diff options
Diffstat (limited to 'arch/s390/power/suspend.c')
| -rw-r--r-- | arch/s390/power/suspend.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/s390/power/suspend.c b/arch/s390/power/suspend.c new file mode 100644 index 00000000000..b3351eceebb --- /dev/null +++ b/arch/s390/power/suspend.c @@ -0,0 +1,40 @@ +/* + * 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; +} |