arm64: add support for ioremap() block mappings

[cascardo/linux.git] / arch / arm64 / mm / mmu.c

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index a6f28e5..3e0172e 100644 (file)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -747,3 +747,44 @@ void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
 
        return dt_virt;
 }
+
+int __init arch_ioremap_pud_supported(void)
+{
+       /* only 4k granule supports level 1 block mappings */
+       return IS_ENABLED(CONFIG_ARM64_4K_PAGES);
+}
+
+int __init arch_ioremap_pmd_supported(void)
+{
+       return 1;
+}
+
+int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
+{
+       BUG_ON(phys & ~PUD_MASK);
+       set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
+       return 1;
+}
+
+int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
+{
+       BUG_ON(phys & ~PMD_MASK);
+       set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
+       return 1;
+}
+
+int pud_clear_huge(pud_t *pud)
+{
+       if (!pud_sect(*pud))
+               return 0;
+       pud_clear(pud);
+       return 1;
+}
+
+int pmd_clear_huge(pmd_t *pmd)
+{
+       if (!pmd_sect(*pmd))
+               return 0;
+       pmd_clear(pmd);
+       return 1;
+}