64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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/*
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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/pfn.h>
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#include <asm/system.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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int pfn_is_nosave(unsigned long pfn)
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{
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unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
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unsigned long nosave_end_pfn = PFN_DOWN(__pa(&__nosave_end));
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/* Always save lowcore pages (LC protection might be enabled). */
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if (pfn <= LC_PAGES)
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return 0;
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if (pfn >= nosave_begin_pfn && pfn < nosave_end_pfn)
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return 1;
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/* Skip memory holes and read-only pages (NSS, DCSS, ...). */
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if (tprot(PFN_PHYS(pfn)))
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return 1;
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return 0;
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}
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void save_processor_state(void)
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{
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/* swsusp_arch_suspend() actually saves all cpu register contents.
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* Machine checks must be disabled since swsusp_arch_suspend() stores
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* register contents to their lowcore save areas. That's the same
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* place where register contents on machine checks would be saved.
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* To avoid register corruption disable machine checks.
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* We must also disable machine checks in the new psw mask for
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* program checks, since swsusp_arch_suspend() may generate program
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* checks. Disabling machine checks for all other new psw masks is
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* just paranoia.
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*/
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local_mcck_disable();
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/* Disable lowcore protection */
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__ctl_clear_bit(0,28);
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S390_lowcore.external_new_psw.mask &= ~PSW_MASK_MCHECK;
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S390_lowcore.svc_new_psw.mask &= ~PSW_MASK_MCHECK;
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S390_lowcore.io_new_psw.mask &= ~PSW_MASK_MCHECK;
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S390_lowcore.program_new_psw.mask &= ~PSW_MASK_MCHECK;
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}
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void restore_processor_state(void)
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{
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S390_lowcore.external_new_psw.mask |= PSW_MASK_MCHECK;
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S390_lowcore.svc_new_psw.mask |= PSW_MASK_MCHECK;
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S390_lowcore.io_new_psw.mask |= PSW_MASK_MCHECK;
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S390_lowcore.program_new_psw.mask |= PSW_MASK_MCHECK;
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/* Enable lowcore protection */
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__ctl_set_bit(0,28);
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local_mcck_enable();
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}
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