1 /* SPDX-License-Identifier: GPL-2.0 */
3 * definitions for external memory segment support
4 * Copyright IBM Corp. 2003
7 #ifndef _ASM_S390X_DCSS_H
8 #define _ASM_S390X_DCSS_H
12 * DCSS segment is defined as a contiguous range of pages using DEFSEG command.
13 * The range start and end is a page number with a value less than or equal to
14 * 0x7ffffff (see CP Commands and Utilities Reference).
16 #define MAX_DCSS_ADDR (512UL * SZ_1G)
18 /* possible values for segment type as returned by segment_info */
26 #define SEG_TYPE_EWEN 7
28 #define SEGMENT_SHARED 0
29 #define SEGMENT_EXCLUSIVE 1
31 int segment_load (char *name, int segtype, unsigned long *addr, unsigned long *length);
32 void segment_unload(char *name);
33 void segment_save(char *name);
34 int segment_type (char* name);
35 int segment_modify_shared (char *name, int do_nonshared);
36 void segment_warning(int rc, char *seg_name);