1 files changed, 228 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 000000000000..a34b8bad7847
--- /dev/null
+++ b/arch/m68k/include/asm/page_mm.h
@@ -0,0 +1,228 @@
+#ifndef _M68K_PAGE_H
+#define _M68K_PAGE_H
+
+#include <linux/const.h>
+
+/* PAGE_SHIFT determines the page size */
+#ifndef CONFIG_SUN3
+#define PAGE_SHIFT      (12)
+#else
+#define PAGE_SHIFT      (13)
+#endif
+#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+
+#include <asm/setup.h>
+
+#if PAGE_SHIFT < 13
+#define THREAD_SIZE (8192)
+#else
+#define THREAD_SIZE PAGE_SIZE
+#endif
+
+#ifndef __ASSEMBLY__
+
+#include <linux/compiler.h>
+
+#include <asm/module.h>
+
+#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;
+typedef struct page *pgtable_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) } )
+
+#endif /* !__ASSEMBLY__ */
+
+#include <asm/page_offset.h>
+
+#define PAGE_OFFSET             (PAGE_OFFSET_RAW)
+
+#ifndef __ASSEMBLY__
+
+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 *)(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;
+
+#ifdef CONFIG_SINGLE_MEMORY_CHUNK
+#define __virt_to_node(addr)    (&pg_data_map[0])
+#else
+extern struct pglist_data *pg_data_table[];
+
+static inline __attribute_const__ int __virt_to_node_shift(void)
+{
+        int shift;
+
+        asm (
+                "1:     moveq   #0,%0\n"
+                m68k_fixup(%c1, 1b)
+                : "=d" (shift)
+                : "i" (m68k_fixup_vnode_shift));
+        return shift;
+}
+
+#define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
+#endif
+
+#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 pfn_to_page(pfn) ({                                             \
+        unsigned long __pfn = (pfn);                                    \
+        struct pglist_data *pgdat;                                      \
+        pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
+        pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
+})
+#define page_to_pfn(_page) ({                                           \
+        struct page *__p = (_page);                                     \
+        struct pglist_data *pgdat;                                      \
+        pgdat = &pg_data_map[page_to_nid(__p)];                         \
+        ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
+})
+
+#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)
+
+#include <asm-generic/page.h>
+
+#endif /* _M68K_PAGE_H */