1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
3 #define _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
4 
5 #define PAGE_SHIFT_8M		23
6 
7 static inline pte_t *hugepd_page(hugepd_t hpd)
8 {
9 	BUG_ON(!hugepd_ok(hpd));
10 
11 	return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
12 }
13 
14 static inline unsigned int hugepd_shift(hugepd_t hpd)
15 {
16 	return PAGE_SHIFT_8M;
17 }
18 
19 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
20 				    unsigned int pdshift)
21 {
22 	unsigned long idx = (addr & (SZ_4M - 1)) >> PAGE_SHIFT;
23 
24 	return hugepd_page(hpd) + idx;
25 }
26 
27 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
28 				      unsigned long vmaddr)
29 {
30 	flush_tlb_page(vma, vmaddr);
31 }
32 
33 static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
34 {
35 	*hpdp = __hugepd(__pa(new) | _PMD_USER | _PMD_PRESENT | _PMD_PAGE_8M);
36 }
37 
38 static inline void hugepd_populate_kernel(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
39 {
40 	*hpdp = __hugepd(__pa(new) | _PMD_PRESENT | _PMD_PAGE_8M);
41 }
42 
43 static inline int check_and_get_huge_psize(int shift)
44 {
45 	return shift_to_mmu_psize(shift);
46 }
47 
48 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
49 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
50 
51 #define __HAVE_ARCH_HUGE_PTE_CLEAR
52 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
53 				  pte_t *ptep, unsigned long sz)
54 {
55 	pte_update(mm, addr, ptep, ~0UL, 0, 1);
56 }
57 
58 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
59 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
60 					   unsigned long addr, pte_t *ptep)
61 {
62 	unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
63 	unsigned long set = pte_val(pte_wrprotect(__pte(0)));
64 
65 	pte_update(mm, addr, ptep, clr, set, 1);
66 }
67 
68 #ifdef CONFIG_PPC_4K_PAGES
69 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
70 				       struct page *page, int writable)
71 {
72 	size_t size = huge_page_size(hstate_vma(vma));
73 
74 	if (size == SZ_16K)
75 		return __pte(pte_val(entry) & ~_PAGE_HUGE);
76 	else
77 		return entry;
78 }
79 #define arch_make_huge_pte arch_make_huge_pte
80 #endif
81 
82 #endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */
83