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 non-hashed page table.
9 #include <asm/nohash/64/pgtable-4k.h>
10 #include <asm/barrier.h>
11 #include <asm/asm-const.h>
13 #ifdef CONFIG_PPC_64K_PAGES
14 #error "Page size not supported"
17 #define FIRST_USER_ADDRESS 0UL
20 * Size of EA range mapped by our pagetables.
22 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
23 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
24 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
26 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
27 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
29 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
31 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
34 * Define the address range of the kernel non-linear virtual area
36 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
37 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
40 * The vmalloc space starts at the beginning of that region, and
41 * occupies a quarter of it on Book3E
42 * (we keep a quarter for the virtual memmap)
44 #define VMALLOC_START KERN_VIRT_START
45 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
46 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
49 * The second half of the kernel virtual space is used for IO mappings,
50 * it's itself carved into the PIO region (ISA and PHB IO space) and
53 * ISA_IO_BASE = KERN_IO_START, 64K reserved area
54 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
55 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
57 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
58 #define FULL_IO_SIZE 0x80000000ul
59 #define ISA_IO_BASE (KERN_IO_START)
60 #define ISA_IO_END (KERN_IO_START + 0x10000ul)
61 #define PHB_IO_BASE (ISA_IO_END)
62 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
63 #define IOREMAP_BASE (PHB_IO_END)
64 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE)
70 #define REGION_SHIFT 60UL
71 #define REGION_MASK (0xfUL << REGION_SHIFT)
72 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
74 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
75 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
76 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
77 #define USER_REGION_ID (0UL)
80 * Defines the address of the vmemap area, in its own region on
81 * after the vmalloc space on Book3E
83 #define VMEMMAP_BASE VMALLOC_END
84 #define VMEMMAP_END KERN_IO_START
85 #define vmemmap ((struct page *)VMEMMAP_BASE)
89 * Include the PTE bits definitions
91 #include <asm/nohash/pte-book3e.h>
92 #include <asm/pte-common.h>
95 /* pte_clear moved to later in this file */
97 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
98 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
100 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
105 static inline void pmd_clear(pmd_t *pmdp)
110 static inline pte_t pmd_pte(pmd_t pmd)
112 return __pte(pmd_val(pmd));
115 #define pmd_none(pmd) (!pmd_val(pmd))
116 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
117 || (pmd_val(pmd) & PMD_BAD_BITS))
118 #define pmd_present(pmd) (!pmd_none(pmd))
119 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
120 extern struct page *pmd_page(pmd_t pmd);
122 static inline void pud_set(pud_t *pudp, unsigned long val)
127 static inline void pud_clear(pud_t *pudp)
132 #define pud_none(pud) (!pud_val(pud))
133 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
134 || (pud_val(pud) & PUD_BAD_BITS))
135 #define pud_present(pud) (pud_val(pud) != 0)
136 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
138 extern struct page *pud_page(pud_t pud);
140 static inline pte_t pud_pte(pud_t pud)
142 return __pte(pud_val(pud));
145 static inline pud_t pte_pud(pte_t pte)
147 return __pud(pte_val(pte));
149 #define pud_write(pud) pte_write(pud_pte(pud))
150 #define pgd_write(pgd) pte_write(pgd_pte(pgd))
152 static inline void pgd_set(pgd_t *pgdp, unsigned long val)
158 * Find an entry in a page-table-directory. We combine the address region
159 * (the high order N bits) and the pgd portion of the address.
161 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
163 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
165 #define pmd_offset(pudp,addr) \
166 (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
168 #define pte_offset_kernel(dir,addr) \
169 (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
171 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
172 #define pte_unmap(pte) do { } while(0)
174 /* to find an entry in a kernel page-table-directory */
175 /* This now only contains the vmalloc pages */
176 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
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\
194 : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
195 : "r" (ptep), "r" (clr), "m" (*ptep), "r" (set)
198 unsigned long old = pte_val(*ptep);
199 *ptep = __pte((old & ~clr) | set);
201 /* huge pages use the old page table lock */
203 assert_pte_locked(mm, addr);
208 static inline int pte_young(pte_t pte)
210 return pte_val(pte) & _PAGE_ACCESSED;
213 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
214 unsigned long addr, pte_t *ptep)
218 if (pte_young(*ptep))
220 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
221 return (old & _PAGE_ACCESSED) != 0;
223 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
224 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
227 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
231 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
232 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
236 if ((pte_val(*ptep) & _PAGE_RW) == 0)
239 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
242 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
243 unsigned long addr, pte_t *ptep)
245 if ((pte_val(*ptep) & _PAGE_RW) == 0)
248 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
251 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
252 #define ptep_clear_flush_young(__vma, __address, __ptep) \
254 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
259 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
260 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
261 unsigned long addr, pte_t *ptep)
263 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
267 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
270 pte_update(mm, addr, ptep, ~0UL, 0, 0);
274 /* Set the dirty and/or accessed bits atomically in a linux PTE */
275 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
276 pte_t *ptep, pte_t entry,
277 unsigned long address,
280 unsigned long bits = pte_val(entry) &
281 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
283 #ifdef PTE_ATOMIC_UPDATES
284 unsigned long old, tmp;
286 __asm__ __volatile__(
291 :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
292 :"r" (bits), "r" (ptep), "m" (*ptep)
295 unsigned long old = pte_val(*ptep);
296 *ptep = __pte(old | bits);
299 flush_tlb_page(vma, address);
302 #define __HAVE_ARCH_PTE_SAME
303 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
305 #define pte_ERROR(e) \
306 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
307 #define pmd_ERROR(e) \
308 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
309 #define pgd_ERROR(e) \
310 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
312 /* Encode and de-code a swap entry */
313 #define MAX_SWAPFILES_CHECK() do { \
314 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
317 #define SWP_TYPE_BITS 5
318 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
319 & ((1UL << SWP_TYPE_BITS) - 1))
320 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
321 #define __swp_entry(type, offset) ((swp_entry_t) { \
322 ((type) << _PAGE_BIT_SWAP_TYPE) \
323 | ((offset) << PTE_RPN_SHIFT) })
325 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
326 #define __swp_entry_to_pte(x) __pte((x).val)
328 extern int map_kernel_page(unsigned long ea, unsigned long pa,
329 unsigned long flags);
330 extern int __meminit vmemmap_create_mapping(unsigned long start,
331 unsigned long page_size,
333 extern void vmemmap_remove_mapping(unsigned long start,
334 unsigned long page_size);
335 #endif /* __ASSEMBLY__ */
337 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */