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/access-regs.h>
23 #include <asm/diag.h>
24 #include <asm/ebcdic.h>
25 #include <asm/fpu.h>
26 #include <asm/ipl.h>
27 #include <asm/lowcore.h>
28 #include <asm/processor.h>
29 #include <asm/sections.h>
30 #include <asm/setup.h>
31 #include <asm/sysinfo.h>
32 #include <asm/cpcmd.h>
33 #include <asm/sclp.h>
34 #include <asm/facility.h>
35 #include <asm/boot_data.h>
36 #include "entry.h"
37
38 #define decompressor_handled_param(param) \
39 static int __init ignore_decompressor_param_##param(char *s) \
40 { \
41 return 0; \
42 } \
43 early_param(#param, ignore_decompressor_param_##param)
44
45 decompressor_handled_param(mem);
46 decompressor_handled_param(vmalloc);
47 decompressor_handled_param(dfltcc);
48 decompressor_handled_param(facilities);
49 decompressor_handled_param(nokaslr);
50 decompressor_handled_param(cmma);
51 decompressor_handled_param(relocate_lowcore);
52 #if IS_ENABLED(CONFIG_KVM)
53 decompressor_handled_param(prot_virt);
54 #endif
55
56 static void __init kasan_early_init(void)
57 {
58 #ifdef CONFIG_KASAN
59 init_task.kasan_depth = 0;
60 sclp_early_printk("KernelAddressSanitizer initialized\n");
61 #endif
62 }
63
64 static void __init reset_tod_clock(void)
65 {
66 union tod_clock clk;
67
68 if (store_tod_clock_ext_cc(&clk) == 0)
69 return;
70 /* TOD clock not running. Set the clock to Unix Epoch. */
71 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
72 disabled_wait();
73
74 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
75 tod_clock_base.tod = TOD_UNIX_EPOCH;
76 get_lowcore()->last_update_clock = TOD_UNIX_EPOCH;
77 }
78
79 /*
80 * Initialize storage key for kernel pages
81 */
82 static noinline __init void init_kernel_storage_key(void)
83 {
84 #if PAGE_DEFAULT_KEY
85 unsigned long end_pfn, init_pfn;
86
87 end_pfn = PFN_UP(__pa(_end));
88
89 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
90 page_set_storage_key(init_pfn << PAGE_SHIFT,
91 PAGE_DEFAULT_KEY, 0);
92 #endif
93 }
94
95 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
96
97 static noinline __init void detect_machine_type(void)
98 {
99 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
100
101 /* Check current-configuration-level */
102 if (stsi(NULL, 0, 0, 0) <= 2) {
103 get_lowcore()->machine_flags |= MACHINE_FLAG_LPAR;
104 return;
105 }
106 /* Get virtual-machine cpu information. */
107 if (stsi(vmms, 3, 2, 2) || !vmms->count)
108 return;
109
110 /* Detect known hypervisors */
111 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
112 get_lowcore()->machine_flags |= MACHINE_FLAG_KVM;
113 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
114 get_lowcore()->machine_flags |= MACHINE_FLAG_VM;
115 }
116
117 /* Remove leading, trailing and double whitespace. */
118 static inline void strim_all(char *str)
119 {
120 char *s;
121
122 s = strim(str);
123 if (s != str)
124 memmove(str, s, strlen(s));
125 while (*str) {
126 if (!isspace(*str++))
127 continue;
128 if (isspace(*str)) {
129 s = skip_spaces(str);
130 memmove(str, s, strlen(s) + 1);
131 }
132 }
133 }
134
135 static noinline __init void setup_arch_string(void)
136 {
137 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
138 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
139 char mstr[80], hvstr[17];
140
141 if (stsi(mach, 1, 1, 1))
142 return;
143 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
144 EBCASC(mach->type, sizeof(mach->type));
145 EBCASC(mach->model, sizeof(mach->model));
146 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
147 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
148 mach->manufacturer, mach->type,
149 mach->model, mach->model_capacity);
150 strim_all(mstr);
151 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
152 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
153 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
154 strim_all(hvstr);
155 } else {
156 sprintf(hvstr, "%s",
157 MACHINE_IS_LPAR ? "LPAR" :
158 MACHINE_IS_VM ? "z/VM" :
159 MACHINE_IS_KVM ? "KVM" : "unknown");
160 }
161 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
162 }
163
164 static __init void setup_topology(void)
165 {
166 int max_mnest;
167
168 if (!test_facility(11))
169 return;
170 get_lowcore()->machine_flags |= MACHINE_FLAG_TOPOLOGY;
