1 files changed, 94 insertions, 0 deletions

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
new file mode 100644
index 000000000000..e60e0ae13402
--- /dev/null
+++ b/arch/s390/mm/pgtable.c
@@ -0,0 +1,94 @@
+/*
+ *  arch/s390/mm/pgtable.c
+ *
+ *    Copyright IBM Corp. 2007
+ *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/quicklist.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+#ifndef CONFIG_64BIT
+#define ALLOC_ORDER     1
+#else
+#define ALLOC_ORDER     2
+#endif
+
+unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
+{
+        struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
+
+        if (!page)
+                return NULL;
+        page->index = 0;
+        if (noexec) {
+                struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
+                if (!shadow) {
+                        __free_pages(page, ALLOC_ORDER);
+                        return NULL;
+                }
+                page->index = page_to_phys(shadow);
+        }
+        return (unsigned long *) page_to_phys(page);
+}
+
+void crst_table_free(unsigned long *table)
+{
+        unsigned long *shadow = get_shadow_table(table);
+
+        if (shadow)
+                free_pages((unsigned long) shadow, ALLOC_ORDER);
+        free_pages((unsigned long) table, ALLOC_ORDER);
+}
+
+/*
+ * page table entry allocation/free routines.
+ */
+unsigned long *page_table_alloc(int noexec)
+{
+        struct page *page = alloc_page(GFP_KERNEL);
+        unsigned long *table;
+
+        if (!page)
+                return NULL;
+        page->index = 0;
+        if (noexec) {
+                struct page *shadow = alloc_page(GFP_KERNEL);
+                if (!shadow) {
+                        __free_page(page);
+                        return NULL;
+                }
+                table = (unsigned long *) page_to_phys(shadow);
+                clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
+                page->index = (addr_t) table;
+        }
+        table = (unsigned long *) page_to_phys(page);
+        clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
+        return table;
+}
+
+void page_table_free(unsigned long *table)
+{
+        unsigned long *shadow = get_shadow_pte(table);
+
+        if (shadow)
+                free_page((unsigned long) shadow);
+        free_page((unsigned long) table);
+
+}