Add generic implementation handling and SHA2 impl

The skeleton file module/icp/include/generic_impl.c can be used for
iterating over different implementations of algorithms.

It is used by SHA256, SHA512 and BLAKE3 currently.

The Solaris SHA2 implementation got replaced with a version which is
based on public domain code of cppcrypto v0.10.

These assembly files are taken from current openssl master:
- sha256-x86_64.S: x64, SSSE3, AVX, AVX2, SHA-NI (x86_64)
- sha512-x86_64.S: x64, AVX, AVX2 (x86_64)
- sha256-armv7.S: ARMv7, NEON, ARMv8-CE (arm)
- sha512-armv7.S: ARMv7, NEON (arm)
- sha256-armv8.S: ARMv7, NEON, ARMv8-CE (aarch64)
- sha512-armv8.S: ARMv7, ARMv8-CE (aarch64)
- sha256-ppc.S: Generic PPC64 LE/BE (ppc64)
- sha512-ppc.S: Generic PPC64 LE/BE (ppc64)
- sha256-p8.S: Power8 ISA Version 2.07 LE/BE (ppc64)
- sha512-p8.S: Power8 ISA Version 2.07 LE/BE (ppc64)

Tested-by: Rich Ercolani <rincebrain@gmail.com>
Tested-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #13741

module/Makefile.bsd

@@ -13,10 +13,15 @@ KMOD=	openzfs
 	${SRCDIR}/lua \
 	${SRCDIR}/nvpair \
 	${SRCDIR}/icp/algs/blake3 \
+	${SRCDIR}/icp/algs/edonr \
+	${SRCDIR}/icp/algs/sha2 \
 	${SRCDIR}/icp/asm-aarch64/blake3 \
+	${SRCDIR}/icp/asm-aarch64/sha2 \
+	${SRCDIR}/icp/asm-arm/sha2 \
+	${SRCDIR}/icp/asm-ppc64/sha2 \
 	${SRCDIR}/icp/asm-ppc64/blake3 \
 	${SRCDIR}/icp/asm-x86_64/blake3 \
-	${SRCDIR}/icp/algs/edonr \
+	${SRCDIR}/icp/asm-x86_64/sha2 \
 	${SRCDIR}/os/freebsd/spl \
 	${SRCDIR}/os/freebsd/zfs \
 	${SRCDIR}/unicode \
@@ -27,8 +32,6 @@ KMOD=	openzfs
 	${SRCDIR}/zstd/lib/compress \
 	${SRCDIR}/zstd/lib/decompress
 
-
-
 CFLAGS+= -I${INCDIR}
 CFLAGS+= -I${INCDIR}/os/freebsd
 CFLAGS+= -I${INCDIR}/os/freebsd/spl
@@ -88,8 +91,7 @@ SRCS+=	edonr.c
 #icp/algs/blake3
 SRCS+=	blake3.c \
 	blake3_generic.c \
-	blake3_impl.c \
-	blake3_x86-64.c
+	blake3_impl.c
 
 #icp/asm-aarch64/blake3
 SRCS+=	b3_aarch64_sse2.S \
@@ -105,6 +107,29 @@ SRCS+=	blake3_avx2.S \
 	blake3_sse2.S \
 	blake3_sse41.S
 
+#icp/algs/sha2
+SRCS+=	sha2_generic.c \
+	sha256_impl.c \
+	sha512_impl.c
+
+#icp/asm-arm/sha2
+SRCS+=	sha256-armv7.S \
+	sha512-armv7.S
+
+#icp/asm-aarch64/sha2
+SRCS+=	sha256-armv8.S \
+	sha512-armv8.S
+
+#icp/asm-ppc64/sha2
+SRCS+=	sha256-p8.S \
+	sha512-p8.S \
+	sha256-ppc.S \
+	sha512-ppc.S
+
+#icp/asm-x86_64/sha2
+SRCS+=	sha256-x86_64.S \
+	sha512-x86_64.S
+
 #lua
 SRCS+=	lapi.c \
 	lauxlib.c \
@@ -320,6 +345,7 @@ SRCS+=	abd.c \
 	zfs_file_os.c \
 	zfs_fm.c \
 	zfs_fuid.c \
+	zfs_impl.c \
 	zfs_ioctl.c \
 	zfs_log.c \
 	zfs_onexit.c \