1 files changed, 67 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h
new file mode 100644
index 000000000..7fc0f9126
--- /dev/null
+++ b/arch/xtensa/include/asm/pgalloc.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * include/asm-xtensa/pgalloc.h
+ *
+ * Copyright (C) 2001-2007 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_PGALLOC_H
+#define _XTENSA_PGALLOC_H
+
+#ifdef CONFIG_MMU
+#include <linux/highmem.h>
+#include <linux/slab.h>
+
+#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
+#define __HAVE_ARCH_PTE_ALLOC_ONE
+#include <asm-generic/pgalloc.h>
+
+/*
+ * Allocating and freeing a pmd is trivial: the 1-entry pmd is
+ * inside the pgd, so has no extra memory associated with it.
+ */
+
+#define pmd_populate_kernel(mm, pmdp, ptep)				     \
+	(pmd_val(*(pmdp)) = ((unsigned long)ptep))
+#define pmd_populate(mm, pmdp, page)					     \
+	(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
+
+static inline pgd_t*
+pgd_alloc(struct mm_struct *mm)
+{
+	return (pgd_t*) __get_free_page(GFP_KERNEL | __GFP_ZERO);
+}
+
+static inline void ptes_clear(pte_t *ptep)
+{
+	int i;
+
+	for (i = 0; i < PTRS_PER_PTE; i++)
+		pte_clear(NULL, 0, ptep + i);
+}
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
+{
+	pte_t *ptep;
+
+	ptep = (pte_t *)__pte_alloc_one_kernel(mm);
+	if (!ptep)
+		return NULL;
+	ptes_clear(ptep);
+	return ptep;
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
+{
+	struct page *page;
+
+	page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
+	if (!page)
+		return NULL;
+	ptes_clear(page_address(page));
+	return page;
+}
+
+#endif /* CONFIG_MMU */
+
+#endif /* _XTENSA_PGALLOC_H */