/*
* descriptor tables
*/
- asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
- asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
- asm volatile ("str %0" : "=m" (ctxt->tr));
+ store_gdt((struct desc_ptr *)&ctxt->gdt_limit);
+ store_idt((struct desc_ptr *)&ctxt->idt_limit);
+ store_tr(ctxt->tr);
/* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
/*
* now restore the descriptor tables to their proper values
* ltr is done i fix_processor_context().
*/
- asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
- asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
+ load_gdt((const struct desc_ptr *)&ctxt->gdt_limit);
+ load_idt((const struct desc_ptr *)&ctxt->idt_limit);
+
/*
* segment registers
int cpu = smp_processor_id();
struct tss_struct *t = &per_cpu(init_tss, cpu);
- set_tss_desc(cpu,t); /* This just modifies memory; should not be neccessary. But... This is neccessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
+ set_tss_desc(cpu,t); /* This just modifies memory; should not be necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
cpu_gdt(cpu)[GDT_ENTRY_TSS].type = 9;
/* Defined in arch/x86_64/kernel/suspend_asm.S */
extern 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;
+
+/*
+ * Value of the cr3 register from before the hibernation (this value is passed
+ * in the image header).
+ */
+unsigned long restore_cr3;
+
pgd_t *temp_level4_pgt;
+void *relocated_restore_code;
+
static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
{
long i, j;
if (paddr >= end)
break;
- pe = _PAGE_NX | _PAGE_PSE | _KERNPG_TABLE | paddr;
+ pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
pe &= __supported_pte_mask;
set_pmd(pmd, __pmd(pe));
}
return 0;
}
+static int res_kernel_text_pud_init(pud_t *pud, unsigned long start)
+{
+ pmd_t *pmd;
+ unsigned long paddr;
+
+ pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
+ if (!pmd)
+ return -ENOMEM;
+ set_pud(pud + pud_index(start), __pud(__pa(pmd) | _KERNPG_TABLE));
+ for (paddr = 0; paddr < KERNEL_TEXT_SIZE; pmd++, paddr += PMD_SIZE) {
+ unsigned long pe;
+
+ pe = __PAGE_KERNEL_LARGE_EXEC | _PAGE_GLOBAL | paddr;
+ pe &= __supported_pte_mask;
+ set_pmd(pmd, __pmd(pe));
+ }
+
+ return 0;
+}
+
static int set_up_temporary_mappings(void)
{
unsigned long start, end, next;
+ pud_t *pud;
int error;
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 */
start = (unsigned long)pfn_to_kaddr(0);
end = (unsigned long)pfn_to_kaddr(end_pfn);
for (; start < end; start = next) {
- pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
+ pud = (pud_t *)get_safe_page(GFP_ATOMIC);
if (!pud)
return -ENOMEM;
next = start + PGDIR_SIZE;
set_pgd(temp_level4_pgt + pgd_index(start),
mk_kernel_pgd(__pa(pud)));
}
- return 0;
+
+ /* Set up the kernel text mapping from scratch */
+ pud = (pud_t *)get_safe_page(GFP_ATOMIC);
+ if (!pud)
+ return -ENOMEM;
+ error = res_kernel_text_pud_init(pud, __START_KERNEL_map);
+ if (!error)
+ set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+ __pgd(__pa(pud) | _PAGE_TABLE));
+
+ return error;
}
int swsusp_arch_resume(void)
/* 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;
}
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;
+}
#endif /* CONFIG_HIBERNATION */
git.samba.org / sfrench / cifs-2.6.git / blobdiff