page_mm.h

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#ifndef _M68K_PAGE_MM_H
#define _M68K_PAGE_MM_H

#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)

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;

#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) ({                       \
    const 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)

#endif /* _M68K_PAGE_MM_H */