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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
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
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
73 if (stsi(NULL, 0, 0, 0) <= 2) {
74 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
75 return;
76 }
77
78 if (stsi(vmms, 3, 2, 2) || !vmms->count)
79 return;
80
81
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
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
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
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
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
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
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}
337
