b2b15f079c
The maximum mappable physical address (as returned by arch_get_mappable_range() callback) is limited by the value of (1UL << MAX_PHYSMEM_BITS). The maximum physical address available to a DCSS segment is 512GB. In case the available online or offline memory size is less than the DCSS limit arch_get_mappable_range() would include never used [512GB..(1UL << MAX_PHYSMEM_BITS)] range. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
39 lines
1 KiB
C
39 lines
1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* definitions for external memory segment support
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* Copyright IBM Corp. 2003
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*/
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#ifndef _ASM_S390X_DCSS_H
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#define _ASM_S390X_DCSS_H
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#ifndef __ASSEMBLY__
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/*
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* DCSS segment is defined as a contiguous range of pages using DEFSEG command.
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* The range start and end is a page number with a value less than or equal to
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* 0x7ffffff (see CP Commands and Utilities Reference).
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*/
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#define MAX_DCSS_ADDR (512UL * SZ_1G)
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/* possible values for segment type as returned by segment_info */
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#define SEG_TYPE_SW 0
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#define SEG_TYPE_EW 1
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#define SEG_TYPE_SR 2
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#define SEG_TYPE_ER 3
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#define SEG_TYPE_SN 4
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#define SEG_TYPE_EN 5
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#define SEG_TYPE_SC 6
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#define SEG_TYPE_EWEN 7
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#define SEGMENT_SHARED 0
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#define SEGMENT_EXCLUSIVE 1
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int segment_load (char *name, int segtype, unsigned long *addr, unsigned long *length);
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void segment_unload(char *name);
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void segment_save(char *name);
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int segment_type (char* name);
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int segment_modify_shared (char *name, int do_nonshared);
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void segment_warning(int rc, char *seg_name);
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#endif
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#endif
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