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Commit | Line | Data |
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ab14de6c HC |
1 | /* |
2 | * arch/s390/kernel/early.c | |
3 | * | |
155af2f9 | 4 | * Copyright IBM Corp. 2007, 2009 |
ab14de6c HC |
5 | * Author(s): Hongjie Yang <hongjie@us.ibm.com>, |
6 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
7 | */ | |
8 | ||
92e6ecf3 | 9 | #include <linux/compiler.h> |
ab14de6c HC |
10 | #include <linux/init.h> |
11 | #include <linux/errno.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/ctype.h> | |
dfd9f7ab | 14 | #include <linux/ftrace.h> |
ab14de6c HC |
15 | #include <linux/lockdep.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/pfn.h> | |
18 | #include <linux/uaccess.h> | |
a0443fbb | 19 | #include <asm/ebcdic.h> |
46b05d26 | 20 | #include <asm/ipl.h> |
ab14de6c HC |
21 | #include <asm/lowcore.h> |
22 | #include <asm/processor.h> | |
23 | #include <asm/sections.h> | |
24 | #include <asm/setup.h> | |
92e6ecf3 | 25 | #include <asm/sysinfo.h> |
ab14de6c HC |
26 | #include <asm/cpcmd.h> |
27 | #include <asm/sclp.h> | |
a806170e | 28 | #include "entry.h" |
ab14de6c HC |
29 | |
30 | /* | |
31 | * Create a Kernel NSS if the SAVESYS= parameter is defined | |
32 | */ | |
a0443fbb | 33 | #define DEFSYS_CMD_SIZE 128 |
ab14de6c HC |
34 | #define SAVESYS_CMD_SIZE 32 |
35 | ||
ab14de6c HC |
36 | char kernel_nss_name[NSS_NAME_SIZE + 1]; |
37 | ||
25097bf1 CE |
38 | static unsigned long machine_flags; |
39 | ||
a0443fbb HB |
40 | static void __init setup_boot_command_line(void); |
41 | ||
b6112ccb MS |
42 | /* |
43 | * Get the TOD clock running. | |
44 | */ | |
45 | static void __init reset_tod_clock(void) | |
46 | { | |
47 | u64 time; | |
48 | ||
49 | if (store_clock(&time) == 0) | |
50 | return; | |
51 | /* TOD clock not running. Set the clock to Unix Epoch. */ | |
52 | if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) | |
53 | disabled_wait(0); | |
54 | ||
55 | sched_clock_base_cc = TOD_UNIX_EPOCH; | |
56 | } | |
a0443fbb | 57 | |
ab14de6c | 58 | #ifdef CONFIG_SHARED_KERNEL |
a0443fbb HB |
59 | int __init savesys_ipl_nss(char *cmd, const int cmdlen); |
60 | ||
61 | asm( | |
62 | " .section .init.text,\"ax\",@progbits\n" | |
63 | " .align 4\n" | |
64 | " .type savesys_ipl_nss, @function\n" | |
65 | "savesys_ipl_nss:\n" | |
66 | #ifdef CONFIG_64BIT | |
67 | " stmg 6,15,48(15)\n" | |
68 | " lgr 14,3\n" | |
69 | " sam31\n" | |
70 | " diag 2,14,0x8\n" | |
71 | " sam64\n" | |
72 | " lgr 2,14\n" | |
73 | " lmg 6,15,48(15)\n" | |
74 | #else | |
75 | " stm 6,15,24(15)\n" | |
76 | " lr 14,3\n" | |
77 | " diag 2,14,0x8\n" | |
78 | " lr 2,14\n" | |
79 | " lm 6,15,24(15)\n" | |
80 | #endif | |
81 | " br 14\n" | |
82 | " .size savesys_ipl_nss, .-savesys_ipl_nss\n"); | |
83 | ||
ab14de6c HC |
84 | static noinline __init void create_kernel_nss(void) |
85 | { | |
86 | unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; | |
87 | #ifdef CONFIG_BLK_DEV_INITRD | |
88 | unsigned int sinitrd_pfn, einitrd_pfn; | |
89 | #endif | |
90 | int response; | |
a0443fbb | 91 | size_t len; |
ab14de6c HC |
92 | char *savesys_ptr; |
93 | char upper_command_line[COMMAND_LINE_SIZE]; | |
94 | char defsys_cmd[DEFSYS_CMD_SIZE]; | |
95 | char savesys_cmd[SAVESYS_CMD_SIZE]; | |
96 | ||
97 | /* Do nothing if we are not running under VM */ | |
98 | if (!MACHINE_IS_VM) | |
99 | return; | |
100 | ||
101 | /* Convert COMMAND_LINE to upper case */ | |
a0443fbb HB |
102 | for (i = 0; i < strlen(boot_command_line); i++) |
