diff options
| -rw-r--r-- | arch/i386/kernel/setup.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c index dd6b0e3386c..e6023970aa4 100644 --- a/arch/i386/kernel/setup.c +++ b/arch/i386/kernel/setup.c @@ -48,6 +48,7 @@ #include <linux/crash_dump.h> #include <linux/dmi.h> #include <linux/pfn.h> +#include <linux/suspend.h> #include <video/edid.h> @@ -1434,6 +1435,111 @@ static void set_mca_bus(int x) static void set_mca_bus(int x) { } #endif +#ifdef CONFIG_SOFTWARE_SUSPEND +static void __init mark_nosave_page_range(unsigned long start, unsigned long end) +{ + struct page *page; + while (start <= end) { + page = pfn_to_page(start); + SetPageNosave(page); + start++; + } +} + +static void __init e820_nosave_reserved_pages(void) +{ + int i; + unsigned long r_start = 0, r_end = 0; + + /* Assume e820 map is sorted */ + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + unsigned long start, end; + + start = PFN_DOWN(ei->addr); + end = PFN_UP(ei->addr + ei->size); + if (start >= end) + continue; + if (ei->type == E820_RESERVED) + continue; + r_end = start; + /* + * Highmem 'Reserved' pages are marked as reserved, swsusp + * will not save/restore them, so we ignore these pages here. + */ + if (r_end > max_low_pfn) + r_end = max_low_pfn; + if (r_end > r_start) + mark_nosave_page_range(r_start, r_end-1); + if (r_end >= max_low_pfn) + break; + r_start = end; + } +} + +static void __init e820_save_acpi_pages(void) +{ + int i; + + /* Assume e820 map is sorted */ + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + unsigned long start, end; + + start = ei->addr; + end = ei->addr + ei->size; + if (start >= end) + continue; + if (ei->type != E820_ACPI && ei->type != E820_NVS) + continue; + /* + * If the region is below max_low_pfn, it will be + * saved/restored by swsusp follow 'RAM' type. + */ + if (start < (max_low_pfn << PAGE_SHIFT)) + start = max_low_pfn << PAGE_SHIFT; + /* + * Highmem pages (ACPI NVS/Data) are reserved, but swsusp + * highmem save/restore will not save/restore them. We marked + * them as arch saveable pages here + */ + if (end > start) + swsusp_add_arch_pages(start, end); + } +} + +extern char __start_rodata, __end_rodata; +/* + * BIOS reserved region/hole - no save/restore + * ACPI NVS - save/restore + * ACPI Data - this is a little tricky, the mem could be used by OS after OS + * reads tables from the region, but anyway save/restore the memory hasn't any + * side effect and Linux runtime module load/unload might use it. + * kernel rodata - no save/restore (kernel rodata isn't changed) + */ +static int __init mark_nosave_pages(void) +{ + unsigned long pfn_start, pfn_end; + + /* FIXME: provide a version for efi BIOS */ + if (efi_enabled) + return 0; + /* BIOS reserved regions & holes */ + e820_nosave_reserved_pages(); + + /* kernel rodata */ + pfn_start = PFN_UP(virt_to_phys(&__start_rodata)); + pfn_end = PFN_DOWN(virt_to_phys(&__end_rodata)); + mark_nosave_page_range(pfn_start, pfn_end-1); + + /* record ACPI Data/NVS as saveable */ + e820_save_acpi_pages(); + + return 0; +} +core_initcall(mark_nosave_pages); +#endif + /* * Determine if we were loaded by an EFI loader. If so, then we have also been * passed the efi memmap, systab, etc., so we should use these data structures |