mirror of
https://github.com/RGBCube/serenity
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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Debug.h>
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#include <Kernel/IO.h>
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#include <Kernel/PCI/IOAccess.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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namespace PCI {
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UNMAP_AFTER_INIT void IOAccess::initialize()
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{
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if (!Access::is_initialized()) {
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new IOAccess();
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dbgln_if(PCI_DEBUG, "PCI: IO access initialised.");
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}
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}
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UNMAP_AFTER_INIT IOAccess::IOAccess()
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{
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dmesgln("PCI: Using I/O instructions for PCI configuration space access");
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enumerate_hardware([&](const Address& address, ID id) {
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m_physical_ids.append({ address, id, get_capabilities(address) });
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});
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}
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u8 IOAccess::read8_field(Address address, u32 field)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Reading 8-bit field {:#08x} for {}", field, address);
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return Access::early_read8_field(address, field);
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}
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u16 IOAccess::read16_field(Address address, u32 field)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Reading 16-bit field {:#08x} for {}", field, address);
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return Access::early_read16_field(address, field);
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}
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u32 IOAccess::read32_field(Address address, u32 field)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Reading 32-bit field {:#08x} for {}", field, address);
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return Access::early_read32_field(address, field);
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}
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void IOAccess::write8_field(Address address, u32 field, u8 value)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Writing to 8-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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IO::out8(PCI_VALUE_PORT + (field & 3), value);
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}
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void IOAccess::write16_field(Address address, u32 field, u16 value)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Writing to 16-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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IO::out16(PCI_VALUE_PORT + (field & 2), value);
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}
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void IOAccess::write32_field(Address address, u32 field, u32 value)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO Writing to 32-bit field {:#08x}, value={:#02x} for {}", field, value, address);
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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IO::out32(PCI_VALUE_PORT, value);
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}
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void IOAccess::enumerate_hardware(Function<void(Address, ID)> callback)
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{
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dbgln_if(PCI_DEBUG, "PCI: IO enumerating hardware");
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// First scan bus 0. Find any device on that bus, and if it's a PCI-to-PCI
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// bridge, recursively scan it too.
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m_enumerated_buses.set(0, true);
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enumerate_bus(-1, 0, callback, true);
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// Handle Multiple PCI host bridges on slot 0, device 0.
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// If we happen to miss some PCI buses because they are not reachable through
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// recursive PCI-to-PCI bridges starting from bus 0, we might find them here.
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if ((read8_field(Address(), PCI_HEADER_TYPE) & 0x80) != 0) {
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for (int bus = 1; bus < 256; ++bus) {
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if (read16_field(Address(0, 0, 0, bus), PCI_VENDOR_ID) == PCI_NONE)
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continue;
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if (read16_field(Address(0, 0, 0, bus), PCI_CLASS) != 0x6)
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continue;
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if (m_enumerated_buses.get(bus))
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continue;
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enumerate_bus(-1, bus, callback, false);
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m_enumerated_buses.set(bus, true);
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}
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}
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}
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}
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}
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