1 files changed, 57 insertions, 0 deletions
diff --git a/lib/extensions/sve/sve.c b/lib/extensions/sve/sve.c
new file mode 100644
index 0000000..143717e
--- /dev/null
+++ b/lib/extensions/sve/sve.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017-2023, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdbool.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <lib/cassert.h>
+#include <lib/el3_runtime/pubsub.h>
+#include <lib/extensions/sve.h>
+
+CASSERT(SVE_VECTOR_LEN <= 2048, assert_sve_vl_too_long);
+CASSERT(SVE_VECTOR_LEN >= 128, assert_sve_vl_too_short);
+CASSERT((SVE_VECTOR_LEN % 128) == 0, assert_sve_vl_granule);
+
+/*
+ * Converts SVE vector size restriction in bytes to LEN according to ZCR_EL3 documentation.
+ * VECTOR_SIZE = (LEN+1) * 128
+ */
+#define CONVERT_SVE_LENGTH(x)	(((x / 128) - 1))
+
+void sve_enable_per_world(per_world_context_t *per_world_ctx)
+{
+	u_register_t cptr_el3;
+
+	/* Enable access to SVE functionality for all ELs. */
+	cptr_el3 = per_world_ctx->ctx_cptr_el3;
+	cptr_el3 = (cptr_el3 | CPTR_EZ_BIT) & ~(TFP_BIT);
+	per_world_ctx->ctx_cptr_el3 = cptr_el3;
+
+	/* Restrict maximum SVE vector length (SVE_VECTOR_LEN+1) * 128. */
+	per_world_ctx->ctx_zcr_el3 = (ZCR_EL3_LEN_MASK & CONVERT_SVE_LENGTH(SVE_VECTOR_LEN));
+}
+
+void sve_init_el2_unused(void)
+{
+	/*
+	 * CPTR_EL2.TFP: Set to zero so that Non-secure accesses to Advanced
+	 *  SIMD and floating-point functionality from both Execution states do
+	 *  not trap to EL2.
+	 */
+	write_cptr_el2(read_cptr_el2() & ~CPTR_EL2_TFP_BIT);
+}
+
+void sve_disable_per_world(per_world_context_t *per_world_ctx)
+{
+	u_register_t reg;
+
+	/* Disable SVE and FPU since they share registers. */
+	reg = per_world_ctx->ctx_cptr_el3;
+	reg &= ~CPTR_EZ_BIT;	/* Trap SVE */
+	reg |= TFP_BIT;		/* Trap FPU/SIMD */
+	per_world_ctx->ctx_cptr_el3 = reg;
+}