1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2007, 2009
7 #define KMSG_COMPONENT "setup"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
23 #include <asm/ebcdic.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>
32 #include <asm/facility.h>
33 #include <asm/boot_data.h>
34 #include <asm/switch_to.h>
37 #define decompressor_handled_param(param) \
38 static int __init ignore_decompressor_param_##param(char *s) \
42 early_param(#param, ignore_decompressor_param_##param)
44 decompressor_handled_param(mem);
45 decompressor_handled_param(vmalloc);
46 decompressor_handled_param(dfltcc);
47 decompressor_handled_param(noexec);
48 decompressor_handled_param(facilities);
49 decompressor_handled_param(nokaslr);
50 #if IS_ENABLED(CONFIG_KVM)
51 decompressor_handled_param(prot_virt);
54 static void __init kasan_early_init(void)
57 init_task.kasan_depth = 0;
58 sclp_early_printk("KernelAddressSanitizer initialized\n");
62 static void __init reset_tod_clock(void)
66 if (store_tod_clock_ext_cc(&clk) == 0)
68 /* TOD clock not running. Set the clock to Unix Epoch. */
69 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
72 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
73 tod_clock_base.tod = TOD_UNIX_EPOCH;
74 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
78 * Initialize storage key for kernel pages
80 static noinline __init void init_kernel_storage_key(void)
83 unsigned long end_pfn, init_pfn;
85 end_pfn = PFN_UP(__pa(_end));
87 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
88 page_set_storage_key(init_pfn << PAGE_SHIFT,
93 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
95 static noinline __init void detect_machine_type(void)
97 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
99 /* Check current-configuration-level */
100 if (stsi(NULL, 0, 0, 0) <= 2) {
101 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
104 /* Get virtual-machine cpu information. */
105 if (stsi(vmms, 3, 2, 2) || !vmms->count)
108 /* Detect known hypervisors */
109 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
110 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
111 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
112 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
115 /* Remove leading, trailing and double whitespace. */
116 static inline void strim_all(char *str)
122 memmove(str, s, strlen(s));
124 if (!isspace(*str++))
127 s = skip_spaces(str);
128 memmove(str, s, strlen(s) + 1);
133 static noinline __init void setup_arch_string(void)
135 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
136 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
137 char mstr[80], hvstr[17];
139 if (stsi(mach, 1, 1, 1))
141 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
142 EBCASC(mach->type, sizeof(mach->type));
143 EBCASC(mach->model, sizeof(mach->model));
144 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
145 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
146 mach->manufacturer, mach->type,
147 mach->model, mach->model_capacity);
149 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
150 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
151 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
155 MACHINE_IS_LPAR ? "LPAR" :
156 MACHINE_IS_VM ? "z/VM" :
157 MACHINE_IS_KVM ? "KVM" : "unknown");
159 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
162 static __init void setup_topology(void)
166 if (!test_facility(11))
168 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
169 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
170 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
173 topology_max_mnest = max_mnest;
176 void __do_early_pgm_check(struct pt_regs *regs)
178 if (!fixup_exception(regs))
182 static noinline __init void setup_lowcore_early(void)
186 psw.addr = (unsigned long)early_pgm_check_handler;
187 psw.mask = PSW_KERNEL_BITS;
188 S390_lowcore.program_new_psw = psw;
189 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
192 static noinline __init void setup_facility_list(void)
194 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
195 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
196 __clear_facility(82, alt_stfle_fac_list);
199 static __init void detect_diag9c(void)
201 unsigned int cpu_address;
204 cpu_address = stap();
205 diag_stat_inc(DIAG_STAT_X09C);
211 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
213 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
216 static __init void detect_machine_facilities(void)
218 if (test_facility(8)) {
219 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
220 __ctl_set_bit(0, 23);
222 if (test_facility(78))
223 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
224 if (test_facility(3))
225 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
226 if (test_facility(50) && test_facility(73)) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
228 __ctl_set_bit(0, 55);
230 if (test_facility(51))
231 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
232 if (test_facility(129)) {
233 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
234 __ctl_set_bit(0, 17);
236 if (test_facility(130) && !noexec_disabled) {
237 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
238 __ctl_set_bit(0, 20);
240 if (test_facility(133))
241 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
242 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
243 /* Enabled signed clock comparator comparisons */
244 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
245 clock_comparator_max = -1ULL >> 1;
246 __ctl_set_bit(0, 53);
248 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
249 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
250 /* the control bit is set during PCI initialization */
252 if (test_facility(194))
253 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP;
256 static inline void save_vector_registers(void)
258 #ifdef CONFIG_CRASH_DUMP
259 if (test_facility(129))
260 save_vx_regs(boot_cpu_vector_save_area);
264 static inline void setup_control_registers(void)
268 __ctl_store(reg, 0, 0);
269 reg |= CR0_LOW_ADDRESS_PROTECTION;
270 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
271 reg |= CR0_EXTERNAL_CALL_SUBMASK;
272 __ctl_load(reg, 0, 0);
275 static inline void setup_access_registers(void)
277 unsigned int acrs[NUM_ACRS] = { 0 };
279 restore_access_regs(acrs);
282 static int __init disable_vector_extension(char *str)
284 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
285 __ctl_clear_bit(0, 17);
288 early_param("novx", disable_vector_extension);
290 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
291 static void __init setup_boot_command_line(void)
293 /* copy arch command line */
294 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
297 static void __init sort_amode31_extable(void)
299 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
302 void __init startup_init(void)
307 init_kernel_storage_key();
309 sort_amode31_extable();
310 setup_lowcore_early();
311 setup_facility_list();
312 detect_machine_type();
314 setup_boot_command_line();
316 detect_machine_facilities();
317 save_vector_registers();
320 setup_control_registers();
321 setup_access_registers();