1 # SPDX-License-Identifier: (GPL-2.0-only OR BS 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/tpm/microso 4 $id: http://devicetree.org/schemas/tpm/microsoft,ftpm.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: Microsoft firmware-based Trusted Platfo 7 title: Microsoft firmware-based Trusted Platform Module (fTPM)
8 8
9 maintainers: 9 maintainers:
10 - Thirupathaiah Annapureddy <thiruan@microsof 10 - Thirupathaiah Annapureddy <thiruan@microsoft.com>
11 - Sasha Levin <sashal@kernel.org> 11 - Sasha Levin <sashal@kernel.org>
12 12
13 description: | 13 description: |
14 Commodity CPU architectures, such as ARM and 14 Commodity CPU architectures, such as ARM and Intel CPUs, have started to
15 offer trusted computing features in their CP 15 offer trusted computing features in their CPUs aimed at displacing dedicated
16 trusted hardware. Unfortunately, these CPU 16 trusted hardware. Unfortunately, these CPU architectures raise serious
17 challenges to building trusted systems becau 17 challenges to building trusted systems because they omit providing secure
18 resources outside the CPU perimeter. 18 resources outside the CPU perimeter.
19 19
20 Microsoft's firmware-based TPM 2.0 (fTPM) le 20 Microsoft's firmware-based TPM 2.0 (fTPM) leverages ARM TrustZone to overcome
21 these challenges and provide software with s 21 these challenges and provide software with security guarantees similar to
22 those of dedicated trusted hardware. 22 those of dedicated trusted hardware.
23 23
24 https://www.microsoft.com/en-us/research/pub 24 https://www.microsoft.com/en-us/research/publication/ftpm-software-implementation-tpm-chip/
25 https://github.com/Microsoft/ms-tpm-20-ref/t 25 https://github.com/Microsoft/ms-tpm-20-ref/tree/main/Samples/ARM32-FirmwareTPM
26 26
27 properties: 27 properties:
28 compatible: 28 compatible:
29 const: microsoft,ftpm 29 const: microsoft,ftpm
30 30
31 required: 31 required:
32 - compatible 32 - compatible
33 - linux,sml-base 33 - linux,sml-base
34 - linux,sml-size 34 - linux,sml-size
35 35
36 allOf: 36 allOf:
37 - $ref: tpm-common.yaml# 37 - $ref: tpm-common.yaml#
38 38
39 unevaluatedProperties: false 39 unevaluatedProperties: false
40 40
41 examples: 41 examples:
42 - | 42 - |
43 tpm { 43 tpm {
44 compatible = "microsoft,ftpm"; 44 compatible = "microsoft,ftpm";
45 linux,sml-base = <0x0 0xc0000000>; 45 linux,sml-base = <0x0 0xc0000000>;
46 linux,sml-size = <0x10000>; 46 linux,sml-size = <0x10000>;
47 }; 47 };
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