1 files changed, 127 insertions, 0 deletions
diff --git a/core/arch/arm/include/kernel/vfp.h b/core/arch/arm/include/kernel/vfp.h
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+++ b/core/arch/arm/include/kernel/vfp.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef KERNEL_VFP_H
+#define KERNEL_VFP_H
+
+#include <types_ext.h>
+#include <compiler.h>
+
+#ifdef ARM32
+/*
+ * Advanced SIMD/floating point state on ARMv7-A or ARMv8-A AArch32 has:
+ * - 32 64-bit data registers
+ * - FPSCR (32 bits)
+ * - FPEXC (32 bits)
+ */
+
+#define VFP_NUM_REGS	32
+
+struct vfp_reg {
+	uint64_t v;
+};
+
+struct vfp_state {
+	uint32_t fpexc;
+	uint32_t fpscr;
+	struct vfp_reg reg[VFP_NUM_REGS];
+};
+#endif
+
+#ifdef ARM64
+/*
+ * Advanced SIMD/floating point state on ARMv8-A AArch64 has:
+ * - 32 128-bit data registers
+ * - FPSR (32 bits)
+ * - FPCR (32 bits)
+ * - CPACR_EL1.FPEN (2 bits)
+ */
+
+#define VFP_NUM_REGS	32
+
+struct vfp_reg {
+	uint8_t v[16];
+} __aligned(16);
+
+struct vfp_state {
+	struct vfp_reg reg[VFP_NUM_REGS];
+	uint32_t fpsr;
+	uint32_t fpcr;
+	uint32_t cpacr_el1;
+	bool force_save; /* Save to reg even if VFP was not enabled */
+};
+#endif
+
+#ifdef CFG_WITH_VFP
+/* vfp_is_enabled() - Returns true if VFP is enabled */
+bool vfp_is_enabled(void);
+
+/* vfp_enable() - Enables vfp */
+void vfp_enable(void);
+
+/* vfp_disable() - Disables vfp */
+void vfp_disable(void);
+#else
+static inline bool vfp_is_enabled(void)
+{
+	return false;
+}
+
+static inline void vfp_enable(void)
+{
+}
+
+static inline void vfp_disable(void)
+{
+}
+#endif
+
+/*
+ * vfp_lazy_save_state_init() - Saves VFP enable status and disables VFP
+ * @state:	VFP state structure to initialize
+ */
+void vfp_lazy_save_state_init(struct vfp_state *state);
+
+/*
+ * vfp_lazy_save_state_final() - Saves rest of VFP state
+ * @state:	VFP state to save to
+ *
+ * If VFP was enabled when vfp_lazy_save_state_init() was called: save rest
+ * of state and disable VFP. Otherwise, do nothing.
+ */
+void vfp_lazy_save_state_final(struct vfp_state *state);
+
+/*
+ * vfp_lazy_restore_state() - Lazy restore VFP state
+ * @state:		VFP state to restore
+ *
+ * Restores VFP enable status and also restores rest of VFP state if
+ * vfp_lazy_save_state_final() was called on this state.
+ */
+void vfp_lazy_restore_state(struct vfp_state *state, bool full_state);
+
+#endif /*KERNEL_VFP_H*/