1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.
5 */
6
7 #define KMSG_COMPONENT "setup"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10 #include <linux/sched/debug.h>
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/asm-extable.h>
22 #include <linux/memblock.h>
23 #include <asm/access-regs.h>
24 #include <asm/diag.h>
25 #include <asm/ebcdic.h>
26 #include <asm/fpu.h>
27 #include <asm/ipl.h>
28 #include <asm/lowcore.h>
29 #include <asm/processor.h>
30 #include <asm/sections.h>
31 #include <asm/setup.h>
32 #include <asm/sysinfo.h>
33 #include <asm/cpcmd.h>
34 #include <asm/sclp.h>
35 #include <asm/facility.h>
36 #include <asm/boot_data.h>
37 #include "entry.h"
38
39 #define decompressor_handled_param(param)
40 static int __init ignore_decompressor_param_##
41 {
42 return 0;
43 }
44 early_param(#param, ignore_decompressor_param_
45
46 decompressor_handled_param(mem);
47 decompressor_handled_param(vmalloc);
48 decompressor_handled_param(dfltcc);
49 decompressor_handled_param(facilities);
50 decompressor_handled_param(nokaslr);
51 decompressor_handled_param(cmma);
52 decompressor_handled_param(relocate_lowcore);
53 #if IS_ENABLED(CONFIG_KVM)
54 decompressor_handled_param(prot_virt);
55 #endif
56
57 static void __init kasan_early_init(void)
58 {
59 #ifdef CONFIG_KASAN
60 init_task.kasan_depth = 0;
61 sclp_early_printk("KernelAddressSaniti
62 #endif
63 }
64
65 static void __init reset_tod_clock(void)
66 {
67 union tod_clock clk;
68
69 if (store_tod_clock_ext_cc(&clk) == 0)
70 return;
71 /* TOD clock not running. Set the cloc
72 if (set_tod_clock(TOD_UNIX_EPOCH) || s
73 disabled_wait();
74
75 memset(&tod_clock_base, 0, sizeof(tod_
76 tod_clock_base.tod = TOD_UNIX_EPOCH;
77 get_lowcore()->last_update_clock = TOD
78 }
79
80 /*
81 * Initialize storage key for kernel pages
82 */
83 static noinline __init void init_kernel_storag
84 {
85 #if PAGE_DEFAULT_KEY
86 unsigned long end_pfn, init_pfn;
87
88 end_pfn = PFN_UP(__pa(_end));
89
90 for (init_pfn = 0 ; init_pfn < end_pfn
91 page_set_storage_key(init_pfn
92 PAGE_DEFA
93 #endif
94 }
95
96 static __initdata char sysinfo_page[PAGE_SIZE]
97
98 static noinline __init void detect_machine_typ
99 {
100 struct sysinfo_3_2_2 *vmms = (struct s
101
102 /* Check current-configuration-level *
103 if (stsi(NULL, 0, 0, 0) <= 2) {
104 get_lowcore()->machine_flags |
105 return;
106 }
107 /* Get virtual-machine cpu information
108 if (stsi(vmms, 3, 2, 2) || !vmms->coun
109 return;
110
111 /* Detect known hypervisors */
112 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5
113 get_lowcore()->machine_flags |
114 else if (!memcmp(vmms->vm[0].cpi, "\xa
115 get_lowcore()->machine_flags |
116 }
117
118 /* Remove leading, trailing and double whitesp
119 static inline void strim_all(char *str)
120 {
121 char *s;
122
123 s = strim(str);
124 if (s != str)
125 memmove(str, s, strlen(s));
126 while (*str) {
127 if (!isspace(*str++))
128 continue;
129 if (isspace(*str)) {
130 s = skip_spaces(str);
131 memmove(str, s, strlen
132 }
133 }
134 }
135
136 static noinline __init void setup_arch_string(
137 {
138 struct sysinfo_1_1_1 *mach = (struct s
139 struct sysinfo_3_2_2 *vm = (struct sys
140 char mstr[80], hvstr[17];
141
142 if (stsi(mach, 1, 1, 1))
143 return;
144 EBCASC(mach->manufacturer, sizeof(mach
145 EBCASC(mach->type, sizeof(mach->type))
146 EBCASC(mach->model, sizeof(mach->model
147 EBCASC(mach->model_capacity, sizeof(ma
148 sprintf(mstr, "%-16.16s %-4.4s %-16.16
149 mach->manufacturer, mach->type
150 mach->model, mach->model_capac
151 strim_all(mstr);
152 if (stsi(vm, 3, 2, 2) == 0 && vm->coun
153 EBCASC(vm->vm[0].cpi, sizeof(v
154 sprintf(hvstr, "%-16.16s", vm-
155 strim_all(hvstr);
156 } else {
157 sprintf(hvstr, "%s",
158 MACHINE_IS_LPAR ? "LPA
159 MACHINE_IS_VM ? "z/VM"
160 MACHINE_IS_KVM ? "KVM"
161 }
162 dump_stack_set_arch_desc("%s (%s)", ms
163 }
164
165 static __init void setup_topology(void)
166 {
167 int max_mnest;
168
169 if (!test_facility(11))
170 return;
