Pages (Reserved/ACPI NVS/ACPI Data) below max_low_pfn will be
saved/restored by S4 currently. We should mark 'Reserved' pages
not saveable.
Pages (Reserved/ACPI NVS/ACPI Data) above max_low_pfn will not be
saved/restored by S4 currently. We should save the
'ACPI NVS/ACPI Data' pages.
Signed-off-by: Shaohua Li <[email protected]>
---
linux-2.6.17-rc1-root/arch/i386/kernel/setup.c | 106 +++++++++++++++++++++++++
1 files changed, 106 insertions(+)
diff -puN arch/i386/kernel/setup.c~swsusp_i386_save_pages arch/i386/kernel/setup.c
--- linux-2.6.17-rc1/arch/i386/kernel/setup.c~swsusp_i386_save_pages 2006-04-11 08:04:23.000000000 +0800
+++ linux-2.6.17-rc1-root/arch/i386/kernel/setup.c 2006-04-11 08:08:12.000000000 +0800
@@ -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>
@@ -1400,6 +1401,111 @@ 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 = PFN_DOWN(ei->addr);
+ end = PFN_UP(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)
+ start = max_low_pfn;
+ /*
+ * 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 - 1);
+ }
+}
+
+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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