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
   6#include <asm/pgtable.h>
   7
   8/* the upper-most page table pointer */
   9extern pmd_t *top_pmd;
  10
  11extern int icache_size;
  12
  13/*
  14 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
  15 * specific hacks for copying pages efficiently, while 0xffff4000
  16 * is reserved for VIPT aliasing flushing by generic code.
  17 *
  18 * Note that we don't allow VIPT aliasing caches with SMP.
  19 */
  20#define COPYPAGE_MINICACHE      0xffff8000
  21#define COPYPAGE_V6_FROM        0xffff8000
  22#define COPYPAGE_V6_TO          0xffffc000
  23/* PFN alias flushing, for VIPT caches */
  24#define FLUSH_ALIAS_START       0xffff4000
  25
  26static inline void set_top_pte(unsigned long va, pte_t pte)
  27{
  28        pte_t *ptep = pte_offset_kernel(top_pmd, va);
  29        set_pte_ext(ptep, pte, 0);
  30        local_flush_tlb_kernel_page(va);
  31}
  32
  33static inline pte_t get_top_pte(unsigned long va)
  34{
  35        pte_t *ptep = pte_offset_kernel(top_pmd, va);
  36        return *ptep;
  37}
  38
  39static inline pmd_t *pmd_off_k(unsigned long virt)
  40{
  41        return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
  42}
  43
  44struct mem_type {
  45        pteval_t prot_pte;
  46        pteval_t prot_pte_s2;
  47        pmdval_t prot_l1;
  48        pmdval_t prot_sect;
  49        unsigned int domain;
  50};
  51
  52const struct mem_type *get_mem_type(unsigned int type);
  53
  54extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
  55
  56/*
  57 * ARM specific vm_struct->flags bits.
  58 */
  59
  60/* (super)section-mapped I/O regions used by ioremap()/iounmap() */
  61#define VM_ARM_SECTION_MAPPING  0x80000000
  62
  63/* permanent static mappings from iotable_init() */
  64#define VM_ARM_STATIC_MAPPING   0x40000000
  65
  66/* empty mapping */
  67#define VM_ARM_EMPTY_MAPPING    0x20000000
  68
  69/* mapping type (attributes) for permanent static mappings */
  70#define VM_ARM_MTYPE(mt)                ((mt) << 20)
  71#define VM_ARM_MTYPE_MASK       (0x1f << 20)
  72
  73/* consistent regions used by dma_alloc_attrs() */
  74#define VM_ARM_DMA_CONSISTENT   0x20000000
  75
  76
  77struct static_vm {
  78        struct vm_struct vm;
  79        struct list_head list;
  80};
  81
  82extern struct list_head static_vmlist;
  83extern struct static_vm *find_static_vm_vaddr(void *vaddr);
  84extern __init void add_static_vm_early(struct static_vm *svm);
  85
  86#endif
  87
  88#ifdef CONFIG_ZONE_DMA
  89extern phys_addr_t arm_dma_limit;
  90extern unsigned long arm_dma_pfn_limit;
  91#else
  92#define arm_dma_limit ((phys_addr_t)~0)
  93#define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
  94#endif
  95
  96extern phys_addr_t arm_lowmem_limit;
  97
  98void __init bootmem_init(void);
  99void arm_mm_memblock_reserve(void);
 100void dma_contiguous_remap(void);
 101
 102unsigned long __clear_cr(unsigned long mask);
 103