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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifdef CONFIG_MMU
- #include <linux/list.h>
- #include <linux/vmalloc.h>
- #include <asm/pgtable.h>
- /* the upper-most page table pointer */
- extern pmd_t *top_pmd;
- /*
- * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
- * specific hacks for copying pages efficiently, while 0xffff4000
- * is reserved for VIPT aliasing flushing by generic code.
- *
- * Note that we don't allow VIPT aliasing caches with SMP.
- */
- #define COPYPAGE_MINICACHE 0xffff8000
- #define COPYPAGE_V6_FROM 0xffff8000
- #define COPYPAGE_V6_TO 0xffffc000
- /* PFN alias flushing, for VIPT caches */
- #define FLUSH_ALIAS_START 0xffff4000
- static inline void set_top_pte(unsigned long va, pte_t pte)
- {
- pte_t *ptep = pte_offset_kernel(top_pmd, va);
- set_pte_ext(ptep, pte, 0);
- local_flush_tlb_kernel_page(va);
- }
- static inline pte_t get_top_pte(unsigned long va)
- {
- pte_t *ptep = pte_offset_kernel(top_pmd, va);
- return *ptep;
- }
- static inline pmd_t *pmd_off_k(unsigned long virt)
- {
- return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
- }
- struct mem_type {
- pteval_t prot_pte;
- pteval_t prot_pte_s2;
- pmdval_t prot_l1;
- pmdval_t prot_sect;
- unsigned int domain;
- };
- const struct mem_type *get_mem_type(unsigned int type);
- extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
- /*
- * ARM specific vm_struct->flags bits.
- */
- /* (super)section-mapped I/O regions used by ioremap()/iounmap() */
- #define VM_ARM_SECTION_MAPPING 0x80000000
- /* permanent static mappings from iotable_init() */
- #define VM_ARM_STATIC_MAPPING 0x40000000
- /* empty mapping */
- #define VM_ARM_EMPTY_MAPPING 0x20000000
- /* mapping type (attributes) for permanent static mappings */
- #define VM_ARM_MTYPE(mt) ((mt) << 20)
- #define VM_ARM_MTYPE_MASK (0x1f << 20)
- /* consistent regions used by dma_alloc_attrs() */
- #define VM_ARM_DMA_CONSISTENT 0x20000000
- struct static_vm {
- struct vm_struct vm;
- struct list_head list;
- };
- extern struct list_head static_vmlist;
- extern struct static_vm *find_static_vm_vaddr(void *vaddr);
- extern __init void add_static_vm_early(struct static_vm *svm);
- #endif
- #ifdef CONFIG_ZONE_DMA
- extern phys_addr_t arm_dma_limit;
- extern unsigned long arm_dma_pfn_limit;
- #else
- #define arm_dma_limit ((phys_addr_t)~0)
- #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
- #endif
- extern phys_addr_t arm_lowmem_limit;
- void __init bootmem_init(void);
- void arm_mm_memblock_reserve(void);
- void dma_contiguous_remap(void);
- unsigned long __clear_cr(unsigned long mask);
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