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 #define FIRST_USER_ADDRESS 0UL
16 * Size of EA range mapped by our pagetables.
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)
22 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
23 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
26 * Define the address range of the kernel non-linear virtual area
28 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
29 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
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)
36 #define VMALLOC_START KERN_VIRT_START
37 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
38 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
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
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
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)
63 #define REGION_SHIFT 60UL
64 #define REGION_MASK (0xfUL << REGION_SHIFT)
65 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
67 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
68 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
69 #define USER_REGION_ID (0UL)
72 * Defines the address of the vmemap area, in its own region on
73 * after the vmalloc space on Book3E
75 #define VMEMMAP_BASE VMALLOC_END
76 #define VMEMMAP_END KERN_IO_START
77 #define vmemmap ((struct page *)VMEMMAP_BASE)
81 * Include the PTE bits definitions
83 #include <asm/nohash/pte-book3e.h>
87 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
90 * _PAGE_CHG_MASK masks of bits that are to be preserved across
93 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
95 #define H_PAGE_4K_PFN 0
98 /* pte_clear moved to later in this file */
100 static inline pte_t pte_mkwrite(pte_t pte)
102 return __pte(pte_val(pte) | _PAGE_RW);
105 static inline pte_t pte_mkdirty(pte_t pte)
107 return __pte(pte_val(pte) | _PAGE_DIRTY);
110 static inline pte_t pte_mkyoung(pte_t pte)
112 return __pte(pte_val(pte) | _PAGE_ACCESSED);
115 static inline pte_t pte_wrprotect(pte_t pte)
117 return __pte(pte_val(pte) & ~_PAGE_RW);
120 static inline pte_t pte_mkexec(pte_t pte)
122 return __pte(pte_val(pte) | _PAGE_EXEC);
125 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
126 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
128 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
133 static inline void pmd_clear(pmd_t *pmdp)
138 static inline pte_t pmd_pte(pmd_t pmd)
140 return __pte(pmd_val(pmd));
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)
148 extern struct page *pmd_page(pmd_t pmd);
150 static inline void pud_set(pud_t *pudp, unsigned long val)
155 static inline void pud_clear(pud_t *pudp)
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)
166 extern struct page *pud_page(pud_t pud);
168 static inline pte_t pud_pte(pud_t pud)
170 return __pte(pud_val(pud));
173 static inline pud_t pte_pud(pte_t pte)
175 return __pud(pte_val(pte));
177 #define pud_write(pud) pte_write(pud_pte(pud))
178 #define pgd_write(pgd) pte_write(pgd_pte(pgd))
180 static inline void pgd_set(pgd_t *pgdp, unsigned long val)
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.
189 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
191 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
193 #define pmd_offset(pudp,addr) \
194 (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
196 #define pte_offset_kernel(dir,addr) \
197 (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
199 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
201 static inline void pte_unmap(pte_t *pte) { }
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)
207 /* Atomic PTE updates */
208 static inline unsigned long pte_update(struct mm_struct *mm,
210 pte_t *ptep, unsigned long clr,
214 #ifdef PTE_ATOMIC_UPDATES
215 unsigned long old, tmp;
217 __asm__ __volatile__(
218 "1: ldarx %0,0,%3 # pte_update\n\
223 : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
224 : "r" (ptep), "r" (clr), "m" (*ptep), "r" (set)
227 unsigned long old = pte_val(*ptep);
228 *ptep = __pte((old & ~clr) | set);
230 /* huge pages use the old page table lock */
232 assert_pte_locked(mm, addr);
237 static inline int pte_young(pte_t pte)
239 return pte_val(pte) & _PAGE_ACCESSED;
242 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
243 unsigned long addr, pte_t *ptep)
247 if (pte_young(*ptep))
249 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
250 return (old & _PAGE_ACCESSED) != 0;
252 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
253 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
256 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
260 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
261 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
265 if ((pte_val(*ptep) & _PAGE_RW) == 0)
268 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
271 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
272 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
273 unsigned long addr, pte_t *ptep)
275 if ((pte_val(*ptep) & _PAGE_RW) == 0)
278 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
281 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
282 #define ptep_clear_flush_young(__vma, __address, __ptep) \
284 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
289 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
290 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
291 unsigned long addr, pte_t *ptep)
293 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
297 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
300 pte_update(mm, addr, ptep, ~0UL, 0, 0);
304 /* Set the dirty and/or accessed bits atomically in a linux PTE */
305 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
306 pte_t *ptep, pte_t entry,
307 unsigned long address,
310 unsigned long bits = pte_val(entry) &
311 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
313 #ifdef PTE_ATOMIC_UPDATES
314 unsigned long old, tmp;
316 __asm__ __volatile__(
321 :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
322 :"r" (bits), "r" (ptep), "m" (*ptep)
325 unsigned long old = pte_val(*ptep);
326 *ptep = __pte(old | bits);
329 flush_tlb_page(vma, address);
332 #define __HAVE_ARCH_PTE_SAME
333 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
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))
342 /* Encode and de-code a swap entry */
343 #define MAX_SWAPFILES_CHECK() do { \
344 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
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) })
355 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
356 #define __swp_entry_to_pte(x) __pte((x).val)
358 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
359 extern int __meminit vmemmap_create_mapping(unsigned long start,
360 unsigned long page_size,
362 extern void vmemmap_remove_mapping(unsigned long start,
363 unsigned long page_size);
364 #endif /* __ASSEMBLY__ */
366 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */