| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifdef CONFIG_MMU |
| 3 | #include <linux/list.h> |
| 4 | #include <linux/vmalloc.h> |
| 5 | |
| 6 | #include <asm/pgtable.h> |
| 7 | |
| 8 | /* the upper-most page table pointer */ |
| 9 | extern pmd_t *top_pmd; |
| 10 | |
| 11 | /* |
| 12 | * 0xffff8000 to 0xffffffff is reserved for any ARM architecture |
| 13 | * specific hacks for copying pages efficiently, while 0xffff4000 |
| 14 | * is reserved for VIPT aliasing flushing by generic code. |
| 15 | * |
| 16 | * Note that we don't allow VIPT aliasing caches with SMP. |
| 17 | */ |
| 18 | #define COPYPAGE_MINICACHE 0xffff8000 |
| 19 | #define COPYPAGE_V6_FROM 0xffff8000 |
| 20 | #define COPYPAGE_V6_TO 0xffffc000 |
| 21 | /* PFN alias flushing, for VIPT caches */ |
| 22 | #define FLUSH_ALIAS_START 0xffff4000 |
| 23 | |
| 24 | static inline void set_top_pte(unsigned long va, pte_t pte) |
| 25 | { |
| 26 | pte_t *ptep = pte_offset_kernel(top_pmd, va); |
| 27 | set_pte_ext(ptep, pte, 0); |
| 28 | local_flush_tlb_kernel_page(va); |
| 29 | } |
| 30 | |
| 31 | static inline pte_t get_top_pte(unsigned long va) |
| 32 | { |
| 33 | pte_t *ptep = pte_offset_kernel(top_pmd, va); |
| 34 | return *ptep; |
| 35 | } |
| 36 | |
| 37 | static inline pmd_t *pmd_off_k(unsigned long virt) |
| 38 | { |
| 39 | return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt); |
| 40 | } |
| 41 | |
| 42 | struct mem_type { |
| 43 | pteval_t prot_pte; |
| 44 | pteval_t prot_pte_s2; |
| 45 | pmdval_t prot_l1; |
| 46 | pmdval_t prot_sect; |
| 47 | unsigned int domain; |
| 48 | }; |
| 49 | |
| 50 | const struct mem_type *get_mem_type(unsigned int type); |
| 51 | |
| 52 | extern void __flush_dcache_page(struct address_space *mapping, struct page *page); |
| 53 | |
| 54 | /* |
| 55 | * ARM specific vm_struct->flags bits. |
| 56 | */ |
| 57 | |
| 58 | /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ |
| 59 | #define VM_ARM_SECTION_MAPPING 0x80000000 |
| 60 | |
| 61 | /* permanent static mappings from iotable_init() */ |
| 62 | #define VM_ARM_STATIC_MAPPING 0x40000000 |
| 63 | |
| 64 | /* empty mapping */ |
| 65 | #define VM_ARM_EMPTY_MAPPING 0x20000000 |
| 66 | |
| 67 | /* mapping type (attributes) for permanent static mappings */ |
| 68 | #define VM_ARM_MTYPE(mt) ((mt) << 20) |
| 69 | #define VM_ARM_MTYPE_MASK (0x1f << 20) |
| 70 | |
| 71 | /* consistent regions used by dma_alloc_attrs() */ |
| 72 | #define VM_ARM_DMA_CONSISTENT 0x20000000 |
| 73 | |
| 74 | |
| 75 | struct static_vm { |
| 76 | struct vm_struct vm; |
| 77 | struct list_head list; |
| 78 | }; |
| 79 | |
| 80 | extern struct list_head static_vmlist; |
| 81 | extern struct static_vm *find_static_vm_vaddr(void *vaddr); |
| 82 | extern __init void add_static_vm_early(struct static_vm *svm); |
| 83 | |
| 84 | #endif |
| 85 | |
| 86 | #ifdef CONFIG_ZONE_DMA |
| 87 | extern phys_addr_t arm_dma_limit; |
| 88 | extern unsigned long arm_dma_pfn_limit; |
| 89 | #else |
| 90 | #define arm_dma_limit ((phys_addr_t)~0) |
| 91 | #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT) |
| 92 | #endif |
| 93 | |
| 94 | extern phys_addr_t arm_lowmem_limit; |
| 95 | |
| 96 | void __init bootmem_init(void); |
| 97 | void arm_mm_memblock_reserve(void); |
| 98 | void dma_contiguous_remap(void); |
| 99 | |
| 100 | unsigned long __clear_cr(unsigned long mask); |