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-rw-r--r--arch/riscv/kernel/fpu.S106
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/riscv/kernel/fpu.S b/arch/riscv/kernel/fpu.S
new file mode 100644
index 000000000000..1defb0618aff
--- /dev/null
+++ b/arch/riscv/kernel/fpu.S
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/asm-offsets.h>
+
+ENTRY(__fstate_save)
+ li a2, TASK_THREAD_F0
+ add a0, a0, a2
+ li t1, SR_FS
+ csrs sstatus, t1
+ frcsr t0
+ fsd f0, TASK_THREAD_F0_F0(a0)
+ fsd f1, TASK_THREAD_F1_F0(a0)
+ fsd f2, TASK_THREAD_F2_F0(a0)
+ fsd f3, TASK_THREAD_F3_F0(a0)
+ fsd f4, TASK_THREAD_F4_F0(a0)
+ fsd f5, TASK_THREAD_F5_F0(a0)
+ fsd f6, TASK_THREAD_F6_F0(a0)
+ fsd f7, TASK_THREAD_F7_F0(a0)
+ fsd f8, TASK_THREAD_F8_F0(a0)
+ fsd f9, TASK_THREAD_F9_F0(a0)
+ fsd f10, TASK_THREAD_F10_F0(a0)
+ fsd f11, TASK_THREAD_F11_F0(a0)
+ fsd f12, TASK_THREAD_F12_F0(a0)
+ fsd f13, TASK_THREAD_F13_F0(a0)
+ fsd f14, TASK_THREAD_F14_F0(a0)
+ fsd f15, TASK_THREAD_F15_F0(a0)
+ fsd f16, TASK_THREAD_F16_F0(a0)
+ fsd f17, TASK_THREAD_F17_F0(a0)
+ fsd f18, TASK_THREAD_F18_F0(a0)
+ fsd f19, TASK_THREAD_F19_F0(a0)
+ fsd f20, TASK_THREAD_F20_F0(a0)
+ fsd f21, TASK_THREAD_F21_F0(a0)
+ fsd f22, TASK_THREAD_F22_F0(a0)
+ fsd f23, TASK_THREAD_F23_F0(a0)
+ fsd f24, TASK_THREAD_F24_F0(a0)
+ fsd f25, TASK_THREAD_F25_F0(a0)
+ fsd f26, TASK_THREAD_F26_F0(a0)
+ fsd f27, TASK_THREAD_F27_F0(a0)
+ fsd f28, TASK_THREAD_F28_F0(a0)
+ fsd f29, TASK_THREAD_F29_F0(a0)
+ fsd f30, TASK_THREAD_F30_F0(a0)
+ fsd f31, TASK_THREAD_F31_F0(a0)
+ sw t0, TASK_THREAD_FCSR_F0(a0)
+ csrc sstatus, t1
+ ret
+ENDPROC(__fstate_save)
+
+ENTRY(__fstate_restore)
+ li a2, TASK_THREAD_F0
+ add a0, a0, a2
+ li t1, SR_FS
+ lw t0, TASK_THREAD_FCSR_F0(a0)
+ csrs sstatus, t1
+ fld f0, TASK_THREAD_F0_F0(a0)
+ fld f1, TASK_THREAD_F1_F0(a0)
+ fld f2, TASK_THREAD_F2_F0(a0)
+ fld f3, TASK_THREAD_F3_F0(a0)
+ fld f4, TASK_THREAD_F4_F0(a0)
+ fld f5, TASK_THREAD_F5_F0(a0)
+ fld f6, TASK_THREAD_F6_F0(a0)
+ fld f7, TASK_THREAD_F7_F0(a0)
+ fld f8, TASK_THREAD_F8_F0(a0)
+ fld f9, TASK_THREAD_F9_F0(a0)
+ fld f10, TASK_THREAD_F10_F0(a0)
+ fld f11, TASK_THREAD_F11_F0(a0)
+ fld f12, TASK_THREAD_F12_F0(a0)
+ fld f13, TASK_THREAD_F13_F0(a0)
+ fld f14, TASK_THREAD_F14_F0(a0)
+ fld f15, TASK_THREAD_F15_F0(a0)
+ fld f16, TASK_THREAD_F16_F0(a0)
+ fld f17, TASK_THREAD_F17_F0(a0)
+ fld f18, TASK_THREAD_F18_F0(a0)
+ fld f19, TASK_THREAD_F19_F0(a0)
+ fld f20, TASK_THREAD_F20_F0(a0)
+ fld f21, TASK_THREAD_F21_F0(a0)
+ fld f22, TASK_THREAD_F22_F0(a0)
+ fld f23, TASK_THREAD_F23_F0(a0)
+ fld f24, TASK_THREAD_F24_F0(a0)
+ fld f25, TASK_THREAD_F25_F0(a0)
+ fld f26, TASK_THREAD_F26_F0(a0)
+ fld f27, TASK_THREAD_F27_F0(a0)
+ fld f28, TASK_THREAD_F28_F0(a0)
+ fld f29, TASK_THREAD_F29_F0(a0)
+ fld f30, TASK_THREAD_F30_F0(a0)
+ fld f31, TASK_THREAD_F31_F0(a0)
+ fscsr t0
+ csrc sstatus, t1
+ ret
+ENDPROC(__fstate_restore)