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@@ -0,0 +1,246 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Hibernation support for x86
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+ *
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+ * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
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+ * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
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+ * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
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+ */
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+#include <linux/gfp.h>
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+#include <linux/smp.h>
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+#include <linux/suspend.h>
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+#include <linux/scatterlist.h>
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+#include <linux/kdebug.h>
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+
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+#include <crypto/hash.h>
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+
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+#include <asm/e820/api.h>
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+#include <asm/init.h>
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+#include <asm/proto.h>
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+#include <asm/page.h>
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+#include <asm/pgtable.h>
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+#include <asm/mtrr.h>
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+#include <asm/sections.h>
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+#include <asm/suspend.h>
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+#include <asm/tlbflush.h>
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+
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+/*
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+ * Address to jump to in the last phase of restore in order to get to the image
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+ * kernel's text (this value is passed in the image header).
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+ */
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+unsigned long restore_jump_address __visible;
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+unsigned long jump_address_phys;
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+
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+/*
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+ * Value of the cr3 register from before the hibernation (this value is passed
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+ * in the image header).
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+ */
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+unsigned long restore_cr3 __visible;
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+unsigned long temp_level4_pgt __visible;
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+unsigned long relocated_restore_code __visible;
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+
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+/**
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+ * pfn_is_nosave - check if given pfn is in the 'nosave' section
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+ */
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+int pfn_is_nosave(unsigned long pfn)
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+{
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+ unsigned long nosave_begin_pfn;
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+ unsigned long nosave_end_pfn;
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+
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+ nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
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+ nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
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+
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+ return pfn >= nosave_begin_pfn && pfn < nosave_end_pfn;
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+}
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+
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+#ifdef CONFIG_X86_64
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+
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+#define MD5_DIGEST_SIZE 16
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+
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+struct restore_data_record {
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+ unsigned long jump_address;
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+ unsigned long jump_address_phys;
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+ unsigned long cr3;
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+ unsigned long magic;
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+ u8 e820_digest[MD5_DIGEST_SIZE];
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+};
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+
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+#if IS_BUILTIN(CONFIG_CRYPTO_MD5)
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+/**
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+ * get_e820_md5 - calculate md5 according to given e820 table
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+ *
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+ * @table: the e820 table to be calculated
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+ * @buf: the md5 result to be stored to
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+ */
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+static int get_e820_md5(struct e820_table *table, void *buf)
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+{
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+ struct crypto_shash *tfm;
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+ struct shash_desc *desc;
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+ int size;
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+ int ret = 0;
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+
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+ tfm = crypto_alloc_shash("md5", 0, 0);
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+ if (IS_ERR(tfm))
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+ return -ENOMEM;
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+
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+ desc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(tfm),
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+ GFP_KERNEL);
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+ if (!desc) {
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+ ret = -ENOMEM;
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+ goto free_tfm;
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+ }
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+
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+ desc->tfm = tfm;
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+ desc->flags = 0;
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+
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+ size = offsetof(struct e820_table, entries) +
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+ sizeof(struct e820_entry) * table->nr_entries;
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+
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+ if (crypto_shash_digest(desc, (u8 *)table, size, buf))
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+ ret = -EINVAL;
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+
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+ kzfree(desc);
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+
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+free_tfm:
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+ crypto_free_shash(tfm);
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+ return ret;
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+}
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+
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+static int hibernation_e820_save(void *buf)
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+{
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+ return get_e820_md5(e820_table_firmware, buf);
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+}
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+
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+static bool hibernation_e820_mismatch(void *buf)
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+{
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+ int ret;
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+ u8 result[MD5_DIGEST_SIZE];
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+
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+ memset(result, 0, MD5_DIGEST_SIZE);
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+ /* If there is no digest in suspend kernel, let it go. */
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+ if (!memcmp(result, buf, MD5_DIGEST_SIZE))
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+ return false;
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+
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+ ret = get_e820_md5(e820_table_firmware, result);
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+ if (ret)
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+ return true;
