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/lockdep.h>
16 #include <linux/extable.h>
17 #include <linux/pfn.h>
18 #include <linux/uaccess.h>
19 #include <linux/kernel.h>
20 #include <asm/diag.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 */
reset_tod_clock(void)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 " stmg 6,15,48(15)\n"
69 " lgr 14,3\n"
70 " sam31\n"
71 " diag 2,14,0x8\n"
72 " sam64\n"
73 " lgr 2,14\n"
74 " lmg 6,15,48(15)\n"
75 " br 14\n"
76 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
77 " .previous\n");
78
79 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
80
create_kernel_nss(void)81 static noinline __init void create_kernel_nss(void)
82 {
83 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
84 #ifdef CONFIG_BLK_DEV_INITRD
85 unsigned int sinitrd_pfn, einitrd_pfn;
86 #endif
87 int response;
88 int hlen;
89 size_t len;
90 char *savesys_ptr;
91 char defsys_cmd[DEFSYS_CMD_SIZE];
92 char savesys_cmd[SAVESYS_CMD_SIZE];
93
94 /* Do nothing if we are not running under VM */
95 if (!MACHINE_IS_VM)
96 return;
97
98 /* Convert COMMAND_LINE to upper case */
99 for (i = 0; i < strlen(boot_command_line); i++)
100 upper_command_line[i] = toupper(boot_command_line[i]);
101
102 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
103
104 if (!savesys_ptr)
105 return;
106
107 savesys_ptr += 8; /* Point to the beginning of the NSS name */
108 for (i = 0; i < NSS_NAME_SIZE; i++) {
109 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
110 break;
111 kernel_nss_name[i] = savesys_ptr[i];
112 }
113
114 stext_pfn = PFN_DOWN(__pa(&_stext));
115 eshared_pfn = PFN_DOWN(__pa(&_eshared));
116 end_pfn = PFN_UP(__pa(&_end));
117 min_size = end_pfn << 2;
118
119 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
120 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
121 kernel_nss_name, stext_pfn - 1, stext_pfn,
122 eshared_pfn - 1, eshared_pfn, end_pfn);
123
124 #ifdef CONFIG_BLK_DEV_INITRD
125 if (INITRD_START && INITRD_SIZE) {
126 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
127 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
128 min_size = einitrd_pfn << 2;
129 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
130 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
131 }
132 #endif
133
134 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
135 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
136 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
137 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
138 kernel_nss_name, kernel_nss_name);
139 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
140
141 __cpcmd(defsys_cmd, NULL, 0, &response);
142
143 if (response != 0) {
144 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
145 response);
146 kernel_nss_name[0] = '\0';
147 return;
148 }
149
150 len = strlen(savesys_cmd);
151 ASCEBC(savesys_cmd, len);
152 response = savesys_ipl_nss(savesys_cmd, len);
153
154 /* On success: response is equal to the command size,
155 * max SAVESYS_CMD_SIZE
156 * On error: response contains the numeric portion of cp error message.
157 * for SAVESYS it will be >= 263
158 * for missing privilege class, it will be 1
159 */
160 if (response > SAVESYS_CMD_SIZE || response == 1) {
161 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
162 response);
163 kernel_nss_name[0] = '\0';
164 return;
165 }
166
167 /* re-initialize cputime accounting. */
168 sched_clock_base_cc = get_tod_clock();
169 S390_lowcore.last_update_clock = sched_clock_base_cc;
170 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
171 S390_lowcore.user_timer = 0;
172 S390_lowcore.system_timer = 0;
173 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
174
175 /* re-setup boot command line with new ipl vm parms */
176 ipl_update_parameters();
177 setup_boot_command_line();
178
179 ipl_flags = IPL_NSS_VALID;
180 }
181
182 #else /* CONFIG_SHARED_KERNEL */
183
create_kernel_nss(void)184 static inline void create_kernel_nss(void) { }
185
186 #endif /* CONFIG_SHARED_KERNEL */
187
188 /*
189 * Clear bss memory
190 */
clear_bss_section(void)191 static noinline __init void clear_bss_section(void)
192 {
193 memset(__bss_start, 0, __bss_stop - __bss_start);
194 }
195
196 /*
197 * Initialize storage key for kernel pages
198 */
init_kernel_storage_key(void)199 static noinline __init void init_kernel_storage_key(void)
200 {
201 #if PAGE_DEFAULT_KEY
202 unsigned long end_pfn, init_pfn;
203
