示例#1
0
static int set_up_temporary_text_mapping(pgd_t *pgd_base)
{
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_base + pgd_index(restore_jump_address);

	pmd = resume_one_md_table_init(pgd);
	if (!pmd)
		return -ENOMEM;

	if (boot_cpu_has(X86_FEATURE_PSE)) {
		set_pmd(pmd + pmd_index(restore_jump_address),
		__pmd((jump_address_phys & PMD_MASK) | pgprot_val(PAGE_KERNEL_LARGE_EXEC)));
	} else {
		pte = resume_one_page_table_init(pmd);
		if (!pte)
			return -ENOMEM;
		set_pte(pte + pte_index(restore_jump_address),
		__pte((jump_address_phys & PAGE_MASK) | pgprot_val(PAGE_KERNEL_EXEC)));
	}

	return 0;
}
/*
 * This maps the physical memory to kernel virtual address space, a total
 * of max_low_pfn pages, by creating page tables starting from address
 * PAGE_OFFSET.  The page tables are allocated out of resume-safe pages.
 */
static int resume_physical_mapping_init(pgd_t *pgd_base)
{
	unsigned long pfn;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	int pgd_idx, pmd_idx;

	pgd_idx = pgd_index(PAGE_OFFSET);
	pgd = pgd_base + pgd_idx;
	pfn = 0;

	for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
		pmd = resume_one_md_table_init(pgd);
		if (!pmd)
			return -ENOMEM;

		if (pfn >= max_low_pfn)
			continue;

		for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD; pmd++, pmd_idx++) {
			if (pfn >= max_low_pfn)
				break;

			/* Map with big pages if possible, otherwise create
			 * normal page tables.
			 * NOTE: We can mark everything as executable here
			 */
			if (cpu_has_pse) {
				set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC));
				pfn += PTRS_PER_PTE;
			} else {
				pte_t *max_pte;

				pte = resume_one_page_table_init(pmd);
				if (!pte)
					return -ENOMEM;

				max_pte = pte + PTRS_PER_PTE;
				for (; pte < max_pte; pte++, pfn++) {
					if (pfn >= max_low_pfn)
						break;

					set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
				}
			}
		}
	}

	resume_map_numa_kva(pgd_base);

	return 0;
}
static int resume_physical_mapping_init(pgd_t *pgd_base)
{
	unsigned long pfn;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	int pgd_idx, pmd_idx;

	pgd_idx = pgd_index(PAGE_OFFSET);
	pgd = pgd_base + pgd_idx;
	pfn = 0;

	for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
		pmd = resume_one_md_table_init(pgd);
		if (!pmd)
			return -ENOMEM;

		if (pfn >= max_low_pfn)
			continue;

		for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD; pmd++, pmd_idx++) {
			if (pfn >= max_low_pfn)
				break;

			if (cpu_has_pse) {
				set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC));
				pfn += PTRS_PER_PTE;
			} else {
				pte_t *max_pte;

				pte = resume_one_page_table_init(pmd);
				if (!pte)
					return -ENOMEM;

				max_pte = pte + PTRS_PER_PTE;
				for (; pte < max_pte; pte++, pfn++) {
					if (pfn >= max_low_pfn)
						break;

					set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
				}
			}
		}
	}

	return 0;
}