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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/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) \
40static int __init ignore_decompressor_param_##param(char *s) \
41{ \
42 return 0; \
43} \
44early_param(#param, ignore_decompressor_param_##param)
45
46decompressor_handled_param(mem);
47decompressor_handled_param(vmalloc);
48decompressor_handled_param(dfltcc);
49decompressor_handled_param(facilities);
50decompressor_handled_param(nokaslr);
51decompressor_handled_param(cmma);
52decompressor_handled_param(relocate_lowcore);
53#if IS_ENABLED(CONFIG_KVM)
54decompressor_handled_param(prot_virt);
55#endif
56
57static void __init kasan_early_init(void)
58{
59#ifdef CONFIG_KASAN
60 init_task.kasan_depth = 0;
61 sclp_early_printk("KernelAddressSanitizer initialized\n");
62#endif
63}
64
65static 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 clock to Unix Epoch. */
72 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
73 disabled_wait();
74
75 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
76 tod_clock_base.tod = TOD_UNIX_EPOCH;
77 get_lowcore()->last_update_clock = TOD_UNIX_EPOCH;
78}
79
80/*
81 * Initialize storage key for kernel pages
82 */
83static noinline __init void init_kernel_storage_key(void)
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; init_pfn++)
91 page_set_storage_key(init_pfn << PAGE_SHIFT,
92 PAGE_DEFAULT_KEY, 0);
93#endif
94}
95
96static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
97
98static noinline __init void detect_machine_type(void)
99{
100 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
101
102 /* Check current-configuration-level */
103 if (stsi(NULL, 0, 0, 0) <= 2) {
104 get_lowcore()->machine_flags |= MACHINE_FLAG_LPAR;
105 return;
106 }
107 /* Get virtual-machine cpu information. */
108 if (stsi(vmms, 3, 2, 2) || !vmms->count)
109 return;
110
111 /* Detect known hypervisors */
112 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
113 get_lowcore()->machine_flags |= MACHINE_FLAG_KVM;
114 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
115 get_lowcore()->machine_flags |= MACHINE_FLAG_VM;
116}
117
118/* Remove leading, trailing and double whitespace. */
119static 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(s) + 1);
132 }
133 }
134}
135
136static noinline __init void setup_arch_string(void)
137{
138 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
139 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
140 char mstr[80], hvstr[17];
141
142 if (stsi(mach, 1, 1, 1))
143 return;
144 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
145 EBCASC(mach->type, sizeof(mach->type));
146 EBCASC(mach->model, sizeof(mach->model));
147 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
148 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
149 mach->manufacturer, mach->type,
150 mach->model, mach->model_capacity);
151 strim_all(mstr);
152 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
153 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
154 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
155 strim_all(hvstr);
156 } else {
157 sprintf(hvstr, "%s",
158 MACHINE_IS_LPAR ? "LPAR" :
159 MACHINE_IS_VM ? "z/VM" :
160 MACHINE_IS_KVM ? "KVM" : "unknown");
161 }
162 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
163}
164
165static __init void setup_topology(void)
166{
167 int max_mnest;
168
169 if (!test_facility(11))
170 return;
171 get_lowcore()->machine_flags |= MACHINE_FLAG_TOPOLOGY;
172 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
173 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
174 break;
175 }
176 topology_max_mnest = max_mnest;
177}
178
179void __init __do_early_pgm_check(struct pt_regs *regs)
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_code;
186 ip = __rewind_psw(regs->psw, regs->int_code >> 16);
187
188 /* Monitor Event? Might be a warning */
189 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) {
190 if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN)
191 return;
192 }
193 if (fixup_exception(regs))
194 return;
195 /*
196 * Unhandled exception - system cannot continue but try to get some
197 * helpful messages to the console. Use early_printk() to print
198 * some basic information in case it is too early for printk().
