| /* |
| * 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; |
| } |
