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#include <proc/scheduler.h>
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#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <proc/thread.h>
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#include <arch.h>
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#include <arch.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <arch/regdef.h>
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#include <arch/stack.h>
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#include <arch/mm/tlb.h>
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#include <arch/mm/tlb.h>
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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <config.h>
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#include <config.h>
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#include <align.h>
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#include <align.h>
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#include <macros.h>
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#include <macros.h>
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/** Perform sparc64 specific steps before scheduling a thread.
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/** Perform sparc64 specific steps before scheduling a thread.
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 *
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 *
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 * Ensure that thread's kernel stack, as well as userspace window
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 * Ensure that thread's kernel stack, as well as userspace window
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 * buffer for userspace threads, are locked in DTLB.
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 * buffer for userspace threads, are locked in DTLB.
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 * For userspace threads, initialize reserved global registers
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 * in the alternate and interrupt sets.
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 */
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 */
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void before_thread_runs_arch(void)
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void before_thread_runs_arch(void)
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{
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{
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    uintptr_t base;
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    uintptr_t base;
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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, (uintptr_t) 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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         * Write kernel stack address to %g6 and a pointer to the last item
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         * in the userspace window buffer to %g7 in the alternate and interrupt sets.
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         */
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        write_to_ig_g6((uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS);
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        write_to_ag_g6((uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS);
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        write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
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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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             * 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, (uintptr_t) 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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        THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
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    }
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    }
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}
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}
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/** @}
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/** @}
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 */
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 */