199 */
200 register_early_console();
201 early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n",
202 regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr);
203 show_regs(regs);
204 disabled_wait();
205}
206
207static noinline __init void setup_lowcore_early(void)
208{
209 struct lowcore *lc = get_lowcore();
210 psw_t psw;
211
212 psw.addr = (unsigned long)early_pgm_check_handler;
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_RETURN_PSW);
217 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
218}
219
220static __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) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
233 if (!rc)
234 get_lowcore()->machine_flags |= MACHINE_FLAG_DIAG9C;
235}
236
237static __init void detect_machine_facilities(void)
238{
239 if (test_facility(8)) {
240 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT1;
241 system_ctl_set_bit(0, CR0_EDAT_BIT);
242 }
243 if (test_facility(78))
244 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT2;
245 if (test_facility(3))
246 get_lowcore()->machine_flags |= MACHINE_FLAG_IDTE;
247 if (test_facility(50) && test_facility(73)) {
248 get_lowcore()->machine_flags |= MACHINE_FLAG_TE;
249 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
250 }
251 if (test_facility(51))
252 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC;
253 if (test_facility(129))
254 system_ctl_set_bit(0, CR0_VECTOR_BIT);
255 if (test_facility(130))
256 get_lowcore()->machine_flags |= MACHINE_FLAG_NX;
257 if (test_facility(133))
258 get_lowcore()->machine_flags |= MACHINE_FLAG_GS;
259 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
260 /* Enabled signed clock comparator comparisons */
261 get_lowcore()->machine_flags |= MACHINE_FLAG_SCC;
262 clock_comparator_max = -1ULL >> 1;
263 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT);
264 }
265 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
266 get_lowcore()->machine_flags |= MACHINE_FLAG_PCI_MIO;
267 /* the control bit is set during PCI initialization */
268 }
269 if (test_facility(194))
270 get_lowcore()->machine_flags |= MACHINE_FLAG_RDP;
271 if (test_facility(85))
272 get_lowcore()->machine_flags |= MACHINE_FLAG_SEQ_INSN;
273}
274
275static inline void save_vector_registers(void)
276{
277#ifdef CONFIG_CRASH_DUMP
278 if (test_facility(129))
279 save_vx_regs(boot_cpu_vector_save_area);
280#endif
281}
282
283static inline void setup_low_address_protection(void)
284{
285 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
286}
287
288static inline void setup_access_registers(void)
289{
290 unsigned int acrs[NUM_ACRS] = { 0 };
291
292 restore_access_regs(acrs);
293}
294
295char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
296static void __init setup_boot_command_line(void)
297{
298 /* copy arch command line */
299 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
300}
301
302static void __init sort_amode31_extable(void)
303{
304 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
305}
306
307void __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}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>
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 <asm/switch_to.h>
34#include "entry.h"
35
36int __bootdata(is_full_image);
37
38static void __init reset_tod_clock(void)
39{
40 union tod_clock clk;
41
42 if (store_tod_clock_ext_cc(&clk) == 0)
43 return;
44 /* TOD clock not running. Set the clock to Unix Epoch. */
45 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
46 disabled_wait();
47
48 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
49 tod_clock_base.tod = TOD_UNIX_EPOCH;
50 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
51}
52
53/*
54 * Initialize storage key for kernel pages
55 */
56static noinline __init void init_kernel_storage_key(void)
57{
58#if PAGE_DEFAULT_KEY
59 unsigned long end_pfn, init_pfn;
60
61 end_pfn = PFN_UP(__pa(_end));
62
63 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
64 page_set_storage_key(init_pfn << PAGE_SHIFT,
65 PAGE_DEFAULT_KEY, 0);
66#endif
67}
68
69static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
70
71static noinline __init void detect_machine_type(void)
72{
73 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
74
75 /* Check current-configuration-level */
76 if (stsi(NULL, 0, 0, 0) <= 2) {
77 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
78 return;
79 }
80 /* Get virtual-machine cpu information. */
81 if (stsi(vmms, 3, 2, 2) || !vmms->count)
82 return;
83
84 /* Detect known hypervisors */
85 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
86 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
87 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
88 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
89}
90
91/* Remove leading, trailing and double whitespace. */
92static inline void strim_all(char *str)
93{
94 char *s;
95
96 s = strim(str);
97 if (s != str)
98 memmove(str, s, strlen(s));
99 while (*str) {
100 if (!isspace(*str++))
101 continue;
102 if (isspace(*str)) {
103 s = skip_spaces(str);
104 memmove(str, s, strlen(s) + 1);
105 }
106 }
107}
108
109static noinline __init void setup_arch_string(void)
110{
111 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
112 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
113 char mstr[80], hvstr[17];
114
115 if (stsi(mach, 1, 1, 1))
116 return;
117 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
118 EBCASC(mach->type, sizeof(mach->type));
119 EBCASC(mach->model, sizeof(mach->model));
120 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
121 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
