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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
39char kernel_nss_name[NSS_NAME_SIZE + 1];
40
41static void __init setup_boot_command_line(void);
42
43/*
44 * Get the TOD clock running.
45 */
46static 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
61int __init savesys_ipl_nss(char *cmd, const int cmdlen);
62
63asm(
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
79static __initdata char upper_command_line[COMMAND_LINE_SIZE];
80
81static 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
184static inline void create_kernel_nss(void) { }
185
186#endif /* CONFIG_SHARED_KERNEL */
187
188/*
189 * Clear bss memory
190 */
191static 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 */
199static 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
212static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
213
214static 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
234static 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
254static __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
268static 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
286static 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 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
297}
298
299static noinline __init void setup_facility_list(void)
300{
301 stfle(S390_lowcore.stfle_fac_list,
302 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
303}
304
305static __init void detect_diag9c(void)
306{
307 unsigned int cpu_address;
308 int rc;
309
310 cpu_address = stap();
311 diag_stat_inc(DIAG_STAT_X09C);
312 asm volatile(
313 " diag %2,0,0x9c\n"
314 "0: la %0,0\n"
315 "1:\n"
316 EX_TABLE(0b,1b)
317 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
318 if (!rc)
319 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
320}
321
322static __init void detect_diag44(void)
323{
324 int rc;
325
326 diag_stat_inc(DIAG_STAT_X044);
327 asm volatile(
328 " diag 0,0,0x44\n"
329 "0: la %0,0\n"
330 "1:\n"
331 EX_TABLE(0b,1b)
332 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
333 if (!rc)
334 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
335}
336
337static __init void detect_machine_facilities(void)
338{
339 if (test_facility(8)) {
340 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
341 __ctl_set_bit(0, 23);
342 }
343 if (test_facility(78))
344 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
345 if (test_facility(3))
346 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
347 if (test_facility(40))
348 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
349 if (test_facility(50) && test_facility(73))
350 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
351 if (test_facility(51))
352 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
353 if (test_facility(129)) {
354 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
355 __ctl_set_bit(0, 17);
356 }
357}
358
359static inline void save_vector_registers(void)
360{
361#ifdef CONFIG_CRASH_DUMP
362 if (test_facility(129))
363 save_vx_regs(boot_cpu_vector_save_area);
364#endif
365}
366
367static int __init disable_vector_extension(char *str)
368{
369 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
370 __ctl_clear_bit(0, 17);
371 return 1;
372}
373early_param("novx", disable_vector_extension);
374
375static int __init cad_setup(char *str)
376{
377 int val;
378
379 get_option(&str, &val);
380 if (val && test_facility(128))
381 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
382 return 0;
383}
384early_param("cad", cad_setup);
385
386static int __init cad_init(void)
387{
388 if (MACHINE_HAS_CAD)
389 /* Enable problem state CAD. */
390 __ctl_set_bit(2, 3);
391 return 0;
392}
393early_initcall(cad_init);
394
395static __init void memmove_early(void *dst, const void *src, size_t n)
396{
397 unsigned long addr;
398 long incr;
399 psw_t old;
400
401 if (!n)
402 return;
403 incr = 1;
404 if (dst > src) {
405 incr = -incr;
406 dst += n - 1;
407 src += n - 1;
408 }
409 old = S390_lowcore.program_new_psw;
410 S390_lowcore.program_new_psw.mask = __extract_psw();
411 asm volatile(
412 " larl %[addr],1f\n"
413 " stg %[addr],%[psw_pgm_addr]\n"
414 "0: mvc 0(1,%[dst]),0(%[src])\n"
415 " agr %[dst],%[incr]\n"
416 " agr %[src],%[incr]\n"
417 " brctg %[n],0b\n"
418 "1:\n"
419 : [addr] "=&d" (addr),
420 [psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr),
421 [dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n)
422 : [incr] "d" (incr)
423 : "cc", "memory");
424 S390_lowcore.program_new_psw = old;
425}
426
427static __init noinline void ipl_save_parameters(void)
428{
429 void *src, *dst;
430
431 src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
432 dst = (void *) IPL_PARMBLOCK_ORIGIN;
433 memmove_early(dst, src, PAGE_SIZE);
434 S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
435}
436
437static __init noinline void rescue_initrd(void)
438{
439#ifdef CONFIG_BLK_DEV_INITRD
440 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
441 /*
442 * Just like in case of IPL from VM reader we make sure there is a
443 * gap of 4MB between end of kernel and start of initrd.
444 * That way we can also be sure that saving an NSS will succeed,
445 * which however only requires different segments.
