summaryrefslogtreecommitdiffstats
path: root/drivers/s390/char/sclp_early.c
blob: 8332788681c402209fb2e7bc202d2a4b9ae8e04a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
// SPDX-License-Identifier: GPL-2.0
/*
 * SCLP early driver
 *
 * Copyright IBM Corp. 2013
 */

#define KMSG_COMPONENT "sclp_early"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/errno.h>
#include <asm/ctl_reg.h>
#include <asm/sclp.h>
#include <asm/ipl.h>
#include "sclp_sdias.h"
#include "sclp.h"

static struct sclp_ipl_info sclp_ipl_info;

struct sclp_info sclp;
EXPORT_SYMBOL(sclp);

static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
{
	struct sclp_core_entry *cpue;
	u16 boot_cpu_address, cpu;

	if (sclp_early_get_info(sccb))
		return;

	sclp.facilities = sccb->facilities;
	sclp.has_sprp = !!(sccb->fac84 & 0x02);
	sclp.has_core_type = !!(sccb->fac84 & 0x01);
	sclp.has_gsls = !!(sccb->fac85 & 0x80);
	sclp.has_64bscao = !!(sccb->fac116 & 0x80);
	sclp.has_cmma = !!(sccb->fac116 & 0x40);
	sclp.has_esca = !!(sccb->fac116 & 0x08);
	sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
	sclp.has_ibs = !!(sccb->fac117 & 0x20);
	sclp.has_gisaf = !!(sccb->fac118 & 0x08);
	sclp.has_hvs = !!(sccb->fac119 & 0x80);
	sclp.has_kss = !!(sccb->fac98 & 0x01);
	if (sccb->fac85 & 0x02)
		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
	if (sccb->fac91 & 0x40)
		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
	if (sccb->cpuoff > 134)
		sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	sclp.rzm <<= 20;
	sclp.ibc = sccb->ibc;

	if (sccb->hamaxpow && sccb->hamaxpow < 64)
		sclp.hamax = (1UL << sccb->hamaxpow) - 1;
	else
		sclp.hamax = U64_MAX;

	if (!sccb->hcpua) {
		if (MACHINE_IS_VM)
			sclp.max_cores = 64;
		else
			sclp.max_cores = sccb->ncpurl;
	} else {
		sclp.max_cores = sccb->hcpua + 1;
	}

	boot_cpu_address = stap();
	cpue = (void *)sccb + sccb->cpuoff;
	for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
		if (boot_cpu_address != cpue->core_id)
			continue;
		sclp.has_siif = cpue->siif;
		sclp.has_sigpif = cpue->sigpif;
		sclp.has_sief2 = cpue->sief2;
		sclp.has_gpere = cpue->gpere;
		sclp.has_ib = cpue->ib;
		sclp.has_cei = cpue->cei;
		sclp.has_skey = cpue->skey;
		break;
	}

	/* Save IPL information */
	sclp_ipl_info.is_valid = 1;
	if (sccb->fac91 & 0x2)
		sclp_ipl_info.has_dump = 1;
	memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);

	if (sccb->hsa_size)
		sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
	sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
	sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;

	sclp.hmfai = sccb->hmfai;
}

/*
 * This function will be called after sclp_early_facilities_detect(), which gets
 * called from early.c code. The sclp_early_facilities_detect() function retrieves
 * and saves the IPL information.
 */
void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
{
	*info = sclp_ipl_info;
}

static struct sclp_core_info sclp_early_core_info __initdata;
static int sclp_early_core_info_valid __initdata;

static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
{
	if (!SCLP_HAS_CPU_INFO)
		return;
	memset(sccb, 0, sizeof(*sccb));
	sccb->header.length = sizeof(*sccb);
	if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
		return;
	if (sccb->header.response_code != 0x0010)
		return;
	sclp_fill_core_info(&sclp_early_core_info, sccb);
	sclp_early_core_info_valid = 1;
}

int __init sclp_early_get_core_info(struct sclp_core_info *info)
{
	if (!sclp_early_core_info_valid)
		return -EIO;
	*info = sclp_early_core_info;
	return 0;
}

static void __init sclp_early_console_detect(struct init_sccb *sccb)
{
	if (sccb->header.response_code != 0x20)
		return;

	if (sclp_early_con_check_vt220(sccb))
		sclp.has_vt220 = 1;

	if (sclp_early_con_check_linemode(sccb))
		sclp.has_linemode = 1;
}

void __init sclp_early_detect(void)
{
	void *sccb = &sclp_early_sccb;

	sclp_early_facilities_detect(sccb);
	sclp_early_init_core_info(sccb);

	/*
	 * Turn off SCLP event notifications.  Also save remote masks in the
	 * sccb.  These are sufficient to detect sclp console capabilities.
	 */
	sclp_early_set_event_mask(sccb, 0, 0);
	sclp_early_console_detect(sccb);
}