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 int __bootdata(is_full_image);
38
39 #define decompressor_handled_param(param) \
40 static int __init ignore_decompressor_param_##param(char *s) \
41 { \
42 return 0; \
43 } \
44 early_param(#param, ignore_decompressor_param_##param)
45
46 decompressor_handled_param(mem);
47 decompressor_handled_param(vmalloc);
48 decompressor_handled_param(dfltcc);
49 decompressor_handled_param(noexec);
50 decompressor_handled_param(facilities);
51 decompressor_handled_param(nokaslr);
52 #if IS_ENABLED(CONFIG_KVM)
53 decompressor_handled_param(prot_virt);
54 #endif
55
reset_tod_clock(void)56 static void __init reset_tod_clock(void)
57 {
58 union tod_clock clk;
59
60 if (store_tod_clock_ext_cc(&clk) == 0)
61 return;
62 /* TOD clock not running. Set the clock to Unix Epoch. */
63 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
64 disabled_wait();
65
66 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
67 tod_clock_base.tod = TOD_UNIX_EPOCH;
68 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
69 }
70
71 /*
72 * Initialize storage key for kernel pages
73 */
init_kernel_storage_key(void)74 static noinline __init void init_kernel_storage_key(void)
75 {
76 #if PAGE_DEFAULT_KEY
77 unsigned long end_pfn, init_pfn;
78
79 end_pfn = PFN_UP(__pa(_end));
80
81 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
82 page_set_storage_key(init_pfn << PAGE_SHIFT,
83 PAGE_DEFAULT_KEY, 0);
84 #endif
85 }
86
87 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
88
detect_machine_type(void)89 static noinline __init void detect_machine_type(void)
90 {
91 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
92
93 /* Check current-configuration-level */
94 if (stsi(NULL, 0, 0, 0) <= 2) {
95 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
96 return;
97 }
98 /* Get virtual-machine cpu information. */
99 if (stsi(vmms, 3, 2, 2) || !vmms->count)
100 return;
101
102 /* Detect known hypervisors */
103 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
104 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
105 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
106 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
107 }
108
109 /* Remove leading, trailing and double whitespace. */
strim_all(char * str)110 static inline void strim_all(char *str)
111 {
112 char *s;
113
114 s = strim(str);
115 if (s != str)
116 memmove(str, s, strlen(s));
117 while (*str) {
118 if (!isspace(*str++))
119 continue;
120 if (isspace(*str)) {
121 s = skip_spaces(str);
122 memmove(str, s, strlen(s) + 1);
123 }
124 }
125 }
126
setup_arch_string(void)127 static noinline __init void setup_arch_string(void)
128 {
129 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
130 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
131 char mstr[80], hvstr[17];
132
133 if (stsi(mach, 1, 1, 1))
134 return;
135 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
136 EBCASC(mach->type, sizeof(mach->type));
137 EBCASC(mach->model, sizeof(mach->model));
138 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
139 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
140 mach->manufacturer, mach->type,
141 mach->model, mach->model_capacity);
142 strim_all(mstr);
143 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
144 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
145 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
146 strim_all(hvstr);
147 } else {
148 sprintf(hvstr, "%s",
149 MACHINE_IS_LPAR ? "LPAR" :
150 MACHINE_IS_VM ? "z/VM" :
151 MACHINE_IS_KVM ? "KVM" : "unknown");
152 }
153 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
154 }
155
setup_topology(void)156 static __init void setup_topology(void)
157 {
158 int max_mnest;
159
160 if (!test_facility(11))
161 return;
162 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
163 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
164 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
165 break;
166 }
167 topology_max_mnest = max_mnest;
168 }
169
__do_early_pgm_check(struct pt_regs * regs)170 void __do_early_pgm_check(struct pt_regs *regs)
171 {
172 if (!fixup_exception(regs))
173 disabled_wait();
174 }
175
setup_lowcore_early(void)176 static noinline __init void setup_lowcore_early(void)
177 {
178 psw_t psw;
179
180 psw.addr = (unsigned long)early_pgm_check_handler;
181 psw.mask = PSW_KERNEL_BITS;
182 S390_lowcore.program_new_psw = psw;
