LXR linux/arch/powerpc/include/asm/nohash/64/pgtable.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H
   3#define _ASM_POWERPC_NOHASH_64_PGTABLE_H
   4/*
   5 * This file contains the functions and defines necessary to modify and use
   6 * the ppc64 non-hashed page table.
   7 */
   8
   9#include <asm/nohash/64/pgtable-4k.h>
  10#include <asm/barrier.h>
  11#include <asm/asm-const.h>
  12
  13#define FIRST_USER_ADDRESS      0UL
  14
  15/*
  16 * Size of EA range mapped by our pagetables.
  17 */
  18#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  19                            PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  20#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
  21
  22#define PMD_CACHE_INDEX PMD_INDEX_SIZE
  23#define PUD_CACHE_INDEX PUD_INDEX_SIZE
  24
  25/*
  26 * Define the address range of the kernel non-linear virtual area
  27 */
  28#define KERN_VIRT_START ASM_CONST(0x8000000000000000)
  29#define KERN_VIRT_SIZE  ASM_CONST(0x0000100000000000)
  30
  31/*
  32 * The vmalloc space starts at the beginning of that region, and
  33 * occupies a quarter of it on Book3E
  34 * (we keep a quarter for the virtual memmap)
  35 */
  36#define VMALLOC_START   KERN_VIRT_START
  37#define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 2)
  38#define VMALLOC_END     (VMALLOC_START + VMALLOC_SIZE)
  39
  40/*
  41 * The second half of the kernel virtual space is used for IO mappings,
  42 * it's itself carved into the PIO region (ISA and PHB IO space) and
  43 * the ioremap space
  44 *
  45 *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
  46 *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
  47 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
  48 */
  49#define KERN_IO_START   (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
  50#define FULL_IO_SIZE    0x80000000ul
  51#define  ISA_IO_BASE    (KERN_IO_START)
  52#define  ISA_IO_END     (KERN_IO_START + 0x10000ul)
  53#define  PHB_IO_BASE    (ISA_IO_END)
  54#define  PHB_IO_END     (KERN_IO_START + FULL_IO_SIZE)
  55#define IOREMAP_BASE    (PHB_IO_END)
  56#define IOREMAP_START   (ioremap_bot)
  57#define IOREMAP_END     (KERN_VIRT_START + KERN_VIRT_SIZE)
  58
  59
  60/*
  61 * Region IDs
  62 */
  63#define REGION_SHIFT            60UL
  64#define REGION_MASK             (0xfUL << REGION_SHIFT)
  65#define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  66
  67#define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
  68#define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
  69#define USER_REGION_ID          (0UL)
  70
  71/*
  72 * Defines the address of the vmemap area, in its own region on
  73 * after the vmalloc space on Book3E
  74 */
  75#define VMEMMAP_BASE            VMALLOC_END
  76#define VMEMMAP_END             KERN_IO_START
  77#define vmemmap                 ((struct page *)VMEMMAP_BASE)
  78
  79
  80/*
  81 * Include the PTE bits definitions
  82 */
  83#include <asm/nohash/pte-book3e.h>
  84
  85#define _PAGE_SAO       0
  86
  87#define PTE_RPN_MASK    (~((1UL << PTE_RPN_SHIFT) - 1))
  88
  89/*
  90 * _PAGE_CHG_MASK masks of bits that are to be preserved across
  91 * pgprot changes.
  92 */
  93#define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
  94
  95#define H_PAGE_4K_PFN 0
  96
  97#ifndef __ASSEMBLY__
  98/* pte_clear moved to later in this file */
  99
 100static inline pte_t pte_mkwrite(pte_t pte)
 101{
 102        return __pte(pte_val(pte) | _PAGE_RW);
 103}
 104
 105static inline pte_t pte_mkdirty(pte_t pte)
 106{
 107        return __pte(pte_val(pte) | _PAGE_DIRTY);
 108}
 109
 110static inline pte_t pte_mkyoung(pte_t pte)
 111{
 112        return __pte(pte_val(pte) | _PAGE_ACCESSED);
 113}
 114
 115static inline pte_t pte_wrprotect(pte_t pte)
 116{
 117        return __pte(pte_val(pte) & ~_PAGE_RW);
 118}
 119
 120static inline pte_t pte_mkexec(pte_t pte)
 121{
 122        return __pte(pte_val(pte) | _PAGE_EXEC);
 123}
 124
 125#define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 126#define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 127
 128static inline void pmd_set(pmd_t *pmdp, unsigned long val)
 129{
 130        *pmdp = __pmd(val);
 131}
 132
 133static inline void pmd_clear(pmd_t *pmdp)
 134{
 135        *pmdp = __pmd(0);
 136}
 137
 138static inline pte_t pmd_pte(pmd_t pmd)
 139{
 140        return __pte(pmd_val(pmd));
 141}
 142
 143#define pmd_none(pmd)           (!pmd_val(pmd))
 144#define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
 145                                 || (pmd_val(pmd) & PMD_BAD_BITS))
 146#define pmd_present(pmd)        (!pmd_none(pmd))
 147#define pmd_page_vaddr(pmd)     (pmd_val(pmd) & ~PMD_MASKED_BITS)
 148extern struct page *pmd_page(pmd_t pmd);
 149
 150static inline void pud_set(pud_t *pudp, unsigned long val)
 151{
 152        *pudp = __pud(val);
 153}
 154
 155static inline void pud_clear(pud_t *pudp)
 156{
 157        *pudp = __pud(0);
 158}
 159
 160#define pud_none(pud)           (!pud_val(pud))
 161#define pud_bad(pud)            (!is_kernel_addr(pud_val(pud)) \
 162                                 || (pud_val(pud) & PUD_BAD_BITS))
 163#define pud_present(pud)        (pud_val(pud) != 0)
 164#define pud_page_vaddr(pud)     (pud_val(pud) & ~PUD_MASKED_BITS)
 165
 166extern struct page *pud_page(pud_t pud);
 167
 168static inline pte_t pud_pte(pud_t pud)
 169{
 170        return __pte(pud_val(pud));
 171}
 172
 173static inline pud_t pte_pud(pte_t pte)
 174{
 175        return __pud(pte_val(pte));
 176}
 177#define pud_write(pud)          pte_write(pud_pte(pud))
 178#define pgd_write(pgd)          pte_write(pgd_pte(pgd))
 179
 180static inline void pgd_set(pgd_t *pgdp, unsigned long val)
 181{
 182        *pgdp = __pgd(val);
 183}
 184
 185/*
 186 * Find an entry in a page-table-directory.  We combine the address region
 187 * (the high order N bits) and the pgd portion of the address.
 188 */
 189#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
 190
 191#define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 192
 193#define pmd_offset(pudp,addr) \
 194  (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 195
 196#define pte_offset_kernel(dir,addr) \
 197  (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 198
 199#define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 200
 201static inline void pte_unmap(pte_t *pte) { }
 202
 203/* to find an entry in a kernel page-table-directory */
 204/* This now only contains the vmalloc pages */
 205#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 206
 207/* Atomic PTE updates */
 208static inline unsigned long pte_update(struct mm_struct *mm,
 209                                       unsigned long addr,
 210                                       pte_t *ptep, unsigned long clr,
 211                                       unsigned long set,
 212                                       int huge)
 213{
 214#ifdef PTE_ATOMIC_UPDATES
 215        unsigned long old, tmp;
 216
 217        __asm__ __volatile__(
 218        "1:     ldarx   %0,0,%3         # pte_update\n\
 219        andc    %1,%0,%4 \n\
 220        or      %1,%1,%6\n\
 221        stdcx.  %1,0,%3 \n\
 222        bne-    1b"
 223        : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
 224        : "r" (ptep), "r" (clr), "m" (*ptep), "r" (set)
 225        : "cc" );
 226#else
 227        unsigned long old = pte_val(*ptep);
 228        *ptep = __pte((old & ~clr) | set);
 229#endif
 230        /* huge pages use the old page table lock */
 231        if (!huge)
 232                assert_pte_locked(mm, addr);
 233
 234        return old;
 235}
 236
 237static inline int pte_young(pte_t pte)
 238{
 239        return pte_val(pte) & _PAGE_ACCESSED;
 240}
 241
 242static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 243                                              unsigned long addr, pte_t *ptep)
 244{
 245        unsigned long old;
 246
 247        if (pte_young(*ptep))
 248                return 0;
