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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __S390_VDSO_H__
#define __S390_VDSO_H__
#include <vdso/datapage.h>
/* Default link addresses for the vDSOs */
#define VDSO32_LBASE 0
#define VDSO64_LBASE 0
#define VDSO_VERSION_STRING LINUX_2.6.29
#ifndef __ASSEMBLY__
/*
* Note about the vdso_data and vdso_per_cpu_data structures:
*
* NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
* structure is supposed to be known only to the function in the vdso
* itself and may change without notice.
*/
struct vdso_per_cpu_data {
/*
* Note: node_id and cpu_nr must be at adjacent memory locations.
* VDSO userspace must read both values with a single instruction.
*/
union {
__u64 getcpu_val;
struct {
__u32 node_id;
__u32 cpu_nr;
};
};
};
extern struct vdso_data *vdso_data;
int vdso_alloc_per_cpu(struct lowcore *lowcore);
void vdso_free_per_cpu(struct lowcore *lowcore);
#endif /* __ASSEMBLY__ */
#endif /* __S390_VDSO_H__ */
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