LXR linux/arch/csky/include/asm/pgtable.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#ifndef __ASM_CSKY_PGTABLE_H
   5#define __ASM_CSKY_PGTABLE_H
   6
   7#include <asm/fixmap.h>
   8#include <asm/memory.h>
   9#include <asm/addrspace.h>
  10#include <abi/pgtable-bits.h>
  11#include <asm-generic/pgtable-nopmd.h>
  12
  13#define PGDIR_SHIFT             22
  14#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  15#define PGDIR_MASK              (~(PGDIR_SIZE-1))
  16
  17#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  18#define FIRST_USER_ADDRESS      0UL
  19
  20/*
  21 * C-SKY is two-level paging structure:
  22 */
  23#define PGD_ORDER       0
  24#define PTE_ORDER       0
  25
  26#define PTRS_PER_PGD    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
  27#define PTRS_PER_PMD    1
  28#define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
  29
  30#define pte_ERROR(e) \
  31        pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
  32#define pgd_ERROR(e) \
  33        pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  34
  35#define pmd_page(pmd)   (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  36#define pte_clear(mm, addr, ptep)       set_pte((ptep), \
  37        (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
  38#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  39#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  40#define pte_pfn(x)      ((unsigned long)((x).pte_low >> PAGE_SHIFT))
  41#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
  42                                | pgprot_val(prot))
  43
  44#define __READABLE      (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
  45#define __WRITEABLE     (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
  46
  47#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
  48                         _CACHE_MASK)
  49
  50#define __swp_type(x)                   (((x).val >> 4) & 0xff)
  51#define __swp_offset(x)                 ((x).val >> 12)
  52#define __swp_entry(type, offset)       ((swp_entry_t) {((type) << 4) | \
  53                                        ((offset) << 12) })
  54#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
  55#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  56
  57#define pte_page(x)                     pfn_to_page(pte_pfn(x))
  58#define __mk_pte(page_nr, pgprot)       __pte(((page_nr) << PAGE_SHIFT) | \
  59                                        pgprot_val(pgprot))
  60
  61/*
  62 * CSKY can't do page protection for execute, and considers that the same like
  63 * read. Also, write permissions imply read permissions. This is the closest
  64 * we can get by reasonable means..
  65 */
  66#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
  67#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  68                                _CACHE_CACHED)
  69#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  70#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  71#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  72                                _PAGE_GLOBAL | _CACHE_CACHED)
  73#define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  74                                _CACHE_CACHED)
  75
  76#define _PAGE_IOREMAP \
  77        (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
  78         _CACHE_UNCACHED | _PAGE_SO)
  79
  80#define __P000  PAGE_NONE
  81#define __P001  PAGE_READONLY
  82#define __P010  PAGE_COPY
  83#define __P011  PAGE_COPY
  84#define __P100  PAGE_READONLY
  85#define __P101  PAGE_READONLY
  86#define __P110  PAGE_COPY
  87#define __P111  PAGE_COPY
  88
  89#define __S000  PAGE_NONE
  90#define __S001  PAGE_READONLY
  91#define __S010  PAGE_SHARED
  92#define __S011  PAGE_SHARED
  93#define __S100  PAGE_READONLY
  94#define __S101  PAGE_READONLY
  95#define __S110  PAGE_SHARED
  96#define __S111  PAGE_SHARED
  97
  98extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  99#define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
 100
 101extern void load_pgd(unsigned long pg_dir);
 102extern pte_t invalid_pte_table[PTRS_PER_PTE];
 103
 104static inline void set_pte(pte_t *p, pte_t pte)
 105{
 106        *p = pte;
 107#if defined(CONFIG_CPU_NEED_TLBSYNC)
 108        dcache_wb_line((u32)p);
 109#endif
 110        /* prevent out of order excution */
 111        smp_mb();
 112}
 113#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 114
 115static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 116{
 117        unsigned long ptr;
 118
 119        ptr = pmd_val(pmd);
 120
 121        return __va(ptr);
 122}
 123
 124#define pmd_phys(pmd) pmd_val(pmd)
 125
 126static inline void set_pmd(pmd_t *p, pmd_t pmd)
 127{
 128        *p = pmd;
 129#if defined(CONFIG_CPU_NEED_TLBSYNC)
 130        dcache_wb_line((u32)p);
 131#endif
 132        /* prevent specul excute */
 133        smp_mb();
 134}
 135
 136
 137static inline int pmd_none(pmd_t pmd)
 138{
 139        return pmd_val(pmd) == __pa(invalid_pte_table);
 140}
 141
 142#define pmd_bad(pmd)    (pmd_val(pmd) & ~PAGE_MASK)
 143
 144static inline int pmd_present(pmd_t pmd)
 145{
 146        return (pmd_val(pmd) != __pa(invalid_pte_table));
 147}
 148
 149static inline void pmd_clear(pmd_t *p)
 150{
 151        pmd_val(*p) = (__pa(invalid_pte_table));
 152#if defined(CONFIG_CPU_NEED_TLBSYNC)
 153        dcache_wb_line((u32)p);
 154#endif
 155}
 156
 157/*
 158 * The following only work if pte_present() is true.
