1 files changed, 74 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
new file mode 100644
index 000000000..dda557085
--- /dev/null
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_PGALLOC_H
+#define _ASM_PGALLOC_H
+
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/threads.h>
+#include <asm/processor.h>
+#include <asm/fixmap.h>
+
+#include <asm/cache.h>
+
+#define __HAVE_ARCH_PMD_ALLOC_ONE
+#define __HAVE_ARCH_PMD_FREE
+#define __HAVE_ARCH_PGD_FREE
+#include <asm-generic/pgalloc.h>
+
+/* Allocate the top level pgd (page directory) */
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	pgd_t *pgd;
+
+	pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
+	if (unlikely(pgd == NULL))
+		return NULL;
+
+	memset(pgd, 0, PAGE_SIZE << PGD_ORDER);
+
+	return pgd;
+}
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+	free_pages((unsigned long)pgd, PGD_ORDER);
+}
+
+#if CONFIG_PGTABLE_LEVELS == 3
+
+/* Three Level Page Table Support for pmd's */
+
+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+	set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
+			(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
+}
+
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+	pmd_t *pmd;
+
+	pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_ORDER);
+	if (likely(pmd))
+		memset ((void *)pmd, 0, PAGE_SIZE << PMD_ORDER);
+	return pmd;
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+	free_pages((unsigned long)pmd, PMD_ORDER);
+}
+#endif
+
+static inline void
+pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
+{
+	set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
+		+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
+}
+
+#define pmd_populate(mm, pmd, pte_page) \
+	pmd_populate_kernel(mm, pmd, page_address(pte_page))
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+#endif