1 files changed, 144 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h
new file mode 100644
index 000000000..a5b459bcb
--- /dev/null
+++ b/arch/m68k/include/asm/page_mm.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _M68K_PAGE_MM_H
+#define _M68K_PAGE_MM_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/compiler.h>
+#include <asm/module.h>
+
+/*
+ * We don't need to check for alignment etc.
+ */
+#ifdef CPU_M68040_OR_M68060_ONLY
+static inline void copy_page(void *to, void *from)
+{
+  unsigned long tmp;
+
+  __asm__ __volatile__("1:\t"
+		       ".chip 68040\n\t"
+		       "move16 %1@+,%0@+\n\t"
+		       "move16 %1@+,%0@+\n\t"
+		       ".chip 68k\n\t"
+		       "dbra  %2,1b\n\t"
+		       : "=a" (to), "=a" (from), "=d" (tmp)
+		       : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
+		       );
+}
+
+static inline void clear_page(void *page)
+{
+	unsigned long tmp;
+	unsigned long *sp = page;
+
+	*sp++ = 0;
+	*sp++ = 0;
+	*sp++ = 0;
+	*sp++ = 0;
+
+	__asm__ __volatile__("1:\t"
+			     ".chip 68040\n\t"
+			     "move16 %2@+,%0@+\n\t"
+			     ".chip 68k\n\t"
+			     "subqw  #8,%2\n\t"
+			     "subqw  #8,%2\n\t"
+			     "dbra   %1,1b\n\t"
+			     : "=a" (sp), "=d" (tmp)
+			     : "a" (page), "0" (sp),
+			       "1" ((PAGE_SIZE - 16) / 16 - 1));
+}
+
+#else
+#define clear_page(page)	memset((page), 0, PAGE_SIZE)
+#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
+#endif
+
+#define clear_user_page(addr, vaddr, page)	\
+	do {	clear_page(addr);		\
+		flush_dcache_page(page);	\
+	} while (0)
+#define copy_user_page(to, from, vaddr, page)	\
+	do {	copy_page(to, from);		\
+		flush_dcache_page(page);	\
+	} while (0)
+
+extern unsigned long m68k_memoffset;
+
+#ifndef CONFIG_SUN3
+
+#define WANT_PAGE_VIRTUAL
+
+static inline unsigned long ___pa(void *vaddr)
+{
+	unsigned long paddr;
+	asm (
+		"1:	addl #0,%0\n"
+		m68k_fixup(%c2, 1b+2)
+		: "=r" (paddr)
+		: "0" (vaddr), "i" (m68k_fixup_memoffset));
+	return paddr;
+}
+#define __pa(vaddr)	___pa((void *)(long)(vaddr))
+static inline void *__va(unsigned long paddr)
+{
+	void *vaddr;
+	asm (
+		"1:	subl #0,%0\n"
+		m68k_fixup(%c2, 1b+2)
+		: "=r" (vaddr)
+		: "0" (paddr), "i" (m68k_fixup_memoffset));
+	return vaddr;
+}
+
+#else	/* !CONFIG_SUN3 */
+/* This #define is a horrible hack to suppress lots of warnings. --m */
+#define __pa(x) ___pa((unsigned long)(x))
+static inline unsigned long ___pa(unsigned long x)
+{
+     if(x == 0)
+	  return 0;
+     if(x >= PAGE_OFFSET)
+        return (x-PAGE_OFFSET);
+     else
+        return (x+0x2000000);
+}
+
+static inline void *__va(unsigned long x)
+{
+     if(x == 0)
+	  return (void *)0;
+
+     if(x < 0x2000000)
+        return (void *)(x+PAGE_OFFSET);
+     else
+        return (void *)(x-0x2000000);
+}
+#endif	/* CONFIG_SUN3 */
+
+/*
+ * NOTE: virtual isn't really correct, actually it should be the offset into the
+ * memory node, but we have no highmem, so that works for now.
+ * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
+ * of the shifts unnecessary.
+ */
+#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
+
+extern int m68k_virt_to_node_shift;
+
+#define virt_to_page(addr) ({						\
+	pfn_to_page(virt_to_pfn(addr));					\
+})
+#define page_to_virt(page) ({						\
+	pfn_to_virt(page_to_pfn(page));					\
+})
+
+#define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
+#include <asm-generic/memory_model.h>
+
+#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
+#define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _M68K_PAGE_MM_H */