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2ad01eb5fa
When parameters are sent the PSP returns back it's own signature for the application to verify the authenticity of the result. Display this signature to the caller instead of the one the caller sent. Fixes:f40d42f116("crypto: ccp - Add a sample python script for Dynamic Boost Control") Fixes:febe3ed322("crypto: ccp - Add a sample library for ioctl use") Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
#!/usr/bin/python3
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# SPDX-License-Identifier: GPL-2.0
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import ctypes
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import os
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DBC_UID_SIZE = 16
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DBC_NONCE_SIZE = 16
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DBC_SIG_SIZE = 32
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PARAM_GET_FMAX_CAP = (0x3,)
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PARAM_SET_FMAX_CAP = (0x4,)
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PARAM_GET_PWR_CAP = (0x5,)
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PARAM_SET_PWR_CAP = (0x6,)
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PARAM_GET_GFX_MODE = (0x7,)
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PARAM_SET_GFX_MODE = (0x8,)
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PARAM_GET_CURR_TEMP = (0x9,)
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PARAM_GET_FMAX_MAX = (0xA,)
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PARAM_GET_FMAX_MIN = (0xB,)
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PARAM_GET_SOC_PWR_MAX = (0xC,)
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PARAM_GET_SOC_PWR_MIN = (0xD,)
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PARAM_GET_SOC_PWR_CUR = (0xE,)
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DEVICE_NODE = "/dev/dbc"
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lib = ctypes.CDLL("./dbc_library.so", mode=ctypes.RTLD_GLOBAL)
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def handle_error(code):
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raise OSError(code, os.strerror(code))
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def get_nonce(device, signature):
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if not device:
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raise ValueError("Device required")
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buf = ctypes.create_string_buffer(DBC_NONCE_SIZE)
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ret = lib.get_nonce(device.fileno(), ctypes.byref(buf), signature)
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if ret:
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handle_error(ret)
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return buf.value
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def set_uid(device, new_uid, signature):
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if not signature:
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raise ValueError("Signature required")
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if not new_uid:
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raise ValueError("UID required")
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ret = lib.set_uid(device.fileno(), new_uid, signature)
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if ret:
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handle_error(ret)
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return True
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def process_param(device, message, signature, data=None):
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if not signature:
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raise ValueError("Signature required")
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if type(message) != tuple:
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raise ValueError("Expected message tuple")
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arg = ctypes.c_int(data if data else 0)
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sig = ctypes.create_string_buffer(signature, len(signature))
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ret = lib.process_param(device.fileno(), message[0], ctypes.pointer(sig), ctypes.pointer(arg))
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if ret:
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handle_error(ret)
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return arg.value, sig.value
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