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