From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/m32r/include/asm/pgtable-2level.h | 75 ++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 arch/m32r/include/asm/pgtable-2level.h

(limited to 'arch/m32r/include/asm/pgtable-2level.h')

diff --git a/arch/m32r/include/asm/pgtable-2level.h b/arch/m32r/include/asm/pgtable-2level.h
new file mode 100644
index 000000000..421e6ba3a
--- /dev/null
+++ b/arch/m32r/include/asm/pgtable-2level.h
@@ -0,0 +1,75 @@
+#ifndef _ASM_M32R_PGTABLE_2LEVEL_H
+#define _ASM_M32R_PGTABLE_2LEVEL_H
+#ifdef __KERNEL__
+
+/*
+ * traditional M32R two-level paging structure:
+ */
+
+#define PGDIR_SHIFT	22
+#define PTRS_PER_PGD	1024
+
+/*
+ * the M32R is two-level, so we don't really have any
+ * PMD directory physically.
+ */
+#define __PAGETABLE_PMD_FOLDED
+#define PMD_SHIFT	22
+#define PTRS_PER_PMD	1
+
+#define PTRS_PER_PTE	1024
+
+#define pte_ERROR(e) \
+	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)	{ return 0; }
+static inline int pgd_bad(pgd_t pgd)	{ return 0; }
+static inline int pgd_present(pgd_t pgd)	{ return 1; }
+#define pgd_clear(xp)				do { } while (0)
+
+/*
+ * Certain architectures need to do special things when PTEs
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+/*
+ * (pmds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
+#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
+
+#define pgd_page_vaddr(pgd) \
+((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+
+#ifndef CONFIG_DISCONTIGMEM
+#define pgd_page(pgd)	(mem_map + ((pgd_val(pgd) >> PAGE_SHIFT) - PFN_BASE))
+#endif /* !CONFIG_DISCONTIGMEM */
+
+static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
+{
+	return (pmd_t *) dir;
+}
+
+#define ptep_get_and_clear(mm,addr,xp)	__pte(xchg(&(xp)->pte, 0))
+#define pte_same(a, b)		(pte_val(a) == pte_val(b))
+#define pte_page(x)		pfn_to_page(pte_pfn(x))
+#define pte_none(x)		(!pte_val(x))
+#define pte_pfn(x)		(pte_val(x) >> PAGE_SHIFT)
+#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot)	__pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
-- 
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