204 end_pfn = PFN_UP(__pa(&_end));
205
206 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
207 page_set_storage_key(init_pfn << PAGE_SHIFT,
208 PAGE_DEFAULT_KEY, 0);
209 #endif
210 }
211
212 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
213
detect_machine_type(void)214 static noinline __init void detect_machine_type(void)
215 {
216 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
217
218 /* Check current-configuration-level */
219 if (stsi(NULL, 0, 0, 0) <= 2) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
221 return;
222 }
223 /* Get virtual-machine cpu information. */
224 if (stsi(vmms, 3, 2, 2) || !vmms->count)
225 return;
226
227 /* Running under KVM? If not we assume z/VM */
228 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
230 else
231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
232 }
233
setup_arch_string(void)234 static noinline __init void setup_arch_string(void)
235 {
236 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
237
238 if (stsi(mach, 1, 1, 1))
239 return;
240 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
241 EBCASC(mach->type, sizeof(mach->type));
242 EBCASC(mach->model, sizeof(mach->model));
243 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
244 dump_stack_set_arch_desc("%-16.16s %-4.4s %-16.16s %-16.16s (%s)",
245 mach->manufacturer,
246 mach->type,
247 mach->model,
248 mach->model_capacity,
249 MACHINE_IS_LPAR ? "LPAR" :
250 MACHINE_IS_VM ? "z/VM" :
251 MACHINE_IS_KVM ? "KVM" : "unknown");
252 }
253
setup_topology(void)254 static __init void setup_topology(void)
255 {
256 int max_mnest;
257
258 if (!test_facility(11))
259 return;
260 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
261 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
262 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
263 break;
264 }
265 topology_max_mnest = max_mnest;
266 }
267
early_pgm_check_handler(void)268 static void early_pgm_check_handler(void)
269 {
270 const struct exception_table_entry *fixup;
271 unsigned long cr0, cr0_new;
272 unsigned long addr;
273
274 addr = S390_lowcore.program_old_psw.addr;
275 fixup = search_exception_tables(addr);
276 if (!fixup)
277 disabled_wait(0);
278 /* Disable low address protection before storing into lowcore. */
279 __ctl_store(cr0, 0, 0);
280 cr0_new = cr0 & ~(1UL << 28);
281 __ctl_load(cr0_new, 0, 0);
282 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
283 __ctl_load(cr0, 0, 0);
284 }
285
setup_lowcore_early(void)286 static noinline __init void setup_lowcore_early(void)
287 {
288 psw_t psw;
289
290 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
291 psw.addr = (unsigned long) s390_base_ext_handler;
292 S390_lowcore.external_new_psw = psw;
293 psw.addr = (unsigned long) s390_base_pgm_handler;
294 S390_lowcore.program_new_psw = psw;
295 s390_base_pgm_handler_fn = early_pgm_check_handler;
296 }
297
setup_facility_list(void)298 static noinline __init void setup_facility_list(void)
299 {
300 stfle(S390_lowcore.stfle_fac_list,
301 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
302 memcpy(S390_lowcore.alt_stfle_fac_list,
303 S390_lowcore.stfle_fac_list,
304 sizeof(S390_lowcore.alt_stfle_fac_list));
305 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
306 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
307 }
308
detect_diag9c(void)309 static __init void detect_diag9c(void)
310 {
311 unsigned int cpu_address;
312 int rc;
313
314 cpu_address = stap();
315 diag_stat_inc(DIAG_STAT_X09C);
316 asm volatile(
317 " diag %2,0,0x9c\n"
318 "0: la %0,0\n"
319 "1:\n"
320 EX_TABLE(0b,1b)
321 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
322 if (!rc)
323 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
324 }
325
detect_diag44(void)326 static __init void detect_diag44(void)
327 {
328 int rc;
329
330 diag_stat_inc(DIAG_STAT_X044);
331 asm volatile(
332 " diag 0,0,0x44\n"
333 "0: la %0,0\n"
334 "1:\n"
335 EX_TABLE(0b,1b)
336 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
337 if (!rc)
338 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
339 }
340
detect_machine_facilities(void)341 static __init void detect_machine_facilities(void)
342 {
343 if (test_facility(8)) {
344 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
345 __ctl_set_bit(0, 23);
346 }
347 if (test_facility(78))
348 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
349 if (test_facility(3))
350 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
351 if (test_facility(40))
