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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 "entry.h"
33
34static void __init setup_boot_command_line(void);
35
36
37
38
39static noinline __init void init_kernel_storage_key(void)
40{
41#if PAGE_DEFAULT_KEY
42 unsigned long end_pfn, init_pfn;
43
44 end_pfn = PFN_UP(__pa(_end));
45
46 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
47 page_set_storage_key(init_pfn << PAGE_SHIFT,
48 PAGE_DEFAULT_KEY, 0);
49#endif
50}
51
52static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
53
54static noinline __init void detect_machine_type(void)
55{
56 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
57
58
59 if (stsi(NULL, 0, 0, 0) <= 2) {
60 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
61 return;
62 }
63
64 if (stsi(vmms, 3, 2, 2) || !vmms->count)
65 return;
66
67
68 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
69 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
70 else
71 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
72}
73
74
75static inline void strim_all(char *str)
76{
77 char *s;
78
79 s = strim(str);
80 if (s != str)
81 memmove(str, s, strlen(s));
82 while (*str) {
83 if (!isspace(*str++))
84 continue;
85 if (isspace(*str)) {
86 s = skip_spaces(str);
87 memmove(str, s, strlen(s) + 1);
88 }
89 }
90}
91
92static noinline __init void setup_arch_string(void)
93{
94 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
95 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
96 char mstr[80], hvstr[17];
97
98 if (stsi(mach, 1, 1, 1))
99 return;
100 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
101 EBCASC(mach->type, sizeof(mach->type));
102 EBCASC(mach->model, sizeof(mach->model));
103 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
104 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
105 mach->manufacturer, mach->type,
106 mach->model, mach->model_capacity);
107 strim_all(mstr);
108 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
109 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
110 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
111 strim_all(hvstr);
112 } else {
113 sprintf(hvstr, "%s",
114 MACHINE_IS_LPAR ? "LPAR" :
115 MACHINE_IS_VM ? "z/VM" :
116 MACHINE_IS_KVM ? "KVM" : "unknown");
117 }
118 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
119}
120
121static __init void setup_topology(void)
122{
123 int max_mnest;
124
125 if (!test_facility(11))
126 return;
127 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
128 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
129 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
130 break;
131 }
132 topology_max_mnest = max_mnest;
133}
134
135static void early_pgm_check_handler(void)
136{
137 const struct exception_table_entry *fixup;
138 unsigned long cr0, cr0_new;
139 unsigned long addr;
140
141 addr = S390_lowcore.program_old_psw.addr;
142 fixup = search_exception_tables(addr);
143 if (!fixup)
144 disabled_wait(0);
145
146 __ctl_store(cr0, 0, 0);
147 cr0_new = cr0 & ~(1UL << 28);
148 __ctl_load(cr0_new, 0, 0);
149 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
150 __ctl_load(cr0, 0, 0);
151}
152
153static noinline __init void setup_lowcore_early(void)
154{
155 psw_t psw;
156
157 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
158 psw.addr = (unsigned long) s390_base_ext_handler;
159 S390_lowcore.external_new_psw = psw;
160 psw.addr = (unsigned long) s390_base_pgm_handler;
161 S390_lowcore.program_new_psw = psw;
162 s390_base_pgm_handler_fn = early_pgm_check_handler;
163 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
164}
165
166static noinline __init void setup_facility_list(void)
167{
168 stfle(S390_lowcore.stfle_fac_list,
169 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
170 memcpy(S390_lowcore.alt_stfle_fac_list,
171 S390_lowcore.stfle_fac_list,
172 sizeof(S390_lowcore.alt_stfle_fac_list));
173 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
174 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
175}
176
177static __init void detect_diag9c(void)
178{
179 unsigned int cpu_address;
180 int rc;
181
182 cpu_address = stap();
183 diag_stat_inc(DIAG_STAT_X09C);
184 asm volatile(
185 " diag %2,0,0x9c\n"
186 "0: la %0,0\n"
187 "1:\n"
188 EX_TABLE(0b,1b)
189 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
