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-rw-r--r--arch/parisc/include/asm/pgalloc.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
new file mode 100644
index 0000000000..e3e142b1c5
--- /dev/null
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -0,0 +1,73 @@
+/* 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_TABLE_ORDER);
+ if (unlikely(pgd == NULL))
+ return NULL;
+
+ memset(pgd, 0, PAGE_SIZE << PGD_TABLE_ORDER);
+
+ return pgd;
+}
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+ free_pages((unsigned long)pgd, PGD_TABLE_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_TABLE_ORDER);
+ if (likely(pmd))
+ memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER);
+ return pmd;
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+ free_pages((unsigned long)pmd, PMD_TABLE_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))
+
+#endif