x86/crc32: expose CRC32 functions through lib

Move the x86 CRC32 assembly code into the lib directory and wire it up
to the library interface.  This allows it to be used without going
through the crypto API.  It remains usable via the crypto API too via
the shash algorithms that use the library interface.  Thus all the
arch-specific "shash" code becomes unnecessary and is removed.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20241202010844.144356-14-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

Author: ebiggers

arch/x86/Kconfig

@@ -76,6 +76,7 @@ config X86
 	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
 	select ARCH_HAS_CPU_FINALIZE_INIT
 	select ARCH_HAS_CPU_PASID		if IOMMU_SVA
+	select ARCH_HAS_CRC32
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE

arch/x86/crypto/Kconfig

@@ -492,28 +492,6 @@ config CRYPTO_GHASH_CLMUL_NI_INTEL
 	  Architecture: x86_64 using:
 	  - CLMUL-NI (carry-less multiplication new instructions)
 
-config CRYPTO_CRC32C_INTEL
-	tristate "CRC32c (SSE4.2/PCLMULQDQ)"
-	depends on X86
-	select CRYPTO_HASH
-	help
-	  CRC32c CRC algorithm with the iSCSI polynomial (RFC 3385 and RFC 3720)
-
-	  Architecture: x86 (32-bit and 64-bit) using:
-	  - SSE4.2 (Streaming SIMD Extensions 4.2) CRC32 instruction
-	  - PCLMULQDQ (carry-less multiplication)
-
-config CRYPTO_CRC32_PCLMUL
-	tristate "CRC32 (PCLMULQDQ)"
-	depends on X86
-	select CRYPTO_HASH
-	select CRC32
-	help
-	  CRC32 CRC algorithm (IEEE 802.3)
-
-	  Architecture: x86 (32-bit and 64-bit) using:
-	  - PCLMULQDQ (carry-less multiplication)
-
 config CRYPTO_CRCT10DIF_PCLMUL
 	tristate "CRCT10DIF (PCLMULQDQ)"
 	depends on X86 && 64BIT && CRC_T10DIF

arch/x86/crypto/Makefile

@@ -75,13 +75,6 @@ ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o
 obj-$(CONFIG_CRYPTO_POLYVAL_CLMUL_NI) += polyval-clmulni.o
 polyval-clmulni-y := polyval-clmulni_asm.o polyval-clmulni_glue.o
 
-obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o
-crc32c-intel-y := crc32c-intel_glue.o
-crc32c-intel-$(CONFIG_64BIT) += crc32c-pcl-intel-asm_64.o
-
-obj-$(CONFIG_CRYPTO_CRC32_PCLMUL) += crc32-pclmul.o
-crc32-pclmul-y := crc32-pclmul_asm.o crc32-pclmul_glue.o
-
 obj-$(CONFIG_CRYPTO_CRCT10DIF_PCLMUL) += crct10dif-pclmul.o
 crct10dif-pclmul-y := crct10dif-pcl-asm_64.o crct10dif-pclmul_glue.o