1 files changed, 195 insertions, 0 deletions

diff --git a/include/asm-m68k/page.h b/include/asm-m68k/page.h
new file mode 100644
index 000000000000..99a516709210
--- /dev/null
+++ b/include/asm-m68k/page.h
@@ -0,0 +1,195 @@
+#ifndef _M68K_PAGE_H
+#define _M68K_PAGE_H
+
+#include <linux/config.h>
+
+/* PAGE_SHIFT determines the page size */
+#ifndef CONFIG_SUN3
+#define PAGE_SHIFT      (12)
+#else
+#define PAGE_SHIFT      (13)
+#endif
+#ifdef __ASSEMBLY__
+#define PAGE_SIZE       (1 << PAGE_SHIFT)
+#else
+#define PAGE_SIZE       (1UL << PAGE_SHIFT)
+#endif
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+
+#ifdef __KERNEL__
+
+#include <asm/setup.h>
+
+#if PAGE_SHIFT < 13
+#define THREAD_SIZE (8192)
+#else
+#define THREAD_SIZE PAGE_SIZE
+#endif
+
+#ifndef __ASSEMBLY__
+
+#define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
+#define free_user_page(page, addr)      free_page(addr)
+
+/*
+ * 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)
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pmd[16]; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x)      ((x).pte)
+#define pmd_val(x)      ((&x)->pmd[0])
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define __pte(x)        ((pte_t) { (x) } )
+#define __pmd(x)        ((pmd_t) { (x) } )
+#define __pgd(x)        ((pgd_t) { (x) } )
+#define __pgprot(x)     ((pgprot_t) { (x) } )
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+/* Pure 2^n version of get_order */
+static inline int get_order(unsigned long size)
+{
+        int order;
+
+        size = (size-1) >> (PAGE_SHIFT-1);
+        order = -1;
+        do {
+                size >>= 1;
+                order++;
+        } while (size);
+        return order;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#include <asm/page_offset.h>
+
+#define PAGE_OFFSET             (PAGE_OFFSET_RAW)
+
+#ifndef __ASSEMBLY__
+
+#ifndef CONFIG_SUN3
+
+#define WANT_PAGE_VIRTUAL
+#ifdef CONFIG_SINGLE_MEMORY_CHUNK
+extern unsigned long m68k_memoffset;
+
+#define __pa(vaddr)             ((unsigned long)(vaddr)+m68k_memoffset)
+#define __va(paddr)             ((void *)((unsigned long)(paddr)-m68k_memoffset))
+#else
+#define __pa(vaddr)             virt_to_phys((void *)vaddr)
+#define __va(paddr)             phys_to_virt((unsigned long)paddr)
+#endif
+
+#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)
+
+#define virt_to_page(kaddr)     (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
+#define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+
+#define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
+#define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
+
+#define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
+#define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
+
+#endif /* __ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
+                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#endif /* __KERNEL__ */
+
+#endif /* _M68K_PAGE_H */