1 files changed, 167 insertions, 0 deletions

diff --git a/include/asm-ia64/pgalloc.h b/include/asm-ia64/pgalloc.h
new file mode 100644
index 000000000000..0f05dc8bd460
--- /dev/null
+++ b/include/asm-ia64/pgalloc.h
@@ -0,0 +1,167 @@
+#ifndef _ASM_IA64_PGALLOC_H
+#define _ASM_IA64_PGALLOC_H
+
+/*
+ * This file contains the functions and defines necessary to allocate
+ * page tables.
+ *
+ * This hopefully works with any (fixed) ia-64 page-size, as defined
+ * in <asm/page.h> (currently 8192).
+ *
+ * Copyright (C) 1998-2001 Hewlett-Packard Co
+ *      David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2000, Goutham Rao <goutham.rao@intel.com>
+ */
+
+#include <linux/config.h>
+
+#include <linux/compiler.h>
+#include <linux/mm.h>
+#include <linux/page-flags.h>
+#include <linux/threads.h>
+
+#include <asm/mmu_context.h>
+
+/*
+ * Very stupidly, we used to get new pgd's and pmd's, init their contents
+ * to point to the NULL versions of the next level page table, later on
+ * completely re-init them the same way, then free them up.  This wasted
+ * a lot of work and caused unnecessary memory traffic.  How broken...
+ * We fix this by caching them.
+ */
+#define pgd_quicklist           (local_cpu_data->pgd_quick)
+#define pmd_quicklist           (local_cpu_data->pmd_quick)
+#define pgtable_cache_size      (local_cpu_data->pgtable_cache_sz)
+
+static inline pgd_t*
+pgd_alloc_one_fast (struct mm_struct *mm)
+{
+        unsigned long *ret = NULL;
+
+        preempt_disable();
+
+        ret = pgd_quicklist;
+        if (likely(ret != NULL)) {
+                pgd_quicklist = (unsigned long *)(*ret);
+                ret[0] = 0;
+                --pgtable_cache_size;
+        } else
+                ret = NULL;
+
+        preempt_enable();
+
+        return (pgd_t *) ret;
+}
+
+static inline pgd_t*
+pgd_alloc (struct mm_struct *mm)
+{
+        /* the VM system never calls pgd_alloc_one_fast(), so we do it here. */
+        pgd_t *pgd = pgd_alloc_one_fast(mm);
+
+        if (unlikely(pgd == NULL)) {
+                pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
+        }
+        return pgd;
+}
+
+static inline void
+pgd_free (pgd_t *pgd)
+{
+        preempt_disable();
+        *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
+        pgd_quicklist = (unsigned long *) pgd;
+        ++pgtable_cache_size;
+        preempt_enable();
+}
+
+static inline void
+pud_populate (struct mm_struct *mm, pud_t *pud_entry, pmd_t *pmd)
+{
+        pud_val(*pud_entry) = __pa(pmd);
+}
+
+static inline pmd_t*
+pmd_alloc_one_fast (struct mm_struct *mm, unsigned long addr)
+{
+        unsigned long *ret = NULL;
+
+        preempt_disable();
+
+        ret = (unsigned long *)pmd_quicklist;
+        if (likely(ret != NULL)) {
+                pmd_quicklist = (unsigned long *)(*ret);
+                ret[0] = 0;
+                --pgtable_cache_size;
+        }
+
+        preempt_enable();
+
+        return (pmd_t *)ret;
+}
+
+static inline pmd_t*
+pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
+{
+        pmd_t *pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+
+        return pmd;
+}
+
+static inline void
+pmd_free (pmd_t *pmd)
+{
+        preempt_disable();
+        *(unsigned long *)pmd = (unsigned long) pmd_quicklist;
+        pmd_quicklist = (unsigned long *) pmd;
+        ++pgtable_cache_size;
+        preempt_enable();
+}
+
+#define __pmd_free_tlb(tlb, pmd)        pmd_free(pmd)
+
+static inline void
+pmd_populate (struct mm_struct *mm, pmd_t *pmd_entry, struct page *pte)
+{
+        pmd_val(*pmd_entry) = page_to_phys(pte);
+}
+
+static inline void
+pmd_populate_kernel (struct mm_struct *mm, pmd_t *pmd_entry, pte_t *pte)
+{
+        pmd_val(*pmd_entry) = __pa(pte);
+}
+
+static inline struct page *
+pte_alloc_one (struct mm_struct *mm, unsigned long addr)
+{
+        struct page *pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+
+        return pte;
+}
+
+static inline pte_t *
+pte_alloc_one_kernel (struct mm_struct *mm, unsigned long addr)
+{
+        pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+
+        return pte;
+}
+
+static inline void
+pte_free (struct page *pte)
+{
+        __free_page(pte);
+}
+
+static inline void
+pte_free_kernel (pte_t *pte)
+{
+        free_page((unsigned long) pte);
+}
+
+#define __pte_free_tlb(tlb, pte)        tlb_remove_page((tlb), (pte))
+
+extern void check_pgt_cache (void);
+
+#endif /* _ASM_IA64_PGALLOC_H */