1 files changed, 122 insertions, 0 deletions
diff --git a/arch/x86/include/asm/crypto/glue_helper.h b/arch/x86/include/asm/crypto/glue_helper.h
new file mode 100644
index 000000000..d1818634a
--- /dev/null
+++ b/arch/x86/include/asm/crypto/glue_helper.h
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared glue code for 128bit block ciphers
+ */
+
+#ifndef _CRYPTO_GLUE_HELPER_H
+#define _CRYPTO_GLUE_HELPER_H
+
+#include <crypto/internal/skcipher.h>
+#include <linux/kernel.h>
+#include <asm/fpu/api.h>
+#include <crypto/b128ops.h>
+
+typedef void (*common_glue_func_t)(void *ctx, u8 *dst, const u8 *src);
+typedef void (*common_glue_cbc_func_t)(void *ctx, u128 *dst, const u128 *src);
+typedef void (*common_glue_ctr_func_t)(void *ctx, u128 *dst, const u128 *src,
+				       le128 *iv);
+typedef void (*common_glue_xts_func_t)(void *ctx, u128 *dst, const u128 *src,
+				       le128 *iv);
+
+#define GLUE_FUNC_CAST(fn) ((common_glue_func_t)(fn))
+#define GLUE_CBC_FUNC_CAST(fn) ((common_glue_cbc_func_t)(fn))
+#define GLUE_CTR_FUNC_CAST(fn) ((common_glue_ctr_func_t)(fn))
+#define GLUE_XTS_FUNC_CAST(fn) ((common_glue_xts_func_t)(fn))
+
+struct common_glue_func_entry {
+	unsigned int num_blocks; /* number of blocks that @fn will process */
+	union {
+		common_glue_func_t ecb;
+		common_glue_cbc_func_t cbc;
+		common_glue_ctr_func_t ctr;
+		common_glue_xts_func_t xts;
+	} fn_u;
+};
+
+struct common_glue_ctx {
+	unsigned int num_funcs;
+	int fpu_blocks_limit; /* -1 means fpu not needed at all */
+
+	/*
+	 * First funcs entry must have largest num_blocks and last funcs entry
+	 * must have num_blocks == 1!
+	 */
+	struct common_glue_func_entry funcs[];
+};
+
+static inline bool glue_fpu_begin(unsigned int bsize, int fpu_blocks_limit,
+				  struct skcipher_walk *walk,
+				  bool fpu_enabled, unsigned int nbytes)
+{
+	if (likely(fpu_blocks_limit < 0))
+		return false;
+
+	if (fpu_enabled)
+		return true;
+
+	/*
+	 * Vector-registers are only used when chunk to be processed is large
+	 * enough, so do not enable FPU until it is necessary.
+	 */
+	if (nbytes < bsize * (unsigned int)fpu_blocks_limit)
+		return false;
+
+	/* prevent sleeping if FPU is in use */
+	skcipher_walk_atomise(walk);
+
+	kernel_fpu_begin();
+	return true;
+}
+
+static inline void glue_fpu_end(bool fpu_enabled)
+{
+	if (fpu_enabled)
+		kernel_fpu_end();
+}
+
+static inline void le128_to_be128(be128 *dst, const le128 *src)
+{
+	dst->a = cpu_to_be64(le64_to_cpu(src->a));
+	dst->b = cpu_to_be64(le64_to_cpu(src->b));
+}
+
+static inline void be128_to_le128(le128 *dst, const be128 *src)
+{
+	dst->a = cpu_to_le64(be64_to_cpu(src->a));
+	dst->b = cpu_to_le64(be64_to_cpu(src->b));
+}
+
+static inline void le128_inc(le128 *i)
+{
+	u64 a = le64_to_cpu(i->a);
+	u64 b = le64_to_cpu(i->b);
+
+	b++;
+	if (!b)
+		a++;
+
+	i->a = cpu_to_le64(a);
+	i->b = cpu_to_le64(b);
+}
+
+extern int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
+			       struct skcipher_request *req);
+
+extern int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
+				       struct skcipher_request *req);
+
+extern int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
+				       struct skcipher_request *req);
+
+extern int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
+			       struct skcipher_request *req);
+
+extern int glue_xts_req_128bit(const struct common_glue_ctx *gctx,
+			       struct skcipher_request *req,
+			       common_glue_func_t tweak_fn, void *tweak_ctx,
+			       void *crypt_ctx);
+
+extern void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src,
+				      le128 *iv, common_glue_func_t fn);
+
+#endif /* _CRYPTO_GLUE_HELPER_H */