140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#ifndef _X86_64_PGALLOC_H
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#define _X86_64_PGALLOC_H
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#include <asm/fixmap.h>
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#include <asm/pda.h>
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#include <linux/threads.h>
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#include <linux/mm.h>
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#define arch_add_exec_range(mm, limit) \
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do { (void)(mm), (void)(limit); } while (0)
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#define arch_flush_exec_range(mm) \
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do { (void)(mm); } while (0)
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#define arch_remove_exec_range(mm, limit) \
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do { (void)(mm), (void)(limit); } while (0)
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#define pmd_populate_kernel(mm, pmd, pte) \
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set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
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#define pud_populate(mm, pud, pmd) \
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set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
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#define pgd_populate(mm, pgd, pud) \
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set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
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{
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set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
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}
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static inline pmd_t *get_pmd(void)
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{
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return (pmd_t *)get_zeroed_page(GFP_KERNEL);
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}
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static inline void pmd_free(pmd_t *pmd)
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{
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BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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free_page((unsigned long)pmd);
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}
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static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
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{
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return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
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}
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
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}
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static inline void pud_free (pud_t *pud)
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{
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BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
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free_page((unsigned long)pud);
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}
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static inline void pgd_list_add(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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spin_lock(&pgd_lock);
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page->index = (pgoff_t)pgd_list;
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if (pgd_list)
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pgd_list->private = (unsigned long)&page->index;
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pgd_list = page;
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page->private = (unsigned long)&pgd_list;
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spin_unlock(&pgd_lock);
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}
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static inline void pgd_list_del(pgd_t *pgd)
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{
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struct page *next, **pprev, *page = virt_to_page(pgd);
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spin_lock(&pgd_lock);
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next = (struct page *)page->index;
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pprev = (struct page **)page->private;
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*pprev = next;
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if (next)
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next->private = (unsigned long)pprev;
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spin_unlock(&pgd_lock);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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unsigned boundary;
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pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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if (!pgd)
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return NULL;
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pgd_list_add(pgd);
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/*
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* Copy kernel pointers in from init.
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* Could keep a freelist or slab cache of those because the kernel
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* part never changes.
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*/
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boundary = pgd_index(__PAGE_OFFSET);
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memset(pgd, 0, boundary * sizeof(pgd_t));
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memcpy(pgd + boundary,
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init_level4_pgt + boundary,
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(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
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return pgd;
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
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pgd_list_del(pgd);
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free_page((unsigned long)pgd);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
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if (!p)
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return NULL;
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return virt_to_page(p);
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}
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/* Should really implement gc for free page table pages. This could be
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done with a reference count in struct page. */
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static inline void pte_free_kernel(pte_t *pte)
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{
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BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
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free_page((unsigned long)pte);
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}
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static inline void pte_free(struct page *pte)
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{
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__free_page(pte);
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}
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#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
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#define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
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#endif /* _X86_64_PGALLOC_H */
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