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7#include <linux/kernel.h>
8#include <asm/processor.h>
9#include <asm/lowcore.h>
10#include <asm/ebcdic.h>
11#include <asm/irq.h>
12#include <asm/sections.h>
13#include <asm/mem_detect.h>
14#include <asm/facility.h>
15#include "sclp.h"
16#include "sclp_rw.h"
17
18static struct read_info_sccb __bootdata(sclp_info_sccb);
19static int __bootdata(sclp_info_sccb_valid);
20char *sclp_early_sccb = (char *) EARLY_SCCB_OFFSET;
21int sclp_init_state = sclp_init_state_uninitialized;
22
23
24
25
26bool sclp_mask_compat_mode;
27
28void sclp_early_wait_irq(void)
29{
30 unsigned long psw_mask, addr;
31 psw_t psw_ext_save, psw_wait;
32 union ctlreg0 cr0, cr0_new;
33
34 __ctl_store(cr0.val, 0, 0);
35 cr0_new.val = cr0.val & ~CR0_IRQ_SUBCLASS_MASK;
36 cr0_new.lap = 0;
37 cr0_new.sssm = 1;
38 __ctl_load(cr0_new.val, 0, 0);
39
40 psw_ext_save = S390_lowcore.external_new_psw;
41 psw_mask = __extract_psw();
42 S390_lowcore.external_new_psw.mask = psw_mask;
43 psw_wait.mask = psw_mask | PSW_MASK_EXT | PSW_MASK_WAIT;
44 S390_lowcore.ext_int_code = 0;
45
46 do {
47 asm volatile(
48 " larl %[addr],0f\n"
49 " stg %[addr],%[psw_wait_addr]\n"
50 " stg %[addr],%[psw_ext_addr]\n"
51 " lpswe %[psw_wait]\n"
52 "0:\n"
53 : [addr] "=&d" (addr),
54 [psw_wait_addr] "=Q" (psw_wait.addr),
55 [psw_ext_addr] "=Q" (S390_lowcore.external_new_psw.addr)
56 : [psw_wait] "Q" (psw_wait)
57 : "cc", "memory");
58 } while (S390_lowcore.ext_int_code != EXT_IRQ_SERVICE_SIG);
59
60 S390_lowcore.external_new_psw = psw_ext_save;
61 __ctl_load(cr0.val, 0, 0);
62}
63
64int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb)
65{
66 unsigned long flags;
67 int rc;
68
69 flags = arch_local_irq_save();
70 rc = sclp_service_call(cmd, sccb);
71 if (rc)
72 goto out;
73 sclp_early_wait_irq();
74out:
75 arch_local_irq_restore(flags);
76 return rc;
77}
78
79struct write_sccb {
80 struct sccb_header header;
81 struct msg_buf msg;
82} __packed;
83
84
85static void sclp_early_print_lm(const char *str, unsigned int len)
86{
87 unsigned char *ptr, *end, ch;
88 unsigned int count, offset;
89 struct write_sccb *sccb;
90 struct msg_buf *msg;
91 struct mdb *mdb;
92 struct mto *mto;
93 struct go *go;
94
95 sccb = (struct write_sccb *) sclp_early_sccb;
96 end = (unsigned char *) sccb + EARLY_SCCB_SIZE - 1;
97 memset(sccb, 0, sizeof(*sccb));
98 ptr = (unsigned char *) &sccb->msg.mdb.mto;
99 offset = 0;
100 do {
101 for (count = sizeof(*mto); offset < len; count++) {
102 ch = str[offset++];
103 if ((ch == 0x0a) || (ptr + count > end))
104 break;
105 ptr[count] = _ascebc[ch];
106 }
107 mto = (struct mto *) ptr;
108 memset(mto, 0, sizeof(*mto));
109 mto->length = count;
110 mto->type = 4;
111 mto->line_type_flags = LNTPFLGS_ENDTEXT;
112 ptr += count;
113 } while ((offset < len) && (ptr + sizeof(*mto) <= end));
114 len = ptr - (unsigned char *) sccb;
115 sccb->header.length = len - offsetof(struct write_sccb, header);
116 msg = &sccb->msg;
117 msg->header.type = EVTYP_MSG;
118 msg->header.length = len - offsetof(struct write_sccb, msg.header);
119 mdb = &msg->mdb;
