1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>
8 #define KMSG_COMPONENT "setup"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
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>
34 static void __init setup_boot_command_line(void);
37 * Initialize storage key for kernel pages
39 static noinline __init void init_kernel_storage_key(void)
42 unsigned long end_pfn, init_pfn;
44 end_pfn = PFN_UP(__pa(_end));
46 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
47 page_set_storage_key(init_pfn << PAGE_SHIFT,
52 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
54 static noinline __init void detect_machine_type(void)
56 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
58 /* Check current-configuration-level */
59 if (stsi(NULL, 0, 0, 0) <= 2) {
60 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
63 /* Get virtual-machine cpu information. */
64 if (stsi(vmms, 3, 2, 2) || !vmms->count)
67 /* Detect known hypervisors */
68 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
69 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
70 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
71 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
74 /* Remove leading, trailing and double whitespace. */
75 static inline void strim_all(char *str)
81 memmove(str, s, strlen(s));
87 memmove(str, s, strlen(s) + 1);
92 static noinline __init void setup_arch_string(void)
94 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
95 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
96 char mstr[80], hvstr[17];
98 if (stsi(mach, 1, 1, 1))
100 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
101 EBCASC(mach->type, sizeof(mach->type));
102 EBCASC(mach->model, sizeof(mach->model));
103 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
104 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
105 mach->manufacturer, mach->type,
106 mach->model, mach->model_capacity);
108 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
109 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
110 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
114 MACHINE_IS_LPAR ? "LPAR" :
115 MACHINE_IS_VM ? "z/VM" :
116 MACHINE_IS_KVM ? "KVM" : "unknown");
118 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
121 static __init void setup_topology(void)
125 if (!test_facility(11))
127 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
128 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
129 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
132 topology_max_mnest = max_mnest;
135 static void early_pgm_check_handler(void)
137 const struct exception_table_entry *fixup;
138 unsigned long cr0, cr0_new;
141 addr = S390_lowcore.program_old_psw.addr;
142 fixup = search_exception_tables(addr);
145 /* Disable low address protection before storing into lowcore. */
146 __ctl_store(cr0, 0, 0);
147 cr0_new = cr0 & ~(1UL << 28);
148 __ctl_load(cr0_new, 0, 0);
149 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
150 __ctl_load(cr0, 0, 0);
153 static noinline __init void setup_lowcore_early(void)
157 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
158 if (IS_ENABLED(CONFIG_KASAN))
159 psw.mask |= PSW_MASK_DAT;
160 psw.addr = (unsigned long) s390_base_ext_handler;
161 S390_lowcore.external_new_psw = psw;
162 psw.addr = (unsigned long) s390_base_pgm_handler;
163 S390_lowcore.program_new_psw = psw;
164 s390_base_pgm_handler_fn = early_pgm_check_handler;
165 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
168 static noinline __init void setup_facility_list(void)
170 stfle(S390_lowcore.stfle_fac_list,
171 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
172 memcpy(S390_lowcore.alt_stfle_fac_list,
173 S390_lowcore.stfle_fac_list,
174 sizeof(S390_lowcore.alt_stfle_fac_list));
175 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
176 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
179 static __init void detect_diag9c(void)
181 unsigned int cpu_address;
184 cpu_address = stap();
185 diag_stat_inc(DIAG_STAT_X09C);
191 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
193 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
196 static __init void detect_diag44(void)
200 diag_stat_inc(DIAG_STAT_X044);
206 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
208 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
211 static __init void detect_machine_facilities(void)
213 if (test_facility(8)) {
214 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
215 __ctl_set_bit(0, 23);
217 if (test_facility(78))
218 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
219 if (test_facility(3))
220 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
221 if (test_facility(50) && test_facility(73)) {
222 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
223 __ctl_set_bit(0, 55);
225 if (test_facility(51))
226 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
227 if (test_facility(129)) {
228 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
229 __ctl_set_bit(0, 17);
231 if (test_facility(130)) {
232 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
233 __ctl_set_bit(0, 20);
235 if (test_facility(133))
236 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
237 if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
238 /* Enabled signed clock comparator comparisons */
239 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
240 clock_comparator_max = -1ULL >> 1;
241 __ctl_set_bit(0, 53);
245 static inline void save_vector_registers(void)
247 #ifdef CONFIG_CRASH_DUMP
248 if (test_facility(129))
249 save_vx_regs(boot_cpu_vector_save_area);
253 static int __init disable_vector_extension(char *str)
255 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
256 __ctl_clear_bit(0, 17);
259 early_param("novx", disable_vector_extension);
261 static int __init noexec_setup(char *str)
266 rc = kstrtobool(str, &enabled);
267 if (!rc && !enabled) {
268 /* Disable no-execute support */
269 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
270 __ctl_clear_bit(0, 20);
274 early_param("noexec", noexec_setup);
276 static int __init cad_setup(char *str)
281 rc = kstrtobool(str, &enabled);
282 if (!rc && enabled && test_facility(128))
283 /* Enable problem state CAD. */
287 early_param("cad", cad_setup);
289 /* Set up boot command line */
290 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
295 len = strlen(boot_command_line);
297 delim = boot_command_line + len; /* '\0' character position */
298 parm = boot_command_line + len + 1; /* append right after '\0' */
300 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
303 memmove(boot_command_line, parm + 1, rc);
305 *delim = ' '; /* replace '\0' with space */
309 static inline int has_ebcdic_char(const char *str)
313 for (i = 0; str[i]; i++)
319 static void __init setup_boot_command_line(void)
321 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
322 /* convert arch command line to ascii if necessary */
323 if (has_ebcdic_char(COMMAND_LINE))
324 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
325 /* copy arch command line */
326 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
327 ARCH_COMMAND_LINE_SIZE);
329 /* append IPL PARM data to the boot command line */
331 append_to_cmdline(append_ipl_vmparm);
333 append_to_cmdline(append_ipl_scpdata);
336 static void __init check_image_bootable(void)
338 if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
341 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
342 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
343 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
344 disabled_wait(0xbadb007);
347 void __init startup_init(void)
349 check_image_bootable();
351 init_kernel_storage_key();
353 setup_lowcore_early();
354 setup_facility_list();
355 detect_machine_type();
357 ipl_store_parameters();
358 setup_boot_command_line();
361 detect_machine_facilities();
362 save_vector_registers();