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diff --git a/src/core/NEON/kernels/arm_gemm/kernel_weight_format.hpp b/src/core/NEON/kernels/arm_gemm/kernel_weight_format.hpp
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+++ b/src/core/NEON/kernels/arm_gemm/kernel_weight_format.hpp
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+/*
+ * Copyright (c) 2022 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#pragma once
+
+#include "arm_gemm.hpp"
+
+namespace arm_gemm {
+
+/* Internal enum to define the weight format a kernel is expecting.
+ *
+ * This is distinct from the "external" WeightFormat defined in arm_gemm.hpp primarily to allow for SVE, where
+ * internally kernels are defined in terms of multiples of the SVE vector length, but externally they are converted
+ * to a fixed format (based on the VL of the machine we are running on).
+ *
+ * Encoded as a bitfield:
+ *  bit     0 : SVE flag
+ *  bit     4 : BF16 convert flag (fast mode)
+ *  bits 11-8 : block length (bytes)
+ *  bits 15-12: vector count
+ */
+enum class KernelWeightFormat {
+    NON_FIXED        = 0,
+    VL128_BL16       = 0x1200,
+    VL128_BL32       = 0x1400,
+    VL128_BL32_BF16  = 0x1410,
+    VL128_BL64       = 0x1800,
+    VL256_BL64       = 0x2800,
+    VL256_BL64_BF16  = 0x2810,
+    VL1VL_BL16       = 0x1201,
+    VL1VL_BL32       = 0x1401,
+    VL1VL_BL32_BF16  = 0x1411,
+    VL1VL_BL64       = 0x1801,
+    VL2VL_BL64       = 0x2801,
+    VL2VL_BL64_BF16  = 0x2811
+};
+
+WeightFormat get_weight_format(const KernelWeightFormat, size_t);
+
+} // namespace arm_gemm