Commit | Line | Data |
---|---|---|
ab14de6c | 1 | /* |
155af2f9 | 2 | * Copyright IBM Corp. 2007, 2009 |
ab14de6c HC |
3 | * Author(s): Hongjie Yang <hongjie@us.ibm.com>, |
4 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
5 | */ | |
6 | ||
11af97e1 HB |
7 | #define KMSG_COMPONENT "setup" |
8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
9 | ||
92e6ecf3 | 10 | #include <linux/compiler.h> |
ab14de6c HC |
11 | #include <linux/init.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/ctype.h> | |
dfd9f7ab | 15 | #include <linux/ftrace.h> |
ab14de6c HC |
16 | #include <linux/lockdep.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/pfn.h> | |
19 | #include <linux/uaccess.h> | |
11af97e1 | 20 | #include <linux/kernel.h> |
a0443fbb | 21 | #include <asm/ebcdic.h> |
46b05d26 | 22 | #include <asm/ipl.h> |
ab14de6c HC |
23 | #include <asm/lowcore.h> |
24 | #include <asm/processor.h> | |
25 | #include <asm/sections.h> | |
26 | #include <asm/setup.h> | |
92e6ecf3 | 27 | #include <asm/sysinfo.h> |
ab14de6c HC |
28 | #include <asm/cpcmd.h> |
29 | #include <asm/sclp.h> | |
a0616cde | 30 | #include <asm/facility.h> |
a806170e | 31 | #include "entry.h" |
ab14de6c HC |
32 | |
33 | /* | |
34 | * Create a Kernel NSS if the SAVESYS= parameter is defined | |
35 | */ | |
a0443fbb | 36 | #define DEFSYS_CMD_SIZE 128 |
ab14de6c HC |
37 | #define SAVESYS_CMD_SIZE 32 |
38 | ||
ab14de6c HC |
39 | char kernel_nss_name[NSS_NAME_SIZE + 1]; |
40 | ||
a0443fbb HB |
41 | static void __init setup_boot_command_line(void); |
42 | ||
b6112ccb MS |
43 | /* |
44 | * Get the TOD clock running. | |
45 | */ | |
46 | static void __init reset_tod_clock(void) | |
47 | { | |
48 | u64 time; | |
49 | ||
50 | if (store_clock(&time) == 0) | |
51 | return; | |
52 | /* TOD clock not running. Set the clock to Unix Epoch. */ | |
53 | if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) | |
54 | disabled_wait(0); | |
55 | ||
56 | sched_clock_base_cc = TOD_UNIX_EPOCH; | |
b89031e0 | 57 | S390_lowcore.last_update_clock = sched_clock_base_cc; |
b6112ccb | 58 | } |
a0443fbb | 59 | |
ab14de6c | 60 | #ifdef CONFIG_SHARED_KERNEL |
a0443fbb HB |
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" | |
18764463 HC |
84 | " .size savesys_ipl_nss, .-savesys_ipl_nss\n" |
85 | " .previous\n"); | |
a0443fbb | 86 | |
684d2fd4 HB |
87 | static __initdata char upper_command_line[COMMAND_LINE_SIZE]; |
88 | ||
ab14de6c HC |
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; | |
69ac43b0 | 96 | int hlen; |
a0443fbb | 97 | size_t len; |
ab14de6c | 98 | char *savesys_ptr; |
ab14de6c HC |
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 */ | |
a0443fbb HB |
107 | for (i = 0; i < strlen(boot_command_line); i++) |
108 | upper_command_line[i] = toupper(boot_command_line[i]); | |
ab14de6c HC |
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 | ||
69ac43b0 CL |
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); | |
ab14de6c HC |
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; | |
69ac43b0 CL |
137 | hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, |
138 | " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); | |
ab14de6c HC |
139 | } |
140 | #endif | |
141 | ||
69ac43b0 CL |
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'; | |
894e491e HC |
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'; | |
ab14de6c HC |
148 | |
149 | __cpcmd(defsys_cmd, NULL, 0, &response); | |
150 | ||
583b33bc | 151 | if (response != 0) { |
11af97e1 HB |
152 | pr_err("Defining the Linux kernel NSS failed with rc=%d\n", |
153 | response); | |
583b33bc | 154 | kernel_nss_name[0] = '\0'; |
ab14de6c | 155 | return; |
583b33bc | 156 | } |
