[S390] Cleanup page table definitions.
- De-confuse the defines for the address-space-control-elements
and the segment/region table entries.
- Create out of line functions for page table allocation / freeing.
- Simplify get_shadow_xxx functions.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
new file mode 100644
index 0000000..e60e0ae
--- /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);
+
+}