1 files changed, 136 insertions, 0 deletions

diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
new file mode 100644
index 000000000000..3dcd64bf1824
--- /dev/null
+++ b/arch/arm/include/asm/pgalloc.h
@@ -0,0 +1,136 @@
+/*
+ *  arch/arm/include/asm/pgalloc.h
+ *
+ *  Copyright (C) 2000-2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASMARM_PGALLOC_H
+#define _ASMARM_PGALLOC_H
+
+#include <asm/domain.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+#define check_pgt_cache()               do { } while (0)
+
+#ifdef CONFIG_MMU
+
+#define _PAGE_USER_TABLE        (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
+#define _PAGE_KERNEL_TABLE      (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
+
+/*
+ * Since we have only two-level page tables, these are trivial
+ */
+#define pmd_alloc_one(mm,addr)          ({ BUG(); ((pmd_t *)2); })
+#define pmd_free(mm, pmd)               do { } while (0)
+#define pgd_populate(mm,pmd,pte)        BUG()
+
+extern pgd_t *get_pgd_slow(struct mm_struct *mm);
+extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
+
+#define pgd_alloc(mm)                   get_pgd_slow(mm)
+#define pgd_free(mm, pgd)               free_pgd_slow(mm, pgd)
+
+/*
+ * Allocate one PTE table.
+ *
+ * This actually allocates two hardware PTE tables, but we wrap this up
+ * into one table thus:
+ *
+ *  +------------+
+ *  |  h/w pt 0  |
+ *  +------------+
+ *  |  h/w pt 1  |
+ *  +------------+
+ *  | Linux pt 0 |
+ *  +------------+
+ *  | Linux pt 1 |
+ *  +------------+
+ */
+static inline pte_t *
+pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
+{
+        pte_t *pte;
+
+        pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+        if (pte) {
+                clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE);
+                pte += PTRS_PER_PTE;
+        }
+
+        return pte;
+}
+
+static inline pgtable_t
+pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+        struct page *pte;
+
+        pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+        if (pte) {
+                void *page = page_address(pte);
+                clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
+                pgtable_page_ctor(pte);
+        }
+
+        return pte;
+}
+
+/*
+ * Free one PTE table.
+ */
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+        if (pte) {
+                pte -= PTRS_PER_PTE;
+                free_page((unsigned long)pte);
+        }
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+        pgtable_page_dtor(pte);
+        __free_page(pte);
+}
+
+static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
+{
+        pmdp[0] = __pmd(pmdval);
+        pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
+        flush_pmd_entry(pmdp);
+}
+
+/*
+ * Populate the pmdp entry with a pointer to the pte.  This pmd is part
+ * of the mm address space.
+ *
+ * Ensure that we always set both PMD entries.
+ */
+static inline void
+pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
+{
+        unsigned long pte_ptr = (unsigned long)ptep;
+
+        /*
+         * The pmd must be loaded with the physical
+         * address of the PTE table
+         */
+        pte_ptr -= PTRS_PER_PTE * sizeof(void *);
+        __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
+}
+
+static inline void
+pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
+{
+        __pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
+}
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+#endif /* CONFIG_MMU */
+
+#endif