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Line 861... Line 861...
861 
 * scheduling. Sleeping here would lead to deadlock on wakeup.
 861 
 * scheduling. Sleeping here would lead to deadlock on wakeup.
862 
 *
 862 
 *
863 
 * @param old Old address space or NULL.
 863 
 * @param old Old address space or NULL.
864 
 * @param new New address space.
 864 
 * @param new New address space.
865 
 */
 865 
 */
866 
void as_switch(as_t *old, as_t *new)
 866 
void as_switch(as_t *old, as_t *replace)
867 
{
 867 
{
868 
    ipl_t ipl;
 868 
    ipl_t ipl;
869 
    bool needs_asid = false;
 869 
    bool needs_asid = false;
870 
   
 870 
   
871 
    ipl = interrupts_disable();
 871 
    ipl = interrupts_disable();
Line 898... Line 898...
898 
    }
 898 
    }
899 
 
 899 
 
900 
    /*
 900 
    /*
901 
     * Second, prepare the new address space.
 901 
     * Second, prepare the new address space.
902 
     */
 902 
     */
903 
    mutex_lock_active(&new->lock);
 903 
    mutex_lock_active(&replace->lock);
904 
    if ((new->cpu_refcount++ == 0) && (new != AS_KERNEL)) {
 904 
    if ((replace->cpu_refcount++ == 0) && (replace != AS_KERNEL)) {
905 
        if (new->asid != ASID_INVALID) {
 905 
        if (replace->asid != ASID_INVALID) {
906 
            list_remove(&new->inactive_as_with_asid_link);
 906 
            list_remove(&replace->inactive_as_with_asid_link);
907 
        } else {
 907 
        } else {
908 
            /*
 908 
            /*
909 
             * Defer call to asid_get() until new->lock is released.
 909 
             * Defer call to asid_get() until replace->lock is released.
910 
             */
 910 
             */
911 
            needs_asid = true;
 911 
            needs_asid = true;
912 
        }
 912 
        }
913 
    }
 913 
    }
914 
    SET_PTL0_ADDRESS(new->page_table);
 914 
    SET_PTL0_ADDRESS(replace->page_table);
915 
    mutex_unlock(&new->lock);
 915 
    mutex_unlock(&replace->lock);
916 
 
 916 
 
917 
    if (needs_asid) {
 917 
    if (needs_asid) {
918 
        /*
 918 
        /*
919 
         * Allocation of new ASID was deferred
 919 
         * Allocation of new ASID was deferred
920 
         * until now in order to avoid deadlock.
 920 
         * until now in order to avoid deadlock.
921 
         */
 921 
         */
922 
        asid_t asid;
 922 
        asid_t asid;
923 
       
 923 
       
924 
        asid = asid_get();
 924 
        asid = asid_get();
925 
        mutex_lock_active(&new->lock);
 925 
        mutex_lock_active(&replace->lock);
926 
        new->asid = asid;
 926 
        replace->asid = asid;
927 
        mutex_unlock(&new->lock);
 927 
        mutex_unlock(&replace->lock);
928 
    }
 928 
    }
929 
    spinlock_unlock(&inactive_as_with_asid_lock);
 929 
    spinlock_unlock(&inactive_as_with_asid_lock);
930 
    interrupts_restore(ipl);
 930 
    interrupts_restore(ipl);
931 
   
 931 
   
932 
    /*
 932 
    /*
933 
     * Perform architecture-specific steps.
 933 
     * Perform architecture-specific steps.
934 
     * (e.g. write ASID to hardware register etc.)
 934 
     * (e.g. write ASID to hardware register etc.)
935 
     */
 935 
     */
936 
    as_install_arch(new);
 936 
    as_install_arch(replace);
937 
   
 937 
   
938 
    AS = new;
 938 
    AS = replace;
939 
}
 939 
}
940 
 
 940 
 
941 
/** Convert address space area flags to page flags.
 941 
/** Convert address space area flags to page flags.
942 
 *
 942 
 *
943 
 * @param aflags Flags of some address space area.
 943 
 * @param aflags Flags of some address space area.