171 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
172 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
173 break;
174 }
175 topology_max_mnest = max_mnest;
176 }
177
178 void __do_early_pgm_check(struct pt_regs *regs)
179 {
180 struct lowcore *lc = get_lowcore();
181 unsigned long ip;
182
183 regs->int_code = lc->pgm_int_code;
184 regs->int_parm_long = lc->trans_exc_code;
185 ip = __rewind_psw(regs->psw, regs->int_code >> 16);
186
187 /* Monitor Event? Might be a warning */
188 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) {
189 if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN)
190 return;
191 }
192 if (fixup_exception(regs))
193 return;
194 disabled_wait();
195 }
196
197 static noinline __init void setup_lowcore_early(void)
198 {
199 struct lowcore *lc = get_lowcore();
200 psw_t psw;
201
202 psw.addr = (unsigned long)early_pgm_check_handler;
203 psw.mask = PSW_KERNEL_BITS;
204 lc->program_new_psw = psw;
205 lc->preempt_count = INIT_PREEMPT_COUNT;
206 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
207 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
208 }
209
210 static __init void detect_diag9c(void)
211 {
212 unsigned int cpu_address;
213 int rc;
214
215 cpu_address = stap();
216 diag_stat_inc(DIAG_STAT_X09C);
217 asm volatile(
218 " diag %2,0,0x9c\n"
219 "0: la %0,0\n"
220 "1:\n"
221 EX_TABLE(0b,1b)
222 : "=d" (rc) : "" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
223 if (!rc)
224 get_lowcore()->machine_flags |= MACHINE_FLAG_DIAG9C;
225 }
226
227 static __init void detect_machine_facilities(void)
228 {
229 if (test_facility(8)) {
230 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT1;
231 system_ctl_set_bit(0, CR0_EDAT_BIT);
232 }
233 if (test_facility(78))
234 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT2;
235 if (test_facility(3))
236 get_lowcore()->machine_flags |= MACHINE_FLAG_IDTE;
237 if (test_facility(50) && test_facility(73)) {
238 get_lowcore()->machine_flags |= MACHINE_FLAG_TE;
239 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
240 }
241 if (test_facility(51))
242 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC;
243 if (test_facility(129))
244 system_ctl_set_bit(0, CR0_VECTOR_BIT);
245 if (test_facility(130))
246 get_lowcore()->machine_flags |= MACHINE_FLAG_NX;
247 if (test_facility(133))
248 get_lowcore()->machine_flags |= MACHINE_FLAG_GS;
249 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
250 /* Enabled signed clock comparator comparisons */
251 get_lowcore()->machine_flags |= MACHINE_FLAG_SCC;
252 clock_comparator_max = -1ULL >> 1;
253 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT);
254 }
255 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
256 get_lowcore()->machine_flags |= MACHINE_FLAG_PCI_MIO;
257 /* the control bit is set during PCI initialization */
258 }
259 if (test_facility(194))
260 get_lowcore()->machine_flags |= MACHINE_FLAG_RDP;
261 }
262
263 static inline void save_vector_registers(void)
264 {
265 #ifdef CONFIG_CRASH_DUMP
266 if (test_facility(129))
267 save_vx_regs(boot_cpu_vector_save_area);
268 #endif
269 }
270
271 static inline void setup_low_address_protection(void)
272 {
273 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
274 }
275
276 static inline void setup_access_registers(void)
277 {
278 unsigned int acrs[NUM_ACRS] = { 0 };
279
280 restore_access_regs(acrs);
281 }
282
283 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
284 static void __init setup_boot_command_line(void)
285 {
286 /* copy arch command line */
287 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
288 }
289
290 static void __init sort_amode31_extable(void)
291 {
292 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
293 }
294
295 void __init startup_init(void)
296 {
297 kasan_early_init();
298 reset_tod_clock();
299 time_early_init();
300 init_kernel_storage_key();
301 lockdep_off();
302 sort_amode31_extable();
303 setup_lowcore_early();
304 detect_machine_type();
305 setup_arch_string();
306 setup_boot_command_line();
307 detect_diag9c();
308 detect_machine_facilities();
309 save_vector_registers();
310 setup_topology();
311 sclp_early_detect();
312 setup_low_address_protection();
313 setup_access_registers();
314 lockdep_on();
315 }
316
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