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/addrspace.h>
   9#include <abi/pgtable-bits.h>
  10#include <asm-generic/pgtable-nopmd.h>
  11
  12#define PGDIR_SHIFT             22
  13#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  14#define PGDIR_MASK              (~(PGDIR_SIZE-1))
  15
  16#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  17#define FIRST_USER_ADDRESS      0UL
  18
  19#define PKMAP_BASE              (0xff800000)
  20
  21#define VMALLOC_START           (0xc0008000)
  22#define VMALLOC_END             (PKMAP_BASE - 2*PAGE_SIZE)
  23
  24/*
  25 * C-SKY is two-level paging structure:
  26 */
  27#define PGD_ORDER       0
  28#define PTE_ORDER       0
  29
  30#define PTRS_PER_PGD    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
  31#define PTRS_PER_PMD    1
  32#define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
  33
  34#define pte_ERROR(e) \
  35        pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
  36#define pgd_ERROR(e) \
  37        pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  38
  39/* Find an entry in the third-level page table.. */
  40#define __pte_offset_t(address) \
  41        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
  42#define pte_offset_kernel(dir, address) \
  43        (pmd_page_vaddr(*(dir)) + __pte_offset_t(address))
  44#define pte_offset_map(dir, address) \
  45        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address))
  46#define pmd_page(pmd)   (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  47#define pte_clear(mm, addr, ptep)       set_pte((ptep), \
  48        (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
  49#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  50#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  51#define pte_pfn(x)      ((unsigned long)((x).pte_low >> PAGE_SHIFT))
  52#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
  53                                | pgprot_val(prot))
  54
  55#define __READABLE      (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
  56#define __WRITEABLE     (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
  57
  58#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
  59                         _CACHE_MASK)
  60
  61#define pte_unmap(pte)  ((void)(pte))
  62
  63#define __swp_type(x)                   (((x).val >> 4) & 0xff)
  64#define __swp_offset(x)                 ((x).val >> 12)
  65#define __swp_entry(type, offset)       ((swp_entry_t) {((type) << 4) | \
  66                                        ((offset) << 12) })
  67#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
  68#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  69
  70#define pte_page(x)                     pfn_to_page(pte_pfn(x))
  71#define __mk_pte(page_nr, pgprot)       __pte(((page_nr) << PAGE_SHIFT) | \
  72                                        pgprot_val(pgprot))
  73
  74/*
  75 * CSKY can't do page protection for execute, and considers that the same like
  76 * read. Also, write permissions imply read permissions. This is the closest
  77 * we can get by reasonable means..
  78 */
  79#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
  80#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  81                                _CACHE_CACHED)
  82#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  83#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  84#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  85                                _PAGE_GLOBAL | _CACHE_CACHED)
  86#define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  87                                _CACHE_CACHED)
  88
  89#define __P000  PAGE_NONE
  90#define __P001  PAGE_READONLY
  91#define __P010  PAGE_COPY
  92#define __P011  PAGE_COPY
  93#define __P100  PAGE_READONLY
  94#define __P101  PAGE_READONLY
  95#define __P110  PAGE_COPY
  96#define __P111  PAGE_COPY
  97
  98#define __S000  PAGE_NONE
  99#define __S001  PAGE_READONLY
 100#define __S010  PAGE_SHARED
 101#define __S011  PAGE_SHARED
 102#define __S100  PAGE_READONLY
 103#define __S101  PAGE_READONLY
 104#define __S110  PAGE_SHARED
 105#define __S111  PAGE_SHARED
 106
 107extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 108#define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
 109
 110extern void load_pgd(unsigned long pg_dir);
 111extern pte_t invalid_pte_table[PTRS_PER_PTE];
 112
 113static inline int pte_special(pte_t pte) { return 0; }
 114static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 115
 116static inline void set_pte(pte_t *p, pte_t pte)
 117{
 118        *p = pte;
 119#if defined(CONFIG_CPU_NEED_TLBSYNC)
 120        dcache_wb_line((u32)p);
 121#endif
 122        /* prevent out of order excution */
 123        smp_mb();
 124}
 125#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 126
 127static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 128{
 129        unsigned long ptr;
 130
 131        ptr = pmd_val(pmd);
 132
 133        return __va(ptr);
 134}
 135
 136#define pmd_phys(pmd) pmd_val(pmd)
 137
 138static inline void set_pmd(pmd_t *p, pmd_t pmd)
 139{
 140        *p = pmd;
 141#if defined(CONFIG_CPU_NEED_TLBSYNC)
 142        dcache_wb_line((u32)p);
 143#endif
 144        /* prevent specul excute */
 145        smp_mb();
 146}
 147
 148
 149static inline int pmd_none(pmd_t pmd)
 150{
 151        return pmd_val(pmd) == __pa(invalid_pte_table);
 152}
 153
 154#define pmd_bad(pmd)    (pmd_val(pmd) & ~PAGE_MASK)
 155
 156static inline int pmd_present(pmd_t pmd)
 157{
 158        return (pmd_val(pmd) != __pa(invalid_pte_table));
 159}
 160
 161static inline void pmd_clear(pmd_t *p)
 162{
 163        pmd_val(*p) = (__pa(invalid_pte_table));
 164#if defined(CONFIG_CPU_NEED_TLBSYNC)
 165        dcache_wb_line((u32)p);
 166#endif
 167}
 168
 169/*
 170 * The following only work if pte_present() is true.
