diff options
Diffstat (limited to 'arch/arm64/mm/mmu.c')
| -rw-r--r-- | arch/arm64/mm/mmu.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index a8d1059b91b..f557ebbe701 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -296,6 +296,7 @@ void __iomem * __init early_io_map(phys_addr_t phys, unsigned long virt) static void __init map_mem(void) { struct memblock_region *reg; + phys_addr_t limit; /* * Temporarily limit the memblock range. We need to do this as @@ -303,9 +304,11 @@ static void __init map_mem(void) * memory addressable from the initial direct kernel mapping. * * The initial direct kernel mapping, located at swapper_pg_dir, - * gives us PGDIR_SIZE memory starting from PHYS_OFFSET (aligned). + * gives us PGDIR_SIZE memory starting from PHYS_OFFSET (which must be + * aligned to 2MB as per Documentation/arm64/booting.txt). */ - memblock_set_current_limit((PHYS_OFFSET & PGDIR_MASK) + PGDIR_SIZE); + limit = PHYS_OFFSET + PGDIR_SIZE; + memblock_set_current_limit(limit); /* map all the memory banks */ for_each_memblock(memory, reg) { @@ -315,6 +318,22 @@ static void __init map_mem(void) if (start >= end) break; +#ifndef CONFIG_ARM64_64K_PAGES + /* + * For the first memory bank align the start address and + * current memblock limit to prevent create_mapping() from + * allocating pte page tables from unmapped memory. + * When 64K pages are enabled, the pte page table for the + * first PGDIR_SIZE is already present in swapper_pg_dir. + */ + if (start < limit) + start = ALIGN(start, PMD_SIZE); + if (end < limit) { + limit = end & PMD_MASK; + memblock_set_current_limit(limit); + } +#endif + create_mapping(start, __phys_to_virt(start), end - start); } |