x86, hibernate: Extract the common code of 64/32 bit system

Reduce the hibernation code duplication between x86-32 and x86-64
by extracting the common code into hibernate.c.

Currently only pfn_is_nosave() is the activated common
function in hibernate.c

No functional change.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Zhimin Gu <kookoo.gu@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 221 deletions

diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c
index e0de959ad02d..8bc2eb0dc464 100644
--- a/arch/x86/power/hibernate_64.c
+++ b/arch/x86/power/hibernate_64.c
@@ -26,26 +26,6 @@
 #include <asm/suspend.h>
 #include <asm/tlbflush.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;
-unsigned long jump_address_phys;
-
-/*
- * Value of the cr3 register from before the hibernation (this value is passed
- * in the image header).
- */
-unsigned long restore_cr3 __visible;
-
-unsigned long temp_level4_pgt __visible;
-
-unsigned long relocated_restore_code __visible;
-
 static int set_up_temporary_text_mapping(pgd_t *pgd)
 {
 	pmd_t *pmd;
@@ -145,45 +125,6 @@ static int set_up_temporary_mappings(void)
 	return 0;
 }
 
-static int relocate_restore_code(void)
-{
-	pgd_t *pgd;
-	p4d_t *p4d;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-
-	relocated_restore_code = get_safe_page(GFP_ATOMIC);
-	if (!relocated_restore_code)
-		return -ENOMEM;
-
-	memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE);
-
-	/* Make the page containing the relocated code executable */
-	pgd = (pgd_t *)__va(read_cr3_pa()) +
-		pgd_index(relocated_restore_code);
-	p4d = p4d_offset(pgd, relocated_restore_code);
-	if (p4d_large(*p4d)) {
-		set_p4d(p4d, __p4d(p4d_val(*p4d) & ~_PAGE_NX));
-		goto out;
-	}
-	pud = pud_offset(p4d, relocated_restore_code);
-	if (pud_large(*pud)) {
-		set_pud(pud, __pud(pud_val(*pud) & ~_PAGE_NX));
-		goto out;
-	}
-	pmd = pmd_offset(pud, relocated_restore_code);
-	if (pmd_large(*pmd)) {
-		set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_NX));
-		goto out;
-	}
-	pte = pte_offset_kernel(pmd, relocated_restore_code);
-	set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_NX));
-out:
-	__flush_tlb_all();
-	return 0;
-}
-
 asmlinkage int swsusp_arch_resume(void)
 {
 	int error;
@@ -200,165 +141,3 @@ asmlinkage int swsusp_arch_resume(void)
 	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);
-}
-
-#define MD5_DIGEST_SIZE 16
-
-struct restore_data_record {
-	unsigned long jump_address;
-	unsigned long jump_address_phys;
-	unsigned long cr3;
-	unsigned long magic;
-	u8 e820_digest[MD5_DIGEST_SIZE];
-};
-
-#define RESTORE_MAGIC	0x23456789ABCDEF01UL
-
-#if IS_BUILTIN(CONFIG_CRYPTO_MD5)
-/**
- * get_e820_md5 - calculate md5 according to given e820 table
- *
- * @table: the e820 table to be calculated
- * @buf: the md5 result to be stored to
- */
-static int get_e820_md5(struct e820_table *table, void *buf)
-{
-	struct crypto_shash *tfm;
-	struct shash_desc *desc;
-	int size;
-	int ret = 0;
-
-	tfm = crypto_alloc_shash("md5", 0, 0);
-	if (IS_ERR(tfm))
-		return -ENOMEM;
-
-	desc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(tfm),
-		       GFP_KERNEL);
-	if (!desc) {
-		ret = -ENOMEM;
-		goto free_tfm;
-	}
-
-	desc->tfm = tfm;
-	desc->flags = 0;
-
-	size = offsetof(struct e820_table, entries) +
-		sizeof(struct e820_entry) * table->nr_entries;
-
-	if (crypto_shash_digest(desc, (u8 *)table, size, buf))
-		ret = -EINVAL;
-
-	kzfree(desc);
-
-free_tfm:
-	crypto_free_shash(tfm);
-	return ret;
-}
-
-static int hibernation_e820_save(void *buf)
-{
-	return get_e820_md5(e820_table_firmware, buf);
-}
-
-static bool hibernation_e820_mismatch(void *buf)
-{
-	int ret;
-	u8 result[MD5_DIGEST_SIZE];
-
-	memset(result, 0, MD5_DIGEST_SIZE);
-	/* If there is no digest in suspend kernel, let it go. */
-	if (!memcmp(result, buf, MD5_DIGEST_SIZE))
-		return false;
-
-	ret = get_e820_md5(e820_table_firmware, result);
-	if (ret)
-		return true;
-
-	return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
-}
-#else
-static int hibernation_e820_save(void *buf)
-{
-	return 0;
-}
-
-static bool hibernation_e820_mismatch(void *buf)
-{
-	/* If md5 is not builtin for restore kernel, let it go. */
-	return false;
-}
-#endif
-
-/**
- *	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 = (unsigned long)restore_registers;
-	rdr->jump_address_phys = __pa_symbol(restore_registers);
-
-	/*
-	 * The restore code fixes up CR3 and CR4 in the following sequence:
-	 *
-	 * [in hibernation asm]
-	 * 1. CR3 <= temporary page tables
-	 * 2. CR4 <= mmu_cr4_features (from the kernel that restores us)
-	 * 3. CR3 <= rdr->cr3
-	 * 4. CR4 <= mmu_cr4_features (from us, i.e. the image kernel)
-	 * [in restore_processor_state()]
-	 * 5. CR4 <= saved CR4
-	 * 6. CR3 <= saved CR3
-	 *
-	 * Our mmu_cr4_features has CR4.PCIDE=0, and toggling
-	 * CR4.PCIDE while CR3's PCID bits are nonzero is illegal, so
-	 * rdr->cr3 needs to point to valid page tables but must not
-	 * have any of the PCID bits set.
-	 */
-	rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK;
-
-	rdr->magic = RESTORE_MAGIC;
-
-	return hibernation_e820_save(rdr->e820_digest);
-}
-
-/**
- *	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;
-	jump_address_phys = rdr->jump_address_phys;
-	restore_cr3 = rdr->cr3;
-
-	if (rdr->magic != RESTORE_MAGIC) {
-		pr_crit("Unrecognized hibernate image header format!\n");
-		return -EINVAL;
-	}
-
-	if (hibernation_e820_mismatch(rdr->e820_digest)) {
-		pr_crit("Hibernate inconsistent memory map detected!\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}