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#define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
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#define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
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#define PTE_GET_FRAME_ARCH(p)           ((((__address)(p)->addr_12_31)<<12) | ((__address)(p)->addr_32_51<<32))
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#define PTE_GET_FRAME_ARCH(p)           ((((__address)(p)->addr_12_31)<<12) | ((__address)(p)->addr_32_51<<32))
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#ifndef __ASM__
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#ifndef __ASM__
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/* Page fault error codes. */
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/** When bit on this position is 0, the page fault was caused by a not-present page. */
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#define PFERR_CODE_P            (1<<0)  
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/** When bit on this position is 1, the page fault was caused by a write. */
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#define PFERR_CODE_RW           (1<<1)
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/** When bit on this position is 1, the page fault was caused in user mode. */
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#define PFERR_CODE_US           (1<<2)
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/** When bit on this position is 1, a reserved bit was set in page directory. */
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#define PFERR_CODE_RSVD         (1<<3)
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/** When bit on this position os 1, the page fault was caused during instruction fecth. */
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#define PFERR_CODE_ID       (1<<4)
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/** Page Table Entry. */
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/** Page Table Entry. */
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struct page_specifier {
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struct page_specifier {
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    unsigned present : 1;
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    unsigned present : 1;
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    unsigned writeable : 1;
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    unsigned writeable : 1;
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    unsigned uaccessible : 1;
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    unsigned uaccessible : 1;