103 | upper_command_line[i] = toupper(boot_command_line[i]); | |
ab14de6c HC |
104 | |
105 | savesys_ptr = strstr(upper_command_line, "SAVESYS="); | |
106 | ||
107 | if (!savesys_ptr) | |
108 | return; | |
109 | ||
110 | savesys_ptr += 8; /* Point to the beginning of the NSS name */ | |
111 | for (i = 0; i < NSS_NAME_SIZE; i++) { | |
112 | if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') | |
113 | break; | |
114 | kernel_nss_name[i] = savesys_ptr[i]; | |
115 | } | |
116 | ||
117 | stext_pfn = PFN_DOWN(__pa(&_stext)); | |
118 | eshared_pfn = PFN_DOWN(__pa(&_eshared)); | |
119 | end_pfn = PFN_UP(__pa(&_end)); | |
120 | min_size = end_pfn << 2; | |
121 | ||
122 | sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", | |
123 | kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, | |
124 | eshared_pfn, end_pfn); | |
125 | ||
126 | #ifdef CONFIG_BLK_DEV_INITRD | |
127 | if (INITRD_START && INITRD_SIZE) { | |
128 | sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); | |
129 | einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); | |
130 | min_size = einitrd_pfn << 2; | |
131 | sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, | |
132 | sinitrd_pfn, einitrd_pfn); | |
133 | } | |
134 | #endif | |
135 | ||
a0443fbb HB |
136 | sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", |
137 | defsys_cmd, min_size); | |
ab14de6c HC |
138 | sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", |
139 | kernel_nss_name, kernel_nss_name); | |
140 | ||
141 | __cpcmd(defsys_cmd, NULL, 0, &response); | |
142 | ||
583b33bc HY |
143 | if (response != 0) { |
144 | kernel_nss_name[0] = '\0'; | |
ab14de6c | 145 | return; |
583b33bc | 146 | } |
ab14de6c | 147 | |
a0443fbb HB |
148 | len = strlen(savesys_cmd); |
149 | ASCEBC(savesys_cmd, len); | |
150 | response = savesys_ipl_nss(savesys_cmd, len); | |
ab14de6c | 151 | |
a0443fbb HB |
152 | /* On success: response is equal to the command size, |
153 | * max SAVESYS_CMD_SIZE | |
154 | * On error: response contains the numeric portion of cp error message. | |
155 | * for SAVESYS it will be >= 263 | |
156 | */ | |
157 | if (response > SAVESYS_CMD_SIZE) { | |
583b33bc | 158 | kernel_nss_name[0] = '\0'; |
ab14de6c | 159 | return; |
583b33bc | 160 | } |
ab14de6c | 161 | |
a0443fbb HB |
162 | /* re-setup boot command line with new ipl vm parms */ |
163 | ipl_update_parameters(); | |
164 | setup_boot_command_line(); | |
165 | ||
ab14de6c HC |
166 | ipl_flags = IPL_NSS_VALID; |
167 | } | |
168 | ||
169 | #else /* CONFIG_SHARED_KERNEL */ | |
170 | ||
171 | static inline void create_kernel_nss(void) { } | |
172 | ||
173 | #endif /* CONFIG_SHARED_KERNEL */ | |
174 | ||
175 | /* | |
176 | * Clear bss memory | |
177 | */ | |
178 | static noinline __init void clear_bss_section(void) | |
179 | { | |
229d9c6d | 180 | memset(__bss_start, 0, __bss_stop - __bss_start); |
ab14de6c HC |
181 | } |
182 | ||
183 | /* | |
184 | * Initialize storage key for kernel pages | |
185 | */ | |
186 | static noinline __init void init_kernel_storage_key(void) | |
187 | { | |
188 | unsigned long end_pfn, init_pfn; | |
189 | ||
190 | end_pfn = PFN_UP(__pa(&_end)); | |
191 | ||
192 | for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) | |
193 | page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); | |
194 | } | |
195 | ||
92e6ecf3 CB |
196 | static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); |
197 | ||
ab14de6c HC |
198 | static noinline __init void detect_machine_type(void) |
199 | { | |
92e6ecf3 CB |
200 | /* No VM information? Looks like LPAR */ |
