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Rev 1856 Rev 1857
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        /*
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        /*
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         * If this thread executes also in userspace, we have to lock
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         * If this thread executes also in userspace, we have to lock
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         * its userspace window buffer into DTLB.
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         * its userspace window buffer into 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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        uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer;
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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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             */
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             */
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf);
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
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            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
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            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
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        }
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        }
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        /*
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        /*
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         * Write kernel stack address to %g6 and a pointer to the last item
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         * Write kernel stack address to %g6 and a pointer to the last item
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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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        flushw();   /* force all userspace windows into memory */
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        uintptr_t uw_buf = (uintptr_t) THREAD->arch.uspace_window_buffer;
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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.
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             * Demap it.
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             * Demap it.
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             */
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             */
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf);
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            dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, uw_buf);
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        }
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        }
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        /* sample the state of the userspace window buffer */  
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        /* sample the state of the userspace window buffer */  
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        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
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        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
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    }
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    }