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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *    Copyright IBM Corp. 2007, 2009
4  *    Author(s): Hongjie Yang <[email protected]>,
5  *               Heiko Carstens <[email protected]>
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
35 static 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  */
53 static 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
66 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
67
68 static 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. */
89 static 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
106 static 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
135 static __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
149 static 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
167 static 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
180 static 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
189 static __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
206 static __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
221 static __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
255 static 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
263 static 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 }
269 early_param("novx", disable_vector_extension);
270
271 static 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 }
284 early_param("noexec", noexec_setup);
285
286 static 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 }
297 early_param("cad", cad_setup);
298
299 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
300 static 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
306 static 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
317 void __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 }
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