201 | if (stsi(&vmms, 3, 2, 2) == -ENOSYS) | |
202 | return; | |
203 | if (!vmms.count) | |
204 | return; | |
ab14de6c | 205 | |
92e6ecf3 CB |
206 | /* Running under KVM? If not we assume z/VM */ |
207 | if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) | |
2e5061e4 | 208 | machine_flags |= MACHINE_FLAG_KVM; |
92e6ecf3 CB |
209 | else |
210 | machine_flags |= MACHINE_FLAG_VM; | |
677c1dd7 HB |
211 | |
212 | /* Store machine flags for setting up lowcore early */ | |
213 | S390_lowcore.machine_flags = machine_flags; | |
ab14de6c HC |
214 | } |
215 | ||
5f954c34 | 216 | static __init void early_pgm_check_handler(void) |
ab14de6c HC |
217 | { |
218 | unsigned long addr; | |
219 | const struct exception_table_entry *fixup; | |
220 | ||
221 | addr = S390_lowcore.program_old_psw.addr; | |
222 | fixup = search_exception_tables(addr & PSW_ADDR_INSN); | |
223 | if (!fixup) | |
224 | disabled_wait(0); | |
225 | S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; | |
226 | } | |
227 | ||
5f954c34 | 228 | static noinline __init void setup_lowcore_early(void) |
ab14de6c HC |
229 | { |
230 | psw_t psw; | |
231 | ||
232 | psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; | |
233 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; | |
234 | S390_lowcore.external_new_psw = psw; | |
235 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; | |
236 | S390_lowcore.program_new_psw = psw; | |
237 | s390_base_pgm_handler_fn = early_pgm_check_handler; | |
238 | } | |
239 | ||
53492b1d GS |
240 | static noinline __init void setup_hpage(void) |
241 | { | |
242 | #ifndef CONFIG_DEBUG_PAGEALLOC | |
243 | unsigned int facilities; | |
244 | ||
245 | facilities = stfl(); | |
246 | if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) | |
247 | return; | |
248 | machine_flags |= MACHINE_FLAG_HPAGE; | |
249 | __ctl_set_bit(0, 23); | |
250 | #endif | |
251 | } | |
252 | ||
2e5061e4 HC |
253 | static __init void detect_mvpg(void) |
254 | { | |
255 | #ifndef CONFIG_64BIT | |
256 | int rc; | |
257 | ||
258 | asm volatile( | |
259 | " la 0,0\n" | |
260 | " mvpg %2,%2\n" | |
261 | "0: la %0,0\n" | |
262 | "1:\n" | |
263 | EX_TABLE(0b,1b) | |
264 | : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); | |
265 | if (!rc) | |
266 | machine_flags |= MACHINE_FLAG_MVPG; | |
267 | #endif | |
268 | } | |
269 | ||
270 | static __init void detect_ieee(void) | |
271 | { | |
272 | #ifndef CONFIG_64BIT | |
273 | int rc, tmp; | |
274 | ||
275 | asm volatile( | |
276 | " efpc %1,0\n" | |
277 | "0: la %0,0\n" | |
278 | "1:\n" | |
279 | EX_TABLE(0b,1b) | |
280 | : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); | |
281 | if (!rc) | |
282 | machine_flags |= MACHINE_FLAG_IEEE; | |
283 | #endif | |
284 | } | |
285 | ||
286 | static __init void detect_csp(void) | |
287 | { | |
288 | #ifndef CONFIG_64BIT | |
289 | int rc; | |
290 | ||
291 | asm volatile( | |
292 | " la 0,0\n" | |
293 | " la 1,0\n" | |
294 | " la 2,4\n" | |
295 | " csp 0,2\n" | |
296 | "0: la %0,0\n" | |
297 | "1:\n" | |
298 | EX_TABLE(0b,1b) | |
299 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); | |
300 | if (!rc) | |
301 | machine_flags |= MACHINE_FLAG_CSP; | |
302 | #endif | |
303 | } | |
304 | ||
305 | static __init void detect_diag9c(void) | |
306 | { | |
307 | unsigned int cpu_address; | |
308 | int rc; | |
309 | ||
310 | cpu_address = stap(); | |
311 | asm volatile( | |
312 | " diag %2,0,0x9c\n" | |
313 | "0: la %0,0\n" | |
314 | "1:\n" | |
315 | EX_TABLE(0b,1b) | |
316 | : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); | |