352 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
353 if (test_facility(50) && test_facility(73)) {
354 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
355 __ctl_set_bit(0, 55);
356 }
357 if (test_facility(51))
358 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
359 if (test_facility(129)) {
360 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
361 __ctl_set_bit(0, 17);
362 }
363 }
364
save_vector_registers(void)365 static inline void save_vector_registers(void)
366 {
367 #ifdef CONFIG_CRASH_DUMP
368 if (test_facility(129))
369 save_vx_regs(boot_cpu_vector_save_area);
370 #endif
371 }
372
topology_setup(char * str)373 static int __init topology_setup(char *str)
374 {
375 bool enabled;
376 int rc;
377
378 rc = kstrtobool(str, &enabled);
379 if (!rc && !enabled)
380 S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY;
381 return rc;
382 }
383 early_param("topology", topology_setup);
384
disable_vector_extension(char * str)385 static int __init disable_vector_extension(char *str)
386 {
387 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
388 __ctl_clear_bit(0, 17);
389 return 1;
390 }
391 early_param("novx", disable_vector_extension);
392
cad_setup(char * str)393 static int __init cad_setup(char *str)
394 {
395 int val;
396
397 get_option(&str, &val);
398 if (val && test_facility(128))
399 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
400 return 0;
401 }
402 early_param("cad", cad_setup);
403
cad_init(void)404 static int __init cad_init(void)
405 {
406 if (MACHINE_HAS_CAD)
407 /* Enable problem state CAD. */
408 __ctl_set_bit(2, 3);
409 return 0;
410 }
411 early_initcall(cad_init);
412
rescue_initrd(void)413 static __init void rescue_initrd(void)
414 {
415 #ifdef CONFIG_BLK_DEV_INITRD
416 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
417 /*
418 * Just like in case of IPL from VM reader we make sure there is a
419 * gap of 4MB between end of kernel and start of initrd.
420 * That way we can also be sure that saving an NSS will succeed,
421 * which however only requires different segments.
422 */
423 if (!INITRD_START || !INITRD_SIZE)
424 return;
425 if (INITRD_START >= min_initrd_addr)
426 return;
427 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
428 INITRD_START = min_initrd_addr;
429 #endif
430 }
431
432 /* Set up boot command line */
append_to_cmdline(size_t (* ipl_data)(char *,size_t))433 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
434 {
435 char *parm, *delim;
436 size_t rc, len;
437
438 len = strlen(boot_command_line);
439
440 delim = boot_command_line + len; /* '\0' character position */
441 parm = boot_command_line + len + 1; /* append right after '\0' */
442
443 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
444 if (rc) {
445 if (*parm == '=')
446 memmove(boot_command_line, parm + 1, rc);
447 else
448 *delim = ' '; /* replace '\0' with space */
449 }
450 }
451
has_ebcdic_char(const char * str)452 static inline int has_ebcdic_char(const char *str)
453 {
454 int i;
455
456 for (i = 0; str[i]; i++)
457 if (str[i] & 0x80)
458 return 1;
459 return 0;
460 }
461
setup_boot_command_line(void)462 static void __init setup_boot_command_line(void)
463 {
464 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
465 /* convert arch command line to ascii if necessary */
466 if (has_ebcdic_char(COMMAND_LINE))
467 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
468 /* copy arch command line */
469 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
470 ARCH_COMMAND_LINE_SIZE);
471
472 /* append IPL PARM data to the boot command line */
473 if (MACHINE_IS_VM)
474 append_to_cmdline(append_ipl_vmparm);
475
476 append_to_cmdline(append_ipl_scpdata);
477 }
478
479 /*
480 * Save ipl parameters, clear bss memory, initialize storage keys
481 * and create a kernel NSS at startup if the SAVESYS= parm is defined
482 */
startup_init(void)483 void __init startup_init(void)
484 {
485 reset_tod_clock();
486 ipl_save_parameters();
487 rescue_initrd();
488 clear_bss_section();
489 ptff_init();
490 init_kernel_storage_key();
491 lockdep_off();
492 setup_lowcore_early();
493 setup_facility_list();
494 detect_machine_type();
495 setup_arch_string();
496 ipl_update_parameters();
497 setup_boot_command_line();
498 create_kernel_nss();
499 detect_diag9c();
500 detect_diag44();
501 detect_machine_facilities();
502 save_vector_registers();
503 setup_topology();
504 sclp_early_detect();
505 lockdep_on();
506 }
507