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#include <arch.h>
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#include <arch.h>
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#include <arch/mm/tlb.h>
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#include <arch/mm/tlb.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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/** Ensure that thread's kernel stack is locked in TLB. */
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/** Record kernel stack address in ar.k7 and make sure it is mapped in DTR. */
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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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    __address base;
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    __address base;
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    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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    base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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    if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
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    if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
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        /*
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        /*
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         * Kernel stack of this thread is not locked in DTLB.
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         * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
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         * First, make sure it is not mapped already.
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         * Use DTR[TR_KSTACK] to map it.
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         * If not, fill respective tranlsation register.
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         */
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         */
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         dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK);
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         dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK);
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    }
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    }
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    /*
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     * Record address of kernel stack to ar.k7
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     * where it will be found after switch
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     * from userspace.
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     */
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    __asm__ volatile ("mov ar.k7 = %0\n" : : "r" (THREAD->kstack));
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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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}
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}