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-rw-r--r--arch/riscv/include/asm/processor.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
new file mode 100644
index 000000000..94a0590c6
--- /dev/null
+++ b/arch/riscv/include/asm/processor.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_PROCESSOR_H
+#define _ASM_RISCV_PROCESSOR_H
+
+#include <linux/const.h>
+
+#include <vdso/processor.h>
+
+#include <asm/ptrace.h>
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
+
+#define STACK_TOP TASK_SIZE
+#ifdef CONFIG_64BIT
+#define STACK_TOP_MAX TASK_SIZE_64
+#else
+#define STACK_TOP_MAX TASK_SIZE
+#endif
+#define STACK_ALIGN 16
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+struct pt_regs;
+
+/* CPU-specific state of a task */
+struct thread_struct {
+ /* Callee-saved registers */
+ unsigned long ra;
+ unsigned long sp; /* Kernel mode stack */
+ unsigned long s[12]; /* s[0]: frame pointer */
+ struct __riscv_d_ext_state fstate;
+ unsigned long bad_cause;
+};
+
+/* Whitelist the fstate from the task_struct for hardened usercopy */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+ unsigned long *size)
+{
+ *offset = offsetof(struct thread_struct, fstate);
+ *size = sizeof_field(struct thread_struct, fstate);
+}
+
+#define INIT_THREAD { \
+ .sp = sizeof(init_stack) + (long)&init_stack, \
+}
+
+#define task_pt_regs(tsk) \
+ ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
+ - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
+
+#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
+#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
+
+
+/* Do necessary setup to start up a newly executed thread. */
+extern void start_thread(struct pt_regs *regs,
+ unsigned long pc, unsigned long sp);
+
+extern unsigned long __get_wchan(struct task_struct *p);
+
+
+static inline void wait_for_interrupt(void)
+{
+ __asm__ __volatile__ ("wfi");
+}
+
+struct device_node;
+int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
+int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
+
+extern void riscv_fill_hwcap(void);
+extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_RISCV_PROCESSOR_H */