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https://github.com/projectacrn/acrn-hypervisor.git
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0991f7f03b
This patch adds a parser to the PCI routing tables returned by _PRT objects
of platform devices. The parsed result is a list of PRTMappingPackage
instances, each of which is a named tuple with the following fields:
* address: a dword with higher 16 bits being the function number and
lower 16 bits all 1's.
* pin: a byte representing the mapped pin.
* source: either a DeviceDecl of the device that allocates the interrupt
line, or the byte 0.
* source_index:
- If `source` is a DeviceDecl, this is the index of the interrupt
source within that device.
- If `source` is 0, this is the interrupt line connected to the pin.
Tracked-On: #6287
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
35 lines
1.1 KiB
Python
35 lines
1.1 KiB
Python
# Copyright (C) 2021 Intel Corporation. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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from collections import namedtuple
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from .aml import datatypes, context
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class PRTMappingPackage(namedtuple("PRTMappingPackage", ["address", "pin", "source", "source_index"])):
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def __repr__(self):
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if isinstance(self.source, context.DeviceDecl):
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s = self.source.name
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else:
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s = str(self.source)
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return "address=0x{0:08x}, pin=0x{1:02x}, source={2}, source_index=0x{3:08x}".format(
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self.address, self.pin, s, self.source_index)
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def parse_prt_mapping(x):
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address = x.elements[0].get()
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pin = x.elements[1].get()
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source = x.elements[2]
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if isinstance(source, datatypes.Device):
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source = source.get_sym()
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elif isinstance(source, datatypes.Integer):
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source = source.get()
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else:
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source = "unknown"
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source_index = x.elements[3].get()
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return PRTMappingPackage(address, pin, source, source_index)
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def parse_pci_routing(package):
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"""Parse ACPI PCI routing table returned by _PRT control methods."""
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return list(map(parse_prt_mapping, package.elements))
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