1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
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>
22 #include <asm/ebcdic.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>
31 #include <asm/facility.h>
32 #include <asm/boot_data.h>
33 #include <asm/switch_to.h>
36 int __bootdata(is_full_image);
38 static void __init reset_tod_clock(void)
42 if (store_tod_clock_ext_cc(&clk) == 0)
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))
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;
54 * Initialize storage key for kernel pages
56 static noinline __init void init_kernel_storage_key(void)
59 unsigned long end_pfn, init_pfn;
61 end_pfn = PFN_UP(__pa(_end));
63 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
64 page_set_storage_key(init_pfn << PAGE_SHIFT,
69 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
71 static noinline __init void detect_machine_type(void)
73 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
75 /* Check current-configuration-level */
76 if (stsi(NULL, 0, 0, 0) <= 2) {
77 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
80 /* Get virtual-machine cpu information. */
81 if (stsi(vmms, 3, 2, 2) || !vmms->count)
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;
91 /* Remove leading, trailing and double whitespace. */
92 static inline void strim_all(char *str)
98 memmove(str, s, strlen(s));
100 if (!isspace(*str++))
103 s = skip_spaces(str);
104 memmove(str, s, strlen(s) + 1);
109 static noinline __init void setup_arch_string(void)
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];
115 if (stsi(mach, 1, 1, 1))
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);
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);
131 MACHINE_IS_LPAR ? "LPAR" :
132 MACHINE_IS_VM ? "z/VM" :
133 MACHINE_IS_KVM ? "KVM" : "unknown");
135 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
138 static __init void setup_topology(void)
142 if (!test_facility(11))
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)
149 topology_max_mnest = max_mnest;
152 void __do_early_pgm_check(struct pt_regs *regs)
154 if (!fixup_exception(regs))
158 static noinline __init void setup_lowcore_early(void)
162 psw.addr = (unsigned long)early_pgm_check_handler;
163 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
164 if (IS_ENABLED(CONFIG_KASAN))
165 psw.mask |= PSW_MASK_DAT;
166 S390_lowcore.program_new_psw = psw;
167 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
170 static noinline __init void setup_facility_list(void)
172 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
173 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
174 __clear_facility(82, alt_stfle_fac_list);
177 static __init void detect_diag9c(void)
179 unsigned int cpu_address;
182 cpu_address = stap();
183 diag_stat_inc(DIAG_STAT_X09C);
189 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
191 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
194 static __init void detect_machine_facilities(void)
196 if (test_facility(8)) {
197 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
198 __ctl_set_bit(0, 23);
200 if (test_facility(78))
201 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
202 if (test_facility(3))
203 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
204 if (test_facility(50) && test_facility(73)) {
205 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
206 __ctl_set_bit(0, 55);
208 if (test_facility(51))
209 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
210 if (test_facility(129)) {
211 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
212 __ctl_set_bit(0, 17);
214 if (test_facility(130) && !noexec_disabled) {
215 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
216 __ctl_set_bit(0, 20);
218 if (test_facility(133))
219 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
220 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
221 /* Enabled signed clock comparator comparisons */
222 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
223 clock_comparator_max = -1ULL >> 1;
224 __ctl_set_bit(0, 53);
226 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
228 /* the control bit is set during PCI initialization */
232 static inline void save_vector_registers(void)
234 #ifdef CONFIG_CRASH_DUMP
235 if (test_facility(129))
236 save_vx_regs(boot_cpu_vector_save_area);
240 static inline void setup_control_registers(void)
244 __ctl_store(reg, 0, 0);
245 reg |= CR0_LOW_ADDRESS_PROTECTION;
246 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
247 reg |= CR0_EXTERNAL_CALL_SUBMASK;
248 __ctl_load(reg, 0, 0);
251 static inline void setup_access_registers(void)
253 unsigned int acrs[NUM_ACRS] = { 0 };
255 restore_access_regs(acrs);
258 static int __init disable_vector_extension(char *str)
260 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
261 __ctl_clear_bit(0, 17);
264 early_param("novx", disable_vector_extension);
266 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
267 static void __init setup_boot_command_line(void)
269 /* copy arch command line */
270 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
273 static void __init check_image_bootable(void)
278 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
279 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
280 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
284 static void __init sort_amode31_extable(void)
286 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
289 void __init startup_init(void)
292 check_image_bootable();
294 init_kernel_storage_key();
296 sort_amode31_extable();
297 setup_lowcore_early();
298 setup_facility_list();
299 detect_machine_type();
301 setup_boot_command_line();
303 detect_machine_facilities();
304 save_vector_registers();
307 setup_control_registers();
308 setup_access_registers();