arch/loongarch/include/asm/vdso.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Author: Huacai Chen <chenhuacai@loongson.cn>
   4  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   5  */
   6
   7 #ifndef __ASM_VDSO_H
   8 #define __ASM_VDSO_H
   9
  10 #include <linux/mm.h>
  11 #include <linux/mm_types.h>
  12 #include <vdso/datapage.h>
  13
  14 #include <asm/barrier.h>
  15
  16 /*
  17  * struct loongarch_vdso_info - Details of a VDSO image.
  18  * @vdso: Pointer to VDSO image (page-aligned).
  19  * @size: Size of the VDSO image (page-aligned).
  20  * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline.
  21  * @code_mapping: Special mapping structure for vdso code.
  22  * @code_mapping: Special mapping structure for vdso data.
  23  *
  24  * This structure contains details of a VDSO image, including the image data
  25  * and offsets of certain symbols required by the kernel. It is generated as
  26  * part of the VDSO build process, aside from the mapping page array, which is
  27  * populated at runtime.
  28  */
  29 struct loongarch_vdso_info {
  30         void *vdso;
  31         unsigned long size;
  32         unsigned long offset_sigreturn;
  33         struct vm_special_mapping code_mapping;
  34         struct vm_special_mapping data_mapping;
  35 };
  36
  37 extern struct loongarch_vdso_info vdso_info;
  38
  39 #endif /* __ASM_VDSO_H */