446 */
447 if (!INITRD_START || !INITRD_SIZE)
448 return;
449 if (INITRD_START >= min_initrd_addr)
450 return;
451 memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
452 INITRD_START = min_initrd_addr;
453#endif
454}
455
456/* Set up boot command line */
457static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
458{
459 char *parm, *delim;
460 size_t rc, len;
461
462 len = strlen(boot_command_line);
463
464 delim = boot_command_line + len; /* '\0' character position */
465 parm = boot_command_line + len + 1; /* append right after '\0' */
466
467 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
468 if (rc) {
469 if (*parm == '=')
470 memmove(boot_command_line, parm + 1, rc);
471 else
472 *delim = ' '; /* replace '\0' with space */
473 }
474}
475
476static inline int has_ebcdic_char(const char *str)
477{
478 int i;
479
480 for (i = 0; str[i]; i++)
481 if (str[i] & 0x80)
482 return 1;
483 return 0;
484}
485
486static void __init setup_boot_command_line(void)
487{
488 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
489 /* convert arch command line to ascii if necessary */
490 if (has_ebcdic_char(COMMAND_LINE))
491 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
492 /* copy arch command line */
493 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
494 ARCH_COMMAND_LINE_SIZE);
495
496 /* append IPL PARM data to the boot command line */
497 if (MACHINE_IS_VM)
498 append_to_cmdline(append_ipl_vmparm);
499
500 append_to_cmdline(append_ipl_scpdata);
501}
502
503/*
504 * Save ipl parameters, clear bss memory, initialize storage keys
505 * and create a kernel NSS at startup if the SAVESYS= parm is defined
506 */
507void __init startup_init(void)
508{
509 reset_tod_clock();
510 ipl_save_parameters();
511 rescue_initrd();
512 clear_bss_section();
513 ipl_verify_parameters();
514 time_early_init();
515 init_kernel_storage_key();
516 lockdep_off();
517 setup_lowcore_early();
518 setup_facility_list();
519 detect_machine_type();
520 setup_arch_string();
521 ipl_update_parameters();
522 setup_boot_command_line();
523 create_kernel_nss();
524 detect_diag9c();
525 detect_diag44();
526 detect_machine_facilities();
527 save_vector_registers();
528 setup_topology();
529 sclp_early_detect();
530 lockdep_on();
531}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>
6 */
7
8#define KMSG_COMPONENT "setup"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/compiler.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/ctype.h>
16#include <linux/lockdep.h>
17#include <linux/extable.h>
18#include <linux/pfn.h>
19#include <linux/uaccess.h>
20#include <linux/kernel.h>
21#include <asm/diag.h>
22#include <asm/ebcdic.h>
23#include <asm/ipl.h>
24#include <asm/lowcore.h>
25#include <asm/processor.h>
26#include <asm/sections.h>
27#include <asm/setup.h>
28#include <asm/sysinfo.h>
29#include <asm/cpcmd.h>
30#include <asm/sclp.h>
31#include <asm/facility.h>
32#include <asm/boot_data.h>
33#include "entry.h"
34
35static void __init reset_tod_clock(void)
36{
37 u64 time;
38
39 if (store_tod_clock(&time) == 0)
40 return;
41 /* TOD clock not running. Set the clock to Unix Epoch. */
42 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
43 disabled_wait();
44
45 memset(tod_clock_base, 0, 16);
46 *(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
47 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
48}
49
50/*
51 * Initialize storage key for kernel pages
52 */
53static noinline __init void init_kernel_storage_key(void)
54{
55#if PAGE_DEFAULT_KEY
56 unsigned long end_pfn, init_pfn;
57
58 end_pfn = PFN_UP(__pa(_end));
59
60 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
61 page_set_storage_key(init_pfn << PAGE_SHIFT,
62 PAGE_DEFAULT_KEY, 0);
63#endif
64}
65
66static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
67
68static noinline __init void detect_machine_type(void)
69{
70 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
71
72 /* Check current-configuration-level */
73 if (stsi(NULL, 0, 0, 0) <= 2) {
74 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
75 return;
76 }
77 /* Get virtual-machine cpu information. */
78 if (stsi(vmms, 3, 2, 2) || !vmms->count)
79 return;
80
81 /* Detect known hypervisors */
82 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
83 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
84 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
85 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
86}
87
88/* Remove leading, trailing and double whitespace. */
89static inline void strim_all(char *str)
90{
91 char *s;
92
93 s = strim(str);
94 if (s != str)
95 memmove(str, s, strlen(s));
96 while (*str) {
97 if (!isspace(*str++))
98 continue;
99 if (isspace(*str)) {
100 s = skip_spaces(str);
101 memmove(str, s, strlen(s) + 1);
102 }
103 }
104}
105
106static noinline __init void setup_arch_string(void)
107{
108 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
109 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
110 char mstr[80], hvstr[17];
111
112 if (stsi(mach, 1, 1, 1))
113 return;
114 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
115 EBCASC(mach->type, sizeof(mach->type));
116 EBCASC(mach->model, sizeof(mach->model));
117 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
118 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
119 mach->manufacturer, mach->type,
120 mach->model, mach->model_capacity);
121 strim_all(mstr);
122 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
123 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
124 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
125 strim_all(hvstr);
126 } else {
127 sprintf(hvstr, "%s",
128 MACHINE_IS_LPAR ? "LPAR" :
129 MACHINE_IS_VM ? "z/VM" :
