1 files changed, 56 insertions, 0 deletions
diff --git a/kernel/arch/sh/include/asm/pgtable-3level.h b/kernel/arch/sh/include/asm/pgtable-3level.h
new file mode 100644
index 000000000..249a985d9
--- /dev/null
+++ b/kernel/arch/sh/include/asm/pgtable-3level.h
@@ -0,0 +1,56 @@
+#ifndef __ASM_SH_PGTABLE_3LEVEL_H
+#define __ASM_SH_PGTABLE_3LEVEL_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/*
+ * Some cores need a 3-level page table layout, for example when using
+ * 64-bit PTEs and 4K pages.
+ */
+#define PAGETABLE_LEVELS	3
+
+#define PTE_MAGNITUDE		3	/* 64-bit PTEs on SH-X2 TLB */
+
+/* PGD bits */
+#define PGDIR_SHIFT		30
+
+#define PTRS_PER_PGD		4
+#define USER_PTRS_PER_PGD	2
+
+/* PMD bits */
+#define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE-1))
+
+#define PTRS_PER_PMD	((1 << PGDIR_SHIFT) / PMD_SIZE)
+
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
+
+typedef struct { unsigned long long pmd; } pmd_t;
+#define pmd_val(x)	((x).pmd)
+#define __pmd(x)	((pmd_t) { (x) } )
+
+static inline unsigned long pud_page_vaddr(pud_t pud)
+{
+	return pud_val(pud);
+}
+
+#define pmd_index(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
+{
+	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
+}
+
+#define pud_none(x)	(!pud_val(x))
+#define pud_present(x)	(pud_val(x))
+#define pud_clear(xp)	do { set_pud(xp, __pud(0)); } while (0)
+#define	pud_bad(x)	(pud_val(x) & ~PAGE_MASK)
+
+/*
+ * (puds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
+
+#endif /* __ASM_SH_PGTABLE_3LEVEL_H */