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