LXR linux/arch/arm/mm/mm.h

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