1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_PGTABLE_H
3 #define _ASM_POWERPC_NOHASH_PGTABLE_H
5 #if defined(CONFIG_PPC64)
6 #include <asm/nohash/64/pgtable.h>
8 #include <asm/nohash/32/pgtable.h>
13 /* Generic accessors to PTE bits */
14 static inline int pte_write(pte_t pte)
16 return (pte_val(pte) & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO;
18 static inline int pte_read(pte_t pte) { return 1; }
19 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
20 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
21 static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
22 static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
24 #ifdef CONFIG_NUMA_BALANCING
26 * These work without NUMA balancing but the kernel does not care. See the
27 * comment in include/asm-generic/pgtable.h . On powerpc, this will only
28 * work for user pages and always return true for kernel pages.
30 static inline int pte_protnone(pte_t pte)
32 return (pte_val(pte) &
33 (_PAGE_PRESENT | _PAGE_USER)) == _PAGE_PRESENT;
36 static inline int pmd_protnone(pmd_t pmd)
38 return pte_protnone(pmd_pte(pmd));
40 #endif /* CONFIG_NUMA_BALANCING */
42 static inline int pte_present(pte_t pte)
44 return pte_val(pte) & _PAGE_PRESENT;
48 * We only find page table entry in the last level
49 * Hence no need for other accessors
51 #define pte_access_permitted pte_access_permitted
52 static inline bool pte_access_permitted(pte_t pte, bool write)
54 unsigned long pteval = pte_val(pte);
56 * A read-only access is controlled by _PAGE_USER bit.
57 * We have _PAGE_READ set for WRITE and EXECUTE
59 unsigned long need_pte_bits = _PAGE_PRESENT | _PAGE_USER;
62 need_pte_bits |= _PAGE_WRITE;
64 if ((pteval & need_pte_bits) != need_pte_bits)
70 /* Conversion functions: convert a page and protection to a page entry,
71 * and a page entry and page directory to the page they refer to.
73 * Even if PTEs can be unsigned long long, a PFN is always an unsigned
76 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) {
77 return __pte(((pte_basic_t)(pfn) << PTE_RPN_SHIFT) |
78 pgprot_val(pgprot)); }
79 static inline unsigned long pte_pfn(pte_t pte) {
80 return pte_val(pte) >> PTE_RPN_SHIFT; }
82 /* Generic modifiers for PTE bits */
83 static inline pte_t pte_wrprotect(pte_t pte)
87 ptev = pte_val(pte) & ~(_PAGE_RW | _PAGE_HWWRITE);
92 static inline pte_t pte_mkclean(pte_t pte)
94 return __pte(pte_val(pte) & ~(_PAGE_DIRTY | _PAGE_HWWRITE));
97 static inline pte_t pte_mkold(pte_t pte)
99 return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
102 static inline pte_t pte_mkwrite(pte_t pte)
106 ptev = pte_val(pte) & ~_PAGE_RO;
111 static inline pte_t pte_mkdirty(pte_t pte)
113 return __pte(pte_val(pte) | _PAGE_DIRTY);
116 static inline pte_t pte_mkyoung(pte_t pte)
118 return __pte(pte_val(pte) | _PAGE_ACCESSED);
121 static inline pte_t pte_mkspecial(pte_t pte)
123 return __pte(pte_val(pte) | _PAGE_SPECIAL);
126 static inline pte_t pte_mkhuge(pte_t pte)
128 return __pte(pte_val(pte) | _PAGE_HUGE);
131 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
133 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
136 /* Insert a PTE, top-level function is out of line. It uses an inline
137 * low level function in the respective pgtable-* files
139 extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
142 /* This low level function performs the actual PTE insertion
143 * Setting the PTE depends on the MMU type and other factors. It's
144 * an horrible mess that I'm not going to try to clean up now but
145 * I'm keeping it in one place rather than spread around
147 static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
148 pte_t *ptep, pte_t pte, int percpu)
150 /* Second case is 32-bit with 64-bit PTE. In this case, we
151 * can just store as long as we do the two halves in the right order
152 * with a barrier in between.
153 * In the percpu case, we also fallback to the simple update
155 if (IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_PTE_64BIT) && !percpu) {
156 __asm__ __volatile__("\
160 : "=m" (*ptep), "=m" (*((unsigned char *)ptep+4))
161 : "r" (pte) : "memory");
164 /* Anything else just stores the PTE normally. That covers all 64-bit
165 * cases, and 32-bit non-hash with 32-bit PTEs.
170 * With hardware tablewalk, a sync is needed to ensure that
171 * subsequent accesses see the PTE we just wrote. Unlike userspace
172 * mappings, we can't tolerate spurious faults, so make sure
173 * the new PTE will be seen the first time.
175 if (IS_ENABLED(CONFIG_PPC_BOOK3E_64) && is_kernel_addr(addr))
180 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
181 extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
182 pte_t *ptep, pte_t entry, int dirty);
185 * Macro to mark a page protection value as "uncacheable".
188 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \
191 #define pgprot_noncached(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
192 _PAGE_NO_CACHE | _PAGE_GUARDED))
194 #define pgprot_noncached_wc(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
197 #define pgprot_cached(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
200 #if _PAGE_WRITETHRU != 0
201 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
202 _PAGE_COHERENT | _PAGE_WRITETHRU))
205 #define pgprot_cached_noncoherent(prot) \
206 (__pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL))
208 #define pgprot_writecombine pgprot_noncached_wc
211 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
212 unsigned long size, pgprot_t vma_prot);
213 #define __HAVE_PHYS_MEM_ACCESS_PROT
215 #ifdef CONFIG_HUGETLB_PAGE
216 static inline int hugepd_ok(hugepd_t hpd)
218 #ifdef CONFIG_PPC_8xx
219 return ((hpd_val(hpd) & 0x4) != 0);
221 /* We clear the top bit to indicate hugepd */
222 return (hpd_val(hpd) && (hpd_val(hpd) & PD_HUGE) == 0);
226 static inline int pmd_huge(pmd_t pmd)
231 static inline int pud_huge(pud_t pud)
236 static inline int pgd_huge(pgd_t pgd)
240 #define pgd_huge pgd_huge
242 #define is_hugepd(hpd) (hugepd_ok(hpd))
245 #endif /* __ASSEMBLY__ */