 249        old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
 250        return (old & _PAGE_ACCESSED) != 0;
 251}
 252#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 253#define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 254({                                                                         \
 255        int __r;                                                           \
 256        __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 257        __r;                                                               \
 258})
 259
 260#define __HAVE_ARCH_PTEP_SET_WRPROTECT
 261static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 262                                      pte_t *ptep)
 263{
 264
 265        if ((pte_val(*ptep) & _PAGE_RW) == 0)
 266                return;
 267
 268        pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
 269}
 270
 271#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
 272static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 273                                           unsigned long addr, pte_t *ptep)
 274{
 275        if ((pte_val(*ptep) & _PAGE_RW) == 0)
 276                return;
 277
 278        pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
 279}
 280
 281#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 282#define ptep_clear_flush_young(__vma, __address, __ptep)                \
 283({                                                                      \
 284        int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 285                                                  __ptep);              \
 286        __young;                                                        \
 287})
 288
 289#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 290static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 291                                       unsigned long addr, pte_t *ptep)
 292{
 293        unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
 294        return __pte(old);
 295}
 296
 297static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 298                             pte_t * ptep)
 299{
 300        pte_update(mm, addr, ptep, ~0UL, 0, 0);
 301}
 302
 303
 304/* Set the dirty and/or accessed bits atomically in a linux PTE */
 305static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
 306                                           pte_t *ptep, pte_t entry,
 307                                           unsigned long address,
 308                                           int psize)
 309{
 310        unsigned long bits = pte_val(entry) &
 311                (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 312
 313#ifdef PTE_ATOMIC_UPDATES
 314        unsigned long old, tmp;
 315
 316        __asm__ __volatile__(
 317        "1:     ldarx   %0,0,%4\n\
 318                or      %0,%3,%0\n\
 319                stdcx.  %0,0,%4\n\
 320                bne-    1b"
 321        :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 322        :"r" (bits), "r" (ptep), "m" (*ptep)
 323        :"cc");
 324#else
 325        unsigned long old = pte_val(*ptep);
 326        *ptep = __pte(old | bits);
 327#endif
 328
 329        flush_tlb_page(vma, address);
 330}
 331
 332#define __HAVE_ARCH_PTE_SAME
 333#define pte_same(A,B)   ((pte_val(A) ^ pte_val(B)) == 0)
 334
 335#define pte_ERROR(e) \
 336        pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 337#define pmd_ERROR(e) \
 338        pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 339#define pgd_ERROR(e) \
 340        pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 341
 342/* Encode and de-code a swap entry */
 343#define MAX_SWAPFILES_CHECK() do { \
 344        BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
 345        } while (0)
 346
 347#define SWP_TYPE_BITS 5
 348#define __swp_type(x)           (((x).val >> _PAGE_BIT_SWAP_TYPE) \
 349                                & ((1UL << SWP_TYPE_BITS) - 1))
 350#define __swp_offset(x)         ((x).val >> PTE_RPN_SHIFT)
 351#define __swp_entry(type, offset)       ((swp_entry_t) { \
 352                                        ((type) << _PAGE_BIT_SWAP_TYPE) \
 353                                        | ((offset) << PTE_RPN_SHIFT) })
 354
 355#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 356#define __swp_entry_to_pte(x)           __pte((x).val)
 357
 358int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
 359extern int __meminit vmemmap_create_mapping(unsigned long start,
 360                                            unsigned long page_size,
 361                                            unsigned long phys);
 362extern void vmemmap_remove_mapping(unsigned long start,
 363                                   unsigned long page_size);
 364#endif /* __ASSEMBLY__ */
 365
 366#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
 367