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;
}