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8
9#define KMSG_COMPONENT "setup"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/compiler.h>
13#include <linux/init.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/ctype.h>
17#include <linux/ftrace.h>
18#include <linux/lockdep.h>
19#include <linux/module.h>
20#include <linux/pfn.h>
21#include <linux/uaccess.h>
22#include <linux/kernel.h>
23#include <asm/ebcdic.h>
24#include <asm/ipl.h>
25#include <asm/lowcore.h>
26#include <asm/processor.h>
27#include <asm/sections.h>
28#include <asm/setup.h>
29#include <asm/sysinfo.h>
30#include <asm/cpcmd.h>
31#include <asm/sclp.h>
32#include "entry.h"
33
34
35
36
37#define DEFSYS_CMD_SIZE 128
38#define SAVESYS_CMD_SIZE 32
39
40char kernel_nss_name[NSS_NAME_SIZE + 1];
41
42static void __init setup_boot_command_line(void);
43
44
45
46
47static void __init reset_tod_clock(void)
48{
49 u64 time;
50
51 if (store_clock(&time) == 0)
52 return;
53
54 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
55 disabled_wait(0);
56
57 sched_clock_base_cc = TOD_UNIX_EPOCH;
58 S390_lowcore.last_update_clock = sched_clock_base_cc;
59}
60
61#ifdef CONFIG_SHARED_KERNEL
62int __init savesys_ipl_nss(char *cmd, const int cmdlen);
63
64asm(
65 " .section .init.text,\"ax\",@progbits\n"
66 " .align 4\n"
67 " .type savesys_ipl_nss, @function\n"
68 "savesys_ipl_nss:\n"
69#ifdef CONFIG_64BIT
70 " stmg 6,15,48(15)\n"
71 " lgr 14,3\n"
72 " sam31\n"
73 " diag 2,14,0x8\n"
74 " sam64\n"
75 " lgr 2,14\n"
76 " lmg 6,15,48(15)\n"
77#else
78 " stm 6,15,24(15)\n"
79 " lr 14,3\n"
80 " diag 2,14,0x8\n"
81 " lr 2,14\n"
82 " lm 6,15,24(15)\n"
83#endif
84 " br 14\n"
85 " .size savesys_ipl_nss, .-savesys_ipl_nss\n");
86
87static __initdata char upper_command_line[COMMAND_LINE_SIZE];
88
89static 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 size_t len;
97 char *savesys_ptr;
98 char defsys_cmd[DEFSYS_CMD_SIZE];
99 char savesys_cmd[SAVESYS_CMD_SIZE];
100
101
102 if (!MACHINE_IS_VM)
103 return;
104
105
106 for (i = 0; i < strlen(boot_command_line); i++)
107 upper_command_line[i] = toupper(boot_command_line[i]);
108
109 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
110
111 if (!savesys_ptr)
112 return;
113
114 savesys_ptr += 8;
115 for (i = 0; i < NSS_NAME_SIZE; i++) {
116 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
117 break;
118 kernel_nss_name[i] = savesys_ptr[i];
119 }
120
121 stext_pfn = PFN_DOWN(__pa(&_stext));
122 eshared_pfn = PFN_DOWN(__pa(&_eshared));
123 end_pfn = PFN_UP(__pa(&_end));
124 min_size = end_pfn << 2;
125
126 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
127 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
128 eshared_pfn, end_pfn);
129
130#ifdef CONFIG_BLK_DEV_INITRD
131 if (INITRD_START && INITRD_SIZE) {
132 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
133 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
134 min_size = einitrd_pfn << 2;
135 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
136 sinitrd_pfn, einitrd_pfn);
137 }
138#endif
139
140 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
141 defsys_cmd, min_size);
142 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
143 kernel_nss_name, kernel_nss_name);
144
145 __cpcmd(defsys_cmd, NULL, 0, &response);
146
147 if (response != 0) {
148 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
149 response);
150 kernel_nss_name[0] = '\0';
151 return;
152 }
153
154 len = strlen(savesys_cmd);
155 ASCEBC(savesys_cmd, len);
156 response = savesys_ipl_nss(savesys_cmd, len);
157
158
159
160
161
162
163
164 if (response > SAVESYS_CMD_SIZE || response == 1) {
165 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
166 response);
167 kernel_nss_name[0] = '\0';
168 return;
169 }
170
171
172 sched_clock_base_cc = get_clock();
173 S390_lowcore.last_update_clock = sched_clock_base_cc;
174 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
175 S390_lowcore.user_timer = 0;
176 S390_lowcore.system_timer = 0;
177 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
178
179
180 ipl_update_parameters();
181 setup_boot_command_line();
182
183 ipl_flags = IPL_NSS_VALID;
184}
185
186#else
187
188static inline void create_kernel_nss(void) { }
189
190#endif
191
192
193
194
195static noinline __init void clear_bss_section(void)
196{
197 memset(__bss_start, 0, __bss_stop - __bss_start);
198}
199
200
201
202
203static noinline __init void init_kernel_storage_key(void)
204{
205 unsigned long end_pfn, init_pfn;
206
207 end_pfn = PFN_UP(__pa(&_end));
208
209 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
210 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
211}
212
213static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
214
215static noinline __init void detect_machine_type(void)
216{
217
218 if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
219 return;
220 if (!vmms.count)
221 return;
222
223
224 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
225 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
226 else
