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-rw-r--r--arch/m68k/include/asm/page_mm.h144
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 */