ab14de6c | 157 | |
a0443fbb HB |
158 | len = strlen(savesys_cmd); |
159 | ASCEBC(savesys_cmd, len); | |
160 | response = savesys_ipl_nss(savesys_cmd, len); | |
ab14de6c | 161 | |
a0443fbb HB |
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 | |
11af97e1 | 166 | * for missing privilege class, it will be 1 |
a0443fbb | 167 | */ |
11af97e1 HB |
168 | if (response > SAVESYS_CMD_SIZE || response == 1) { |
169 | pr_err("Saving the Linux kernel NSS failed with rc=%d\n", | |
170 | response); | |
583b33bc | 171 | kernel_nss_name[0] = '\0'; |
ab14de6c | 172 | return; |
583b33bc | 173 | } |
ab14de6c | 174 | |
b89031e0 MS |
175 | /* re-initialize cputime accounting. */ |
176 | sched_clock_base_cc = get_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 | ||
a0443fbb HB |
183 | /* re-setup boot command line with new ipl vm parms */ |
184 | ipl_update_parameters(); | |
185 | setup_boot_command_line(); | |
186 | ||
ab14de6c HC |
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 | { | |
229d9c6d | 201 | memset(__bss_start, 0, __bss_stop - __bss_start); |
ab14de6c HC |
202 | } |
203 | ||
204 | /* | |
205 | * Initialize storage key for kernel pages | |
206 | */ | |
207 | static noinline __init void init_kernel_storage_key(void) | |
208 | { | |
209 | unsigned long end_pfn, init_pfn; | |
210 | ||
211 | end_pfn = PFN_UP(__pa(&_end)); | |
212 | ||
213 | for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) | |
e2b8d7af MS |
214 | page_set_storage_key(init_pfn << PAGE_SHIFT, |
215 | PAGE_DEFAULT_KEY, 0); | |
ab14de6c HC |
216 | } |
217 | ||
92e6ecf3 CB |
218 | static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); |
219 | ||
ab14de6c HC |
220 | static noinline __init void detect_machine_type(void) |
221 | { | |
27d71602 MS |
222 | /* Check current-configuration-level */ |
223 | if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { | |
224 | S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; | |
92e6ecf3 | 225 | return; |
27d71602 MS |
226 | } |
227 | /* Get virtual-machine cpu information. */ | |
228 | if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) | |
92e6ecf3 | 229 | return; |
ab14de6c | 230 | |
92e6ecf3 CB |
231 | /* Running under KVM? If not we assume z/VM */ |
232 | if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) | |
d3135e0c | 233 | S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; |
92e6ecf3 | 234 | else |
d3135e0c | 235 | S390_lowcore.machine_flags |= MACHINE_FLAG_VM; |
ab14de6c HC |
236 | } |
237 | ||
a3415703 | 238 | static void early_pgm_check_handler(void) |
ab14de6c HC |
239 | { |
240 | unsigned long addr; | |
241 | const struct exception_table_entry *fixup; | |
242 | ||
243 | addr = S390_lowcore.program_old_psw.addr; | |
244 | fixup = search_exception_tables(addr & PSW_ADDR_INSN); | |
245 | if (!fixup) | |
246 | disabled_wait(0); | |
247 | S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; | |
248 | } | |
249 | ||
5f954c34 | 250 | static noinline __init void setup_lowcore_early(void) |
ab14de6c HC |
251 | { |
252 | psw_t psw; | |
253 | ||
b50511e4 | 254 | psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; |
ab14de6c HC |
255 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; |
256 | S390_lowcore.external_new_psw = psw; | |
257 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; | |
258 | S390_lowcore.program_new_psw = psw; | |
259 | s390_base_pgm_handler_fn = early_pgm_check_handler; | |
260 | } | |
261 | ||
14375bc4 MS |
262 | static noinline __init void setup_facility_list(void) |
263 | { | |
3ab121ab MH |
264 | stfle(S390_lowcore.stfle_fac_list, |
265 | ARRAY_SIZE(S390_lowcore.stfle_fac_list)); | |
14375bc4 MS |
266 | } |
