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pgalloc-64.h

#ifndef _ASM_POWERPC_PGALLOC_64_H
#define _ASM_POWERPC_PGALLOC_64_H
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>

#ifndef CONFIG_PPC_SUBPAGE_PROT
static inline void subpage_prot_free(pgd_t *pgd) {}
#endif

extern struct kmem_cache *pgtable_cache[];

#define PGD_CACHE_NUM         0
#define PUD_CACHE_NUM         1
#define PMD_CACHE_NUM         1
#define HUGEPTE_CACHE_NUM     2
#define PTE_NONCACHE_NUM      7  /* from GFP rather than kmem_cache */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
      return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
      subpage_prot_free(pgd);
      kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
}

#ifndef CONFIG_PPC_64K_PAGES

#define pgd_populate(MM, PGD, PUD)  pgd_set(PGD, PUD)

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
      return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
                        GFP_KERNEL|__GFP_REPEAT);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
      kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
      pud_set(pud, (unsigned long)pmd);
}

#define pmd_populate(mm, pmd, pte_page) \
      pmd_populate_kernel(mm, pmd, page_address(pte_page))
#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
#define pmd_pgtable(pmd) pmd_page(pmd)


#else /* CONFIG_PPC_64K_PAGES */

#define pud_populate(mm, pud, pmd)  pud_set(pud, (unsigned long)pmd)

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
                               pte_t *pte)
{
      pmd_set(pmd, (unsigned long)pte);
}

#define pmd_populate(mm, pmd, pte_page) \
      pmd_populate_kernel(mm, pmd, page_address(pte_page))
#define pmd_pgtable(pmd) pmd_page(pmd)

#endif /* CONFIG_PPC_64K_PAGES */

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
      return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
                        GFP_KERNEL|__GFP_REPEAT);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
      kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
                                unsigned long address)
{
        return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
                              unsigned long address)
{
      struct page *page;
      pte_t *pte;

      pte = pte_alloc_one_kernel(mm, address);
      if (!pte)
            return NULL;
      page = virt_to_page(pte);
      pgtable_page_ctor(page);
      return page;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
      free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
      pgtable_page_dtor(ptepage);
      __free_page(ptepage);
}

#define PGF_CACHENUM_MASK     0x7

typedef struct pgtable_free {
      unsigned long val;
} pgtable_free_t;

static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
                                    unsigned long mask)
{
      BUG_ON(cachenum > PGF_CACHENUM_MASK);

      return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
}

static inline void pgtable_free(pgtable_free_t pgf)
{
      void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
      int cachenum = pgf.val & PGF_CACHENUM_MASK;

      if (cachenum == PTE_NONCACHE_NUM)
            free_page((unsigned long)p);
      else
            kmem_cache_free(pgtable_cache[cachenum], p);
}

extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);

#define __pte_free_tlb(tlb,ptepage) \
do { \
      pgtable_page_dtor(ptepage); \
      pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
            PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
} while (0)
#define __pmd_free_tlb(tlb, pmd)    \
      pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
            PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
#ifndef CONFIG_PPC_64K_PAGES
#define __pud_free_tlb(tlb, pud)    \
      pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
            PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
#endif /* CONFIG_PPC_64K_PAGES */

#define check_pgt_cache()     do { } while (0)

#endif /* _ASM_POWERPC_PGALLOC_64_H */

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