1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H
3 #define _ASM_POWERPC_NOHASH_64_PGTABLE_H
5 * This file contains the functions and defines necessary to modify and use
6 * the ppc64 hashed page table.
9 #ifdef CONFIG_PPC_64K_PAGES
10 #include <asm/nohash/64/pgtable-64k.h>
12 #include <asm/nohash/64/pgtable-4k.h>
14 #include <asm/barrier.h>
16 #define FIRST_USER_ADDRESS 0UL
19 * Size of EA range mapped by our pagetables.
21 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
22 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
23 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
25 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
26 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
28 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
32 * Define the address range of the kernel non-linear virtual area
34 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
35 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
38 * The vmalloc space starts at the beginning of that region, and
39 * occupies half of it on hash CPUs and a quarter of it on Book3E
40 * (we keep a quarter for the virtual memmap)
42 #define VMALLOC_START KERN_VIRT_START
43 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
44 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
47 * The second half of the kernel virtual space is used for IO mappings,
48 * it's itself carved into the PIO region (ISA and PHB IO space) and
51 * ISA_IO_BASE = KERN_IO_START, 64K reserved area
52 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
53 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
55 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
56 #define FULL_IO_SIZE 0x80000000ul
57 #define ISA_IO_BASE (KERN_IO_START)
58 #define ISA_IO_END (KERN_IO_START + 0x10000ul)
59 #define PHB_IO_BASE (ISA_IO_END)
60 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
61 #define IOREMAP_BASE (PHB_IO_END)
62 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE)
68 #define REGION_SHIFT 60UL
69 #define REGION_MASK (0xfUL << REGION_SHIFT)
70 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
72 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
73 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
74 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
75 #define USER_REGION_ID (0UL)
78 * Defines the address of the vmemap area, in its own region on
79 * hash table CPUs and after the vmalloc space on Book3E
81 #define VMEMMAP_BASE VMALLOC_END
82 #define VMEMMAP_END KERN_IO_START
83 #define vmemmap ((struct page *)VMEMMAP_BASE)
87 * Include the PTE bits definitions
89 #include <asm/nohash/pte-book3e.h>
90 #include <asm/pte-common.h>
93 /* pte_clear moved to later in this file */
95 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
96 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
98 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
103 static inline void pmd_clear(pmd_t *pmdp)
108 static inline pte_t pmd_pte(pmd_t pmd)
110 return __pte(pmd_val(pmd));
113 #define pmd_none(pmd) (!pmd_val(pmd))
114 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
115 || (pmd_val(pmd) & PMD_BAD_BITS))
116 #define pmd_present(pmd) (!pmd_none(pmd))
117 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
118 extern struct page *pmd_page(pmd_t pmd);
120 static inline void pud_set(pud_t *pudp, unsigned long val)
125 static inline void pud_clear(pud_t *pudp)
130 #define pud_none(pud) (!pud_val(pud))
131 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
132 || (pud_val(pud) & PUD_BAD_BITS))
133 #define pud_present(pud) (pud_val(pud) != 0)
134 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
136 extern struct page *pud_page(pud_t pud);
138 static inline pte_t pud_pte(pud_t pud)
140 return __pte(pud_val(pud));
143 static inline pud_t pte_pud(pte_t pte)
145 return __pud(pte_val(pte));
147 #define pud_write(pud) pte_write(pud_pte(pud))
148 #define pgd_write(pgd) pte_write(pgd_pte(pgd))
150 static inline void pgd_set(pgd_t *pgdp, unsigned long val)
156 * Find an entry in a page-table-directory. We combine the address region
157 * (the high order N bits) and the pgd portion of the address.
159 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
161 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
163 #define pmd_offset(pudp,addr) \
164 (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
166 #define pte_offset_kernel(dir,addr) \
167 (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
169 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
170 #define pte_unmap(pte) do { } while(0)
172 /* to find an entry in a kernel page-table-directory */
173 /* This now only contains the vmalloc pages */
174 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
175 extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
176 pte_t *ptep, unsigned long pte, int huge);
178 /* Atomic PTE updates */
179 static inline unsigned long pte_update(struct mm_struct *mm,
181 pte_t *ptep, unsigned long clr,
185 #ifdef PTE_ATOMIC_UPDATES
186 unsigned long old, tmp;
188 __asm__ __volatile__(
189 "1: ldarx %0,0,%3 # pte_update\n\
196 : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
197 : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY), "r" (set)
200 unsigned long old = pte_val(*ptep);
201 *ptep = __pte((old & ~clr) | set);
203 /* huge pages use the old page table lock */
205 assert_pte_locked(mm, addr);
207 #ifdef CONFIG_PPC_STD_MMU_64
208 if (old & _PAGE_HASHPTE)
209 hpte_need_flush(mm, addr, ptep, old, huge);
215 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
216 unsigned long addr, pte_t *ptep)
220 if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
222 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
223 return (old & _PAGE_ACCESSED) != 0;
225 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
226 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
229 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
233 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
234 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
238 if ((pte_val(*ptep) & _PAGE_RW) == 0)
241 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
244 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
245 unsigned long addr, pte_t *ptep)
247 if ((pte_val(*ptep) & _PAGE_RW) == 0)
250 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
254 * We currently remove entries from the hashtable regardless of whether
255 * the entry was young or dirty. The generic routines only flush if the
256 * entry was young or dirty which is not good enough.
258 * We should be more intelligent about this but for the moment we override
259 * these functions and force a tlb flush unconditionally
261 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
262 #define ptep_clear_flush_young(__vma, __address, __ptep) \
264 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
269 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
270 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
271 unsigned long addr, pte_t *ptep)
273 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
277 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
280 pte_update(mm, addr, ptep, ~0UL, 0, 0);
284 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
285 * function doesn't need to flush the hash entry
287 static inline void __ptep_set_access_flags(struct mm_struct *mm,
288 pte_t *ptep, pte_t entry,
289 unsigned long address)
291 unsigned long bits = pte_val(entry) &
292 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
294 #ifdef PTE_ATOMIC_UPDATES
295 unsigned long old, tmp;
297 __asm__ __volatile__(
304 :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
305 :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
308 unsigned long old = pte_val(*ptep);
309 *ptep = __pte(old | bits);
313 #define __HAVE_ARCH_PTE_SAME
314 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
316 #define pte_ERROR(e) \
317 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
318 #define pmd_ERROR(e) \
319 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
320 #define pgd_ERROR(e) \
321 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
323 /* Encode and de-code a swap entry */
324 #define MAX_SWAPFILES_CHECK() do { \
325 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
327 * Don't have overlapping bits with _PAGE_HPTEFLAGS \
328 * We filter HPTEFLAGS on set_pte. \
330 BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
333 * on pte we don't need handle RADIX_TREE_EXCEPTIONAL_SHIFT;
335 #define SWP_TYPE_BITS 5
336 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
337 & ((1UL << SWP_TYPE_BITS) - 1))
338 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
339 #define __swp_entry(type, offset) ((swp_entry_t) { \
340 ((type) << _PAGE_BIT_SWAP_TYPE) \
341 | ((offset) << PTE_RPN_SHIFT) })
343 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
344 #define __swp_entry_to_pte(x) __pte((x).val)
346 extern int map_kernel_page(unsigned long ea, unsigned long pa,
347 unsigned long flags);
348 extern int __meminit vmemmap_create_mapping(unsigned long start,
349 unsigned long page_size,
351 extern void vmemmap_remove_mapping(unsigned long start,
352 unsigned long page_size);
353 #endif /* __ASSEMBLY__ */
355 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */