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/*
* Suspend support specific for s390.
*
* Copyright IBM Corp. 2009
*
* Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
*/
#include <linux/mm.h>
#include <linux/suspend.h>
#include <linux/reboot.h>
#include <linux/pfn.h>
#include <asm/sections.h>
#include <asm/ipl.h>
/*
* References to section boundaries
*/
extern const void __nosave_begin, __nosave_end;
/*
* check if given pfn is in the 'nosave' or in the read only NSS section
*/
int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end))
>> PAGE_SHIFT;
unsigned long eshared_pfn = PFN_DOWN(__pa(&_eshared)) - 1;
unsigned long stext_pfn = PFN_DOWN(__pa(&_stext));
if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn)
return 1;
if (pfn >= stext_pfn && pfn <= eshared_pfn) {
if (ipl_info.type == IPL_TYPE_NSS)
return 1;
} else if ((tprot(pfn * PAGE_SIZE) && pfn > 0))
return 1;
return 0;
}
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