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         * its still-active userspace windows into the userspace window buffer
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         * its still-active userspace windows into the userspace window buffer
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         * and demap the buffer from DTLB.
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         * and demap the buffer from DTLB.
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         */
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         */
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        ASSERT(THREAD->arch.uspace_window_buffer);
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        ASSERT(THREAD->arch.uspace_window_buffer);
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        flushw();   /* force all userspace windows into memory */
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        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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        uintptr_t uw_buf = ALIGN_DOWN((uintptr_t) THREAD->arch.uspace_window_buffer, PAGE_SIZE);
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        if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
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        if (!overlaps(uw_buf, PAGE_SIZE, base, 1<<KERNEL_PAGE_WIDTH)) {
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            /*
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            /*
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             * The buffer is not covered by the 4M locked kernel DTLB entry
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             * The buffer is not covered by the 4M locked kernel DTLB entry
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             * and therefore it was given a dedicated locked DTLB entry.
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             * and therefore it was given a dedicated locked DTLB entry.