122 mach->manufacturer, mach->type,
123 mach->model, mach->model_capacity);
124 strim_all(mstr);
125 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
126 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
127 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
128 strim_all(hvstr);
129 } else {
130 sprintf(hvstr, "%s",
131 MACHINE_IS_LPAR ? "LPAR" :
132 MACHINE_IS_VM ? "z/VM" :
133 MACHINE_IS_KVM ? "KVM" : "unknown");
134 }
135 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
136}
137
138static __init void setup_topology(void)
139{
140 int max_mnest;
141
142 if (!test_facility(11))
143 return;
144 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
145 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
146 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
147 break;
148 }
149 topology_max_mnest = max_mnest;
150}
151
152static void early_pgm_check_handler(void)
153{
154 const struct exception_table_entry *fixup;
155 unsigned long cr0, cr0_new;
156 unsigned long addr;
157
158 addr = S390_lowcore.program_old_psw.addr;
159 fixup = s390_search_extables(addr);
160 if (!fixup)
161 disabled_wait();
162 /* Disable low address protection before storing into lowcore. */
163 __ctl_store(cr0, 0, 0);
164 cr0_new = cr0 & ~(1UL << 28);
165 __ctl_load(cr0_new, 0, 0);
166 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
167 __ctl_load(cr0, 0, 0);
168}
169
170static noinline __init void setup_lowcore_early(void)
171{
172 psw_t psw;
173
174 psw.addr = (unsigned long)s390_base_pgm_handler;
175 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
176 if (IS_ENABLED(CONFIG_KASAN))
177 psw.mask |= PSW_MASK_DAT;
178 S390_lowcore.program_new_psw = psw;
179 s390_base_pgm_handler_fn = early_pgm_check_handler;
180 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
181}
182
183static noinline __init void setup_facility_list(void)
184{
185 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
186 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
187 __clear_facility(82, alt_stfle_fac_list);
188}
189
190static __init void detect_diag9c(void)
191{
192 unsigned int cpu_address;
193 int rc;
194
195 cpu_address = stap();
196 diag_stat_inc(DIAG_STAT_X09C);
197 asm volatile(
198 " diag %2,0,0x9c\n"
199 "0: la %0,0\n"
200 "1:\n"
201 EX_TABLE(0b,1b)
202 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
203 if (!rc)
204 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
205}
206
207static __init void detect_machine_facilities(void)
208{
209 if (test_facility(8)) {
210 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
211 __ctl_set_bit(0, 23);
212 }
213 if (test_facility(78))
214 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
215 if (test_facility(3))
216 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
217 if (test_facility(50) && test_facility(73)) {
218 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
219 __ctl_set_bit(0, 55);
220 }
221 if (test_facility(51))
222 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
223 if (test_facility(129)) {
224 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
225 __ctl_set_bit(0, 17);
226 }
227 if (test_facility(130) && !noexec_disabled) {
228 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
229 __ctl_set_bit(0, 20);
230 }
231 if (test_facility(133))
232 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
233 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
234 /* Enabled signed clock comparator comparisons */
235 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
236 clock_comparator_max = -1ULL >> 1;
237 __ctl_set_bit(0, 53);
238 }
239 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
240 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
241 /* the control bit is set during PCI initialization */
242 }
243}
244
245static inline void save_vector_registers(void)
246{
247#ifdef CONFIG_CRASH_DUMP
248 if (test_facility(129))
249 save_vx_regs(boot_cpu_vector_save_area);
250#endif
251}
252
253static inline void setup_control_registers(void)
254{
255 unsigned long reg;
256
257 __ctl_store(reg, 0, 0);
258 reg |= CR0_LOW_ADDRESS_PROTECTION;
259 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
260 reg |= CR0_EXTERNAL_CALL_SUBMASK;
261 __ctl_load(reg, 0, 0);
262}
263
264static inline void setup_access_registers(void)
265{
266 unsigned int acrs[NUM_ACRS] = { 0 };
267
268 restore_access_regs(acrs);
269}
270
271static int __init disable_vector_extension(char *str)
272{
273 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
274 __ctl_clear_bit(0, 17);
275 return 0;
276}
277early_param("novx", disable_vector_extension);
278
279char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
280static void __init setup_boot_command_line(void)
281{
282 /* copy arch command line */
283 strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
284}
285
286static void __init check_image_bootable(void)
287{
288 if (is_full_image)
289 return;
290
291 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
292 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
293 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
294 disabled_wait();
295}
296
297void __init startup_init(void)
298{
299 reset_tod_clock();
300 check_image_bootable();
301 time_early_init();
302 init_kernel_storage_key();
303 lockdep_off();
304 setup_lowcore_early();
305 setup_facility_list();
306 detect_machine_type();
307 setup_arch_string();
308 setup_boot_command_line();
309 detect_diag9c();
310 detect_machine_facilities();
311 save_vector_registers();
312 setup_topology();
313 sclp_early_detect();
314 setup_control_registers();
315 setup_access_registers();
316 lockdep_on();
317}