47724c68c2
Switch port I/O based PCI config space access to memory-mapped IO. The base address of the PCI configuration space is acquired by mapping the ACPI ROM and reading the first <bdf> node. An exception is thrown if the first <bdf> node is not for PCI domain zero or if multiple <bdf> nodes exist. This is to reduce complexity and also because multiple PCI domains are rare. The PCI configuration space is accessed via I/O mem dataspace which is created in the platform_drv root and then passed on to the PCI session, device components and finally to the actual PCI config access instances. The memory access code is implemented in a way to make it work with Muen subject monitor (SM) device emulation and also general x86 targets. On Muen, the simplified device emulation code (which works also for Linux) always returns 0xffff in EAX to indicate a non-existing device. Therefore, EAX is enforced in the assembly templates. Fixes #2547
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*
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* \brief platform session component
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* \author Norman Feske
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* \date 2008-01-28
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*/
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/*
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* Copyright (C) 2008-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#include "pci_session_component.h"
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#include "pci_bridge.h"
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static Genode::List<Platform::Bridge> *bridges()
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{
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static Genode::List<Platform::Bridge> list;
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return &list;
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}
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unsigned short Platform::bridge_bdf(unsigned char bus)
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{
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for (Platform::Bridge *bridge = bridges()->first(); bridge;
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bridge = bridge->next())
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{
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if (bridge->part_of(bus))
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return bridge->bdf();
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}
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return 0;
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}
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void Platform::Pci_buses::scan_bus(Config_access &config_access,
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Genode::Allocator &heap, unsigned char bus)
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{
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for (int dev = 0; dev < Device_config::MAX_DEVICES; ++dev) {
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for (int fun = 0; fun < Device_config::MAX_FUNCTIONS; ++fun) {
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/* read config space */
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Device_config config(bus, dev, fun, &config_access);
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if (!config.valid())
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continue;
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/*
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* There is at least one device on the current bus, so
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* we mark it as valid.
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*/
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if (!_valid.get(bus, 1))
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_valid.set(bus, 1);
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/* scan behind bridge */
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if (config.pci_bridge()) {
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/* PCI bridge spec 3.2.5.3, 3.2.5.4 */
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unsigned char sec_bus = config.read(config_access, 0x19,
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Device::ACCESS_8BIT);
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unsigned char sub_bus = config.read(config_access, 0x20,
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Device::ACCESS_8BIT);
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bridges()->insert(new (heap) Bridge(bus, dev, fun, sec_bus,
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sub_bus));
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enum {
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PCI_CMD_REG = 0x4,
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PCI_CMD_MASK = 0x7 /* IOPORT, MEM, DMA */
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};
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unsigned short cmd = config.read(config_access, PCI_CMD_REG,
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Platform::Device::ACCESS_16BIT);
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if ((cmd & PCI_CMD_MASK) != PCI_CMD_MASK) {
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config.write(config_access, PCI_CMD_REG,
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cmd | PCI_CMD_MASK,
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Platform::Device::ACCESS_16BIT);
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}
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Genode::log(config, " - bridge ",
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Hex(sec_bus, Hex::Prefix::OMIT_PREFIX, Hex::Pad::PAD),
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":00.0",
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((cmd & PCI_CMD_MASK) != PCI_CMD_MASK) ? " enabled"
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: "");
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scan_bus(config_access, heap, sec_bus);
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}
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}
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}
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}
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using Platform::Session_component;
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using Genode::Bit_array;
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Bit_array<Session_component::MAX_PCI_DEVICES> Session_component::bdf_in_use;
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