4 * Copyright IBM Corp. 2013
7 #define KMSG_COMPONENT "sclp_early"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <asm/ctl_reg.h>
13 #include "sclp_sdias.h"
16 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
17 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
19 struct read_info_sccb
{
20 struct sccb_header header
; /* 0-7 */
23 u8 _reserved0
[16 - 11]; /* 11-15 */
24 u16 ncpurl
; /* 16-17 */
25 u16 cpuoff
; /* 18-19 */
26 u8 _reserved7
[24 - 20]; /* 20-23 */
27 u8 loadparm
[8]; /* 24-31 */
28 u8 _reserved1
[48 - 32]; /* 32-47 */
29 u64 facilities
; /* 48-55 */
30 u8 _reserved2a
[76 - 56]; /* 56-75 */
32 u8 _reserved2b
[84 - 80]; /* 80-83 */
35 u8 _reserved3
[91 - 86]; /* 86-90 */
37 u8 _reserved4
[100 - 92]; /* 92-99 */
38 u32 rnsize2
; /* 100-103 */
39 u64 rnmax2
; /* 104-111 */
40 u8 _reserved5
[120 - 112]; /* 112-119 */
41 u16 hcpua
; /* 120-121 */
42 u8 _reserved6
[4096 - 122]; /* 122-4095 */
43 } __packed
__aligned(PAGE_SIZE
);
45 static char sccb_early
[PAGE_SIZE
] __aligned(PAGE_SIZE
) __initdata
;
46 static unsigned int sclp_con_has_vt220 __initdata
;
47 static unsigned int sclp_con_has_linemode __initdata
;
48 static unsigned long sclp_hsa_size
;
49 static unsigned int sclp_max_cpu
;
50 static struct sclp_ipl_info sclp_ipl_info
;
51 static unsigned char sclp_siif
;
56 unsigned long long sclp_rzm
;
57 unsigned long long sclp_rnmax
;
59 static int __init
sclp_cmd_sync_early(sclp_cmdw_t cmd
, void *sccb
)
64 rc
= sclp_service_call(cmd
, sccb
);
67 __load_psw_mask(PSW_DEFAULT_KEY
| PSW_MASK_BASE
| PSW_MASK_EA
|
68 PSW_MASK_BA
| PSW_MASK_EXT
| PSW_MASK_WAIT
);
71 /* Contents of the sccb might have changed. */
73 __ctl_clear_bit(0, 9);
77 static int __init
sclp_read_info_early(struct read_info_sccb
*sccb
)
80 sclp_cmdw_t commands
[] = {SCLP_CMDW_READ_SCP_INFO_FORCED
,
81 SCLP_CMDW_READ_SCP_INFO
};
83 for (i
= 0; i
< ARRAY_SIZE(commands
); i
++) {
85 memset(sccb
, 0, sizeof(*sccb
));
86 sccb
->header
.length
= sizeof(*sccb
);
87 sccb
->header
.function_code
= 0x80;
88 sccb
->header
.control_mask
[2] = 0x80;
89 rc
= sclp_cmd_sync_early(commands
[i
], sccb
);
90 } while (rc
== -EBUSY
);
94 if (sccb
->header
.response_code
== 0x10)
96 if (sccb
->header
.response_code
!= 0x1f0)
102 static void __init
sclp_facilities_detect(struct read_info_sccb
*sccb
)
104 struct sclp_cpu_entry
*cpue
;
105 u16 boot_cpu_address
, cpu
;
107 if (sclp_read_info_early(sccb
))
110 sclp_facilities
= sccb
->facilities
;
111 sclp_fac84
= sccb
->fac84
;
112 if (sccb
->fac85
& 0x02)
113 S390_lowcore
.machine_flags
|= MACHINE_FLAG_ESOP
;
114 sclp_rnmax
= sccb
->rnmax
? sccb
->rnmax
: sccb
->rnmax2
;
115 sclp_rzm
= sccb
->rnsize
? sccb
->rnsize
: sccb
->rnsize2
;
117 sclp_ibc
= sccb
->ibc
;
123 sclp_max_cpu
= sccb
->ncpurl
;
125 sclp_max_cpu
= sccb
->hcpua
+ 1;
128 boot_cpu_address
= stap();
129 cpue
= (void *)sccb
+ sccb
->cpuoff
;
130 for (cpu
= 0; cpu
< sccb
->ncpurl
; cpue
++, cpu
++) {
131 if (boot_cpu_address
!= cpue
->address
)
133 sclp_siif
= cpue
->siif
;
137 /* Save IPL information */
138 sclp_ipl_info
.is_valid
= 1;
139 if (sccb
->flags
& 0x2)
140 sclp_ipl_info
.has_dump
= 1;
141 memcpy(&sclp_ipl_info
.loadparm
, &sccb
->loadparm
, LOADPARM_LEN
);
144 bool __init
sclp_has_linemode(void)
146 return !!sclp_con_has_linemode
;
149 bool __init
sclp_has_vt220(void)
151 return !!sclp_con_has_vt220
;
154 unsigned long long sclp_get_rnmax(void)
159 unsigned long long sclp_get_rzm(void)
164 unsigned int sclp_get_max_cpu(void)
169 int sclp_has_siif(void)
173 EXPORT_SYMBOL(sclp_has_siif
);
175 unsigned int sclp_get_ibc(void)
179 EXPORT_SYMBOL(sclp_get_ibc
);
182 * This function will be called after sclp_facilities_detect(), which gets
183 * called from early.c code. The sclp_facilities_detect() function retrieves
184 * and saves the IPL information.
