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/* 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];
};
/*
* The layout of vvar:
*
* high
* +---------------------+--------------------------+
* | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE |
* +---------------------+--------------------------+
* | time-ns vdso data | PAGE_SIZE |
* +---------------------+--------------------------+
* | generic vdso data | PAGE_SIZE |
* +---------------------+--------------------------+
* low
*/
#define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
#define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT)
enum vvar_pages {
VVAR_GENERIC_PAGE_OFFSET,
VVAR_TIMENS_PAGE_OFFSET,
VVAR_LOONGARCH_PAGES_START,
VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1,
VVAR_NR_PAGES,
};
#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
static inline unsigned long get_vdso_base(void)
{
unsigned long addr;
__asm__(
" la.pcrel %0, _start\n"
: "=r" (addr)
:
:);
return addr;
}
static inline unsigned long get_vdso_data(void)
{
return get_vdso_base() - VVAR_SIZE;
}
#endif /* __ASSEMBLY__ */