1/*-
2 * Copyright (c) 2019 Justin Hibbits
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/param.h>
30#include <sys/types.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33
34#include <vm/vm.h>
35#include <vm/pmap.h>
36
37#include <machine/spr.h>
38#include <machine/trap.h>
39#include "opal.h"
40
41static int
42opal_hmi_handler2(struct trapframe *frame)
43{
44	int64_t flags;
45	int err;
46
47	err = opal_call(OPAL_HANDLE_HMI2, vtophys(&flags));
48
49	/* XXX: At some point, handle the flags outvar. */
50	if (err == OPAL_SUCCESS) {
51		mtspr(SPR_HMER, 0);
52		return (0);
53	}
54
55	printf("HMI handler failed!  OPAL error code: %d\n", err);
56
57	return (-1);
58}
59
60static int
61opal_hmi_handler(struct trapframe *frame)
62{
63	int err;
64
65	err = opal_call(OPAL_HANDLE_HMI);
66
67	if (err == OPAL_SUCCESS) {
68		mtspr(SPR_HMER, 0);
69		return (0);
70	}
71
72	printf("HMI handler failed!  OPAL error code: %d\n", err);
73
74	return (-1);
75}
76
77static void
78opal_setup_hmi(void *data)
79{
80	/* This only works for OPAL, so first make sure we have it. */
81	if (opal_check() != 0)
82		return;
83
84	if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT)
85		hmi_handler = opal_hmi_handler2;
86	else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
87		hmi_handler = opal_hmi_handler;
88	else {
89		printf("Warning: No OPAL HMI handler found.\n");
90		return;
91	}
92
93	if (bootverbose)
94		printf("Installed OPAL HMI handler.\n");
95}
96
97SYSINIT(opal_setup_hmi, SI_SUB_HYPERVISOR, SI_ORDER_ANY, opal_setup_hmi, NULL);
98