diff options
Diffstat (limited to 'arch/m68k/include/asm/mcf_pgalloc.h')
-rw-r--r-- | arch/m68k/include/asm/mcf_pgalloc.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h new file mode 100644 index 000000000..302c5bf67 --- /dev/null +++ b/arch/m68k/include/asm/mcf_pgalloc.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef M68K_MCF_PGALLOC_H +#define M68K_MCF_PGALLOC_H + +#include <asm/tlb.h> +#include <asm/tlbflush.h> + +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) +{ + pagetable_free(virt_to_ptdesc(pte)); +} + +extern const char bad_pmd_string[]; + +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) +{ + struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_ZERO) & + ~__GFP_HIGHMEM, 0); + + if (!ptdesc) + return NULL; + + return ptdesc_address(ptdesc); +} + +extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) +{ + return (pmd_t *) pgd; +} + +#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte)) + +#define pmd_populate_kernel pmd_populate + +static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, + unsigned long address) +{ + struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); + + pagetable_pte_dtor(ptdesc); + pagetable_free(ptdesc); +} + +static inline pgtable_t pte_alloc_one(struct mm_struct *mm) +{ + struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0); + pte_t *pte; + + if (!ptdesc) + return NULL; + if (!pagetable_pte_ctor(ptdesc)) { + pagetable_free(ptdesc); + return NULL; + } + + pte = ptdesc_address(ptdesc); + return pte; +} + +static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable) +{ + struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); + + pagetable_pte_dtor(ptdesc); + pagetable_free(ptdesc); +} + +/* + * In our implementation, each pgd entry contains 1 pmd that is never allocated + * or freed. pgd_present is always 1, so this should never be called. -NL + */ +#define pmd_free(mm, pmd) BUG() + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + pagetable_free(virt_to_ptdesc(pgd)); +} + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *new_pgd; + struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) & + ~__GFP_HIGHMEM, 0); + + if (!ptdesc) + return NULL; + new_pgd = ptdesc_address(ptdesc); + + memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t)); + memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT); + return new_pgd; +} + +#endif /* M68K_MCF_PGALLOC_H */ |