267 | ||
53492b1d GS |
268 | static noinline __init void setup_hpage(void) |
269 | { | |
270 | #ifndef CONFIG_DEBUG_PAGEALLOC | |
14375bc4 | 271 | if (!test_facility(2) || !test_facility(8)) |
53492b1d | 272 | return; |
d3135e0c | 273 | S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; |
53492b1d GS |
274 | __ctl_set_bit(0, 23); |
275 | #endif | |
276 | } | |
277 | ||
2e5061e4 HC |
278 | static __init void detect_mvpg(void) |
279 | { | |
280 | #ifndef CONFIG_64BIT | |
281 | int rc; | |
282 | ||
283 | asm volatile( | |
284 | " la 0,0\n" | |
285 | " mvpg %2,%2\n" | |
286 | "0: la %0,0\n" | |
287 | "1:\n" | |
288 | EX_TABLE(0b,1b) | |
289 | : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); | |
290 | if (!rc) | |
d3135e0c | 291 | S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; |
2e5061e4 HC |
292 | #endif |
293 | } | |
294 | ||
295 | static __init void detect_ieee(void) | |
296 | { | |
297 | #ifndef CONFIG_64BIT | |
298 | int rc, tmp; | |
299 | ||
300 | asm volatile( | |
301 | " efpc %1,0\n" | |
302 | "0: la %0,0\n" | |
303 | "1:\n" | |
304 | EX_TABLE(0b,1b) | |
305 | : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); | |
306 | if (!rc) | |
d3135e0c | 307 | S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; |
2e5061e4 HC |
308 | #endif |
309 | } | |
310 | ||
311 | static __init void detect_csp(void) | |
312 | { | |
313 | #ifndef CONFIG_64BIT | |
314 | int rc; | |
315 | ||
316 | asm volatile( | |
317 | " la 0,0\n" | |
318 | " la 1,0\n" | |
319 | " la 2,4\n" | |
320 | " csp 0,2\n" | |
321 | "0: la %0,0\n" | |
322 | "1:\n" | |
323 | EX_TABLE(0b,1b) | |
324 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); | |
325 | if (!rc) | |
d3135e0c | 326 | S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; |
2e5061e4 HC |
327 | #endif |
328 | } | |
329 | ||
330 | static __init void detect_diag9c(void) | |
331 | { | |
332 | unsigned int cpu_address; | |
333 | int rc; | |
334 | ||
335 | cpu_address = stap(); | |
336 | asm volatile( | |
337 | " diag %2,0,0x9c\n" | |
338 | "0: la %0,0\n" | |
339 | "1:\n" | |
340 | EX_TABLE(0b,1b) | |
341 | : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); | |
342 | if (!rc) | |
d3135e0c | 343 | S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; |
2e5061e4 HC |
344 | } |
345 | ||
346 | static __init void detect_diag44(void) | |
347 | { | |
348 | #ifdef CONFIG_64BIT | |
349 | int rc; | |
350 | ||
351 | asm volatile( | |
352 | " diag 0,0,0x44\n" | |
353 | "0: la %0,0\n" | |
354 | "1:\n" | |
355 | EX_TABLE(0b,1b) | |
356 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); | |
357 | if (!rc) | |
d3135e0c | 358 | S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; |
2e5061e4 HC |
359 | #endif |
360 | } | |
361 | ||
362 | static __init void detect_machine_facilities(void) | |
363 | { | |
364 | #ifdef CONFIG_64BIT | |
14375bc4 | 365 | if (test_facility(3)) |
d3135e0c | 366 | S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; |
14375bc4 | 367 | if (test_facility(8)) |
d3135e0c | 368 | S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; |
9186d7a9 HC |
369 | if (test_facility(11)) |
370 | S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; | |
14375bc4 | 371 | if (test_facility(27)) |
d3135e0c | 372 | S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; |
14375bc4 | 373 | if (test_facility(40)) |
cd3b70f5 | 374 | S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; |
2e5061e4 HC |
375 | #endif |
376 | } | |
377 | ||
761cdf6a HC |
378 | static __init void rescue_initrd(void) |
379 | { | |
380 | #ifdef CONFIG_BLK_DEV_INITRD | |
27e7318c | 381 | unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); |
