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            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
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            dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K,
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                true, true);
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                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
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         * Write kernel stack address to %g6 of the alternate and
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         * interrupt global sets.
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         *
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         * Write pointer to the last item in the userspace window buffer
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         * item in the userspace window buffer to %g7 in the alternate
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         * to %g7 in the alternate set. Write to the interrupt %g7 is
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         * and interrupt sets.
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         * not necessary because:
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         * - spill traps operate only in the alternate global set,
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         * - preemptible trap handler switches to alternate globals
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         *   before it explicitly uses %g7.
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         */
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         */
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
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        uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE
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            - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
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            - (STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE,
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            STACK_ALIGNMENT));
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            STACK_ALIGNMENT));
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        write_to_ig_g6(sp);
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        write_to_ig_g6(sp);
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    }
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    }
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}
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}
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/** Perform sparc64 specific steps before a thread stops running.
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/** Perform sparc64 specific steps before a thread stops running.
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 *
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 *
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 * Demap any locked DTLB entries isntalled by the thread (i.e. kernel stack
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 * Demap any locked DTLB entries installed by the thread (i.e. kernel stack
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 * and userspace window buffer).
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 * and userspace window buffer).
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 */
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 */
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void after_thread_ran_arch(void)
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void after_thread_ran_arch(void)
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{
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{
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    uintptr_t base;
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    uintptr_t base;