1 files changed, 93 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
new file mode 100644
index 000000000..10f5cf444
--- /dev/null
+++ b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H
+#define _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H
+
+#include <asm-generic/pgtable-nop4d.h>
+
+/*
+ * Entries per page directory level.  The PTE level must use a 64b record
+ * for each page table entry.  The PMD and PGD level use a 32b record for
+ * each entry by assuming that each entry is page aligned.
+ */
+#define PTE_INDEX_SIZE  9
+#define PMD_INDEX_SIZE  7
+#define PUD_INDEX_SIZE  9
+#define PGD_INDEX_SIZE  9
+
+#ifndef __ASSEMBLY__
+#define PTE_TABLE_SIZE	(sizeof(pte_t) << PTE_INDEX_SIZE)
+#define PMD_TABLE_SIZE	(sizeof(pmd_t) << PMD_INDEX_SIZE)
+#define PUD_TABLE_SIZE	(sizeof(pud_t) << PUD_INDEX_SIZE)
+#define PGD_TABLE_SIZE	(sizeof(pgd_t) << PGD_INDEX_SIZE)
+#endif	/* __ASSEMBLY__ */
+
+#define PTRS_PER_PTE	(1 << PTE_INDEX_SIZE)
+#define PTRS_PER_PMD	(1 << PMD_INDEX_SIZE)
+#define PTRS_PER_PUD	(1 << PUD_INDEX_SIZE)
+#define PTRS_PER_PGD	(1 << PGD_INDEX_SIZE)
+
+/* PMD_SHIFT determines what a second-level page table entry can map */
+#define PMD_SHIFT	(PAGE_SHIFT + PTE_INDEX_SIZE)
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE-1))
+
+/* PUD_SHIFT determines what a third-level page table entry can map */
+#define PUD_SHIFT	(PMD_SHIFT + PMD_INDEX_SIZE)
+#define PUD_SIZE	(1UL << PUD_SHIFT)
+#define PUD_MASK	(~(PUD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
+#define PGDIR_SHIFT	(PUD_SHIFT + PUD_INDEX_SIZE)
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/* Bits to mask out from a PMD to get to the PTE page */
+#define PMD_MASKED_BITS		0
+/* Bits to mask out from a PUD to get to the PMD page */
+#define PUD_MASKED_BITS		0
+/* Bits to mask out from a P4D to get to the PUD page */
+#define P4D_MASKED_BITS		0
+
+
+/*
+ * 4-level page tables related bits
+ */
+
+#define p4d_none(p4d)		(!p4d_val(p4d))
+#define p4d_bad(p4d)		(p4d_val(p4d) == 0)
+#define p4d_present(p4d)	(p4d_val(p4d) != 0)
+
+#ifndef __ASSEMBLY__
+
+static inline pud_t *p4d_pgtable(p4d_t p4d)
+{
+	return (pud_t *) (p4d_val(p4d) & ~P4D_MASKED_BITS);
+}
+
+static inline void p4d_clear(p4d_t *p4dp)
+{
+	*p4dp = __p4d(0);
+}
+
+static inline pte_t p4d_pte(p4d_t p4d)
+{
+	return __pte(p4d_val(p4d));
+}
+
+static inline p4d_t pte_p4d(pte_t pte)
+{
+	return __p4d(pte_val(pte));
+}
+extern struct page *p4d_page(p4d_t p4d);
+
+#endif /* !__ASSEMBLY__ */
+
+#define pud_ERROR(e) \
+	pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
+
+/*
+ * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() */
+#define remap_4k_pfn(vma, addr, pfn, prot)	\
+	remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
+
+#endif /* _ _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H */