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Linux Cross Reference
Linux/include/asm-i386/pgalloc-3level.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 #ifndef _I386_PGALLOC_3LEVEL_H
  2 #define _I386_PGALLOC_3LEVEL_H
  3 
  4 /*
  5  * Intel Physical Address Extension (PAE) Mode - three-level page
  6  * tables on PPro+ CPUs. Page-table allocation routines.
  7  *
  8  * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
  9  */
 10 
 11 extern __inline__ pmd_t *get_pmd_slow(void)
 12 {
 13         pmd_t *ret = (pmd_t *)__get_free_page(GFP_KERNEL);
 14 
 15         if (ret)
 16                 memset(ret, 0, PAGE_SIZE);
 17         return ret;
 18 }
 19 
 20 extern __inline__ pmd_t *get_pmd_fast(void)
 21 {
 22         unsigned long *ret;
 23 
 24         if ((ret = pmd_quicklist) != NULL) {
 25                 pmd_quicklist = (unsigned long *)(*ret);
 26                 ret[0] = 0;
 27                 pgtable_cache_size--;
 28         } else
 29                 ret = (unsigned long *)get_pmd_slow();
 30         return (pmd_t *)ret;
 31 }
 32 
 33 extern __inline__ void free_pmd_fast(pmd_t *pmd)
 34 {
 35         *(unsigned long *)pmd = (unsigned long) pmd_quicklist;
 36         pmd_quicklist = (unsigned long *) pmd;
 37         pgtable_cache_size++;
 38 }
 39 
 40 extern __inline__ void free_pmd_slow(pmd_t *pmd)
 41 {
 42         free_page((unsigned long)pmd);
 43 }
 44 
 45 extern inline pmd_t * pmd_alloc(pgd_t *pgd, unsigned long address)
 46 {
 47         if (!pgd)
 48                 BUG();
 49         address = (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 50         if (pgd_none(*pgd)) {
 51                 pmd_t *page = get_pmd_fast();
 52 
 53                 if (!page)
 54                         page = get_pmd_slow();
 55                 if (page) {
 56                         if (pgd_none(*pgd)) {
 57                                 set_pgd(pgd, __pgd(1 + __pa(page)));
 58                                 __flush_tlb();
 59                                 return page + address;
 60                         } else
 61                                 free_pmd_fast(page);
 62                 } else
 63                         return NULL;
 64         }
 65         return (pmd_t *)pgd_page(*pgd) + address;
 66 }
 67 
 68 #endif /* _I386_PGALLOC_3LEVEL_H */
 69
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