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Rev 4055 Rev 4156
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    d->offset_16_31 = offset >> 16;
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    d->offset_16_31 = offset >> 16;
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}
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}
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void tss_initialize(tss_t *t)
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void tss_initialize(tss_t *t)
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{
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{
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    memsetb(t, sizeof(struct tss), 0);
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    memsetb(t, sizeof(tss_t), 0);
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}
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}
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/*
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/*
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 * This function takes care of proper setup of IDT and IDTR.
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 * This function takes care of proper setup of IDT and IDTR.
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 */
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 */
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    for (i = 0; i < IDT_ITEMS; i++) {
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    for (i = 0; i < IDT_ITEMS; i++) {
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        d = &idt[i];
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        d = &idt[i];
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        d->unused = 0;
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        d->unused = 0;
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        d->selector = selector(KTEXT_DES);
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        d->selector = gdtselector(KTEXT_DES);
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        d->access = AR_PRESENT | AR_INTERRUPT;  /* masking interrupt */
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        d->access = AR_PRESENT | AR_INTERRUPT;  /* masking interrupt */
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        if (i == VECTOR_SYSCALL) {
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        if (i == VECTOR_SYSCALL) {
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            /*
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            /*
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    /*
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    /*
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     * As of this moment, the current CPU has its own GDT pointing
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     * As of this moment, the current CPU has its own GDT pointing
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     * to its own TSS. We just need to load the TR register.
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     * to its own TSS. We just need to load the TR register.
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     */
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     */
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    tr_load(selector(TSS_DES));
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    tr_load(gdtselector(TSS_DES));
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    clean_IOPL_NT_flags();    /* Disable I/O on nonprivileged levels and clear NT flag. */
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    clean_IOPL_NT_flags();    /* Disable I/O on nonprivileged levels and clear NT flag. */
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    clean_AM_flag();          /* Disable alignment check */
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    clean_AM_flag();          /* Disable alignment check */
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}
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}
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