diff options
Diffstat (limited to 'arch/x86_64/kernel/e820.c')
| -rw-r--r-- | arch/x86_64/kernel/e820.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c index d6d7f731f6f0..708a3cd9a27e 100644 --- a/arch/x86_64/kernel/e820.c +++ b/arch/x86_64/kernel/e820.c @@ -16,6 +16,7 @@ #include <linux/string.h> #include <linux/kexec.h> #include <linux/module.h> +#include <linux/mm.h> #include <asm/pgtable.h> #include <asm/page.h> @@ -297,6 +298,53 @@ void __init e820_reserve_resources(void) } } +/* Mark pages corresponding to given address range as nosave */ +static void __init +e820_mark_nosave_range(unsigned long start, unsigned long end) +{ + unsigned long pfn, max_pfn; + + if (start >= end) + return; + + printk("Nosave address range: %016lx - %016lx\n", start, end); + max_pfn = end >> PAGE_SHIFT; + for (pfn = start >> PAGE_SHIFT; pfn < max_pfn; pfn++) + if (pfn_valid(pfn)) + SetPageNosave(pfn_to_page(pfn)); +} + +/* + * Find the ranges of physical addresses that do not correspond to + * e820 RAM areas and mark the corresponding pages as nosave for software + * suspend and suspend to RAM. + * + * This function requires the e820 map to be sorted and without any + * overlapping entries and assumes the first e820 area to be RAM. + */ +void __init e820_mark_nosave_regions(void) +{ + int i; + unsigned long paddr; + + paddr = round_down(e820.map[0].addr + e820.map[0].size, PAGE_SIZE); + for (i = 1; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + + if (paddr < ei->addr) + e820_mark_nosave_range(paddr, + round_up(ei->addr, PAGE_SIZE)); + + paddr = round_down(ei->addr + ei->size, PAGE_SIZE); + if (ei->type != E820_RAM) + e820_mark_nosave_range(round_up(ei->addr, PAGE_SIZE), + paddr); + + if (paddr >= (end_pfn << PAGE_SHIFT)) + break; + } +} + /* * Add a memory region to the kernel e820 map. */ |