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Merge branch 'for-3.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux/fpc-iii.git] / arch / s390 / kernel / early.c
blobcef2879edff321e151972f059973cd7e9babca68
1 /*
2 * Copyright IBM Corp. 2007, 2009
3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
4 * Heiko Carstens <heiko.carstens@de.ibm.com>
5 */
6
7 #define KMSG_COMPONENT "setup"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10 #include <linux/compiler.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/ctype.h>
15 #include <linux/ftrace.h>
16 #include <linux/lockdep.h>
17 #include <linux/module.h>
18 #include <linux/pfn.h>
19 #include <linux/uaccess.h>
20 #include <linux/kernel.h>
21 #include <asm/ebcdic.h>
22 #include <asm/ipl.h>
23 #include <asm/lowcore.h>
24 #include <asm/processor.h>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sysinfo.h>
28 #include <asm/cpcmd.h>
29 #include <asm/sclp.h>
30 #include <asm/facility.h>
31 #include "entry.h"
32
33 /*
34 * Create a Kernel NSS if the SAVESYS= parameter is defined
35 */
36 #define DEFSYS_CMD_SIZE 128
37 #define SAVESYS_CMD_SIZE 32
38
39 char kernel_nss_name[NSS_NAME_SIZE + 1];
40
41 static void __init setup_boot_command_line(void);
42
43 /*
44 * Get the TOD clock running.
45 */
46 static void __init reset_tod_clock(void)
47 {
48 u64 time;
49
50 if (store_tod_clock(&time) == 0)
51 return;
52 /* TOD clock not running. Set the clock to Unix Epoch. */
53 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
54 disabled_wait(0);
55
56 sched_clock_base_cc = TOD_UNIX_EPOCH;
57 S390_lowcore.last_update_clock = sched_clock_base_cc;
58 }
59
60 #ifdef CONFIG_SHARED_KERNEL
61 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
62
63 asm(
64 " .section .init.text,\"ax\",@progbits\n"
65 " .align 4\n"
66 " .type savesys_ipl_nss, @function\n"
67 "savesys_ipl_nss:\n"
68 #ifdef CONFIG_64BIT
69 " stmg 6,15,48(15)\n"
70 " lgr 14,3\n"
71 " sam31\n"
72 " diag 2,14,0x8\n"
73 " sam64\n"
74 " lgr 2,14\n"
75 " lmg 6,15,48(15)\n"
76 #else
77 " stm 6,15,24(15)\n"
78 " lr 14,3\n"
79 " diag 2,14,0x8\n"
80 " lr 2,14\n"
81 " lm 6,15,24(15)\n"
82 #endif
83 " br 14\n"
84 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
85 " .previous\n");
86
87 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
88
89 static noinline __init void create_kernel_nss(void)
90 {
91 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
92 #ifdef CONFIG_BLK_DEV_INITRD
93 unsigned int sinitrd_pfn, einitrd_pfn;
94 #endif
95 int response;
96 int hlen;
97 size_t len;
98 char *savesys_ptr;
99 char defsys_cmd[DEFSYS_CMD_SIZE];
100 char savesys_cmd[SAVESYS_CMD_SIZE];
101
102 /* Do nothing if we are not running under VM */
103 if (!MACHINE_IS_VM)
104 return;
105
106 /* Convert COMMAND_LINE to upper case */
107 for (i = 0; i < strlen(boot_command_line); i++)
108 upper_command_line[i] = toupper(boot_command_line[i]);
109
110 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
111
112 if (!savesys_ptr)
113 return;
114
115 savesys_ptr += 8; /* Point to the beginning of the NSS name */
116 for (i = 0; i < NSS_NAME_SIZE; i++) {
117 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
118 break;
119 kernel_nss_name[i] = savesys_ptr[i];
120 }
121
122 stext_pfn = PFN_DOWN(__pa(&_stext));
123 eshared_pfn = PFN_DOWN(__pa(&_eshared));
124 end_pfn = PFN_UP(__pa(&_end));
125 min_size = end_pfn << 2;
126
127 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
128 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
129 kernel_nss_name, stext_pfn - 1, stext_pfn,
130 eshared_pfn - 1, eshared_pfn, end_pfn);
131
132 #ifdef CONFIG_BLK_DEV_INITRD
133 if (INITRD_START && INITRD_SIZE) {
134 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
135 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
136 min_size = einitrd_pfn << 2;
137 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
138 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
139 }
140 #endif
141
142 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
143 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
144 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
145 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
146 kernel_nss_name, kernel_nss_name);
147 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
148
149 __cpcmd(defsys_cmd, NULL, 0, &response);
150
151 if (response != 0) {
152 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
153 response);
154 kernel_nss_name[0] = '\0';
155 return;
156 }
157
158 len = strlen(savesys_cmd);
159 ASCEBC(savesys_cmd, len);
160 response = savesys_ipl_nss(savesys_cmd, len);
161
162 /* On success: response is equal to the command size,
163 * max SAVESYS_CMD_SIZE
164 * On error: response contains the numeric portion of cp error message.
