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[Xen-devel] what does "See 3B 23.2.1 Table 23-1" mean?



hi,all
when I read xen source code ,I find 



        switch ( vector )
        {
        case TRAP_debug:
            /*
             * Updates DR6 where debugger can peek (See 3B 23.2.1,
             * Table 23-1, "Exit Qualification for Debug Exceptions").
             */
            exit_qualification = __vmread(EXIT_QUALIFICATION);
            write_debugreg(6, exit_qualification | 0xffff0ff0);
            if ( !v->domain->debugger_attached || cpu_has_monitor_trap_flag )
                goto exit_and_crash;
            domain_pause_for_debugger();
            break;


what does  "See 3B 23.2.1 Table 23-1" mean?


--
----------------------------------------------------------
regards,
yandong

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