1#ifndef _ASM_POWERPC_HUGETLB_H
  2#define _ASM_POWERPC_HUGETLB_H
  3
  4#ifdef CONFIG_HUGETLB_PAGE
  5#include <asm/page.h>
  6
  7extern struct kmem_cache *hugepte_cache;
  8
  9static inline pte_t *hugepd_page(hugepd_t hpd)
 10{
 11	BUG_ON(!hugepd_ok(hpd));
 12	return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
 13}
 14
 15static inline unsigned int hugepd_shift(hugepd_t hpd)
 16{
 17	return hpd.pd & HUGEPD_SHIFT_MASK;
 18}
 19
 20static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr,
 21				    unsigned pdshift)
 22{
 23	/*
 24	 * On FSL BookE, we have multiple higher-level table entries that
 25	 * point to the same hugepte.  Just use the first one since they're all
 26	 * identical.  So for that case, idx=0.
 27	 */
 28	unsigned long idx = 0;
 29
 30	pte_t *dir = hugepd_page(*hpdp);
 31#ifndef CONFIG_PPC_FSL_BOOK3E
 32	idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp);
 33#endif
 34
 35	return dir + idx;
 36}
 37
 38pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
 39				 unsigned long addr, unsigned *shift);
 40
 41void flush_dcache_icache_hugepage(struct page *page);
 42
 43#if defined(CONFIG_PPC_MM_SLICES) || defined(CONFIG_PPC_SUBPAGE_PROT)
 44int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
 45			   unsigned long len);
 46#else
 47static inline int is_hugepage_only_range(struct mm_struct *mm,
 48					 unsigned long addr,
 49					 unsigned long len)
 50{
 51	return 0;
 52}
 53#endif
 54
 55void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
 56			    pte_t pte);
 57void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 58
 59void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 60			    unsigned long end, unsigned long floor,
 61			    unsigned long ceiling);
 62
 63/*
 64 * The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs
 65 * to override the version in mm/hugetlb.c
 66 */
 67#define vma_mmu_pagesize vma_mmu_pagesize
 68
 69/*
 70 * If the arch doesn't supply something else, assume that hugepage
 71 * size aligned regions are ok without further preparation.
 72 */
 73static inline int prepare_hugepage_range(struct file *file,
 74			unsigned long addr, unsigned long len)
 75{
 76	struct hstate *h = hstate_file(file);
 77	if (len & ~huge_page_mask(h))
 78		return -EINVAL;
 79	if (addr & ~huge_page_mask(h))
 80		return -EINVAL;
 81	return 0;
 82}
 83
 84static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
 85{
 86}
 87
 88
 89static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 90				   pte_t *ptep, pte_t pte)
 91{
 92	set_pte_at(mm, addr, ptep, pte);
 93}
 94
 95static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 96					    unsigned long addr, pte_t *ptep)
 97{
 98#ifdef CONFIG_PPC64
 99	return __pte(pte_update(mm, addr, ptep, ~0UL, 1));
100#else
101	return __pte(pte_update(ptep, ~0UL, 0));
102#endif
103}
104
105static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
106					 unsigned long addr, pte_t *ptep)
107{
108	pte_t pte;
109	pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
110	flush_tlb_page(vma, addr);
111}
112
113static inline int huge_pte_none(pte_t pte)
114{
115	return pte_none(pte);
116}
117
118static inline pte_t huge_pte_wrprotect(pte_t pte)
119{
120	return pte_wrprotect(pte);
121}
122
123static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
124					     unsigned long addr, pte_t *ptep,
125					     pte_t pte, int dirty)
126{
127#ifdef HUGETLB_NEED_PRELOAD
128	/*
129	 * The "return 1" forces a call of update_mmu_cache, which will write a
130	 * TLB entry.  Without this, platforms that don't do a write of the TLB
131	 * entry in the TLB miss handler asm will fault ad infinitum.
132	 */
133	ptep_set_access_flags(vma, addr, ptep, pte, dirty);
134	return 1;
135#else
136	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
137#endif
138}
139
140static inline pte_t huge_ptep_get(pte_t *ptep)
141{
142	return *ptep;
143}
144
145static inline int arch_prepare_hugepage(struct page *page)
146{
147	return 0;
148}
149
150static inline void arch_release_hugepage(struct page *page)
151{
152}
153
154#else /* ! CONFIG_HUGETLB_PAGE */
155static inline void flush_hugetlb_page(struct vm_area_struct *vma,
156				      unsigned long vmaddr)
157{
158}
159#endif /* CONFIG_HUGETLB_PAGE */
160
161
162/*
163 * FSL Book3E platforms require special gpage handling - the gpages
164 * are reserved early in the boot process by memblock instead of via
165 * the .dts as on IBM platforms.
166 */
167#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_FSL_BOOK3E)
168extern void __init reserve_hugetlb_gpages(void);
169#else
170static inline void reserve_hugetlb_gpages(void)
171{
172}
173#endif
174
175#endif /* _ASM_POWERPC_HUGETLB_H */