761cdf6a | 382 | /* |
27e7318c HC |
383 | * Just like in case of IPL from VM reader we make sure there is a |
384 | * gap of 4MB between end of kernel and start of initrd. | |
385 | * That way we can also be sure that saving an NSS will succeed, | |
386 | * which however only requires different segments. | |
761cdf6a HC |
387 | */ |
388 | if (!INITRD_START || !INITRD_SIZE) | |
389 | return; | |
27e7318c | 390 | if (INITRD_START >= min_initrd_addr) |
761cdf6a | 391 | return; |
27e7318c HC |
392 | memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); |
393 | INITRD_START = min_initrd_addr; | |
761cdf6a HC |
394 | #endif |
395 | } | |
396 | ||
a0443fbb | 397 | /* Set up boot command line */ |
684d2fd4 | 398 | static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) |
a0443fbb | 399 | { |
684d2fd4 HB |
400 | char *parm, *delim; |
401 | size_t rc, len; | |
402 | ||
403 | len = strlen(boot_command_line); | |
a0443fbb | 404 | |
684d2fd4 HB |
405 | delim = boot_command_line + len; /* '\0' character position */ |
406 | parm = boot_command_line + len + 1; /* append right after '\0' */ | |
407 | ||
408 | rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); | |
409 | if (rc) { | |
410 | if (*parm == '=') | |
411 | memmove(boot_command_line, parm + 1, rc); | |
412 | else | |
413 | *delim = ' '; /* replace '\0' with space */ | |
414 | } | |
415 | } | |
416 | ||
1fb81057 | 417 | static inline int has_ebcdic_char(const char *str) |
684d2fd4 | 418 | { |
61fd330d MS |
419 | int i; |
420 | ||
1fb81057 MH |
421 | for (i = 0; str[i]; i++) |
422 | if (str[i] & 0x80) | |
423 | return 1; | |
424 | return 0; | |
425 | } | |
61fd330d | 426 | |
1fb81057 MH |
427 | static void __init setup_boot_command_line(void) |
428 | { | |
429 | COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; | |
430 | /* convert arch command line to ascii if necessary */ | |
431 | if (has_ebcdic_char(COMMAND_LINE)) | |
432 | EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); | |
a0443fbb | 433 | /* copy arch command line */ |
61fd330d MS |
434 | strlcpy(boot_command_line, strstrip(COMMAND_LINE), |
435 | ARCH_COMMAND_LINE_SIZE); | |
a0443fbb HB |
436 | |
437 | /* append IPL PARM data to the boot command line */ | |
684d2fd4 HB |
438 | if (MACHINE_IS_VM) |
439 | append_to_cmdline(append_ipl_vmparm); | |
440 | ||
441 | append_to_cmdline(append_ipl_scpdata); | |
a0443fbb HB |
442 | } |
443 | ||
444 | ||
ab14de6c HC |
445 | /* |
446 | * Save ipl parameters, clear bss memory, initialize storage keys | |
447 | * and create a kernel NSS at startup if the SAVESYS= parm is defined | |
448 | */ | |
449 | void __init startup_init(void) | |
450 | { | |
b6112ccb | 451 | reset_tod_clock(); |
ab14de6c | 452 | ipl_save_parameters(); |
761cdf6a | 453 | rescue_initrd(); |
ab14de6c HC |
454 | clear_bss_section(); |
455 | init_kernel_storage_key(); | |
456 | lockdep_init(); | |
457 | lockdep_off(); | |
ab14de6c HC |
458 | sort_main_extable(); |
459 | setup_lowcore_early(); | |
14375bc4 | 460 | setup_facility_list(); |
a0443fbb HB |
461 | detect_machine_type(); |
462 | ipl_update_parameters(); | |
463 | setup_boot_command_line(); | |
464 | create_kernel_nss(); | |
2e5061e4 HC |
465 | detect_mvpg(); |
466 | detect_ieee(); | |
467 | detect_csp(); | |
468 | detect_diag9c(); | |
469 | detect_diag44(); | |
470 | detect_machine_facilities(); | |
53492b1d | 471 | setup_hpage(); |
83119ad4 | 472 | sclp_facilities_detect(); |
23d17421 | 473 | detect_memory_layout(memory_chunk); |
dfd9f7ab HC |
474 | #ifdef CONFIG_DYNAMIC_FTRACE |
475 | S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; | |
476 | #endif | |
ab14de6c HC |
477 | lockdep_on(); |
478 | } |