1 files changed, 104 insertions, 0 deletions
diff --git a/arch/csky/kernel/process.c b/arch/csky/kernel/process.c
new file mode 100644
index 0000000000..0c6e4b17fe
--- /dev/null
+++ b/arch/csky/kernel/process.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/sched/debug.h>
+#include <linux/delay.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
+#include <linux/elfcore.h>
+
+#include <asm/elf.h>
+#include <abi/reg_ops.h>
+
+struct cpuinfo_csky cpu_data[NR_CPUS];
+
+#ifdef CONFIG_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+
+/*
+ * Some archs flush debug and FPU info here
+ */
+void flush_thread(void){}
+
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+	unsigned long clone_flags = args->flags;
+	unsigned long usp = args->stack;
+	unsigned long tls = args->tls;
+	struct switch_stack *childstack;
+	struct pt_regs *childregs = task_pt_regs(p);
+
+#ifdef CONFIG_CPU_HAS_FPU
+	save_to_user_fp(&p->thread.user_fp);
+#endif
+
+	childstack = ((struct switch_stack *) childregs) - 1;
+	memset(childstack, 0, sizeof(struct switch_stack));
+
+	/* setup thread.sp for switch_to !!! */
+	p->thread.sp = (unsigned long)childstack;
+
+	if (unlikely(args->fn)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		childstack->r15 = (unsigned long) ret_from_kernel_thread;
+		childstack->r10 = (unsigned long) args->fn_arg;
+		childstack->r9 = (unsigned long) args->fn;
+		childregs->sr = mfcr("psr");
+	} else {
+		*childregs = *(current_pt_regs());
+		if (usp)
+			childregs->usp = usp;
+		if (clone_flags & CLONE_SETTLS)
+			task_thread_info(p)->tp_value = childregs->tls
+						      = tls;
+
+		childregs->a0 = 0;
+		childstack->r15 = (unsigned long) ret_from_fork;
+	}
+
+	return 0;
+}
+
+/* Fill in the fpu structure for a core dump.  */
+int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
+{
+	memcpy(fpu, &current->thread.user_fp, sizeof(*fpu));
+	return 1;
+}
+
+int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
+{
+	struct pt_regs *regs = task_pt_regs(tsk);
+
+	/* NOTE: usp is error value. */
+	ELF_CORE_COPY_REGS((*pr_regs), regs)
+
+	return 1;
+}
+
+#ifndef CONFIG_CPU_PM_NONE
+void arch_cpu_idle(void)
+{
+#ifdef CONFIG_CPU_PM_WAIT
+	asm volatile("wait\n");
+#endif
+
+#ifdef CONFIG_CPU_PM_DOZE
+	asm volatile("doze\n");
+#endif
+
+#ifdef CONFIG_CPU_PM_STOP
+	asm volatile("stop\n");
+#endif
+}
+#endif