120 mdb->header.type = 1;
121 mdb->header.tag = 0xD4C4C240;
122 mdb->header.revision_code = 1;
123 mdb->header.length = len - offsetof(struct write_sccb, msg.mdb.header);
124 go = &mdb->go;
125 go->length = sizeof(*go);
126 go->type = 1;
127 sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb);
128}
129
130struct vt220_sccb {
131 struct sccb_header header;
132 struct {
133 struct evbuf_header header;
134 char data[];
135 } msg;
136} __packed;
137
138
139static void sclp_early_print_vt220(const char *str, unsigned int len)
140{
141 struct vt220_sccb *sccb;
142
143 sccb = (struct vt220_sccb *) sclp_early_sccb;
144 if (sizeof(*sccb) + len >= EARLY_SCCB_SIZE)
145 len = EARLY_SCCB_SIZE - sizeof(*sccb);
146 memset(sccb, 0, sizeof(*sccb));
147 memcpy(&sccb->msg.data, str, len);
148 sccb->header.length = sizeof(*sccb) + len;
149 sccb->msg.header.length = sizeof(sccb->msg) + len;
150 sccb->msg.header.type = EVTYP_VT220MSG;
151 sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb);
152}
153
154int sclp_early_set_event_mask(struct init_sccb *sccb,
155 sccb_mask_t receive_mask,
156 sccb_mask_t send_mask)
157{
158retry:
159 memset(sccb, 0, sizeof(*sccb));
160 sccb->header.length = sizeof(*sccb);
161 if (sclp_mask_compat_mode)
162 sccb->mask_length = SCLP_MASK_SIZE_COMPAT;
163 else
164 sccb->mask_length = sizeof(sccb_mask_t);
165 sccb_set_recv_mask(sccb, receive_mask);
166 sccb_set_send_mask(sccb, send_mask);
167 if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_MASK, sccb))
168 return -EIO;
169 if ((sccb->header.response_code == 0x74f0) && !sclp_mask_compat_mode) {
170 sclp_mask_compat_mode = true;
171 goto retry;
172 }
173 if (sccb->header.response_code != 0x20)
174 return -EIO;
175 return 0;
176}
177
178unsigned int sclp_early_con_check_linemode(struct init_sccb *sccb)
179{
180 if (!(sccb_get_sclp_send_mask(sccb) & EVTYP_OPCMD_MASK))
181 return 0;
182 if (!(sccb_get_sclp_recv_mask(sccb) & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
183 return 0;
184 return 1;
185}
186
187unsigned int sclp_early_con_check_vt220(struct init_sccb *sccb)
188{
189 if (sccb_get_sclp_send_mask(sccb) & EVTYP_VT220MSG_MASK)
190 return 1;
191 return 0;
192}
193
194static int sclp_early_setup(int disable, int *have_linemode, int *have_vt220)
195{
196 unsigned long receive_mask, send_mask;
197 struct init_sccb *sccb;
198 int rc;
199
200 BUILD_BUG_ON(sizeof(struct init_sccb) > PAGE_SIZE);
201
202 *have_linemode = *have_vt220 = 0;
203 sccb = (struct init_sccb *) sclp_early_sccb;
204 receive_mask = disable ? 0 : EVTYP_OPCMD_MASK;
205 send_mask = disable ? 0 : EVTYP_VT220MSG_MASK | EVTYP_MSG_MASK;
206 rc = sclp_early_set_event_mask(sccb, receive_mask, send_mask);
207 if (rc)
208 return rc;
209 *have_linemode = sclp_early_con_check_linemode(sccb);
210 *have_vt220 = !!(sccb_get_send_mask(sccb) & EVTYP_VT220MSG_MASK);
211 return rc;
212}
213
214
215
216
217
218void __sclp_early_printk(const char *str, unsigned int len)
219{
220 int have_linemode, have_vt220;
221
222 if (sclp_init_state != sclp_init_state_uninitialized)
223 return;
224 if (sclp_early_setup(0, &have_linemode, &have_vt220) != 0)
