66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef __ASSEMBLY__
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#include <asm/asm.h>
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#include <asm/page.h>
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#include <asm/vdso.h>
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struct vdso_pcpu_data {
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u32 node;
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} ____cacheline_aligned_in_smp;
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struct loongarch_vdso_data {
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struct vdso_pcpu_data pdata[NR_CPUS];
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};
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/*
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* The layout of vvar:
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*
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* high
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* +---------------------+--------------------------+
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* | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE |
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* +---------------------+--------------------------+
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* | time-ns vdso data | PAGE_SIZE |
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* +---------------------+--------------------------+
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* | generic vdso data | PAGE_SIZE |
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* +---------------------+--------------------------+
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* low
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*/
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#define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
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#define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT)
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enum vvar_pages {
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VVAR_GENERIC_PAGE_OFFSET,
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VVAR_TIMENS_PAGE_OFFSET,
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VVAR_LOONGARCH_PAGES_START,
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VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1,
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VVAR_NR_PAGES,
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};
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#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
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static inline unsigned long get_vdso_base(void)
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{
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unsigned long addr;
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__asm__(
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" la.pcrel %0, _start\n"
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: "=r" (addr)
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:
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:);
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return addr;
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}
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static inline unsigned long get_vdso_data(void)
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{
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return get_vdso_base() - VVAR_SIZE;
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}
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#endif /* __ASSEMBLY__ */
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