171 get_lowcore()->machine_flags |= MACHIN
172 for (max_mnest = 6; max_mnest > 1; max
173 if (stsi(&sysinfo_page, 15, 1,
174 break;
175 }
176 topology_max_mnest = max_mnest;
177 }
178
179 void __init __do_early_pgm_check(struct pt_reg
180 {
181 struct lowcore *lc = get_lowcore();
182 unsigned long ip;
183
184 regs->int_code = lc->pgm_int_code;
185 regs->int_parm_long = lc->trans_exc_co
186 ip = __rewind_psw(regs->psw, regs->int
187
188 /* Monitor Event? Might be a warning *
189 if ((regs->int_code & PGM_INT_CODE_MAS
190 if (report_bug(ip, regs) == BU
191 return;
192 }
193 if (fixup_exception(regs))
194 return;
195 /*
196 * Unhandled exception - system cannot
197 * helpful messages to the console. Us
198 * some basic information in case it i
199 */
200 register_early_console();
201 early_printk("PANIC: early exception %
202 regs->int_code & 0xffff,
203 show_regs(regs);
204 disabled_wait();
205 }
206
207 static noinline __init void setup_lowcore_earl
208 {
209 struct lowcore *lc = get_lowcore();
210 psw_t psw;
211
212 psw.addr = (unsigned long)early_pgm_ch
213 psw.mask = PSW_KERNEL_BITS;
214 lc->program_new_psw = psw;
215 lc->preempt_count = INIT_PREEMPT_COUNT
216 lc->return_lpswe = gen_lpswe(__LC_RETU
217 lc->return_mcck_lpswe = gen_lpswe(__LC
218 }
219
220 static __init void detect_diag9c(void)
221 {
222 unsigned int cpu_address;
223 int rc;
224
225 cpu_address = stap();
226 diag_stat_inc(DIAG_STAT_X09C);
227 asm volatile(
228 " diag %2,0,0x9c\n"
229 "0: la %0,0\n"
230 "1:\n"
231 EX_TABLE(0b,1b)
232 : "=d" (rc) : "" (-EOPNOTSUPP)
233 if (!rc)
234 get_lowcore()->machine_flags |
235 }
236
237 static __init void detect_machine_facilities(v
238 {
239 if (test_facility(8)) {
240 get_lowcore()->machine_flags |
241 system_ctl_set_bit(0, CR0_EDAT
242 }
243 if (test_facility(78))
244 get_lowcore()->machine_flags |
245 if (test_facility(3))
246 get_lowcore()->machine_flags |
247 if (test_facility(50) && test_facility
248 get_lowcore()->machine_flags |
249 system_ctl_set_bit(0, CR0_TRAN
250 }
251 if (test_facility(51))
252 get_lowcore()->machine_flags |
253 if (test_facility(129))
254 system_ctl_set_bit(0, CR0_VECT
255 if (test_facility(130))
256 get_lowcore()->machine_flags |
257 if (test_facility(133))
258 get_lowcore()->machine_flags |
259 if (test_facility(139) && (tod_clock_b
260 /* Enabled signed clock compar
261 get_lowcore()->machine_flags |
262 clock_comparator_max = -1ULL >
263 system_ctl_set_bit(0, CR0_CLOC
264 }
265 if (IS_ENABLED(CONFIG_PCI) && test_fac
266 get_lowcore()->machine_flags |
267 /* the control bit is set duri
268 }
269 if (test_facility(194))
270 get_lowcore()->machine_flags |
271 if (test_facility(85))
272 get_lowcore()->machine_flags |
273 }
274
275 static inline void save_vector_registers(void)
276 {
277 #ifdef CONFIG_CRASH_DUMP
278 if (test_facility(129))
279 save_vx_regs(boot_cpu_vector_s
280 #endif
281 }
282
283 static inline void setup_low_address_protectio
284 {
285 system_ctl_set_bit(0, CR0_LOW_ADDRESS_
286 }
287
288 static inline void setup_access_registers(void
289 {
290 unsigned int acrs[NUM_ACRS] = { 0 };
291
292 restore_access_regs(acrs);
293 }
294
295 char __bootdata(early_command_line)[COMMAND_LI
296 static void __init setup_boot_command_line(voi
297 {
298 /* copy arch command line */
299 strscpy(boot_command_line, early_comma
300 }
301
302 static void __init sort_amode31_extable(void)
303 {
304 sort_extable(__start_amode31_ex_table,
305 }
306
307 void __init startup_init(void)
308 {
309 kasan_early_init();
310 reset_tod_clock();
311 time_early_init();
312 init_kernel_storage_key();
313 lockdep_off();
314 sort_amode31_extable();
315 setup_lowcore_early();
316 detect_machine_type();
317 setup_arch_string();
318 setup_boot_command_line();
319 detect_diag9c();
320 detect_machine_facilities();
321 save_vector_registers();
322 setup_topology();
323 sclp_early_detect();
324 setup_low_address_protection();
325 setup_access_registers();
326 lockdep_on();
327 }
328
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