| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | #ifdef CONFIG_MMU |
| 2 | |
| 3 | /* the upper-most page table pointer */ |
| 4 | extern pmd_t *top_pmd; |
| 5 | |
| 6 | /* |
| 7 | * 0xffff8000 to 0xffffffff is reserved for any ARM architecture |
| 8 | * specific hacks for copying pages efficiently, while 0xffff4000 |
| 9 | * is reserved for VIPT aliasing flushing by generic code. |
| 10 | * |
| 11 | * Note that we don't allow VIPT aliasing caches with SMP. |
| 12 | */ |
| 13 | #define COPYPAGE_MINICACHE 0xffff8000 |
| 14 | #define COPYPAGE_V6_FROM 0xffff8000 |
| 15 | #define COPYPAGE_V6_TO 0xffffc000 |
| 16 | /* PFN alias flushing, for VIPT caches */ |
| 17 | #define FLUSH_ALIAS_START 0xffff4000 |
| 18 | |
| 19 | static inline void set_top_pte(unsigned long va, pte_t pte) |
| 20 | { |
| 21 | pte_t *ptep = pte_offset_kernel(top_pmd, va); |
| 22 | set_pte_ext(ptep, pte, 0); |
| 23 | local_flush_tlb_kernel_page(va); |
| 24 | } |
| 25 | |
| 26 | static inline pte_t get_top_pte(unsigned long va) |
| 27 | { |
| 28 | pte_t *ptep = pte_offset_kernel(top_pmd, va); |
| 29 | return *ptep; |
| 30 | } |
| 31 | |
| 32 | static inline pmd_t *pmd_off_k(unsigned long virt) |
| 33 | { |
| 34 | return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt); |
| 35 | } |
| 36 | |
| 37 | struct mem_type { |
| 38 | pteval_t prot_pte; |
| 39 | pmdval_t prot_l1; |
| 40 | pmdval_t prot_sect; |
| 41 | unsigned int domain; |
| 42 | }; |
| 43 | |
| 44 | const struct mem_type *get_mem_type(unsigned int type); |
| 45 | |
| 46 | extern void __flush_dcache_page(struct address_space *mapping, struct page *page); |
| 47 | |
| 48 | /* |
| 49 | * ARM specific vm_struct->flags bits. |
| 50 | */ |
| 51 | |
| 52 | /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ |
| 53 | #define VM_ARM_SECTION_MAPPING 0x80000000 |
| 54 | |
| 55 | /* permanent static mappings from iotable_init() */ |
| 56 | #define VM_ARM_STATIC_MAPPING 0x40000000 |
| 57 | |
| 58 | /* empty mapping */ |
| 59 | #define VM_ARM_EMPTY_MAPPING 0x20000000 |
| 60 | |
| 61 | /* mapping type (attributes) for permanent static mappings */ |
| 62 | #define VM_ARM_MTYPE(mt) ((mt) << 20) |
| 63 | #define VM_ARM_MTYPE_MASK (0x1f << 20) |
| 64 | |
| 65 | #endif |
| 66 | |
| 67 | #ifdef CONFIG_ZONE_DMA |
| 68 | extern u32 arm_dma_limit; |
| 69 | #else |
| 70 | #define arm_dma_limit ((u32)~0) |
| 71 | #endif |
| 72 | |
| 73 | void __init bootmem_init(void); |
| 74 | void arm_mm_memblock_reserve(void); |