[PATCH] swsusp: i386 mark special saveable/unsaveable pages (b6370d96) · Commits · 戴 / test

arch/i386/kernel/setup.c

+106 −0

Original line number	Diff line number	Diff line
		@@ -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

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