1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.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/asm-extable.h>
21 #include <linux/memblock.h>
22 #include <asm/diag.h>
23 #include <asm/ebcdic.h>
24 #include <asm/ipl.h>
25 #include <asm/lowcore.h>
26 #include <asm/processor.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/sysinfo.h>
30 #include <asm/cpcmd.h>
31 #include <asm/sclp.h>
32 #include <asm/facility.h>
33 #include <asm/boot_data.h>
34 #include <asm/switch_to.h>
35 #include "entry.h"
36
37 #define decompressor_handled_param(param) \
38 static int __init ignore_decompressor_param_##param(char *s) \
39 { \
40 return 0; \
41 } \
42 early_param(#param, ignore_decompressor_param_##param)
43
44 decompressor_handled_param(mem);
45 decompressor_handled_param(vmalloc);
46 decompressor_handled_param(dfltcc);
47 decompressor_handled_param(facilities);
48 decompressor_handled_param(nokaslr);
49 #if IS_ENABLED(CONFIG_KVM)
50 decompressor_handled_param(prot_virt);
51 #endif
52
kasan_early_init(void)53 static void __init kasan_early_init(void)
54 {
55 #ifdef CONFIG_KASAN
56 init_task.kasan_depth = 0;
57 sclp_early_printk("KernelAddressSanitizer initialized\n");
58 #endif
59 }
60
reset_tod_clock(void)61 static void __init reset_tod_clock(void)
62 {
63 union tod_clock clk;
64
65 if (store_tod_clock_ext_cc(&clk) == 0)
66 return;
67 /* TOD clock not running. Set the clock to Unix Epoch. */
68 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
69 disabled_wait();
70
71 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
72 tod_clock_base.tod = TOD_UNIX_EPOCH;
73 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
74 }
75
76 /*
77 * Initialize storage key for kernel pages
78 */
init_kernel_storage_key(void)79 static noinline __init void init_kernel_storage_key(void)
80 {
81 #if PAGE_DEFAULT_KEY
82 unsigned long end_pfn, init_pfn;
83
84 end_pfn = PFN_UP(__pa(_end));
85
86 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
87 page_set_storage_key(init_pfn << PAGE_SHIFT,
88 PAGE_DEFAULT_KEY, 0);
89 #endif
90 }
91
92 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
93
detect_machine_type(void)94 static noinline __init void detect_machine_type(void)
95 {
96 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
97
98 /* Check current-configuration-level */
99 if (stsi(NULL, 0, 0, 0) <= 2) {
100 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
101 return;
102 }
103 /* Get virtual-machine cpu information. */
104 if (stsi(vmms, 3, 2, 2) || !vmms->count)
105 return;
106
107 /* Detect known hypervisors */
108 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
109 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
110 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
111 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
112 }
113
114 /* Remove leading, trailing and double whitespace. */
strim_all(char * str)115 static inline void strim_all(char *str)
116 {
117 char *s;
118
119 s = strim(str);
120 if (s != str)
121 memmove(str, s, strlen(s));
122 while (*str) {
123 if (!isspace(*str++))
124 continue;
125 if (isspace(*str)) {
126 s = skip_spaces(str);
127 memmove(str, s, strlen(s) + 1);
128 }
129 }
130 }
131
setup_arch_string(void)132 static noinline __init void setup_arch_string(void)
133 {
134 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
135 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
136 char mstr[80], hvstr[17];
137
138 if (stsi(mach, 1, 1, 1))
139 return;
140 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
141 EBCASC(mach->type, sizeof(mach->type));
142 EBCASC(mach->model, sizeof(mach->model));
143 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
144 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
145 mach->manufacturer, mach->type,
146 mach->model, mach->model_capacity);
147 strim_all(mstr);
148 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
149 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
150 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
151 strim_all(hvstr);
152 } else {
153 sprintf(hvstr, "%s",
154 MACHINE_IS_LPAR ? "LPAR" :
155 MACHINE_IS_VM ? "z/VM" :
156 MACHINE_IS_KVM ? "KVM" : "unknown");
157 }
158 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
159 }
160
setup_topology(void)161 static __init void setup_topology(void)
162 {
163 int max_mnest;
164
165 if (!test_facility(11))
166 return;
167 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
168 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
169 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
