unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
-static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
-static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused;
-static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused;
-
static DEFINE_SPINLOCK(swapper_pgdir_lock);
static DEFINE_MUTEX(fixmap_lock);
* without allocating new levels of table. Note that this permits the
* creation of new section or page entries.
*/
-static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
- phys_addr_t size, pgprot_t prot)
+void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
+ phys_addr_t size, pgprot_t prot)
{
if ((virt >= PAGE_END) && (virt < VMALLOC_START)) {
pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
&vmlinux_initdata, 0, VM_NO_GUARD);
map_kernel_segment(pgdp, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0);
- if (!READ_ONCE(pgd_val(*pgd_offset_pgd(pgdp, FIXADDR_TOT_START)))) {
- /*
- * The fixmap falls in a separate pgd to the kernel, and doesn't
- * live in the carveout for the swapper_pg_dir. We can simply
- * re-use the existing dir for the fixmap.
- */
- set_pgd(pgd_offset_pgd(pgdp, FIXADDR_TOT_START),
- READ_ONCE(*pgd_offset_k(FIXADDR_TOT_START)));
- } else if (CONFIG_PGTABLE_LEVELS > 3) {
- pgd_t *bm_pgdp;
- p4d_t *bm_p4dp;
- pud_t *bm_pudp;
- /*
- * The fixmap shares its top level pgd entry with the kernel
- * mapping. This can really only occur when we are running
- * with 16k/4 levels, so we can simply reuse the pud level
- * entry instead.
- */
- BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
- bm_pgdp = pgd_offset_pgd(pgdp, FIXADDR_TOT_START);
- bm_p4dp = p4d_offset(bm_pgdp, FIXADDR_TOT_START);
- bm_pudp = pud_set_fixmap_offset(bm_p4dp, FIXADDR_TOT_START);
- pud_populate(&init_mm, bm_pudp, lm_alias(bm_pmd));
- pud_clear_fixmap();
- } else {
- BUG();
- }
-
+ fixmap_copy(pgdp);
kasan_copy_shadow(pgdp);
}
}
#endif /* CONFIG_MEMORY_HOTPLUG */
-static inline pud_t *fixmap_pud(unsigned long addr)
-{
- pgd_t *pgdp = pgd_offset_k(addr);
- p4d_t *p4dp = p4d_offset(pgdp, addr);
- p4d_t p4d = READ_ONCE(*p4dp);
-
- BUG_ON(p4d_none(p4d) || p4d_bad(p4d));
-
- return pud_offset_kimg(p4dp, addr);
-}
-
-static inline pmd_t *fixmap_pmd(unsigned long addr)
-{
- pud_t *pudp = fixmap_pud(addr);
- pud_t pud = READ_ONCE(*pudp);
-
- BUG_ON(pud_none(pud) || pud_bad(pud));
-
- return pmd_offset_kimg(pudp, addr);
-}
-
-static inline pte_t *fixmap_pte(unsigned long addr)
-{
- return &bm_pte[pte_index(addr)];
-}
-
-/*
- * The p*d_populate functions call virt_to_phys implicitly so they can't be used
- * directly on kernel symbols (bm_p*d). This function is called too early to use
- * lm_alias so __p*d_populate functions must be used to populate with the
- * physical address from __pa_symbol.
- */
-void __init early_fixmap_init(void)
-{
- pgd_t *pgdp;
- p4d_t *p4dp, p4d;
- pud_t *pudp;
- pmd_t *pmdp;
- unsigned long addr = FIXADDR_TOT_START;
-
- pgdp = pgd_offset_k(addr);
- p4dp = p4d_offset(pgdp, addr);
- p4d = READ_ONCE(*p4dp);
- if (CONFIG_PGTABLE_LEVELS > 3 &&
- !(p4d_none(p4d) || p4d_page_paddr(p4d) == __pa_symbol(bm_pud))) {
- /*
- * We only end up here if the kernel mapping and the fixmap
- * share the top level pgd entry, which should only happen on
- * 16k/4 levels configurations.
- */
- BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
- pudp = pud_offset_kimg(p4dp, addr);
- } else {
- if (p4d_none(p4d))
- __p4d_populate(p4dp, __pa_symbol(bm_pud), P4D_TYPE_TABLE);
- pudp = fixmap_pud(addr);
- }
- if (pud_none(READ_ONCE(*pudp)))
- __pud_populate(pudp, __pa_symbol(bm_pmd), PUD_TYPE_TABLE);
- pmdp = fixmap_pmd(addr);
- __pmd_populate(pmdp, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
-
- /*
- * The boot-ioremap range spans multiple pmds, for which
- * we are not prepared:
- */
- BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
- != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
-
- if ((pmdp != fixmap_pmd(__fix_to_virt(FIX_BTMAP_BEGIN)))
- || pmdp != fixmap_pmd(__fix_to_virt(FIX_BTMAP_END))) {
- WARN_ON(1);
- pr_warn("pmdp %p != %p, %p\n",
- pmdp, fixmap_pmd(__fix_to_virt(FIX_BTMAP_BEGIN)),
- fixmap_pmd(__fix_to_virt(FIX_BTMAP_END)));
- pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
- __fix_to_virt(FIX_BTMAP_BEGIN));
- pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
- __fix_to_virt(FIX_BTMAP_END));
-
- pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
- pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
- }
-}
-
-/*
- * Unusually, this is also called in IRQ context (ghes_iounmap_irq) so if we
- * ever need to use IPIs for TLB broadcasting, then we're in trouble here.
- */
-void __set_fixmap(enum fixed_addresses idx,
- phys_addr_t phys, pgprot_t flags)
-{
- unsigned long addr = __fix_to_virt(idx);
- pte_t *ptep;
-
- BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
-
- ptep = fixmap_pte(addr);
-
- if (pgprot_val(flags)) {
- set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags));
- } else {
- pte_clear(&init_mm, addr, ptep);
- flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
- }
-}
-
-void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
-{
- const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
- int offset;
- void *dt_virt;
-
- /*
- * Check whether the physical FDT address is set and meets the minimum
- * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
- * at least 8 bytes so that we can always access the magic and size
- * fields of the FDT header after mapping the first chunk, double check
- * here if that is indeed the case.
- */
- BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
- if (!dt_phys || dt_phys % MIN_FDT_ALIGN)
- return NULL;
-
- /*
- * Make sure that the FDT region can be mapped without the need to
- * allocate additional translation table pages, so that it is safe
- * to call create_mapping_noalloc() this early.
- *
- * On 64k pages, the FDT will be mapped using PTEs, so we need to
- * be in the same PMD as the rest of the fixmap.
- * On 4k pages, we'll use section mappings for the FDT so we only
- * have to be in the same PUD.
- */
- BUILD_BUG_ON(dt_virt_base % SZ_2M);
-
- BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT !=
- __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT);
-
- offset = dt_phys % SWAPPER_BLOCK_SIZE;
- dt_virt = (void *)dt_virt_base + offset;
-
- /* map the first chunk so we can read the size from the header */
- create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
- dt_virt_base, SWAPPER_BLOCK_SIZE, prot);
-
- if (fdt_magic(dt_virt) != FDT_MAGIC)
- return NULL;
-
- *size = fdt_totalsize(dt_virt);
- if (*size > MAX_FDT_SIZE)
- return NULL;
-
- if (offset + *size > SWAPPER_BLOCK_SIZE)
- create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base,
- round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot);
-
- return dt_virt;
-}
-
int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)
{
pud_t new_pud = pfn_pud(__phys_to_pfn(phys), mk_pud_sect_prot(prot));