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https://github.com/projectacrn/acrn-hypervisor.git
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ba02583f2d
This patch ports the ACPI parsing module from BITS (BIOS Implementation Test Suite) in order to ease the access to ACPI tables during board XML generation. This library allows accessing ACPI table fields as Python class members, getting rid of hard coding or calculating offsets within tables. Compared to the original library, this port makes the following changes. * Extract only the scripts and functions that contribute to ACPI parsing. * Separate the parser of each ACPI table into different files. * Read raw ACPI tables from Linux sysfs. * Adapt to Python 3. Tracked-On: #5649 Signed-off-by: Junjie Mao <junjie.mao@intel.com>
69 lines
1.8 KiB
Python
69 lines
1.8 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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import ctypes
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import acpiparser.cdata as cdata
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import acpiparser.unpack as unpack
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class TableHeader(cdata.Struct):
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_pack_ = 1
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_fields_ = [
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('signature', ctypes.c_char * 4),
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('length', ctypes.c_uint32),
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('revision', ctypes.c_ubyte),
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('checksum', ctypes.c_ubyte),
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('oemid', ctypes.c_char * 6),
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('oemtableid', ctypes.c_char * 8),
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('oemrevision', ctypes.c_uint32),
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('creatorid', ctypes.c_char * 4),
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('creatorrevision', ctypes.c_uint32),
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]
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ASID_SYSTEM_MEMORY = 0
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ASID_SYSTEM_IO = 1
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ASID_PCI_CFG_SPACE = 2
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ASID_EMBEDDED_CONTROLLER = 3
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ASID_SMBUS = 4
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ASID_PCC = 0xA
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ASID_FFH = 0x7F
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def _asid_str(asid):
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if asid >= 0xC0 and asid <= 0xff:
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return 'OEM Defined'
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_asid = {
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ASID_SYSTEM_MEMORY: 'System Memory',
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ASID_SYSTEM_IO: 'System IO',
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ASID_PCI_CFG_SPACE: 'PCI Configuration Space',
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ASID_EMBEDDED_CONTROLLER: 'Embedded Controller',
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ASID_SMBUS: 'SMBus',
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ASID_PCC: 'Platform Communications Channel (PCC)',
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ASID_FFH: 'Functional Fixed Hardware',
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}
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return _asid.get(asid, 'Reserved')
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_access_sizes = {
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0: 'Undefined',
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1: 'Byte access',
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2: 'Word access',
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3: 'Dword access',
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4: 'Qword access',
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}
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class GAS(cdata.Struct):
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_pack_ = 1
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_fields_ = [
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('address_space_id', ctypes.c_uint8),
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('register_bit_width', ctypes.c_uint8),
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('register_bit_offset', ctypes.c_uint8),
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('access_size', ctypes.c_uint8),
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('address', ctypes.c_uint64),
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]
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_formats = {
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'address_space_id' : unpack.format_function("{:#x}", _asid_str),
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'access_size' : unpack.format_table("{}", _access_sizes),
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}
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