183 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
184 }
185
setup_facility_list(void)186 static noinline __init void setup_facility_list(void)
187 {
188 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
189 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
190 __clear_facility(82, alt_stfle_fac_list);
191 }
192
detect_diag9c(void)193 static __init void detect_diag9c(void)
194 {
195 unsigned int cpu_address;
196 int rc;
197
198 cpu_address = stap();
199 diag_stat_inc(DIAG_STAT_X09C);
200 asm volatile(
201 " diag %2,0,0x9c\n"
202 "0: la %0,0\n"
203 "1:\n"
204 EX_TABLE(0b,1b)
205 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
206 if (!rc)
207 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
208 }
209
detect_machine_facilities(void)210 static __init void detect_machine_facilities(void)
211 {
212 if (test_facility(8)) {
213 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
214 __ctl_set_bit(0, 23);
215 }
216 if (test_facility(78))
217 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
218 if (test_facility(3))
219 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
220 if (test_facility(50) && test_facility(73)) {
221 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
222 __ctl_set_bit(0, 55);
223 }
224 if (test_facility(51))
225 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
226 if (test_facility(129)) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
228 __ctl_set_bit(0, 17);
229 }
230 if (test_facility(130) && !noexec_disabled) {
231 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
232 __ctl_set_bit(0, 20);
233 }
234 if (test_facility(133))
235 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
236 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
237 /* Enabled signed clock comparator comparisons */
238 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
239 clock_comparator_max = -1ULL >> 1;
240 __ctl_set_bit(0, 53);
241 }
242 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
243 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
244 /* the control bit is set during PCI initialization */
245 }
246 if (test_facility(194))
247 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP;
248 }
249
save_vector_registers(void)250 static inline void save_vector_registers(void)
251 {
252 #ifdef CONFIG_CRASH_DUMP
253 if (test_facility(129))
254 save_vx_regs(boot_cpu_vector_save_area);
255 #endif
256 }
257
setup_control_registers(void)258 static inline void setup_control_registers(void)
259 {
260 unsigned long reg;
261
262 __ctl_store(reg, 0, 0);
263 reg |= CR0_LOW_ADDRESS_PROTECTION;
264 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
265 reg |= CR0_EXTERNAL_CALL_SUBMASK;
266 __ctl_load(reg, 0, 0);
267 }
268
setup_access_registers(void)269 static inline void setup_access_registers(void)
270 {
271 unsigned int acrs[NUM_ACRS] = { 0 };
272
273 restore_access_regs(acrs);
274 }
275
disable_vector_extension(char * str)276 static int __init disable_vector_extension(char *str)
277 {
278 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
279 __ctl_clear_bit(0, 17);
280 return 0;
281 }
282 early_param("novx", disable_vector_extension);
283
284 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
setup_boot_command_line(void)285 static void __init setup_boot_command_line(void)
286 {
287 /* copy arch command line */
288 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
289 }
290
check_image_bootable(void)291 static void __init check_image_bootable(void)
292 {
293 if (is_full_image)
294 return;
295
296 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
297 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
298 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
299 disabled_wait();
300 }
301
sort_amode31_extable(void)302 static void __init sort_amode31_extable(void)
303 {
304 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
305 }
306
startup_init(void)307 void __init startup_init(void)
308 {
309 reset_tod_clock();
310 check_image_bootable();
311 time_early_init();
312 init_kernel_storage_key();
313 lockdep_off();
314 sort_amode31_extable();
315 setup_lowcore_early();
316 setup_facility_list();
317 detect_machine_type();
318 setup_arch_string();
319 setup_boot_command_line();
320 detect_diag9c();
321 detect_machine_facilities();
322 save_vector_registers();
323 setup_topology();
324 sclp_early_detect();
325 setup_control_registers();
326 setup_access_registers();
327 lockdep_on();
328 }
329