1 files changed, 71 insertions, 0 deletions
diff --git a/xenolinux-2.4.25-sparse/include/asm-xeno/pgtable-2level.h b/xenolinux-2.4.25-sparse/include/asm-xeno/pgtable-2level.h
new file mode 100644
index 0000000000..c780f644c0
--- /dev/null
+++ b/xenolinux-2.4.25-sparse/include/asm-xeno/pgtable-2level.h
@@ -0,0 +1,71 @@
+#ifndef _I386_PGTABLE_2LEVEL_H
+#define _I386_PGTABLE_2LEVEL_H
+
+/*
+ * traditional i386 two-level paging structure:
+ */
+
+#define PGDIR_SHIFT	22
+#define PTRS_PER_PGD	1024
+
+/*
+ * the i386 is two-level, so we don't really have any
+ * PMD directory physically.
+ */
+#define PMD_SHIFT	22
+#define PTRS_PER_PMD	1
+
+#define PTRS_PER_PTE	1024
+
+#define pte_ERROR(e) \
+	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)		{ return 0; }
+static inline int pgd_bad(pgd_t pgd)		{ return 0; }
+static inline int pgd_present(pgd_t pgd)	{ return 1; }
+#define pgd_clear(xp)				do { } while (0)
+
+#define set_pte(pteptr, pteval) queue_l1_entry_update(pteptr, (pteval).pte_low)
+#define set_pte_atomic(pteptr, pteval) queue_l1_entry_update(pteptr, (pteval).pte_low)
+#define set_pmd(pmdptr, pmdval) queue_l2_entry_update((pmdptr), (pmdval).pmd)
+#define set_pgd(pgdptr, pgdval) ((void)0)
+
+#define pgd_page(pgd) \
+((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+
+static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
+{
+	return (pmd_t *) dir;
+}
+
+/*
+ * A note on implementation of this atomic 'get-and-clear' operation.
+ * This is actually very simple because XenoLinux can only run on a single
+ * processor. Therefore, we cannot race other processors setting the 'accessed'
+ * or 'dirty' bits on a page-table entry.
+ * Even if pages are shared between domains, that is not a problem because
+ * each domain will have separate page tables, with their own versions of
+ * accessed & dirty state.
+ */
+static inline pte_t ptep_get_and_clear(pte_t *xp)
+{
+    pte_t pte = *xp;
+    queue_l1_entry_update(xp, 0);
+    return pte;
+}
+
+#define pte_same(a, b)		((a).pte_low == (b).pte_low)
+#define pte_page(x)		(mem_map+((unsigned long)((pte_val(x) >> PAGE_SHIFT))))
+#define pte_none(x)		(!(x).pte_low)
+#define __mk_pte(page_nr,pgprot) __pte(((page_nr) << PAGE_SHIFT) | pgprot_val(pgprot))
+
+#endif /* _I386_PGTABLE_2LEVEL_H */