Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / power / hibernate_64.c

diff --git a/kernel/arch/x86/power/hibernate_64.c b/kernel/arch/x86/power/hibernate_64.c
new file mode 100644 (file)
index 0000000..009947d
--- /dev/null
+++ b/kernel/arch/x86/power/hibernate_64.c
@@ -0,0 +1,147 @@
+/*
+ * Hibernation support for x86-64
+ *
+ * Distribute under GPLv2
+ *
+ * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
+ * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
+ * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
+ */
+
+#include <linux/gfp.h>
+#include <linux/smp.h>
+#include <linux/suspend.h>
+
+#include <asm/init.h>
+#include <asm/proto.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/mtrr.h>
+#include <asm/sections.h>
+#include <asm/suspend.h>
+
+/* Defined in hibernate_asm_64.S */
+extern asmlinkage __visible int restore_image(void);
+
+/*
+ * Address to jump to in the last phase of restore in order to get to the image
+ * kernel's text (this value is passed in the image header).
+ */
+unsigned long restore_jump_address __visible;
+
+/*
+ * Value of the cr3 register from before the hibernation (this value is passed
+ * in the image header).
+ */
+unsigned long restore_cr3 __visible;
+
+pgd_t *temp_level4_pgt __visible;
+
+void *relocated_restore_code __visible;
+
+static void *alloc_pgt_page(void *context)
+{
+       return (void *)get_safe_page(GFP_ATOMIC);
+}
+
+static int set_up_temporary_mappings(void)
+{
+       struct x86_mapping_info info = {
+               .alloc_pgt_page = alloc_pgt_page,
+               .pmd_flag       = __PAGE_KERNEL_LARGE_EXEC,
+               .kernel_mapping = true,
+       };
+       unsigned long mstart, mend;
+       int result;
+       int i;
+
+       temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
+       if (!temp_level4_pgt)
+               return -ENOMEM;
+
+       /* It is safe to reuse the original kernel mapping */
+       set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+               init_level4_pgt[pgd_index(__START_KERNEL_map)]);
+
+       /* Set up the direct mapping from scratch */
+       for (i = 0; i < nr_pfn_mapped; i++) {
+               mstart = pfn_mapped[i].start << PAGE_SHIFT;
+               mend   = pfn_mapped[i].end << PAGE_SHIFT;
+
+               result = kernel_ident_mapping_init(&info, temp_level4_pgt,
+                                                  mstart, mend);
+
+               if (result)
+                       return result;
+       }
+
+       return 0;
+}
+
+int swsusp_arch_resume(void)
+{
+       int error;
+
+       /* We have got enough memory and from now on we cannot recover */
+       if ((error = set_up_temporary_mappings()))
+               return error;
+
+       relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
+       if (!relocated_restore_code)
+               return -ENOMEM;
+       memcpy(relocated_restore_code, &core_restore_code,
+              &restore_registers - &core_restore_code);
+
+       restore_image();
+       return 0;
+}
+
+/*
+ *     pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
+
+int pfn_is_nosave(unsigned long pfn)
+{
+       unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
+       unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
+       return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
+
+struct restore_data_record {
+       unsigned long jump_address;
+       unsigned long cr3;
+       unsigned long magic;
+};
+
+#define RESTORE_MAGIC  0x0123456789ABCDEFUL
+
+/**
+ *     arch_hibernation_header_save - populate the architecture specific part
+ *             of a hibernation image header
+ *     @addr: address to save the data at
+ */
+int arch_hibernation_header_save(void *addr, unsigned int max_size)
+{
+       struct restore_data_record *rdr = addr;
+
+       if (max_size < sizeof(struct restore_data_record))
+               return -EOVERFLOW;
+       rdr->jump_address = restore_jump_address;
+       rdr->cr3 = restore_cr3;
+       rdr->magic = RESTORE_MAGIC;
+       return 0;
+}
+
+/**
+ *     arch_hibernation_header_restore - read the architecture specific data
+ *             from the hibernation image header
+ *     @addr: address to read the data from
+ */
+int arch_hibernation_header_restore(void *addr)
+{
+       struct restore_data_record *rdr = addr;
+
+       restore_jump_address = rdr->jump_address;
+       restore_cr3 = rdr->cr3;
+       return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
+}