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 if (!fixup_exception(regs))
181 disabled_wait();
182 }
183
184 static noinline __init void setup_lowcore_early(void)
185 {
186 psw_t psw;
187
188 psw.addr = (unsigned long)early_pgm_check_handler;
189 psw.mask = PSW_KERNEL_BITS;
190 get_lowcore()->program_new_psw = psw;
191 get_lowcore()->preempt_count = INIT_PREEMPT_COUNT;
192 }
193
194 static __init void detect_diag9c(void)
195 {
196 unsigned int cpu_address;
197 int rc;
198
199 cpu_address = stap();
200 diag_stat_inc(DIAG_STAT_X09C);
201 asm volatile(
202 " diag %2,0,0x9c\n"
203 "0: la %0,0\n"
204 "1:\n"
205 EX_TABLE(0b,1b)
206 : "=d" (rc) : "" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
207 if (!rc)
208 get_lowcore()->machine_flags |= MACHINE_FLAG_DIAG9C;
209 }
210
211 static __init void detect_machine_facilities(void)
212 {
213 if (test_facility(8)) {
214 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT1;
215 system_ctl_set_bit(0, CR0_EDAT_BIT);
216 }
217 if (test_facility(78))
218 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT2;
219 if (test_facility(3))
220 get_lowcore()->machine_flags |= MACHINE_FLAG_IDTE;
221 if (test_facility(50) && test_facility(73)) {
222 get_lowcore()->machine_flags |= MACHINE_FLAG_TE;
223 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
224 }
225 if (test_facility(51))
226 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC;
227 if (test_facility(129))
228 system_ctl_set_bit(0, CR0_VECTOR_BIT);
229 if (test_facility(130))
230 get_lowcore()->machine_flags |= MACHINE_FLAG_NX;
231 if (test_facility(133))
232 get_lowcore()->machine_flags |= MACHINE_FLAG_GS;
233 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
234 /* Enabled signed clock comparator comparisons */
235 get_lowcore()->machine_flags |= MACHINE_FLAG_SCC;
236 clock_comparator_max = -1ULL >> 1;
237 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT);
238 }
239 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
240 get_lowcore()->machine_flags |= MACHINE_FLAG_PCI_MIO;
241 /* the control bit is set during PCI initialization */
242 }
243 if (test_facility(194))
244 get_lowcore()->machine_flags |= MACHINE_FLAG_RDP;
245 }
246
247 static inline void save_vector_registers(void)
248 {
249 #ifdef CONFIG_CRASH_DUMP
250 if (test_facility(129))
251 save_vx_regs(boot_cpu_vector_save_area);
252 #endif
253 }
254
255 static inline void setup_low_address_protection(void)
256 {
257 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
258 }
259
260 static inline void setup_access_registers(void)
261 {
262 unsigned int acrs[NUM_ACRS] = { 0 };
263
264 restore_access_regs(acrs);
265 }
266
267 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
268 static void __init setup_boot_command_line(void)
269 {
270 /* copy arch command line */
271 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
272 }
273
274 static void __init sort_amode31_extable(void)
275 {
276 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
277 }
278
279 void __init startup_init(void)
280 {
281 kasan_early_init();
282 reset_tod_clock();
283 time_early_init();
284 init_kernel_storage_key();
285 lockdep_off();
286 sort_amode31_extable();
287 setup_lowcore_early();
288 detect_machine_type();
289 setup_arch_string();
290 setup_boot_command_line();
291 detect_diag9c();
292 detect_machine_facilities();
293 save_vector_registers();
294 setup_topology();
295 sclp_early_detect();
296 setup_low_address_protection();
297 setup_access_registers();
298 lockdep_on();
299 }
300
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