1 files changed, 302 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
new file mode 100644
index 000000000..48f87a8a8
--- /dev/null
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -0,0 +1,302 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _MCF_PGTABLE_H
+#define _MCF_PGTABLE_H
+
+#include <asm/mcfmmu.h>
+#include <asm/page.h>
+
+/*
+ * MMUDR bits, in proper place. We write these directly into the MMUDR
+ * after masking from the pte.
+ */
+#define CF_PAGE_LOCKED		MMUDR_LK	/* 0x00000002 */
+#define CF_PAGE_EXEC		MMUDR_X		/* 0x00000004 */
+#define CF_PAGE_WRITABLE	MMUDR_W		/* 0x00000008 */
+#define CF_PAGE_READABLE	MMUDR_R		/* 0x00000010 */
+#define CF_PAGE_SYSTEM		MMUDR_SP	/* 0x00000020 */
+#define CF_PAGE_COPYBACK	MMUDR_CM_CCB	/* 0x00000040 */
+#define CF_PAGE_NOCACHE		MMUDR_CM_NCP	/* 0x00000080 */
+
+#define CF_CACHEMASK		(~MMUDR_CM_CCB)
+#define CF_PAGE_MMUDR_MASK	0x000000fe
+
+#define _PAGE_NOCACHE030	CF_PAGE_NOCACHE
+
+/*
+ * MMUTR bits, need shifting down.
+ */
+#define CF_PAGE_MMUTR_MASK	0x00000c00
+#define CF_PAGE_MMUTR_SHIFT	10
+
+#define CF_PAGE_VALID		(MMUTR_V << CF_PAGE_MMUTR_SHIFT)
+#define CF_PAGE_SHARED		(MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
+
+/*
+ * Fake bits, not implemented in CF, will get masked out before
+ * hitting hardware.
+ */
+#define CF_PAGE_DIRTY		0x00000001
+#define CF_PAGE_ACCESSED	0x00001000
+
+#define _PAGE_CACHE040		0x020   /* 68040 cache mode, cachable, copyback */
+#define _PAGE_NOCACHE_S		0x040   /* 68040 no-cache mode, serialized */
+#define _PAGE_NOCACHE		0x060   /* 68040 cache mode, non-serialized */
+#define _PAGE_CACHE040W		0x000   /* 68040 cache mode, cachable, write-through */
+#define _DESCTYPE_MASK		0x003
+#define _CACHEMASK040		(~0x060)
+#define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */
+
+/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE	CF_PAGE_NOCACHE
+
+/*
+ * Externally used page protection values.
+ */
+#define _PAGE_PRESENT	(CF_PAGE_VALID)
+#define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
+#define _PAGE_DIRTY	(CF_PAGE_DIRTY)
+#define _PAGE_READWRITE (CF_PAGE_READABLE \
+				| CF_PAGE_WRITABLE \
+				| CF_PAGE_SYSTEM \
+				| CF_PAGE_SHARED)
+
+/*
+ * Compound page protection values.
