arch/powerpc/crypto/Kconfig

Source file repositories/reference/linux-study-clean/arch/powerpc/crypto/Kconfig

File Facts

System
Linux kernel
Corpus path
arch/powerpc/crypto/Kconfig
Extension
[no extension]
Size
2103 bytes
Lines
65
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: build/configuration rule
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0

menu "Accelerated Cryptographic Algorithms for CPU (powerpc)"

config CRYPTO_AES_PPC_SPE
	tristate "Ciphers: AES, modes: ECB/CBC/CTR/XTS (SPE)"
	depends on SPE
	select CRYPTO_LIB_AES
	select CRYPTO_SKCIPHER
	help
	  Length-preserving ciphers: AES with ECB, CBC, CTR, and XTS modes

	  Architecture: powerpc using:
	  - SPE (Signal Processing Engine) extensions

	  SPE is available for:
	  - Processor Type: Freescale 8500
	  - CPU selection: e500 (8540)

	  This module should only be used for low power (router) devices
	  without hardware AES acceleration (e.g. caam crypto). It reduces the
	  size of the AES tables from 16KB to 8KB + 256 bytes and mitigates
	  timining attacks. Nevertheless it might be not as secure as other
	  architecture specific assembler implementations that work on 1KB
	  tables or 256 bytes S-boxes.

config CRYPTO_AES_GCM_P10
	tristate "Stitched AES/GCM acceleration support on P10 or later CPU (PPC)"
	depends on PPC64 && CPU_LITTLE_ENDIAN && VSX
	select CRYPTO_LIB_AES
	select CRYPTO_ALGAPI
	select CRYPTO_AEAD
	select CRYPTO_SKCIPHER
	select CRYPTO_SIMD
	help
	  AEAD cipher: AES cipher algorithms (FIPS-197)
	  GCM (Galois/Counter Mode) authenticated encryption mode (NIST SP800-38D)
	  Architecture: powerpc64 using:
	    - little-endian
	    - Power10 or later features

	  Support for cryptographic acceleration instructions on Power10 or
	  later CPU. This module supports stitched acceleration for AES/GCM.

config CRYPTO_DEV_VMX
        bool "Support for VMX cryptographic acceleration instructions"
        depends on PPC64 && VSX
        help
          Support for VMX cryptographic acceleration instructions.

config CRYPTO_DEV_VMX_ENCRYPT
	tristate "Encryption acceleration support on P8 CPU"
	depends on CRYPTO_DEV_VMX
	select CRYPTO_AES
	select CRYPTO_CBC
	select CRYPTO_CTR
	select CRYPTO_XTS
	default m
	help
	  Support for VMX cryptographic acceleration instructions on Power8 CPU.
	  This module supports acceleration for AES in hardware. If you choose
	  'M' here, this module will be called vmx-crypto.

endmenu

Annotation

Implementation Notes