Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +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 | |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 9 | #include <linux/pfn.h> |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 10 | #include <asm/system.h> |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 11 | |
| 12 | /* |
| 13 | * References to section boundaries |
| 14 | */ |
| 15 | extern const void __nosave_begin, __nosave_end; |
| 16 | |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 17 | int pfn_is_nosave(unsigned long pfn) |
| 18 | { |
Heiko Carstens | 2573a57 | 2009-09-22 22:58:50 +0200 | [diff] [blame] | 19 | unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin)); |
| 20 | unsigned long nosave_end_pfn = PFN_DOWN(__pa(&__nosave_end)); |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 21 | |
Heiko Carstens | 2573a57 | 2009-09-22 22:58:50 +0200 | [diff] [blame] | 22 | /* Always save lowcore pages (LC protection might be enabled). */ |
| 23 | if (pfn <= LC_PAGES) |
| 24 | return 0; |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 25 | if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn) |
| 26 | return 1; |
Heiko Carstens | 2573a57 | 2009-09-22 22:58:50 +0200 | [diff] [blame] | 27 | /* Skip memory holes and read-only pages (NSS, DCSS, ...). */ |
| 28 | if (tprot(PFN_PHYS(pfn))) |
Heiko Carstens | c48ff64 | 2009-09-11 10:28:37 +0200 | [diff] [blame] | 29 | return 1; |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | void save_processor_state(void) |
| 34 | { |
| 35 | /* swsusp_arch_suspend() actually saves all cpu register contents. |
| 36 | * Machine checks must be disabled since swsusp_arch_suspend() stores |
| 37 | * register contents to their lowcore save areas. That's the same |
| 38 | * place where register contents on machine checks would be saved. |
| 39 | * To avoid register corruption disable machine checks. |
| 40 | * We must also disable machine checks in the new psw mask for |
| 41 | * program checks, since swsusp_arch_suspend() may generate program |
| 42 | * checks. Disabling machine checks for all other new psw masks is |
| 43 | * just paranoia. |
| 44 | */ |
| 45 | local_mcck_disable(); |
| 46 | /* Disable lowcore protection */ |
| 47 | __ctl_clear_bit(0,28); |
| 48 | S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK; |
| 49 | S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK; |
| 50 | S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK; |
| 51 | S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK; |
| 52 | } |
| 53 | |
| 54 | void restore_processor_state(void) |
| 55 | { |
| 56 | S390_lowcore.external_new_psw.mask |= PSW_MASK_MCHECK; |
| 57 | S390_lowcore.svc_new_psw.mask |= PSW_MASK_MCHECK; |
| 58 | S390_lowcore.io_new_psw.mask |= PSW_MASK_MCHECK; |
| 59 | S390_lowcore.program_new_psw.mask |= PSW_MASK_MCHECK; |
| 60 | /* Enable lowcore protection */ |
| 61 | __ctl_set_bit(0,28); |
| 62 | local_mcck_enable(); |
| 63 | } |