initial risc-v exampleHEADmaster

1 files changed, 40 insertions, 0 deletions

diff --git a/riscv/include/asm/current.h b/riscv/include/asm/current.h
new file mode 100644
index 0000000..21774d8
--- /dev/null
+++ b/riscv/include/asm/current.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Based on arm/arm64/include/asm/current.h
+ *
+ * Copyright (C) 2016 ARM
+ * Copyright (C) 2017 SiFive
+ */
+
+
+#ifndef _ASM_RISCV_CURRENT_H
+#define _ASM_RISCV_CURRENT_H
+
+#include <linux/bug.h>
+#include <linux/compiler.h>
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+
+register struct task_struct *riscv_current_is_tp __asm__("tp");
+
+/*
+ * This only works because "struct thread_info" is at offset 0 from "struct
+ * task_struct".  This constraint seems to be necessary on other architectures
+ * as well, but __switch_to enforces it.  We can't check TASK_TI here because
+ * <asm/asm-offsets.h> includes this, and I can't get the definition of "struct
+ * task_struct" here due to some header ordering problems.
+ */
+static __always_inline struct task_struct *get_current(void)
+{
+	return riscv_current_is_tp;
+}
+
+#define current get_current()
+
+register unsigned long current_stack_pointer __asm__("sp");
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_RISCV_CURRENT_H */