186 void __init
sclp_get_ipl_info(struct sclp_ipl_info
*info
)
188 *info
= sclp_ipl_info
;
191 static int __init
sclp_cmd_early(sclp_cmdw_t cmd
, void *sccb
)
196 rc
= sclp_cmd_sync_early(cmd
, sccb
);
197 } while (rc
== -EBUSY
);
201 if (((struct sccb_header
*) sccb
)->response_code
!= 0x0020)
206 static void __init
sccb_init_eq_size(struct sdias_sccb
*sccb
)
208 memset(sccb
, 0, sizeof(*sccb
));
210 sccb
->hdr
.length
= sizeof(*sccb
);
211 sccb
->evbuf
.hdr
.length
= sizeof(struct sdias_evbuf
);
212 sccb
->evbuf
.hdr
.type
= EVTYP_SDIAS
;
213 sccb
->evbuf
.event_qual
= SDIAS_EQ_SIZE
;
214 sccb
->evbuf
.data_id
= SDIAS_DI_FCP_DUMP
;
215 sccb
->evbuf
.event_id
= 4712;
219 static int __init
sclp_set_event_mask(struct init_sccb
*sccb
,
220 unsigned long receive_mask
,
221 unsigned long send_mask
)
223 memset(sccb
, 0, sizeof(*sccb
));
224 sccb
->header
.length
= sizeof(*sccb
);
225 sccb
->mask_length
= sizeof(sccb_mask_t
);
226 sccb
->receive_mask
= receive_mask
;
227 sccb
->send_mask
= send_mask
;
228 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK
, sccb
);
231 static long __init
sclp_hsa_size_init(struct sdias_sccb
*sccb
)
233 sccb_init_eq_size(sccb
);
234 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA
, sccb
))
236 if (sccb
->evbuf
.blk_cnt
== 0)
238 return (sccb
->evbuf
.blk_cnt
- 1) * PAGE_SIZE
;
241 static long __init
sclp_hsa_copy_wait(struct sccb_header
*sccb
)
243 memset(sccb
, 0, PAGE_SIZE
);
244 sccb
->length
= PAGE_SIZE
;
245 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA
, sccb
))
247 if (((struct sdias_sccb
*) sccb
)->evbuf
.blk_cnt
== 0)
249 return (((struct sdias_sccb
*) sccb
)->evbuf
.blk_cnt
- 1) * PAGE_SIZE
;
252 unsigned long sclp_get_hsa_size(void)
254 return sclp_hsa_size
;
257 static void __init
sclp_hsa_size_detect(void *sccb
)
261 /* First try synchronous interface (LPAR) */
262 if (sclp_set_event_mask(sccb
, 0, 0x40000010))
264 size
= sclp_hsa_size_init(sccb
);
269 /* Then try asynchronous interface (z/VM) */
270 if (sclp_set_event_mask(sccb
, 0x00000010, 0x40000010))
272 size
= sclp_hsa_size_init(sccb
);
275 size
= sclp_hsa_copy_wait(sccb
);
279 sclp_hsa_size
= size
;
282 static unsigned int __init
sclp_con_check_linemode(struct init_sccb
*sccb
)
284 if (!(sccb
->sclp_send_mask
& EVTYP_OPCMD_MASK
))
286 if (!(sccb
->sclp_receive_mask
& (EVTYP_MSG_MASK
| EVTYP_PMSGCMD_MASK
)))
291 static void __init
sclp_console_detect(struct init_sccb
*sccb
)
293 if (sccb
->header
.response_code
!= 0x20)
296 if (sccb
->sclp_send_mask
& EVTYP_VT220MSG_MASK
)
297 sclp_con_has_vt220
= 1;
299 if (sclp_con_check_linemode(sccb
))
300 sclp_con_has_linemode
= 1;
303 void __init
sclp_early_detect(void)
305 void *sccb
= &sccb_early
;
307 sclp_facilities_detect(sccb
);
308 sclp_hsa_size_detect(sccb
);
310 /* Turn off SCLP event notifications. Also save remote masks in the
311 * sccb. These are sufficient to detect sclp console capabilities.
313 sclp_set_event_mask(sccb
, 0, 0);
314 sclp_console_detect(sccb
);