1 files changed, 206 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
new file mode 100644
index 000000000..956c80874
--- /dev/null
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _MOTOROLA_PGTABLE_H
+#define _MOTOROLA_PGTABLE_H
+
+
+/*
+ * Definitions for MMU descriptors
+ */
+#define _PAGE_PRESENT	0x001
+#define _PAGE_SHORT	0x002
+#define _PAGE_RONLY	0x004
+#define _PAGE_READWRITE	0x000
+#define _PAGE_ACCESSED	0x008
+#define _PAGE_DIRTY	0x010
+#define _PAGE_SUPER	0x080	/* 68040 supervisor only */
+#define _PAGE_GLOBAL040	0x400	/* 68040 global bit, used for kva descs */
+#define _PAGE_NOCACHE030 0x040	/* 68030 no-cache mode */
+#define _PAGE_NOCACHE	0x060	/* 68040 cache mode, non-serialized */
+#define _PAGE_NOCACHE_S	0x040	/* 68040 no-cache mode, serialized */
+#define _PAGE_CACHE040	0x020	/* 68040 cache mode, cachable, copyback */
+#define _PAGE_CACHE040W	0x000	/* 68040 cache mode, cachable, write-through */
+
+#define _DESCTYPE_MASK	0x003
+
+#define _CACHEMASK040	(~0x060)
+
+/*
+ * Currently set to the minimum alignment of table pointers (256 bytes).
+ * The hardware only uses the low 4 bits for state:
+ *
+ *    3 - Used
+ *    2 - Write Protected
+ *  0,1 - Descriptor Type
+ *
+ * and has the rest of the bits reserved.
+ */
+#define _TABLE_MASK	(0xffffff00)
+
+#define _PAGE_TABLE	(_PAGE_SHORT)
+#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
+
+#define _PAGE_PROTNONE	0x004
+
+#ifndef __ASSEMBLY__
+
+/* This is the cache mode to be used for pages containing page descriptors for
+ * processors >= '040. It is in pte_mknocache(), and the variable is defined
+ * and initialized in head.S */
+extern int m68k_pgtable_cachemode;
+
+/* This is the cache mode for normal pages, for supervisor access on
+ * processors >= '040. It is used in pte_mkcache(), and the variable is
+ * defined and initialized in head.S */
+
+#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
+#define m68k_supervisor_cachemode _PAGE_CACHE040W
+#elif defined(CPU_M68040_OR_M68060_ONLY)
+#define m68k_supervisor_cachemode _PAGE_CACHE040
+#elif defined(CPU_M68020_OR_M68030_ONLY)
+#define m68k_supervisor_cachemode 0
+#else
+extern int m68k_supervisor_cachemode;
+#endif
+
+#if defined(CPU_M68040_OR_M68060_ONLY)
+#define mm_cachebits _PAGE_CACHE040
+#elif defined(CPU_M68020_OR_M68030_ONLY)
+#define mm_cachebits 0
+#else
+extern unsigned long mm_cachebits;
+#endif
+
+#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
+
+/* Alternate definitions that are compile time constants, for
+   initializing protection_map.  The cachebits are fixed later.  */
+#define PAGE_NONE_C	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED_C	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
+#define PAGE_COPY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
+#define PAGE_READONLY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
+
+/*
+ * The m68k can't do page protection for execute, and considers that the same are read.
+ * Also, write permissions imply read permissions. This is the closest we can get..
+ */
+#define __P000	PAGE_NONE_C
+#define __P001	PAGE_READONLY_C
+#define __P010	PAGE_COPY_C
+#define __P011	PAGE_COPY_C
+#define __P100	PAGE_READONLY_C
+#define __P101	PAGE_READONLY_C
+#define __P110	PAGE_COPY_C
+#define __P111	PAGE_COPY_C
+
+#define __S000	PAGE_NONE_C
+#define __S001	PAGE_READONLY_C
+#define __S010	PAGE_SHARED_C
+#define __S011	PAGE_SHARED_C
+#define __S100	PAGE_READONLY_C
+#define __S101	PAGE_READONLY_C
+#define __S110	PAGE_SHARED_C
+#define __S111	PAGE_SHARED_C
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+	pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
+	return pte;
+}
+
+static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
+{
+	pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
+}
+
+static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
+{
+	pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
+}
+
+#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
+#define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
+#define pud_pgtable(pud) ((pmd_t *)__va(pud_val(pud) & _TABLE_MASK))
+
+
+#define pte_none(pte)		(!pte_val(pte))
+#define pte_present(pte)	(pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,ptep)		({ pte_val(*(ptep)) = 0; })
+
+#define pte_page(pte)		virt_to_page(__va(pte_val(pte)))
+#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
+#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#define pmd_none(pmd)		(!pmd_val(pmd))
+#define pmd_bad(pmd)		((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
+#define pmd_present(pmd)	(pmd_val(pmd) & _PAGE_TABLE)
+#define pmd_clear(pmdp)		({ pmd_val(*pmdp) = 0; })
+
+/*
+ * m68k does not have huge pages (020/030 actually could), but generic code
+ * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to
+ * make the compiler happy.
+ */
+#define pmd_page(pmd)		NULL
+
+
+#define pud_none(pud)		(!pud_val(pud))
+#define pud_bad(pud)		((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
+#define pud_present(pud)	(pud_val(pud) & _PAGE_TABLE)
+#define pud_clear(pudp)		({ pud_val(*pudp) = 0; })
+#define pud_page(pud)		(mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
+
+#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 following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_RONLY); }
+static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
+static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
+
+static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_RONLY; return pte; }
+static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
+static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_RONLY; return pte; }
+static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
+static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mknocache(pte_t pte)
+{
+	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
+	return pte;
+}
+static inline pte_t pte_mkcache(pte_t pte)
+{
+	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
+	return pte;
+}
+
+#define swapper_pg_dir kernel_pg_dir
+extern pgd_t kernel_pg_dir[128];
+
+/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
+#define __swp_type(x)		(((x).val >> 4) & 0xff)
+#define __swp_offset(x)		((x).val >> 12)
+#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
+
+#endif	/* !__ASSEMBLY__ */
+#endif /* _MOTOROLA_PGTABLE_H */