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