1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm64/kernel/entry-fpsimd.S b/arch/arm64/kernel/entry-fpsimd.S
new file mode 100644
index 000000000..2ca395c25
--- /dev/null
+++ b/arch/arm64/kernel/entry-fpsimd.S
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * FP/SIMD state saving and restoring
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/fpsimdmacros.h>
+
+/*
+ * Save the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+SYM_FUNC_START(fpsimd_save_state)
+	fpsimd_save x0, 8
+	ret
+SYM_FUNC_END(fpsimd_save_state)
+
+/*
+ * Load the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+SYM_FUNC_START(fpsimd_load_state)
+	fpsimd_restore x0, 8
+	ret
+SYM_FUNC_END(fpsimd_load_state)
+
+#ifdef CONFIG_ARM64_SVE
+
+SYM_FUNC_START(sve_save_state)
+	sve_save 0, x1, 2
+	ret
+SYM_FUNC_END(sve_save_state)
+
+SYM_FUNC_START(sve_load_state)
+	sve_load 0, x1, x2, 3, x4
+	ret
+SYM_FUNC_END(sve_load_state)
+
+SYM_FUNC_START(sve_get_vl)
+	_sve_rdvl	0, 1
+	ret
+SYM_FUNC_END(sve_get_vl)
+
+/*
+ * Load SVE state from FPSIMD state.
+ *
+ * x0 = pointer to struct fpsimd_state
+ * x1 = VQ - 1
+ *
+ * Each SVE vector will be loaded with the first 128-bits taken from FPSIMD
+ * and the rest zeroed. All the other SVE registers will be zeroed.
+ */
+SYM_FUNC_START(sve_load_from_fpsimd_state)
+		sve_load_vq	x1, x2, x3
+		fpsimd_restore	x0, 8
+ _for n, 0, 15, _sve_pfalse	\n
+		_sve_wrffr	0
+		ret
+SYM_FUNC_END(sve_load_from_fpsimd_state)
+
+/* Zero all SVE registers but the first 128-bits of each vector */
+SYM_FUNC_START(sve_flush_live)
+	sve_flush
+	ret
+SYM_FUNC_END(sve_flush_live)
+
+#endif /* CONFIG_ARM64_SVE */