165 * for SAVESYS it will be >= 263
166 * for missing privilege class, it will be 1
167 */
168 if (response > SAVESYS_CMD_SIZE || response == 1) {
169 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
170 response);
171 kernel_nss_name[0] = '\0';
172 return;
173 }
174
175 /* re-initialize cputime accounting. */
176 sched_clock_base_cc = get_tod_clock();
177 S390_lowcore.last_update_clock = sched_clock_base_cc;
178 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
179 S390_lowcore.user_timer = 0;
180 S390_lowcore.system_timer = 0;
181 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
182
183 /* re-setup boot command line with new ipl vm parms */
184 ipl_update_parameters();
185 setup_boot_command_line();
186
187 ipl_flags = IPL_NSS_VALID;
188 }
189
190 #else /* CONFIG_SHARED_KERNEL */
191
192 static inline void create_kernel_nss(void) { }
193
194 #endif /* CONFIG_SHARED_KERNEL */
195
196 /*
197 * Clear bss memory
198 */
199 static noinline __init void clear_bss_section(void)
200 {
201 memset(__bss_start, 0, __bss_stop - __bss_start);
202 }
203
204 /*
205 * Initialize storage key for kernel pages
206 */
207 static noinline __init void init_kernel_storage_key(void)
208 {
209 #if PAGE_DEFAULT_KEY
210 unsigned long end_pfn, init_pfn;
211
212 end_pfn = PFN_UP(__pa(&_end));
213
214 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
215 page_set_storage_key(init_pfn << PAGE_SHIFT,
216 PAGE_DEFAULT_KEY, 0);
217 #endif
218 }
219
220 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
221
222 static noinline __init void detect_machine_type(void)
223 {
224 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
225
226 /* Check current-configuration-level */
227 if (stsi(NULL, 0, 0, 0) <= 2) {
228 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
229 return;
230 }
231 /* Get virtual-machine cpu information. */
232 if (stsi(vmms, 3, 2, 2) || !vmms->count)
233 return;
234
235 /* Running under KVM? If not we assume z/VM */
236 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
237 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
238 else
239 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
240 }
241
242 static __init void setup_topology(void)
243 {
244 #ifdef CONFIG_64BIT
245 int max_mnest;
246
247 if (!test_facility(11))
248 return;
249 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
250 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
251 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
252 break;
253 }
254 topology_max_mnest = max_mnest;
255 #endif
256 }
257
258 static void early_pgm_check_handler(void)
259 {
260 const struct exception_table_entry *fixup;
261 unsigned long cr0, cr0_new;
262 unsigned long addr;
263
264 addr = S390_lowcore.program_old_psw.addr;
265 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
266 if (!fixup)
267 disabled_wait(0);
268 /* Disable low address protection before storing into lowcore. */
269 __ctl_store(cr0, 0, 0);
270 cr0_new = cr0 & ~(1UL << 28);
271 __ctl_load(cr0_new, 0, 0);
272 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
273 __ctl_load(cr0, 0, 0);
274 }
275
276 static noinline __init void setup_lowcore_early(void)
277 {
278 psw_t psw;
279
280 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
281 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
282 S390_lowcore.external_new_psw = psw;
283 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
284 S390_lowcore.program_new_psw = psw;
285 s390_base_pgm_handler_fn = early_pgm_check_handler;
286 }
287
288 static noinline __init void setup_facility_list(void)
289 {
290 stfle(S390_lowcore.stfle_fac_list,
291 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
292 }
293
294 static __init void detect_mvpg(void)
295 {
296 #ifndef CONFIG_64BIT
297 int rc;
298
299 asm volatile(
300 " la 0,0\n"
301 " mvpg %2,%2\n"
302 "0: la %0,0\n"
303 "1:\n"
304 EX_TABLE(0b,1b)
305 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
306 if (!rc)
307 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
308 #endif
309 }
310
311 static __init void detect_ieee(void)
312 {
313 #ifndef CONFIG_64BIT
314 int rc, tmp;
315
316 asm volatile(
317 " efpc %1,0\n"
318 "0: la %0,0\n"
319 "1:\n"
320 EX_TABLE(0b,1b)
321 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
322 if (!rc)
323 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
324 #endif
325 }
326
327 static __init void detect_csp(void)
328 {
329 #ifndef CONFIG_64BIT
330 int rc;
331
332 asm volatile(
333 " la 0,0\n"
