In resume() within swtch.s there is a temporarily switch to the 'idle thread',
even when the actual context switch goes from one real thread to another.
163 !
164 ! Temporarily switch to idle thread's stack
165 !
166 ldn [%i1 + CPU_IDLE_THREAD], %o0 ! idle thread pointer
167 ldn [%o0 + T_SP], %o1 ! get onto idle thread
stack
168 sub %o1, SA(MINFRAME), %sp ! save room for ins and
locals
169 clr %fp
170
171 !
172 ! Set the idle thread as the current thread
173 !
174 mov THREAD_REG, %l3 ! save %g7 (current
thread)
175 mov %o0, THREAD_REG ! set %g7 to idle
176 stn %o0, [%i1 + CPU_THREAD] ! set CPU's thread to
idle
Is this a real switch to the idle thread, I mean, is the idle_enter() function
called in disp.c ?
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