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2573a57530
pfn_is_nosave doesn't return the correct value for the second lowcore page if lowcore protection is enabled. Make sure it always returns the correct value. While at it simplify the whole thing. NSS special handling is done by the tprot check like it already works for DCSS as well. So remove the extra code for NSS. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/*
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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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