170 break;
171 }
172 topology_max_mnest = max_mnest;
173 }
174
__do_early_pgm_check(struct pt_regs * regs)175 void __do_early_pgm_check(struct pt_regs *regs)
176 {
177 if (!fixup_exception(regs))
178 disabled_wait();
179 }
180
setup_lowcore_early(void)181 static noinline __init void setup_lowcore_early(void)
182 {
183 psw_t psw;
184
185 psw.addr = (unsigned long)early_pgm_check_handler;
186 psw.mask = PSW_KERNEL_BITS;
187 S390_lowcore.program_new_psw = psw;
188 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
189 }
190
setup_facility_list(void)191 static noinline __init void setup_facility_list(void)
192 {
193 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
194 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
195 __clear_facility(82, alt_stfle_fac_list);
196 }
197
detect_diag9c(void)198 static __init void detect_diag9c(void)
199 {
200 unsigned int cpu_address;
201 int rc;
202
203 cpu_address = stap();
204 diag_stat_inc(DIAG_STAT_X09C);
205 asm volatile(
206 " diag %2,0,0x9c\n"
207 "0: la %0,0\n"
208 "1:\n"
209 EX_TABLE(0b,1b)
210 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
211 if (!rc)
212 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
213 }
214
detect_machine_facilities(void)215 static __init void detect_machine_facilities(void)
216 {
217 if (test_facility(8)) {
218 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
219 __ctl_set_bit(0, 23);
220 }
221 if (test_facility(78))
222 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
223 if (test_facility(3))
224 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
225 if (test_facility(50) && test_facility(73)) {
226 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
227 __ctl_set_bit(0, 55);
228 }
229 if (test_facility(51))
230 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
231 if (test_facility(129)) {
232 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
233 __ctl_set_bit(0, 17);
234 }
235 if (test_facility(130))
236 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
237 if (test_facility(133))
238 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
239 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
240 /* Enabled signed clock comparator comparisons */
241 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
242 clock_comparator_max = -1ULL >> 1;
243 __ctl_set_bit(0, 53);
244 }
245 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
246 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
247 /* the control bit is set during PCI initialization */
248 }
249 if (test_facility(194))
250 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP;
251 }
252
save_vector_registers(void)253 static inline void save_vector_registers(void)
254 {
255 #ifdef CONFIG_CRASH_DUMP
256 if (test_facility(129))
257 save_vx_regs(boot_cpu_vector_save_area);
258 #endif
259 }
260
setup_control_registers(void)261 static inline void setup_control_registers(void)
262 {
263 unsigned long reg;
264
265 __ctl_store(reg, 0, 0);
266 reg |= CR0_LOW_ADDRESS_PROTECTION;
267 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
268 reg |= CR0_EXTERNAL_CALL_SUBMASK;
269 __ctl_load(reg, 0, 0);
270 }
271
setup_access_registers(void)272 static inline void setup_access_registers(void)
273 {
274 unsigned int acrs[NUM_ACRS] = { 0 };
275
276 restore_access_regs(acrs);
277 }
278
disable_vector_extension(char * str)279 static int __init disable_vector_extension(char *str)
280 {
281 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
282 __ctl_clear_bit(0, 17);
283 return 0;
284 }
285 early_param("novx", disable_vector_extension);
286
287 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
setup_boot_command_line(void)288 static void __init setup_boot_command_line(void)
289 {
290 /* copy arch command line */
291 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
292 }
293
sort_amode31_extable(void)294 static void __init sort_amode31_extable(void)
295 {
296 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
297 }
298
startup_init(void)299 void __init startup_init(void)
300 {
301 kasan_early_init();
302 reset_tod_clock();
303 time_early_init();
304 init_kernel_storage_key();
305 lockdep_off();
306 sort_amode31_extable();
307 setup_lowcore_early();
308 setup_facility_list();
309 detect_machine_type();
310 setup_arch_string();
311 setup_boot_command_line();
312 detect_diag9c();
313 detect_machine_facilities();
314 save_vector_registers();
315 setup_topology();
316 sclp_early_detect();
317 setup_control_registers();
318 setup_access_registers();
319 lockdep_on();
320 }
321