162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci#ifndef __ASM_CSKY_VDSO_H 462306a36Sopenharmony_ci#define __ASM_CSKY_VDSO_H 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#include <linux/types.h> 762306a36Sopenharmony_ci 862306a36Sopenharmony_ci#ifndef GENERIC_TIME_VSYSCALL 962306a36Sopenharmony_cistruct vdso_data { 1062306a36Sopenharmony_ci}; 1162306a36Sopenharmony_ci#endif 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci/* 1462306a36Sopenharmony_ci * The VDSO symbols are mapped into Linux so we can just use regular symbol 1562306a36Sopenharmony_ci * addressing to get their offsets in userspace. The symbols are mapped at an 1662306a36Sopenharmony_ci * offset of 0, but since the linker must support setting weak undefined 1762306a36Sopenharmony_ci * symbols to the absolute address 0 it also happens to support other low 1862306a36Sopenharmony_ci * addresses even when the code model suggests those low addresses would not 1962306a36Sopenharmony_ci * otherwise be available. 2062306a36Sopenharmony_ci */ 2162306a36Sopenharmony_ci#define VDSO_SYMBOL(base, name) \ 2262306a36Sopenharmony_ci({ \ 2362306a36Sopenharmony_ci extern const char __vdso_##name[]; \ 2462306a36Sopenharmony_ci (void __user *)((unsigned long)(base) + __vdso_##name); \ 2562306a36Sopenharmony_ci}) 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci#endif /* __ASM_CSKY_VDSO_H */ 28