_offs;
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if (offset & BANDIT_CONFIG_SPACE) {
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if (offset & 0x00400000) {
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// access to the CONFIG_DATA pseudo-register causes a Config Cycle
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if (this->config_addr & BANDIT_DEV_NUM) { // access to myself
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this->pci_cfg_write(this->config_addr & 0xFFU, value, size);
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return;
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}
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dev_num = this->config_addr >> 12;
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dev_fn = this->config_addr >> 8;
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reg_offs = this->config_addr & 0xFFU;
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if (this->dev_map.count(dev_num)) {
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this->dev_map[dev_num]->pci_cfg_write(reg_offs, value, size);
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} else {
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LOG_F(
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ERROR,
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"%s err: write attempt to non-existing PCI device %d \n",
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this->name.c_str(),
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dev_num);
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}
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} else {
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this->config_addr = BYTESWAP_32(value) & 0x3FFFFF;
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}
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} else { // I/O space access
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LOG_F(WARNING, "%s: I/O space write not implemented yet", this->name.c_str());
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}
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}
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uint32_t Bandit::pci_cfg_read(uint32_t reg_offs, uint32_t size)
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{
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if ((reg_offs & 3) || size != 4) {
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LOG_F(WARNING, "%s: non-DWORD access to the config space", this->name.c_str());
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}
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return read_mem_rev(&this->my_pci_cfg_hdr[reg_offs], size);
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}
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void Bandit::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
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{
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if ((reg_offs & 3) || size != 4) {
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LOG_F(WARNING, "%s: non-DWORD access to the config space", this->name.c_str());
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}
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uint32_t mask = read_mem_rev(&my_cfg_mask[reg_offs], size);
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uint32_t cur_val = read_mem_rev(&this->my_pci_cfg_hdr[reg_offs], size);
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write_mem_rev(&this->my_pci_cfg_hdr[reg_offs], (cur_val & ~mask) | (value & mask), size);
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}
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68
devices/common/pci/bandit.h
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68
devices/common/pci/bandit.h
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@ -0,0 +1,68 @@
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/*
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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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/** Bandit ARBus-to-PCI bridge definitions.
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The Bandit ASIC is a custom ARBus-to-PCI bridge used in the second
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generation of the Power Macintosh computer equipped with the PCI bus.
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*/
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#ifndef BANDIT_PCI_H
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#define BANDIT_PCI_H
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#include <devices/common/hwcomponent.h>
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#include <devices/common/pci/pcidevice.h>
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#include <devices/common/pci/pcihost.h>
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#include <cinttypes>
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#include <string>
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#include <unordered_map>
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#define BANDIT_DEV_NUM (1 << 11)
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#define BANDIT_CONFIG_SPACE 0x00800000
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class Bandit : public MMIODevice, public PCIHost {//}, public PCIDevice {
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public:
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Bandit(int bridge_num, std::string name);
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~Bandit() = default;
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bool supports_type(HWCompType type) {
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return (type == HWCompType::PCI_HOST || type == HWCompType::PCI_DEV);
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};
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// MMIODevice methods
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uint32_t read(uint32_t reg_start, uint32_t offset, int size);
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void write(uint32_t reg_start, uint32_t offset, uint32_t value, int size);
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protected:
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uint32_t pci_cfg_read(uint32_t reg_offs, uint32_t size);
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void pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size);
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private:
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std::string name;
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uint32_t base_addr;
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uint32_t config_addr;
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uint8_t my_pci_cfg_hdr[256];
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uint8_t my_cfg_mask[256];
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};
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#endif // BANDIT_PCI_H
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