 159 * Undefined behaviour if not..
 160 */
 161static inline int pte_read(pte_t pte)
 162{
 163        return pte.pte_low & _PAGE_READ;
 164}
 165
 166static inline int pte_write(pte_t pte)
 167{
 168        return (pte).pte_low & _PAGE_WRITE;
 169}
 170
 171static inline int pte_dirty(pte_t pte)
 172{
 173        return (pte).pte_low & _PAGE_MODIFIED;
 174}
 175
 176static inline int pte_young(pte_t pte)
 177{
 178        return (pte).pte_low & _PAGE_ACCESSED;
 179}
 180
 181static inline pte_t pte_wrprotect(pte_t pte)
 182{
 183        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 184        return pte;
 185}
 186
 187static inline pte_t pte_mkclean(pte_t pte)
 188{
 189        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
 190        return pte;
 191}
 192
 193static inline pte_t pte_mkold(pte_t pte)
 194{
 195        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
 196        return pte;
 197}
 198
 199static inline pte_t pte_mkwrite(pte_t pte)
 200{
 201        pte_val(pte) |= _PAGE_WRITE;
 202        if (pte_val(pte) & _PAGE_MODIFIED)
 203                pte_val(pte) |= _PAGE_DIRTY;
 204        return pte;
 205}
 206
 207static inline pte_t pte_mkdirty(pte_t pte)
 208{
 209        pte_val(pte) |= _PAGE_MODIFIED;
 210        if (pte_val(pte) & _PAGE_WRITE)
 211                pte_val(pte) |= _PAGE_DIRTY;
 212        return pte;
 213}
 214
 215static inline pte_t pte_mkyoung(pte_t pte)
 216{
 217        pte_val(pte) |= _PAGE_ACCESSED;
 218        if (pte_val(pte) & _PAGE_READ)
 219                pte_val(pte) |= _PAGE_VALID;
 220        return pte;
 221}
 222
 223#define __HAVE_PHYS_MEM_ACCESS_PROT
 224struct file;
 225extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 226                                     unsigned long size, pgprot_t vma_prot);
 227
 228/*
 229 * Macro to make mark a page protection value as "uncacheable".  Note
 230 * that "protection" is really a misnomer here as the protection value
 231 * contains the memory attribute bits, dirty bits, and various other
 232 * bits as well.
 233 */
 234#define pgprot_noncached pgprot_noncached
 235
 236static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 237{
 238        unsigned long prot = pgprot_val(_prot);
 239
 240        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
 241
 242        return __pgprot(prot);
 243}
 244
 245#define pgprot_writecombine pgprot_writecombine
 246static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 247{
 248        unsigned long prot = pgprot_val(_prot);
 249
 250        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 251
 252        return __pgprot(prot);
 253}
 254
 255/*
 256 * Conversion functions: convert a page and protection to a page entry,
 257 * and a page entry and page directory to the page they refer to.
 258 */
 259#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 260static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 261{
 262        return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 263                     (pgprot_val(newprot)));
 264}
 265
 266extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 267extern void paging_init(void);
 268
 269void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 270                      pte_t *pte);
 271
 272/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 273#define kern_addr_valid(addr)   (1)
 274
 275#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 276        remap_pfn_range(vma, vaddr, pfn, size, prot)
 277
 278#endif /* __ASM_CSKY_PGTABLE_H */
 279