/*
* Copyright 2013 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs
*/
#ifdef INCLUDE_PROC
process(PROC_IDLE, #idle, #idle_recv)
#endif
/******************************************************************************
* IDLE data segment
*****************************************************************************/
#ifdef INCLUDE_DATA
#endif
/******************************************************************************
* IDLE code segment
*****************************************************************************/
#ifdef INCLUDE_CODE
// description
//
// $r15 - current (idle)
// $r14 - message
// $r0 - zero
idle_recv:
ret
// description
//
// $r15 - current (idle)
// $r0 - zero
idle:
// set our "no interrupt has occurred during our execution" flag
bset $flags $p0
// count IDLE invocations for debugging purposes
nv_iord($r1, NV_PPWR_DSCRATCH(1))
add b32 $r1 1
nv_iowr(NV_PPWR_DSCRATCH(1), $r1)
// keep looping while there's pending messages for any process
idle_loop:
mov $r1 #proc_list_head
bclr $flags $p2
idle_proc:
// process the process' messages until there's none left
idle_proc_exec:
push $r1
mov b32 $r14 $r1
call(recv)
pop $r1
bra not $p1 #idle_proc_next
bset $flags $p2
bra #idle_proc_exec
// next process!
idle_proc_next:
add b32 $r1 #proc_size
cmp b32 $r1 $r15
bra ne #idle_proc
bra $p2 #idle_loop
// sleep if no interrupts have occurred
sleep $p0
bra #idle
#endif
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