+ */
+#define PAGE_NONE	__pgprot(CF_PAGE_VALID \
+				 | CF_PAGE_ACCESSED)
+
+#define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
+				 | CF_PAGE_ACCESSED \
+				 | CF_PAGE_SHARED)
+
+#define PAGE_INIT	__pgprot(CF_PAGE_VALID \
+				 | CF_PAGE_READABLE \
+				 | CF_PAGE_WRITABLE \
+				 | CF_PAGE_EXEC \
+				 | CF_PAGE_SYSTEM)
+
+#define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
+				 | CF_PAGE_ACCESSED \
+				 | CF_PAGE_READABLE \
+				 | CF_PAGE_WRITABLE \
+				 | CF_PAGE_EXEC \
+				 | CF_PAGE_SYSTEM \
+				 | CF_PAGE_SHARED)
+
+#define PAGE_COPY	__pgprot(CF_PAGE_VALID \
+				 | CF_PAGE_ACCESSED \
+				 | CF_PAGE_READABLE \
+				 | CF_PAGE_DIRTY)
+
+#define PTE_MASK	PAGE_MASK
+#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
+
+#ifndef __ASSEMBLY__
+
+#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
+
+/*
+ * 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) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
+	return pte;
+}
+
+#define pmd_set(pmdp, ptep) do {} while (0)
+
+static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
+{
+	pgd_val(*pgdp) = virt_to_phys(pmdp);
+}
+
+#define __pte_page(pte)	((void *) (pte_val(pte) & PAGE_MASK))
+#define pmd_page_vaddr(pmd)	((unsigned long) (pmd_val(pmd)))
+
+static inline int pte_none(pte_t pte)
+{
+	return !pte_val(pte);
+}
+
+static inline int pte_present(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_VALID;
+}
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
+	pte_t *ptep)
+{
+	pte_val(*ptep) = 0;
+}
+
+#define pte_page(pte)	virt_to_page(__pte_page(pte))
+
+static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
+#define pmd_none(pmd) pmd_none2(&(pmd))
+static inline int pmd_bad2(pmd_t *pmd) { return 0; }
+#define pmd_bad(pmd) pmd_bad2(&(pmd))
+#define pmd_present(pmd) (!pmd_none2(&(pmd)))
+static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
+
+#define pte_ERROR(e) \
+	printk(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
+	__FILE__, __LINE__, pte_val(e))
+#define pgd_ERROR(e) \
+	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",	\
+	__FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not...
+ * [we have the full set here even if they don't change from m68k]
+ */
+static inline int pte_read(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_READABLE;
+}
+
+static inline int pte_write(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_WRITABLE;
+}
+
+static inline int pte_exec(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_EXEC;
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_DIRTY;
+}
+
+static inline int pte_young(pte_t pte)
+{
+	return pte_val(pte) & CF_PAGE_ACCESSED;
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_WRITABLE;
+	return pte;
+}
+
+static inline pte_t pte_rdprotect(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_READABLE;
+	return pte;
+}
+
+static inline pte_t pte_exprotect(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_EXEC;
+	return pte;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_DIRTY;
+	return pte;
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_ACCESSED;
+	return pte;
+}
+
+static inline pte_t pte_mkwrite_novma(pte_t pte)
+{
+	pte_val(pte) |= CF_PAGE_WRITABLE;
+	return pte;
+}
+
+static inline pte_t pte_mkread(pte_t pte)
+{
+	pte_val(pte) |= CF_PAGE_READABLE;
+	return pte;
+}
+
+static inline pte_t pte_mkexec(pte_t pte)
+{
+	pte_val(pte) |= CF_PAGE_EXEC;
+	return pte;
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+	pte_val(pte) |= CF_PAGE_DIRTY;
+	return pte;
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+	pte_val(pte) |= CF_PAGE_ACCESSED;
+	return pte;
+}
+
+static inline pte_t pte_mknocache(pte_t pte)
+{
+	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
+	return pte;
+}
+
+static inline pte_t pte_mkcache(pte_t pte)
+{
+	pte_val(pte) &= ~CF_PAGE_NOCACHE;
+	return pte;
+}
+
+#define swapper_pg_dir kernel_pg_dir
+extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
+
+/*
+ * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
+ * are !pte_none() && !pte_present().
+ *
+ * Format of swap PTEs:
+ *
+ *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
+ *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ *   <------------------ offset -------------> 0 0 0 E <-- type --->
+ *
+ *   E is the exclusive marker that is not stored in swap entries.
+ */
+#define __swp_type(x)		((x).val & 0x7f)
+#define __swp_offset(x)		((x).val >> 11)
+#define __swp_entry(typ, off)	((swp_entry_t) { ((typ) & 0x7f) | \
+					(off << 11) })
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)	(__pte((x).val))
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
+	return pte;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
+	return pte;
+}
+
+#define PFN_PTE_SHIFT		PAGE_SHIFT
+#define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
+#define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
+
+#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
+
+#endif	/* !__ASSEMBLY__ */
+#endif	/* _MCF_PGTABLE_H */