190 if (!rc)
191 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
192}
193
194static __init void detect_diag44(void)
195{
196 int rc;
197
198 diag_stat_inc(DIAG_STAT_X044);
199 asm volatile(
200 " diag 0,0,0x44\n"
201 "0: la %0,0\n"
202 "1:\n"
203 EX_TABLE(0b,1b)
204 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
205 if (!rc)
206 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
207}
208
209static __init void detect_machine_facilities(void)
210{
211 if (test_facility(8)) {
212 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
213 __ctl_set_bit(0, 23);
214 }
215 if (test_facility(78))
216 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
217 if (test_facility(3))
218 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
219 if (test_facility(50) && test_facility(73)) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
221 __ctl_set_bit(0, 55);
222 }
223 if (test_facility(51))
224 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
225 if (test_facility(129)) {
226 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
227 __ctl_set_bit(0, 17);
228 }
229 if (test_facility(130)) {
230 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
231 __ctl_set_bit(0, 20);
232 }
233 if (test_facility(133))
234 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
235 if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
236
237 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
238 clock_comparator_max = -1ULL >> 1;
239 __ctl_set_bit(0, 53);
240 }
241}
242
243static inline void save_vector_registers(void)
244{
245#ifdef CONFIG_CRASH_DUMP
246 if (test_facility(129))
247 save_vx_regs(boot_cpu_vector_save_area);
248#endif
249}
250
251static int __init disable_vector_extension(char *str)
252{
253 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
254 __ctl_clear_bit(0, 17);
255 return 0;
256}
257early_param("novx", disable_vector_extension);
258
259static int __init noexec_setup(char *str)
260{
261 bool enabled;
262 int rc;
263
264 rc = kstrtobool(str, &enabled);
265 if (!rc && !enabled) {
266
267 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
268 __ctl_clear_bit(0, 20);
269 }
270 return rc;
271}
272early_param("noexec", noexec_setup);
273
274static int __init cad_setup(char *str)
275{
276 bool enabled;
277 int rc;
278
279 rc = kstrtobool(str, &enabled);
280 if (!rc && enabled && test_facility(128))
281
282 __ctl_set_bit(2, 3);
283 return rc;
284}
285early_param("cad", cad_setup);
286
287
288static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
289{
290 char *parm, *delim;
291 size_t rc, len;
292
293 len = strlen(boot_command_line);
294
295 delim = boot_command_line + len;
296 parm = boot_command_line + len + 1;
297
298 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
299 if (rc) {
300 if (*parm == '=')
301 memmove(boot_command_line, parm + 1, rc);
302 else
303 *delim = ' ';
304 }
305}
306
307static inline int has_ebcdic_char(const char *str)
308{
309 int i;
310
311 for (i = 0; str[i]; i++)
312 if (str[i] & 0x80)
313 return 1;
314 return 0;
315}
316
317static void __init setup_boot_command_line(void)
318{
319 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
320
321 if (has_ebcdic_char(COMMAND_LINE))
322 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
323
324 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
325 ARCH_COMMAND_LINE_SIZE);
326
327
328 if (MACHINE_IS_VM)
329 append_to_cmdline(append_ipl_vmparm);
330
331 append_to_cmdline(append_ipl_scpdata);
332}
333
334static void __init check_image_bootable(void)
335{
336 if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
337 return;
338
339 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
340 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
341 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
342 disabled_wait(0xbadb007);
343}
344
345void __init startup_init(void)
346{
347 check_image_bootable();
348 time_early_init();
349 init_kernel_storage_key();
350 lockdep_off();
351 setup_lowcore_early();
352 setup_facility_list();
353 detect_machine_type();
354 setup_arch_string();
355 ipl_store_parameters();
356 setup_boot_command_line();
357 detect_diag9c();
358 detect_diag44();
359 detect_machine_facilities();
360 save_vector_registers();
361 setup_topology();
362 sclp_early_detect();
363 lockdep_on();
364}
365
