1 files changed, 95 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
new file mode 100644
index 000000000..bc1228e00
--- /dev/null
+++ b/arch/m68k/include/asm/mcf_pgalloc.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef M68K_MCF_PGALLOC_H
+#define M68K_MCF_PGALLOC_H
+
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+	free_page((unsigned long) pte);
+}
+
+extern const char bad_pmd_string[];
+
+extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
+{
+	unsigned long page = __get_free_page(GFP_DMA);
+
+	if (!page)
+		return NULL;
+
+	memset((void *)page, 0, PAGE_SIZE);
+	return (pte_t *) (page);
+}
+
+extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
+{
+	return (pmd_t *) pgd;
+}
+
+#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
+
+#define pmd_populate_kernel pmd_populate
+
+#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
+				  unsigned long address)
+{
+	struct page *page = virt_to_page(pgtable);
+
+	pgtable_pte_page_dtor(page);
+	__free_page(page);
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
+{
+	struct page *page = alloc_pages(GFP_DMA, 0);
+	pte_t *pte;
+
+	if (!page)
+		return NULL;
+	if (!pgtable_pte_page_ctor(page)) {
+		__free_page(page);
+		return NULL;
+	}
+
+	pte = page_address(page);
+	clear_page(pte);
+
+	return pte;
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
+{
+	struct page *page = virt_to_page(pgtable);
+
+	pgtable_pte_page_dtor(page);
+	__free_page(page);
+}
+
+/*
+ * In our implementation, each pgd entry contains 1 pmd that is never allocated
+ * or freed.  pgd_present is always 1, so this should never be called. -NL
+ */
+#define pmd_free(mm, pmd) BUG()
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+	free_page((unsigned long) pgd);
+}
+
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	pgd_t *new_pgd;
+
+	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
+	if (!new_pgd)
+		return NULL;
+	memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
+	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
+	return new_pgd;
+}
+
+#endif /* M68K_MCF_PGALLOC_H */