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      1 /*
      2  * Copyright 2013 Red Hat Inc.
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice shall be included in
     12  * all copies or substantial portions of the Software.
     13  *
     14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20  * OTHER DEALINGS IN THE SOFTWARE.
     21  *
     22  * Authors: Ben Skeggs
     23  */
     24 
     25 #ifdef INCLUDE_PROC
     26 process(PROC_IDLE, #idle, #idle_recv)
     27 #endif
     28 
     29 /******************************************************************************
     30  * IDLE data segment
     31  *****************************************************************************/
     32 #ifdef INCLUDE_DATA
     33 #endif
     34 
     35 /******************************************************************************
     36  * IDLE code segment
     37  *****************************************************************************/
     38 #ifdef INCLUDE_CODE
     39 // description
     40 //
     41 // $r15 - current (idle)
     42 // $r14 - message
     43 // $r0  - zero
     44 idle_recv:
     45 	ret
     46 
     47 // description
     48 //
     49 // $r15 - current (idle)
     50 // $r0  - zero
     51 idle:
     52 	// set our "no interrupt has occurred during our execution" flag
     53 	bset $flags $p0
     54 
     55 	// count IDLE invocations for debugging purposes
     56 	nv_iord($r1, NV_PPWR_DSCRATCH(1))
     57 	add b32 $r1 1
     58 	nv_iowr(NV_PPWR_DSCRATCH(1), $r1)
     59 
     60 	// keep looping while there's pending messages for any process
     61 	idle_loop:
     62 	mov $r1 #proc_list_head
     63 	bclr $flags $p2
     64 	idle_proc:
     65 		// process the process' messages until there's none left
     66 		idle_proc_exec:
     67 			push $r1
     68 			mov b32 $r14 $r1
     69 			call(recv)
     70 			pop $r1
     71 			bra not $p1 #idle_proc_next
     72 			bset $flags $p2
     73 			bra #idle_proc_exec
     74 		// next process!
     75 		idle_proc_next:
     76 		add b32 $r1 #proc_size
     77 		cmp b32 $r1 $r15
     78 		bra ne #idle_proc
     79 	bra $p2 #idle_loop
     80 
     81 	// sleep if no interrupts have occurred
     82 	sleep $p0
     83 	bra #idle
     84 #endif
     85