patch-2.3.29 linux/include/asm-ppc/pgalloc.h
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- Lines: 152
- Date:
Mon Nov 22 15:35:37 1999
- Orig file:
v2.3.28/linux/include/asm-ppc/pgalloc.h
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.28/linux/include/asm-ppc/pgalloc.h linux/include/asm-ppc/pgalloc.h
@@ -0,0 +1,151 @@
+#ifndef _PPC_PGALLOC_H
+#define _PPC_PGALLOC_H
+
+
+
+/* We don't use pmd cache, so this is a dummy routine */
+extern __inline__ pmd_t *get_pmd_fast(void)
+{
+ return (pmd_t *)0;
+}
+
+extern __inline__ void free_pmd_fast(pmd_t *pmd)
+{
+}
+
+extern __inline__ void free_pmd_slow(pmd_t *pmd)
+{
+}
+
+/*
+ * allocating and freeing a pmd is trivial: the 1-entry pmd is
+ * inside the pgd, so has no extra memory associated with it.
+ */
+extern inline void pmd_free(pmd_t * pmd)
+{
+}
+
+extern inline pmd_t * pmd_alloc(pgd_t * pgd, unsigned long address)
+{
+ return (pmd_t *) pgd;
+}
+
+#define pmd_free_kernel pmd_free
+#define pmd_alloc_kernel pmd_alloc
+#define pte_alloc_kernel pte_alloc
+
+extern __inline__ pgd_t *get_pgd_slow(void)
+{
+ pgd_t *ret, *init;
+ /*if ( (ret = (pgd_t *)get_zero_page_fast()) == NULL )*/
+ if ( (ret = (pgd_t *)__get_free_page(GFP_KERNEL)) != NULL )
+ memset (ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
+ if (ret) {
+ init = pgd_offset(&init_mm, 0);
+ memcpy (ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+ return ret;
+}
+
+extern __inline__ pgd_t *get_pgd_fast(void)
+{
+ unsigned long *ret;
+
+ if((ret = pgd_quicklist) != NULL) {
+ pgd_quicklist = (unsigned long *)(*ret);
+ ret[0] = ret[1];
+ pgtable_cache_size--;
+ } else
+ ret = (unsigned long *)get_pgd_slow();
+ return (pgd_t *)ret;
+}
+
+extern __inline__ void free_pgd_fast(pgd_t *pgd)
+{
+ *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
+ pgd_quicklist = (unsigned long *) pgd;
+ pgtable_cache_size++;
+}
+
+extern __inline__ void free_pgd_slow(pgd_t *pgd)
+{
+ free_page((unsigned long)pgd);
+}
+
+extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
+
+extern __inline__ pte_t *get_pte_fast(void)
+{
+ unsigned long *ret;
+
+ if((ret = (unsigned long *)pte_quicklist) != NULL) {
+ pte_quicklist = (unsigned long *)(*ret);
+ ret[0] = ret[1];
+ pgtable_cache_size--;
+ }
+ return (pte_t *)ret;
+}
+
+extern __inline__ void free_pte_fast(pte_t *pte)
+{
+ *(unsigned long *)pte = (unsigned long) pte_quicklist;
+ pte_quicklist = (unsigned long *) pte;
+ pgtable_cache_size++;
+}
+
+extern __inline__ void free_pte_slow(pte_t *pte)
+{
+ free_page((unsigned long)pte);
+}
+#define pte_free_kernel(pte) free_pte_fast(pte)
+#define pte_free(pte) free_pte_fast(pte)
+#define pgd_free(pgd) free_pgd_fast(pgd)
+#define pgd_alloc() get_pgd_fast()
+
+extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long address)
+{
+ address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+ if (pmd_none(*pmd)) {
+ pte_t * page = (pte_t *) get_pte_fast();
+
+ if (!page)
+ return get_pte_slow(pmd, address);
+ pmd_val(*pmd) = (unsigned long) page;
+ return page + address;
+ }
+ if (pmd_bad(*pmd)) {
+ __bad_pte(pmd);
+ return NULL;
+ }
+ return (pte_t *) pmd_page(*pmd) + address;
+}
+
+extern int do_check_pgt_cache(int, int);
+
+extern __inline__ pte_t *find_pte(struct mm_struct *mm,unsigned long va)
+{
+ pgd_t *dir;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ va &= PAGE_MASK;
+
+ dir = pgd_offset( mm, va );
+ if (dir)
+ {
+ pmd = pmd_offset(dir, va & PAGE_MASK);
+ if (pmd && pmd_present(*pmd))
+ {
+ pte = pte_offset(pmd, va);
+ if (pte && pte_present(*pte))
+ {
+ pte_uncache(*pte);
+ flush_tlb_page(find_vma(mm,va),va);
+ }
+ }
+ }
+ return pte;
+}
+
+#endif /* _PPC_PGALLOC_H */
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