225 return;
226 if (have_linemode)
227 sclp_early_print_lm(str, len);
228 if (have_vt220)
229 sclp_early_print_vt220(str, len);
230 sclp_early_setup(1, &have_linemode, &have_vt220);
231}
232
233void sclp_early_printk(const char *str)
234{
235 __sclp_early_printk(str, strlen(str));
236}
237
238int __init sclp_early_read_info(void)
239{
240 int i;
241 int length = test_facility(140) ? EXT_SCCB_READ_SCP : PAGE_SIZE;
242 struct read_info_sccb *sccb = &sclp_info_sccb;
243 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
244 SCLP_CMDW_READ_SCP_INFO};
245
246 for (i = 0; i < ARRAY_SIZE(commands); i++) {
247 memset(sccb, 0, length);
248 sccb->header.length = length;
249 sccb->header.function_code = 0x80;
250 sccb->header.control_mask[2] = 0x80;
251 if (sclp_early_cmd(commands[i], sccb))
252 break;
253 if (sccb->header.response_code == 0x10) {
254 sclp_info_sccb_valid = 1;
255 return 0;
256 }
257 if (sccb->header.response_code != 0x1f0)
258 break;
259 }
260 return -EIO;
261}
262
263struct read_info_sccb * __init sclp_early_get_info(void)
264{
265 if (!sclp_info_sccb_valid)
266 return NULL;
267
268 return &sclp_info_sccb;
269}
270
271int __init sclp_early_get_memsize(unsigned long *mem)
272{
273 unsigned long rnmax;
274 unsigned long rnsize;
275 struct read_info_sccb *sccb = &sclp_info_sccb;
276
277 if (!sclp_info_sccb_valid)
278 return -EIO;
279
280 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
281 rnsize = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
282 rnsize <<= 20;
283 *mem = rnsize * rnmax;
284 return 0;
285}
286
287int __init sclp_early_get_hsa_size(unsigned long *hsa_size)
288{
289 if (!sclp_info_sccb_valid)
290 return -EIO;
291
292 *hsa_size = 0;
293 if (sclp_info_sccb.hsa_size)
294 *hsa_size = (sclp_info_sccb.hsa_size - 1) * PAGE_SIZE;
295 return 0;
296}
297
298#define SCLP_STORAGE_INFO_FACILITY 0x0000400000000000UL
299
300void __weak __init add_mem_detect_block(u64 start, u64 end) {}
301int __init sclp_early_read_storage_info(void)
302{
303 struct read_storage_sccb *sccb = (struct read_storage_sccb *)sclp_early_sccb;
304 int rc, id, max_id = 0;
305 unsigned long rn, rzm;
306 sclp_cmdw_t command;
307 u16 sn;
308
309 if (!sclp_info_sccb_valid)
310 return -EIO;
311
312 if (!(sclp_info_sccb.facilities & SCLP_STORAGE_INFO_FACILITY))
313 return -EOPNOTSUPP;
314
315 rzm = sclp_info_sccb.rnsize ?: sclp_info_sccb.rnsize2;
316 rzm <<= 20;
317
318 for (id = 0; id <= max_id; id++) {
319 memset(sclp_early_sccb, 0, EARLY_SCCB_SIZE);
320 sccb->header.length = EARLY_SCCB_SIZE;
321 command = SCLP_CMDW_READ_STORAGE_INFO | (id << 8);
322 rc = sclp_early_cmd(command, sccb);
323 if (rc)
324 goto fail;
325
326 max_id = sccb->max_id;
327 switch (sccb->header.response_code) {
328 case 0x0010:
329 for (sn = 0; sn < sccb->assigned; sn++) {
330 if (!sccb->entries[sn])
331 continue;
332 rn = sccb->entries[sn] >> 16;
333 add_mem_detect_block((rn - 1) * rzm, rn * rzm);
334 }
335 break;
336 case 0x0310:
337 case 0x0410:
338 break;
339 default:
340 goto fail;
341 }
342 }
343
344 return 0;
345fail:
346 mem_detect.count = 0;
347 return -EIO;
348}
349
