arch/loongarch/include/asm/vdso/vdso.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Author: Huacai Chen <chenhuacai@loongson.cn>
   4  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   5  */
   6
   7 #ifndef _ASM_VDSO_VDSO_H
   8 #define _ASM_VDSO_VDSO_H
   9
  10 #ifndef __ASSEMBLY__
  11
  12 #include <asm/asm.h>
  13 #include <asm/page.h>
  14 #include <asm/vdso.h>
  15
  16 struct vdso_pcpu_data {
  17         u32 node;
  18 } ____cacheline_aligned_in_smp;
  19
  20 struct loongarch_vdso_data {
  21         struct vdso_pcpu_data pdata[NR_CPUS];
  22         struct vdso_rng_data rng_data;
  23 };
  24
  25 /*
  26  * The layout of vvar:
  27  *
  28  *                      high
  29  * +---------------------+--------------------------+
  30  * | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE |
  31  * +---------------------+--------------------------+
  32  * |  time-ns vdso data  |        PAGE_SIZE         |
  33  * +---------------------+--------------------------+
  34  * |  generic vdso data  |        PAGE_SIZE         |
  35  * +---------------------+--------------------------+
  36  *                      low
  37  */
  38 #define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
  39 #define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT)
  40
  41 enum vvar_pages {
  42         VVAR_GENERIC_PAGE_OFFSET,
  43         VVAR_TIMENS_PAGE_OFFSET,
  44         VVAR_LOONGARCH_PAGES_START,
  45         VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1,
  46         VVAR_NR_PAGES,
  47 };
  48
  49 #define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
  50
  51 extern struct loongarch_vdso_data _loongarch_data __attribute__((visibility("hidden")));
  52
  53 #endif /* __ASSEMBLY__ */
  54
  55 #endif