227 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
228}
229
230static __init void early_pgm_check_handler(void)
231{
232 unsigned long addr;
233 const struct exception_table_entry *fixup;
234
235 addr = S390_lowcore.program_old_psw.addr;
236 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
237 if (!fixup)
238 disabled_wait(0);
239 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
240}
241
242static noinline __init void setup_lowcore_early(void)
243{
244 psw_t psw;
245
246 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
247 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
248 S390_lowcore.external_new_psw = psw;
249 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
250 S390_lowcore.program_new_psw = psw;
251 s390_base_pgm_handler_fn = early_pgm_check_handler;
252}
253
254static noinline __init void setup_hpage(void)
255{
256#ifndef CONFIG_DEBUG_PAGEALLOC
257 unsigned int facilities;
258
259 facilities = stfl();
260 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
261 return;
262 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
263 __ctl_set_bit(0, 23);
264#endif
265}
266
267static __init void detect_mvpg(void)
268{
269#ifndef CONFIG_64BIT
270 int rc;
271
272 asm volatile(
273 " la 0,0\n"
274 " mvpg %2,%2\n"
275 "0: la %0,0\n"
276 "1:\n"
277 EX_TABLE(0b,1b)
278 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
279 if (!rc)
280 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
281#endif
282}
283
284static __init void detect_ieee(void)
285{
286#ifndef CONFIG_64BIT
287 int rc, tmp;
288
289 asm volatile(
290 " efpc %1,0\n"
291 "0: la %0,0\n"
292 "1:\n"
293 EX_TABLE(0b,1b)
294 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
295 if (!rc)
296 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
297#endif
298}
299
300static __init void detect_csp(void)
301{
302#ifndef CONFIG_64BIT
303 int rc;
304
305 asm volatile(
306 " la 0,0\n"
307 " la 1,0\n"
308 " la 2,4\n"
309 " csp 0,2\n"
310 "0: la %0,0\n"
311 "1:\n"
312 EX_TABLE(0b,1b)
313 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
314 if (!rc)
315 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
316#endif
317}
318
319static __init void detect_diag9c(void)
320{
321 unsigned int cpu_address;
322 int rc;
323
324 cpu_address = stap();
325 asm volatile(
326 " diag %2,0,0x9c\n"
327 "0: la %0,0\n"
328 "1:\n"
329 EX_TABLE(0b,1b)
330 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
331 if (!rc)
332 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
333}
334
335static __init void detect_diag44(void)
336{
337#ifdef CONFIG_64BIT
338 int rc;
339
340 asm volatile(
341 " diag 0,0,0x44\n"
342 "0: la %0,0\n"
343 "1:\n"
344 EX_TABLE(0b,1b)
345 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
346 if (!rc)
347 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
348#endif
349}
350
351static __init void detect_machine_facilities(void)
352{
353#ifdef CONFIG_64BIT
354 unsigned int facilities;
355
356 facilities = stfl();
357 if (facilities & (1 << 28))
358 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
359 if (facilities & (1 << 23))
360 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
361 if (facilities & (1 << 4))
362 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
363#endif
364}
365
366static __init void rescue_initrd(void)
367{
368#ifdef CONFIG_BLK_DEV_INITRD
369
370
371
372
373
374 if (!INITRD_START || !INITRD_SIZE)
375 return;
376 if (INITRD_START >= (unsigned long) __bss_stop)
377 return;
378 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
379 INITRD_START = (unsigned long) __bss_stop;
380#endif
381}
382
383
384static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
385{
386 char *parm, *delim;
387 size_t rc, len;
388
389 len = strlen(boot_command_line);
390
391 delim = boot_command_line + len;
392 parm = boot_command_line + len + 1;
393
394 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
395 if (rc) {
396 if (*parm == '=')
397 memmove(boot_command_line, parm + 1, rc);
398 else
399 *delim = ' ';
400 }
401}
402
403static void __init setup_boot_command_line(void)
404{
405
406 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
407
408
409 if (MACHINE_IS_VM)
410 append_to_cmdline(append_ipl_vmparm);
411
412 append_to_cmdline(append_ipl_scpdata);
413}
414
415
416
417
418
419
420void __init startup_init(void)
421{
422 reset_tod_clock();
423 ipl_save_parameters();
424 rescue_initrd();
425 clear_bss_section();
426 init_kernel_storage_key();
427 lockdep_init();
428 lockdep_off();
429 sort_main_extable();
430 setup_lowcore_early();
431 detect_machine_type();
432 ipl_update_parameters();
433 setup_boot_command_line();
434 create_kernel_nss();
435 detect_mvpg();
436 detect_ieee();
437 detect_csp();
438 detect_diag9c();
439 detect_diag44();
440 detect_machine_facilities();
441 setup_hpage();
442 sclp_facilities_detect();
443 detect_memory_layout(memory_chunk);
444#ifdef CONFIG_DYNAMIC_FTRACE
445 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
446#endif
447 lockdep_on();
448}
449