317 | if (!rc) | |
318 | machine_flags |= MACHINE_FLAG_DIAG9C; | |
319 | } | |
320 | ||
321 | static __init void detect_diag44(void) | |
322 | { | |
323 | #ifdef CONFIG_64BIT | |
324 | int rc; | |
325 | ||
326 | asm volatile( | |
327 | " diag 0,0,0x44\n" | |
328 | "0: la %0,0\n" | |
329 | "1:\n" | |
330 | EX_TABLE(0b,1b) | |
331 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); | |
332 | if (!rc) | |
333 | machine_flags |= MACHINE_FLAG_DIAG44; | |
334 | #endif | |
335 | } | |
336 | ||
337 | static __init void detect_machine_facilities(void) | |
338 | { | |
339 | #ifdef CONFIG_64BIT | |
340 | unsigned int facilities; | |
341 | ||
342 | facilities = stfl(); | |
343 | if (facilities & (1 << 28)) | |
344 | machine_flags |= MACHINE_FLAG_IDTE; | |
53492b1d GS |
345 | if (facilities & (1 << 23)) |
346 | machine_flags |= MACHINE_FLAG_PFMF; | |
2e5061e4 HC |
347 | if (facilities & (1 << 4)) |
348 | machine_flags |= MACHINE_FLAG_MVCOS; | |
349 | #endif | |
350 | } | |
351 | ||
761cdf6a HC |
352 | static __init void rescue_initrd(void) |
353 | { | |
354 | #ifdef CONFIG_BLK_DEV_INITRD | |
355 | /* | |
356 | * Move the initrd right behind the bss section in case it starts | |
357 | * within the bss section. So we don't overwrite it when the bss | |
358 | * section gets cleared. | |
359 | */ | |
360 | if (!INITRD_START || !INITRD_SIZE) | |
361 | return; | |
362 | if (INITRD_START >= (unsigned long) __bss_stop) | |
363 | return; | |
364 | memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); | |
365 | INITRD_START = (unsigned long) __bss_stop; | |
366 | #endif | |
367 | } | |
368 | ||
a0443fbb HB |
369 | /* Set up boot command line */ |
370 | static void __init setup_boot_command_line(void) | |
371 | { | |
372 | char *parm = NULL; | |
373 | ||
374 | /* copy arch command line */ | |
375 | strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); | |
a0443fbb HB |
376 | |
377 | /* append IPL PARM data to the boot command line */ | |
378 | if (MACHINE_IS_VM) { | |
379 | parm = boot_command_line + strlen(boot_command_line); | |
380 | *parm++ = ' '; | |
381 | get_ipl_vmparm(parm); | |
382 | if (parm[0] == '=') | |
383 | memmove(boot_command_line, parm + 1, strlen(parm)); | |
384 | } | |
385 | } | |
386 | ||
387 | ||
ab14de6c HC |
388 | /* |
389 | * Save ipl parameters, clear bss memory, initialize storage keys | |
390 | * and create a kernel NSS at startup if the SAVESYS= parm is defined | |
391 | */ | |
392 | void __init startup_init(void) | |
393 | { | |
b6112ccb | 394 | reset_tod_clock(); |
ab14de6c | 395 | ipl_save_parameters(); |
761cdf6a | 396 | rescue_initrd(); |
ab14de6c HC |
397 | clear_bss_section(); |
398 | init_kernel_storage_key(); | |
399 | lockdep_init(); | |
400 | lockdep_off(); | |
ab14de6c HC |
401 | sort_main_extable(); |
402 | setup_lowcore_early(); | |
a0443fbb HB |
403 | detect_machine_type(); |
404 | ipl_update_parameters(); | |
405 | setup_boot_command_line(); | |
406 | create_kernel_nss(); | |
2e5061e4 HC |
407 | detect_mvpg(); |
408 | detect_ieee(); | |
409 | detect_csp(); | |
410 | detect_diag9c(); | |
411 | detect_diag44(); | |
412 | detect_machine_facilities(); | |
53492b1d | 413 | setup_hpage(); |
83119ad4 | 414 | sclp_facilities_detect(); |
23d17421 | 415 | detect_memory_layout(memory_chunk); |
25097bf1 | 416 | S390_lowcore.machine_flags = machine_flags; |
dfd9f7ab HC |
417 | #ifdef CONFIG_DYNAMIC_FTRACE |
418 | S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; | |
419 | #endif | |
ab14de6c HC |
420 | lockdep_on(); |
421 | } |