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
26process(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
44idle_recv:
45	ret
46
47// description
48//
49// $r15 - current (idle)
50// $r0  - zero
51idle:
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