334 " la 1,0\n"
335 " la 2,4\n"
336 " csp 0,2\n"
337 "0: la %0,0\n"
338 "1:\n"
339 EX_TABLE(0b,1b)
340 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
341 if (!rc)
342 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
343 #endif
344 }
345
346 static __init void detect_diag9c(void)
347 {
348 unsigned int cpu_address;
349 int rc;
350
351 cpu_address = stap();
352 asm volatile(
353 " diag %2,0,0x9c\n"
354 "0: la %0,0\n"
355 "1:\n"
356 EX_TABLE(0b,1b)
357 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
358 if (!rc)
359 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
360 }
361
362 static __init void detect_diag44(void)
363 {
364 #ifdef CONFIG_64BIT
365 int rc;
366
367 asm volatile(
368 " diag 0,0,0x44\n"
369 "0: la %0,0\n"
370 "1:\n"
371 EX_TABLE(0b,1b)
372 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
373 if (!rc)
374 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
375 #endif
376 }
377
378 static __init void detect_machine_facilities(void)
379 {
380 #ifdef CONFIG_64BIT
381 if (test_facility(8)) {
382 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
383 __ctl_set_bit(0, 23);
384 }
385 if (test_facility(78))
386 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
387 if (test_facility(3))
388 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
389 if (test_facility(40))
390 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
391 if (test_facility(50) && test_facility(73))
392 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
393 if (test_facility(51))
394 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
395 if (test_facility(129))
396 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
397 #endif
398 }
399
400 static __init void rescue_initrd(void)
401 {
402 #ifdef CONFIG_BLK_DEV_INITRD
403 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
404 /*
405 * Just like in case of IPL from VM reader we make sure there is a
406 * gap of 4MB between end of kernel and start of initrd.
407 * That way we can also be sure that saving an NSS will succeed,
408 * which however only requires different segments.
409 */
410 if (!INITRD_START || !INITRD_SIZE)
411 return;
412 if (INITRD_START >= min_initrd_addr)
413 return;
414 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
415 INITRD_START = min_initrd_addr;
416 #endif
417 }
418
419 /* Set up boot command line */
420 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
421 {
422 char *parm, *delim;
423 size_t rc, len;
424
425 len = strlen(boot_command_line);
426
427 delim = boot_command_line + len; /* '\0' character position */
428 parm = boot_command_line + len + 1; /* append right after '\0' */
429
430 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
431 if (rc) {
432 if (*parm == '=')
433 memmove(boot_command_line, parm + 1, rc);
434 else
435 *delim = ' '; /* replace '\0' with space */
436 }
437 }
438
439 static inline int has_ebcdic_char(const char *str)
440 {
441 int i;
442
443 for (i = 0; str[i]; i++)
444 if (str[i] & 0x80)
445 return 1;
446 return 0;
447 }
448
449 static void __init setup_boot_command_line(void)
450 {
451 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
452 /* convert arch command line to ascii if necessary */
453 if (has_ebcdic_char(COMMAND_LINE))
454 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
455 /* copy arch command line */
456 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
457 ARCH_COMMAND_LINE_SIZE);
458
459 /* append IPL PARM data to the boot command line */
460 if (MACHINE_IS_VM)
461 append_to_cmdline(append_ipl_vmparm);
462
463 append_to_cmdline(append_ipl_scpdata);
464 }
465
466 /*
467 * Save ipl parameters, clear bss memory, initialize storage keys
468 * and create a kernel NSS at startup if the SAVESYS= parm is defined
469 */
470 void __init startup_init(void)
471 {
472 reset_tod_clock();
473 ipl_save_parameters();
474 rescue_initrd();
475 clear_bss_section();
476 init_kernel_storage_key();
477 lockdep_init();
478 lockdep_off();
479 setup_lowcore_early();
480 setup_facility_list();
481 detect_machine_type();
482 ipl_update_parameters();
483 setup_boot_command_line();
484 create_kernel_nss();
485 detect_mvpg();
486 detect_ieee();
487 detect_csp();
488 detect_diag9c();
489 detect_diag44();
490 detect_machine_facilities();
491 setup_topology();
492 sclp_early_detect();
493 #ifdef CONFIG_DYNAMIC_FTRACE
494 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
495 #endif
496 lockdep_on();
497 }
Linux with added FPC-III support