1 files changed, 84 insertions, 0 deletions
diff --git a/arch/nds32/kernel/sys_nds32.c b/arch/nds32/kernel/sys_nds32.c
new file mode 100644
index 000000000..cb2d1e219
--- /dev/null
+++ b/arch/nds32/kernel/sys_nds32.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/cachectl.h>
+#include <asm/proc-fns.h>
+#include <asm/fpu.h>
+#include <asm/fp_udfiex_crtl.h>
+
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+	       unsigned long, prot, unsigned long, flags,
+	       unsigned long, fd, unsigned long, pgoff)
+{
+	if (pgoff & (~PAGE_MASK >> 12))
+		return -EINVAL;
+
+	return sys_mmap_pgoff(addr, len, prot, flags, fd,
+			      pgoff >> (PAGE_SHIFT - 12));
+}
+
+SYSCALL_DEFINE4(fadvise64_64_wrapper,int, fd, int, advice, loff_t, offset,
+					 loff_t, len)
+{
+	return sys_fadvise64_64(fd, offset, len, advice);
+}
+
+SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache)
+{
+	struct vm_area_struct *vma;
+	bool flushi = true, wbd = true;
+
+	vma = find_vma(current->mm, start);
+	if (!vma)
+		return -EFAULT;
+	switch (cache) {
+	case ICACHE:
+		wbd = false;
+		break;
+	case DCACHE:
+		flushi = false;
+		break;
+	case BCACHE:
+		break;
+	default:
+		return -EINVAL;
+	}
+	cpu_cache_wbinval_range_check(vma, start, end, flushi, wbd);
+
+	return 0;
+}
+
+SYSCALL_DEFINE2(fp_udfiex_crtl, unsigned int, cmd, unsigned int, act)
+{
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+	int old_udf_iex;
+
+	if (!used_math()) {
+		load_fpu(&init_fpuregs);
+		current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
+		set_used_math();
+	}
+
+	old_udf_iex = current->thread.fpu.UDF_IEX_trap;
+	act &= (FPCSR_mskUDFE | FPCSR_mskIEXE);
+
+	switch (cmd) {
+	case DISABLE_UDF_IEX_TRAP:
+		current->thread.fpu.UDF_IEX_trap &= ~act;
+		break;
+	case ENABLE_UDF_IEX_TRAP:
+		current->thread.fpu.UDF_IEX_trap |= act;
+		break;
+	case GET_UDF_IEX_TRAP:
+		break;
+	default:
+		return -EINVAL;
+	}
+	return old_udf_iex;
+#else
+	return -ENOTSUPP;
+#endif
+}