 171 * Undefined behaviour if not..
 172 */
 173static inline int pte_read(pte_t pte)
 174{
 175        return pte.pte_low & _PAGE_READ;
 176}
 177
 178static inline int pte_write(pte_t pte)
 179{
 180        return (pte).pte_low & _PAGE_WRITE;
 181}
 182
 183static inline int pte_dirty(pte_t pte)
 184{
 185        return (pte).pte_low & _PAGE_MODIFIED;
 186}
 187
 188static inline int pte_young(pte_t pte)
 189{
 190        return (pte).pte_low & _PAGE_ACCESSED;
 191}
 192
 193static inline pte_t pte_wrprotect(pte_t pte)
 194{
 195        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 196        return pte;
 197}
 198
 199static inline pte_t pte_mkclean(pte_t pte)
 200{
 201        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
 202        return pte;
 203}
 204
 205static inline pte_t pte_mkold(pte_t pte)
 206{
 207        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
 208        return pte;
 209}
 210
 211static inline pte_t pte_mkwrite(pte_t pte)
 212{
 213        pte_val(pte) |= _PAGE_WRITE;
 214        if (pte_val(pte) & _PAGE_MODIFIED)
 215                pte_val(pte) |= _PAGE_DIRTY;
 216        return pte;
 217}
 218
 219static inline pte_t pte_mkdirty(pte_t pte)
 220{
 221        pte_val(pte) |= _PAGE_MODIFIED;
 222        if (pte_val(pte) & _PAGE_WRITE)
 223                pte_val(pte) |= _PAGE_DIRTY;
 224        return pte;
 225}
 226
 227static inline pte_t pte_mkyoung(pte_t pte)
 228{
 229        pte_val(pte) |= _PAGE_ACCESSED;
 230        if (pte_val(pte) & _PAGE_READ)
 231                pte_val(pte) |= _PAGE_VALID;
 232        return pte;
 233}
 234
 235#define __pgd_offset(address)   pgd_index(address)
 236#define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 237#define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 238
 239/* to find an entry in a kernel page-table-directory */
 240#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 241
 242#define pgd_index(address)      ((address) >> PGDIR_SHIFT)
 243
 244#define __HAVE_PHYS_MEM_ACCESS_PROT
 245struct file;
 246extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 247                                     unsigned long size, pgprot_t vma_prot);
 248
 249/*
 250 * Macro to make mark a page protection value as "uncacheable".  Note
 251 * that "protection" is really a misnomer here as the protection value
 252 * contains the memory attribute bits, dirty bits, and various other
 253 * bits as well.
 254 */
 255#define pgprot_noncached pgprot_noncached
 256
 257static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 258{
 259        unsigned long prot = pgprot_val(_prot);
 260
 261        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
 262
 263        return __pgprot(prot);
 264}
 265
 266#define pgprot_writecombine pgprot_writecombine
 267static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 268{
 269        unsigned long prot = pgprot_val(_prot);
 270
 271        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 272
 273        return __pgprot(prot);
 274}
 275
 276/*
 277 * Conversion functions: convert a page and protection to a page entry,
 278 * and a page entry and page directory to the page they refer to.
 279 */
 280#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 281static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 282{
 283        return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 284                     (pgprot_val(newprot)));
 285}
 286
 287/* to find an entry in a page-table-directory */
 288static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
 289{
 290        return mm->pgd + pgd_index(address);
 291}
 292
 293/* Find an entry in the third-level page table.. */
 294static inline pte_t *pte_offset(pmd_t *dir, unsigned long address)
 295{
 296        return (pte_t *) (pmd_page_vaddr(*dir)) +
 297                ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 298}
 299
 300extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 301extern void paging_init(void);
 302
 303void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 304                      pte_t *pte);
 305
 306/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 307#define kern_addr_valid(addr)   (1)
 308
 309#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 310        remap_pfn_range(vma, vaddr, pfn, size, prot)
 311
 312#include <asm-generic/pgtable.h>
 313
 314#endif /* __ASM_CSKY_PGTABLE_H */
 315