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 /* Running under KVM? If not we assume z/VM */
68 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
69 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
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 psw.addr = (unsigned long) s390_base_ext_handler;
159 S390_lowcore.external_new_psw = psw;
160 psw.addr = (unsigned long) s390_base_pgm_handler;
161 S390_lowcore.program_new_psw = psw;
162 s390_base_pgm_handler_fn = early_pgm_check_handler;
163 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
166 static noinline __init void setup_facility_list(void)
168 stfle(S390_lowcore.stfle_fac_list,
169 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
170 memcpy(S390_lowcore.alt_stfle_fac_list,
171 S390_lowcore.stfle_fac_list,
172 sizeof(S390_lowcore.alt_stfle_fac_list));
173 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
174 __clear_facility(82, S390_lowcore.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_diag44(void)
198 diag_stat_inc(DIAG_STAT_X044);
204 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
206 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
209 static __init void detect_machine_facilities(void)
211 if (test_facility(8)) {
212 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
213 __ctl_set_bit(0, 23);
215 if (test_facility(78))
216 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
217 if (test_facility(3))
218 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
219 if (test_facility(50) && test_facility(73)) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
221 __ctl_set_bit(0, 55);
223 if (test_facility(51))
224 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
225 if (test_facility(129)) {
226 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
227 __ctl_set_bit(0, 17);
229 if (test_facility(130)) {
230 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
231 __ctl_set_bit(0, 20);
233 if (test_facility(133))
234 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
235 if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
236 /* Enabled signed clock comparator comparisons */
237 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
238 clock_comparator_max = -1ULL >> 1;
239 __ctl_set_bit(0, 53);
243 static inline void save_vector_registers(void)
245 #ifdef CONFIG_CRASH_DUMP
246 if (test_facility(129))
247 save_vx_regs(boot_cpu_vector_save_area);
251 static int __init disable_vector_extension(char *str)
253 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
254 __ctl_clear_bit(0, 17);
257 early_param("novx", disable_vector_extension);
259 static int __init noexec_setup(char *str)
264 rc = kstrtobool(str, &enabled);
265 if (!rc && !enabled) {
266 /* Disable no-execute support */
267 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
268 __ctl_clear_bit(0, 20);
272 early_param("noexec", noexec_setup);
274 static int __init cad_setup(char *str)
279 rc = kstrtobool(str, &enabled);
280 if (!rc && enabled && test_facility(128))
281 /* Enable problem state CAD. */
285 early_param("cad", cad_setup);
287 /* Set up boot command line */
288 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
293 len = strlen(boot_command_line);
295 delim = boot_command_line + len; /* '\0' character position */
296 parm = boot_command_line + len + 1; /* append right after '\0' */
298 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
301 memmove(boot_command_line, parm + 1, rc);
303 *delim = ' '; /* replace '\0' with space */
307 static inline int has_ebcdic_char(const char *str)
311 for (i = 0; str[i]; i++)
317 static void __init setup_boot_command_line(void)
319 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
320 /* convert arch command line to ascii if necessary */
321 if (has_ebcdic_char(COMMAND_LINE))
322 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
323 /* copy arch command line */
324 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
325 ARCH_COMMAND_LINE_SIZE);
327 /* append IPL PARM data to the boot command line */
329 append_to_cmdline(append_ipl_vmparm);
331 append_to_cmdline(append_ipl_scpdata);
334 void __init startup_init(void)
337 init_kernel_storage_key();
339 setup_lowcore_early();
340 setup_facility_list();
341 detect_machine_type();
343 ipl_store_parameters();
344 setup_boot_command_line();
347 detect_machine_facilities();
348 save_vector_registers();