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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/PCI/IOAccess.h>
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#include <LibBareMetal/IO.h>
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namespace Kernel {
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void PCI::IOAccess::initialize()
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{
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if (!PCI::Access::is_initialized())
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new PCI::IOAccess();
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}
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PCI::IOAccess::IOAccess()
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{
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klog() << "PCI: Using IO Mechanism for PCI Configuartion Space Access";
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}
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u8 PCI::IOAccess::read8_field(Address address, u32 field)
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{
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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return IO::in8(PCI_VALUE_PORT + (field & 3));
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}
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u16 PCI::IOAccess::read16_field(Address address, u32 field)
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{
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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return IO::in16(PCI_VALUE_PORT + (field & 2));
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}
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u32 PCI::IOAccess::read32_field(Address address, u32 field)
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{
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IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
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return IO::in32(PCI_VALUE_PORT);
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}
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void PCI::IOAccess::write8_field(Address address, u32 field, u8 value)
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{
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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 PCI::IOAccess::write16_field(Address address, u32 field, u16 value)
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{
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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 PCI::IOAccess::write32_field(Address address, u32 field, u32 value)
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{
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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 PCI::IOAccess::enumerate_all(Function<void(Address, ID)>& callback)
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{
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// Single PCI host controller.
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if ((read8_field(Address(), PCI_HEADER_TYPE) & 0x80) == 0) {
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enumerate_bus(-1, 0, callback);
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return;
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}
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// Multiple PCI host controllers.
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for (u8 function = 0; function < 8; ++function) {
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if (read16_field(Address(0, 0, 0, function), PCI_VENDOR_ID) == PCI_NONE)
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break;
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enumerate_bus(-1, function, callback);
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}
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}
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}
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