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
7static 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
14static inline unsigned int hugepd_shift(hugepd_t hpd)
15{
16	return PAGE_SHIFT_8M;
17}
18
19static 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
27static inline void flush_hugetlb_page(struct vm_area_struct *vma,
28				      unsigned long vmaddr)
29{
30	flush_tlb_page(vma, vmaddr);
31}
32
33static 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
38static 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
43static 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
49void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
50		     pte_t pte, unsigned long sz);
51
52#define __HAVE_ARCH_HUGE_PTE_CLEAR
53static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
54				  pte_t *ptep, unsigned long sz)
55{
56	pte_update(mm, addr, ptep, ~0UL, 0, 1);
57}
58
59#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
60static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
61					   unsigned long addr, pte_t *ptep)
62{
63	unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
64	unsigned long set = pte_val(pte_wrprotect(__pte(0)));
65
66	pte_update(mm, addr, ptep, clr, set, 1);
67}
68
69#ifdef CONFIG_PPC_4K_PAGES
70static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
71{
72	size_t size = 1UL << shift;
73
74	if (size == SZ_16K)
75		return __pte(pte_val(entry) | _PAGE_SPS);
76	else
77		return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE);
78}
79#define arch_make_huge_pte arch_make_huge_pte
80#endif
81
82#endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */
83