patch-2.4.2 linux/include/asm-cris/pgalloc.h

• Lines: 201
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/include/asm-cris/pgalloc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-cris/pgalloc.h linux/include/asm-cris/pgalloc.h
@@ -0,0 +1,200 @@
+#ifndef _CRIS_PGALLOC_H
+#define _CRIS_PGALLOC_H
+
+#include <linux/config.h>
+#include <asm/page.h>
+#include <linux/threads.h>
+
+/* bunch of protos */
+
+extern pgd_t *get_pgd_slow(void);
+extern void free_pgd_slow(pgd_t *pgd);
+extern __inline__ void free_pmd_slow(pmd_t *pmd) { }
+extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
+extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
+
+/* first the non-cached versions */
+
+extern __inline__ void free_pte_slow(pte_t *pte)
+{
+        free_page((unsigned long)pte);
+}
+
+extern __inline__ pgd_t *get_pgd_slow(void)
+{
+        pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
+
+        if (ret) {
+                memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
+                memcpy(ret + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
+		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+        }
+        return ret;
+}
+
+extern __inline__ void free_pgd_slow(pgd_t *pgd)
+{
+        free_page((unsigned long)pgd);
+}
+
+/*
+ * Now for the page table cache versions
+ */
+
+#ifndef CONFIG_NO_PGT_CACHE
+
+#ifdef CONFIG_SMP
+#error Pgtable caches have to be per-CPU, so that no locking is needed.
+#endif  /* CONFIG_SMP */
+
+extern struct pgtable_cache_struct {
+        unsigned long *pgd_cache;
+        unsigned long *pte_cache;
+        unsigned long pgtable_cache_sz;
+} quicklists;
+
+#define pgd_quicklist           (quicklists.pgd_cache)
+#define pmd_quicklist           ((unsigned long *)0)
+#define pte_quicklist           (quicklists.pte_cache)
+#define pgtable_cache_size      (quicklists.pgtable_cache_sz)
+
+extern __inline__ pgd_t *get_pgd_fast(void)
+{
+        unsigned long *ret;
+
+        if ((ret = pgd_quicklist) != NULL) {
+                pgd_quicklist = (unsigned long *)(*ret);
+                ret[0] = 0;
+                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++;
+}
+
+/* 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__ 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++;
+}
+
+#else   /* CONFIG_NO_PGT_CACHE */
+
+#define pgd_quicklist           ((unsigned long *)0)
+#define pmd_quicklist           ((unsigned long *)0)
+#define pte_quicklist           ((unsigned long *)0)
+
+#define get_pgd_fast()          ((pgd_t *)0)
+#define get_pmd_fast()          ((pmd_t *)0)
+#define get_pte_fast()          ((pte_t *)0)
+
+#define free_pgd_fast(pgd)      free_pgd_slow(pgd)
+#define free_pmd_fast(pmd)      free_pmd_slow(pmd)
+#define free_pte_fast(pte)      free_pte_slow(pte)
+
+#endif  /* CONFIG_NO_PGT_CACHE */
+
+/*
+ * Allocate and free page tables. The xxx_kernel() versions are
+ * used to allocate a kernel page table - this turns on ASN bits
+ * if any.
+ */
+
+#define pte_free_kernel(pte)    free_pte_slow(pte)
+#define pte_free(pte)           free_pte_slow(pte)
+
+extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address)
+{
+        if (!pmd)
+                BUG();
+        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_kernel_slow(pmd, address);
+		pmd_set_kernel(pmd, page);
+                return page + address;
+        }
+        if (pmd_bad(*pmd)) {
+                __handle_bad_pmd_kernel(pmd);
+                return NULL;
+        }
+        return (pte_t *) pmd_page(*pmd) + address;
+}
+
+extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long address)
+{
+        address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+
+        if (pmd_none(*pmd))
+                goto getnew;
+        if (pmd_bad(*pmd))
+                goto fix;
+        return (pte_t *)pmd_page(*pmd) + address;
+ getnew:
+	{
+		pte_t * page = (pte_t *) get_pte_fast();
+		if (!page)
+			return get_pte_slow(pmd, address);
+		pmd_set(pmd, page);
+		return page + address;
+	}
+ fix:
+        __handle_bad_pmd(pmd);
+        return NULL;
+}
+
+/*
+ * allocating and freeing a pmd is trivial: the 1-entry pmd is
+ * inside the pgd, so has no extra memory associated with it.
+ */
+
+#define pmd_free(pmd)      free_pmd_slow(pmd)
+#define pmd_free_kernel    pmd_free
+#define pmd_alloc_kernel   pmd_alloc
+
+extern inline pmd_t * pmd_alloc(pgd_t *pgd, unsigned long address)
+{
+        if (!pgd)
+                BUG();
+        return (pmd_t *) pgd;
+}
+
+/* pgd handling */
+
+#define pgd_free(pgd)      free_pgd_slow(pgd)
+#define pgd_alloc()        get_pgd_fast()
+
+/* other stuff */
+
+extern int do_check_pgt_cache(int, int);
+
+#endif