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Rev 830 Rev 846
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    immu_disable();
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    immu_disable();
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    dmmu_disable();
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    dmmu_disable();
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    /*
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    /*
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     * For simplicity, we do identity mapping of first 4M of memory.
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     * We do identity mapping of 4M-page at 4M.
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     * The very next change should be leaving the first 4M unmapped.
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     */
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     */
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    tag.value = 0;
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    tag.value = 0;
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    tag.vpn = pg.vpn;
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    tag.vpn = pg.vpn;
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    itlb_tag_access_write(tag.value);
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    itlb_tag_access_write(tag.value);