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 | EVTYP_PMSGCMD_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);