Hans-Joachim Picht | 155af2f | 2009-06-16 10:30:52 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Suspend support specific for s390. |
| 3 | * |
| 4 | * Copyright IBM Corp. 2009 |
| 5 | * |
| 6 | * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/mm.h> |
| 10 | #include <linux/suspend.h> |
| 11 | #include <linux/reboot.h> |
| 12 | #include <linux/pfn.h> |
| 13 | #include <asm/sections.h> |
| 14 | #include <asm/ipl.h> |
| 15 | |
| 16 | /* |
| 17 | * References to section boundaries |
| 18 | */ |
| 19 | extern const void __nosave_begin, __nosave_end; |
| 20 | |
| 21 | /* |
| 22 | * check if given pfn is in the 'nosave' or in the read only NSS section |
| 23 | */ |
| 24 | int pfn_is_nosave(unsigned long pfn) |
| 25 | { |
| 26 | unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; |
| 27 | unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) |
| 28 | >> PAGE_SHIFT; |
| 29 | unsigned long eshared_pfn = PFN_DOWN(__pa(&_eshared)) - 1; |
| 30 | unsigned long stext_pfn = PFN_DOWN(__pa(&_stext)); |
| 31 | |
| 32 | if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn) |
| 33 | return 1; |
| 34 | if (pfn >= stext_pfn && pfn <= eshared_pfn) { |
| 35 | if (ipl_info.type == IPL_TYPE_NSS) |
| 36 | return 1; |
| 37 | } else if ((tprot(pfn * PAGE_SIZE) && pfn > 0)) |
| 38 | return 1; |
| 39 | return 0; |
| 40 | } |