130 MACHINE_IS_KVM ? "KVM" : "unknown");
131 }
132 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
133}
134
135static __init void setup_topology(void)
136{
137 int max_mnest;
138
139 if (!test_facility(11))
140 return;
141 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
142 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
143 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
144 break;
145 }
146 topology_max_mnest = max_mnest;
147}
148
149static void early_pgm_check_handler(void)
150{
151 const struct exception_table_entry *fixup;
152 unsigned long cr0, cr0_new;
153 unsigned long addr;
154
155 addr = S390_lowcore.program_old_psw.addr;
156 fixup = s390_search_extables(addr);
157 if (!fixup)
158 disabled_wait();
159 /* Disable low address protection before storing into lowcore. */
160 __ctl_store(cr0, 0, 0);
161 cr0_new = cr0 & ~(1UL << 28);
162 __ctl_load(cr0_new, 0, 0);
163 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
164 __ctl_load(cr0, 0, 0);
165}
166
167static noinline __init void setup_lowcore_early(void)
168{
169 psw_t psw;
170
171 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
172 psw.addr = (unsigned long) s390_base_ext_handler;
173 S390_lowcore.external_new_psw = psw;
174 psw.addr = (unsigned long) s390_base_pgm_handler;
175 S390_lowcore.program_new_psw = psw;
176 s390_base_pgm_handler_fn = early_pgm_check_handler;
177 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
178}
179
180static noinline __init void setup_facility_list(void)
181{
182 memcpy(S390_lowcore.alt_stfle_fac_list,
183 S390_lowcore.stfle_fac_list,
184 sizeof(S390_lowcore.alt_stfle_fac_list));
185 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
186 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
187}
188
189static __init void detect_diag9c(void)
190{
191 unsigned int cpu_address;
192 int rc;
193
194 cpu_address = stap();
195 diag_stat_inc(DIAG_STAT_X09C);
196 asm volatile(
197 " diag %2,0,0x9c\n"
198 "0: la %0,0\n"
199 "1:\n"
200 EX_TABLE(0b,1b)
201 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
202 if (!rc)
203 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
204}
205
206static __init void detect_diag44(void)
207{
208 int rc;
209
210 diag_stat_inc(DIAG_STAT_X044);
211 asm volatile(
212 " diag 0,0,0x44\n"
213 "0: la %0,0\n"
214 "1:\n"
215 EX_TABLE(0b,1b)
216 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
217 if (!rc)
218 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
219}
220
221static __init void detect_machine_facilities(void)
222{
223 if (test_facility(8)) {
224 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
225 __ctl_set_bit(0, 23);
226 }
227 if (test_facility(78))
228 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
229 if (test_facility(3))
230 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
231 if (test_facility(50) && test_facility(73)) {
232 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
233 __ctl_set_bit(0, 55);
234 }
235 if (test_facility(51))
236 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
237 if (test_facility(129)) {
238 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
239 __ctl_set_bit(0, 17);
240 }
241 if (test_facility(130)) {
242 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
243 __ctl_set_bit(0, 20);
244 }
245 if (test_facility(133))
246 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
247 if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
248 /* Enabled signed clock comparator comparisons */
249 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
250 clock_comparator_max = -1ULL >> 1;
251 __ctl_set_bit(0, 53);
252 }
253}
254
255static inline void save_vector_registers(void)
256{
257#ifdef CONFIG_CRASH_DUMP
258 if (test_facility(129))
259 save_vx_regs(boot_cpu_vector_save_area);
260#endif
261}
262
263static int __init disable_vector_extension(char *str)
264{
265 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
266 __ctl_clear_bit(0, 17);
267 return 0;
268}
269early_param("novx", disable_vector_extension);
270
271static int __init noexec_setup(char *str)
272{
273 bool enabled;
274 int rc;
275
276 rc = kstrtobool(str, &enabled);
277 if (!rc && !enabled) {
278 /* Disable no-execute support */
279 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
280 __ctl_clear_bit(0, 20);
281 }
282 return rc;
283}
284early_param("noexec", noexec_setup);
285
286static int __init cad_setup(char *str)
287{
288 bool enabled;
289 int rc;
290
291 rc = kstrtobool(str, &enabled);
292 if (!rc && enabled && test_facility(128))
293 /* Enable problem state CAD. */
294 __ctl_set_bit(2, 3);
295 return rc;
296}
297early_param("cad", cad_setup);
298
299char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
300static void __init setup_boot_command_line(void)
301{
302 /* copy arch command line */
303 strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
304}
305
306static void __init check_image_bootable(void)
307{
308 if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
309 return;
310
311 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
312 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
313 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
314 disabled_wait();
315}
316
317void __init startup_init(void)
318{
319 reset_tod_clock();
320 check_image_bootable();
321 time_early_init();
322 init_kernel_storage_key();
323 lockdep_off();
324 setup_lowcore_early();
325 setup_facility_list();
326 detect_machine_type();
327 setup_arch_string();
328 setup_boot_command_line();
329 detect_diag9c();
330 detect_diag44();
331 detect_machine_facilities();
332 save_vector_registers();
333 setup_topology();
334 sclp_early_detect();
335 lockdep_on();
336}