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#define PAGESIZE_8K 0
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#define PAGESIZE_8K 0
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#define PAGESIZE_64K    1
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#define PAGESIZE_64K    1
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#define PAGESIZE_512K   2
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#define PAGESIZE_512K   2
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#define PAGESIZE_4M 3
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#define PAGESIZE_4M 3
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/** Bit width of the TLB-locked portion of kernel address space. */
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#define KERNEL_PAGE_WIDTH       22  /* 4M */
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union tlb_context_reg {
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union tlb_context_reg {
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    __u64 v;
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    __u64 v;
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    struct {
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    struct {
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        unsigned long : 51;
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        unsigned long : 51;
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        unsigned context : 13;      /**< Context/ASID. */
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        unsigned context : 13;      /**< Context/ASID. */