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>
32 #include <asm/boot_data.h>
36 * Initialize storage key for kernel pages
38 static noinline __init void init_kernel_storage_key(void)
41 unsigned long end_pfn, init_pfn;
43 end_pfn = PFN_UP(__pa(_end));
45 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
46 page_set_storage_key(init_pfn << PAGE_SHIFT,
51 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
53 static noinline __init void detect_machine_type(void)
55 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
57 /* Check current-configuration-level */
58 if (stsi(NULL, 0, 0, 0) <= 2) {
59 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
62 /* Get virtual-machine cpu information. */
63 if (stsi(vmms, 3, 2, 2) || !vmms->count)
66 /* Detect known hypervisors */
67 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
68 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
69 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
70 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
73 /* Remove leading, trailing and double whitespace. */
74 static inline void strim_all(char *str)
80 memmove(str, s, strlen(s));
86 memmove(str, s, strlen(s) + 1);
91 static noinline __init void setup_arch_string(void)
93 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
94 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
95 char mstr[80], hvstr[17];
97 if (stsi(mach, 1, 1, 1))
99 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
100 EBCASC(mach->type, sizeof(mach->type));
101 EBCASC(mach->model, sizeof(mach->model));
102 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
103 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
104 mach->manufacturer, mach->type,
105 mach->model, mach->model_capacity);
107 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
108 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
109 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
113 MACHINE_IS_LPAR ? "LPAR" :
114 MACHINE_IS_VM ? "z/VM" :
115 MACHINE_IS_KVM ? "KVM" : "unknown");
117 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
120 static __init void setup_topology(void)
124 if (!test_facility(11))
126 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
127 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
128 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
131 topology_max_mnest = max_mnest;
134 static void early_pgm_check_handler(void)
136 const struct exception_table_entry *fixup;
137 unsigned long cr0, cr0_new;
140 addr = S390_lowcore.program_old_psw.addr;
141 fixup = search_exception_tables(addr);
144 /* Disable low address protection before storing into lowcore. */
145 __ctl_store(cr0, 0, 0);
146 cr0_new = cr0 & ~(1UL << 28);
147 __ctl_load(cr0_new, 0, 0);
148 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
149 __ctl_load(cr0, 0, 0);
152 static noinline __init void setup_lowcore_early(void)
156 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
157 psw.addr = (unsigned long) s390_base_ext_handler;
158 S390_lowcore.external_new_psw = psw;
159 psw.addr = (unsigned long) s390_base_pgm_handler;
160 S390_lowcore.program_new_psw = psw;
161 s390_base_pgm_handler_fn = early_pgm_check_handler;
162 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
165 static noinline __init void setup_facility_list(void)
167 memcpy(S390_lowcore.alt_stfle_fac_list,
168 S390_lowcore.stfle_fac_list,
169 sizeof(S390_lowcore.alt_stfle_fac_list));
170 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
171 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
174 static __init void detect_diag9c(void)
176 unsigned int cpu_address;
179 cpu_address = stap();
180 diag_stat_inc(DIAG_STAT_X09C);
186 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
188 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
191 static __init void detect_diag44(void)
195 diag_stat_inc(DIAG_STAT_X044);
201 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
203 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
206 static __init void detect_machine_facilities(void)
208 if (test_facility(8)) {
209 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
210 __ctl_set_bit(0, 23);
212 if (test_facility(78))
213 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
214 if (test_facility(3))
215 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
216 if (test_facility(50) && test_facility(73)) {
217 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
218 __ctl_set_bit(0, 55);
220 if (test_facility(51))
221 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
222 if (test_facility(129)) {
223 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
224 __ctl_set_bit(0, 17);
226 if (test_facility(130)) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
228 __ctl_set_bit(0, 20);
230 if (test_facility(133))
231 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
232 if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
233 /* Enabled signed clock comparator comparisons */
234 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
235 clock_comparator_max = -1ULL >> 1;
236 __ctl_set_bit(0, 53);
240 static inline void save_vector_registers(void)
242 #ifdef CONFIG_CRASH_DUMP
243 if (test_facility(129))
244 save_vx_regs(boot_cpu_vector_save_area);
248 static int __init disable_vector_extension(char *str)
250 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
251 __ctl_clear_bit(0, 17);
254 early_param("novx", disable_vector_extension);
256 static int __init noexec_setup(char *str)
261 rc = kstrtobool(str, &enabled);
262 if (!rc && !enabled) {
263 /* Disable no-execute support */
264 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
265 __ctl_clear_bit(0, 20);
269 early_param("noexec", noexec_setup);
271 static int __init cad_setup(char *str)
276 rc = kstrtobool(str, &enabled);
277 if (!rc && enabled && test_facility(128))
278 /* Enable problem state CAD. */
282 early_param("cad", cad_setup);
284 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
285 static void __init setup_boot_command_line(void)
287 /* copy arch command line */
288 strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
291 static void __init check_image_bootable(void)
293 if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
296 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
297 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
298 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
299 disabled_wait(0xbadb007);
302 void __init startup_init(void)
304 check_image_bootable();
306 init_kernel_storage_key();
308 setup_lowcore_early();
309 setup_facility_list();
310 detect_machine_type();
312 ipl_store_parameters();
313 setup_boot_command_line();
316 detect_machine_facilities();
317 save_vector_registers();