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-rw-r--r--arch/loongarch/include/asm/vdso/vdso.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/vdso/vdso.h b/arch/loongarch/include/asm/vdso/vdso.h
new file mode 100644
index 000000000..3b55d32a0
--- /dev/null
+++ b/arch/loongarch/include/asm/vdso/vdso.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Author: Huacai Chen <chenhuacai@loongson.cn>
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASSEMBLY__
+
+#include <asm/asm.h>
+#include <asm/page.h>
+#include <asm/vdso.h>
+
+struct vdso_pcpu_data {
+ u32 node;
+} ____cacheline_aligned_in_smp;
+
+struct loongarch_vdso_data {
+ struct vdso_pcpu_data pdata[NR_CPUS];
+ struct vdso_data data[CS_BASES]; /* Arch-independent data */
+};
+
+#define VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
+
+static inline unsigned long get_vdso_base(void)
+{
+ unsigned long addr;
+
+ __asm__(
+ " la.pcrel %0, _start\n"
+ : "=r" (addr)
+ :
+ :);
+
+ return addr;
+}
+
+static inline const struct vdso_data *get_vdso_data(void)
+{
+ return (const struct vdso_data *)(get_vdso_base()
+ - VDSO_DATA_SIZE + SMP_CACHE_BYTES * NR_CPUS);
+}
+
+#endif /* __ASSEMBLY__ */