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155af2f95f
This patch introduces the hibernation backend support to the s390 architecture. Now it is possible to suspend a mainframe Linux guest using the following command: echo disk > /sys/power/state Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
41 lines
1002 B
C
41 lines
1002 B
C
/*
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* Suspend support specific for s390.
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*
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* Copyright IBM Corp. 2009
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*
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* Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
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*/
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#include <linux/mm.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <linux/pfn.h>
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#include <asm/sections.h>
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#include <asm/ipl.h>
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/*
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* References to section boundaries
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*/
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extern const void __nosave_begin, __nosave_end;
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/*
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* check if given pfn is in the 'nosave' or in the read only NSS section
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*/
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int pfn_is_nosave(unsigned long pfn)
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{
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unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
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unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end))
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>> PAGE_SHIFT;
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unsigned long eshared_pfn = PFN_DOWN(__pa(&_eshared)) - 1;
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unsigned long stext_pfn = PFN_DOWN(__pa(&_stext));
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if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn)
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return 1;
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if (pfn >= stext_pfn && pfn <= eshared_pfn) {
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if (ipl_info.type == IPL_TYPE_NSS)
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return 1;
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} else if ((tprot(pfn * PAGE_SIZE) && pfn > 0))
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return 1;
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return 0;
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}
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