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+
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+ return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
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+}
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+#else
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+static int hibernation_e820_save(void *buf)
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+{
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+ return 0;
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+}
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+
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+static bool hibernation_e820_mismatch(void *buf)
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+{
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+ /* If md5 is not builtin for restore kernel, let it go. */
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+ return false;
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+}
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+#endif
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+
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+#define RESTORE_MAGIC 0x23456789ABCDEF01UL
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+
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+/**
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+ * arch_hibernation_header_save - populate the architecture specific part
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+ * of a hibernation image header
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+ * @addr: address to save the data at
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+ */
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+int arch_hibernation_header_save(void *addr, unsigned int max_size)
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+{
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+ struct restore_data_record *rdr = addr;
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+
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+ if (max_size < sizeof(struct restore_data_record))
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+ return -EOVERFLOW;
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+ rdr->magic = RESTORE_MAGIC;
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+ rdr->jump_address = (unsigned long)restore_registers;
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+ rdr->jump_address_phys = __pa_symbol(restore_registers);
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+
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+ /*
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+ * The restore code fixes up CR3 and CR4 in the following sequence:
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+ *
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+ * [in hibernation asm]
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+ * 1. CR3 <= temporary page tables
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+ * 2. CR4 <= mmu_cr4_features (from the kernel that restores us)
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+ * 3. CR3 <= rdr->cr3
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+ * 4. CR4 <= mmu_cr4_features (from us, i.e. the image kernel)
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+ * [in restore_processor_state()]
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+ * 5. CR4 <= saved CR4
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+ * 6. CR3 <= saved CR3
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+ *
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+ * Our mmu_cr4_features has CR4.PCIDE=0, and toggling
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+ * CR4.PCIDE while CR3's PCID bits are nonzero is illegal, so
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+ * rdr->cr3 needs to point to valid page tables but must not
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+ * have any of the PCID bits set.
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+ */
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+ rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK;
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+
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+ return hibernation_e820_save(rdr->e820_digest);
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+}
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+
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+/**
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+ * arch_hibernation_header_restore - read the architecture specific data
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+ * from the hibernation image header
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+ * @addr: address to read the data from
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+ */
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+int arch_hibernation_header_restore(void *addr)
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+{
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+ struct restore_data_record *rdr = addr;
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+
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+ if (rdr->magic != RESTORE_MAGIC) {
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+ pr_crit("Unrecognized hibernate image header format!\n");
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+ return -EINVAL;
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+ }
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+
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+ restore_jump_address = rdr->jump_address;
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+ jump_address_phys = rdr->jump_address_phys;
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+ restore_cr3 = rdr->cr3;
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+
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+ if (hibernation_e820_mismatch(rdr->e820_digest)) {
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+ pr_crit("Hibernate inconsistent memory map detected!\n");
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+ return -ENODEV;
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+ }
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+
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+ return 0;
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+}
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+
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+int relocate_restore_code(void)
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+{
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+ pgd_t *pgd;
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+ p4d_t *p4d;
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+ pud_t *pud;
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+ pmd_t *pmd;
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+ pte_t *pte;
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+
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+ relocated_restore_code = get_safe_page(GFP_ATOMIC);
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+ if (!relocated_restore_code)
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+ return -ENOMEM;
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+
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+ memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE);
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+
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+ /* Make the page containing the relocated code executable */
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+ pgd = (pgd_t *)__va(read_cr3_pa()) +
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+ pgd_index(relocated_restore_code);
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+ p4d = p4d_offset(pgd, relocated_restore_code);
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+ if (p4d_large(*p4d)) {
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+ set_p4d(p4d, __p4d(p4d_val(*p4d) & ~_PAGE_NX));
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+ goto out;
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+ }
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+ pud = pud_offset(p4d, relocated_restore_code);
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+ if (pud_large(*pud)) {
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+ set_pud(pud, __pud(pud_val(*pud) & ~_PAGE_NX));
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+ goto out;
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+ }
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+ pmd = pmd_offset(pud, relocated_restore_code);
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+ if (pmd_large(*pmd)) {
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+ set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_NX));
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+ goto out;
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+ }
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+ pte = pte_offset_kernel(pmd, relocated_restore_code);
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+ set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_NX));
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+out:
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+ __flush_tlb_all();
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+ return 0;
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+}
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+#endif
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Zhimin Gu