2 * Copyright IBM Corp. 2007, 2009
3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
4 * Heiko Carstens <heiko.carstens@de.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>
21 #include <asm/ebcdic.h>
23 #include <asm/lowcore.h>
24 #include <asm/processor.h>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sysinfo.h>
28 #include <asm/cpcmd.h>
30 #include <asm/facility.h>
34 * Create a Kernel NSS if the SAVESYS= parameter is defined
36 #define DEFSYS_CMD_SIZE 128
37 #define SAVESYS_CMD_SIZE 32
39 char kernel_nss_name[NSS_NAME_SIZE + 1];
41 static void __init setup_boot_command_line(void);
44 * Get the TOD clock running.
46 static void __init reset_tod_clock(void)
50 if (store_tod_clock(&time) == 0)
52 /* TOD clock not running. Set the clock to Unix Epoch. */
53 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
56 sched_clock_base_cc = TOD_UNIX_EPOCH;
57 S390_lowcore.last_update_clock = sched_clock_base_cc;
60 #ifdef CONFIG_SHARED_KERNEL
61 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
64 " .section .init.text,\"ax\",@progbits\n"
66 " .type savesys_ipl_nss, @function\n"
76 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
79 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
81 static noinline __init void create_kernel_nss(void)
83 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
84 #ifdef CONFIG_BLK_DEV_INITRD
85 unsigned int sinitrd_pfn, einitrd_pfn;
91 char defsys_cmd[DEFSYS_CMD_SIZE];
92 char savesys_cmd[SAVESYS_CMD_SIZE];
94 /* Do nothing if we are not running under VM */
98 /* Convert COMMAND_LINE to upper case */
99 for (i = 0; i < strlen(boot_command_line); i++)
100 upper_command_line[i] = toupper(boot_command_line[i]);
102 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
107 savesys_ptr += 8; /* Point to the beginning of the NSS name */
108 for (i = 0; i < NSS_NAME_SIZE; i++) {
109 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
111 kernel_nss_name[i] = savesys_ptr[i];
114 stext_pfn = PFN_DOWN(__pa(&_stext));
115 eshared_pfn = PFN_DOWN(__pa(&_eshared));
116 end_pfn = PFN_UP(__pa(&_end));
117 min_size = end_pfn << 2;
119 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
120 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
121 kernel_nss_name, stext_pfn - 1, stext_pfn,
122 eshared_pfn - 1, eshared_pfn, end_pfn);
124 #ifdef CONFIG_BLK_DEV_INITRD
125 if (INITRD_START && INITRD_SIZE) {
126 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
127 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
128 min_size = einitrd_pfn << 2;
129 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
130 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
134 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
135 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
136 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
137 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
138 kernel_nss_name, kernel_nss_name);
139 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
141 __cpcmd(defsys_cmd, NULL, 0, &response);
144 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
146 kernel_nss_name[0] = '\0';
150 len = strlen(savesys_cmd);
151 ASCEBC(savesys_cmd, len);
152 response = savesys_ipl_nss(savesys_cmd, len);
154 /* On success: response is equal to the command size,
155 * max SAVESYS_CMD_SIZE
156 * On error: response contains the numeric portion of cp error message.
157 * for SAVESYS it will be >= 263
158 * for missing privilege class, it will be 1
160 if (response > SAVESYS_CMD_SIZE || response == 1) {
161 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
163 kernel_nss_name[0] = '\0';
167 /* re-initialize cputime accounting. */
168 sched_clock_base_cc = get_tod_clock();
169 S390_lowcore.last_update_clock = sched_clock_base_cc;
170 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
171 S390_lowcore.user_timer = 0;
172 S390_lowcore.system_timer = 0;
173 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
175 /* re-setup boot command line with new ipl vm parms */
176 ipl_update_parameters();
177 setup_boot_command_line();
179 ipl_flags = IPL_NSS_VALID;
182 #else /* CONFIG_SHARED_KERNEL */
184 static inline void create_kernel_nss(void) { }
186 #endif /* CONFIG_SHARED_KERNEL */
191 static noinline __init void clear_bss_section(void)
193 memset(__bss_start, 0, __bss_stop - __bss_start);
197 * Initialize storage key for kernel pages
199 static noinline __init void init_kernel_storage_key(void)
202 unsigned long end_pfn, init_pfn;
204 end_pfn = PFN_UP(__pa(&_end));
206 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
207 page_set_storage_key(init_pfn << PAGE_SHIFT,
208 PAGE_DEFAULT_KEY, 0);
212 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
214 static noinline __init void detect_machine_type(void)
216 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
218 /* Check current-configuration-level */
219 if (stsi(NULL, 0, 0, 0) <= 2) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
223 /* Get virtual-machine cpu information. */
224 if (stsi(vmms, 3, 2, 2) || !vmms->count)
227 /* Detect known hypervisors */
228 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
230 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
234 static noinline __init void setup_arch_string(void)
236 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
238 if (stsi(mach, 1, 1, 1))
240 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
241 EBCASC(mach->type, sizeof(mach->type));
242 EBCASC(mach->model, sizeof(mach->model));
243 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
244 dump_stack_set_arch_desc("%-16.16s %-4.4s %-16.16s %-16.16s (%s)",
248 mach->model_capacity,
249 MACHINE_IS_LPAR ? "LPAR" :
250 MACHINE_IS_VM ? "z/VM" :
251 MACHINE_IS_KVM ? "KVM" : "unknown");
254 static __init void setup_topology(void)
258 if (!test_facility(11))
260 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
261 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
262 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
265 topology_max_mnest = max_mnest;
268 static void early_pgm_check_handler(void)
270 const struct exception_table_entry *fixup;
271 unsigned long cr0, cr0_new;
274 addr = S390_lowcore.program_old_psw.addr;
275 fixup = search_exception_tables(addr);
278 /* Disable low address protection before storing into lowcore. */
279 __ctl_store(cr0, 0, 0);
280 cr0_new = cr0 & ~(1UL << 28);
281 __ctl_load(cr0_new, 0, 0);
282 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
283 __ctl_load(cr0, 0, 0);
286 static noinline __init void setup_lowcore_early(void)
290 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
291 if (IS_ENABLED(CONFIG_KASAN))
292 psw.mask |= PSW_MASK_DAT;
293 psw.addr = (unsigned long) s390_base_ext_handler;
294 S390_lowcore.external_new_psw = psw;
295 psw.addr = (unsigned long) s390_base_pgm_handler;
296 S390_lowcore.program_new_psw = psw;
297 s390_base_pgm_handler_fn = early_pgm_check_handler;
300 static noinline __init void setup_facility_list(void)
302 stfle(S390_lowcore.stfle_fac_list,
303 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
304 memcpy(S390_lowcore.alt_stfle_fac_list,
305 S390_lowcore.stfle_fac_list,
306 sizeof(S390_lowcore.alt_stfle_fac_list));
307 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
308 __clear_facility(82, S390_lowcore.alt_stfle_fac_list);
311 static __init void detect_diag9c(void)
313 unsigned int cpu_address;
316 cpu_address = stap();
317 diag_stat_inc(DIAG_STAT_X09C);
323 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
325 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
328 static __init void detect_diag44(void)
332 diag_stat_inc(DIAG_STAT_X044);
338 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
340 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
343 static __init void detect_machine_facilities(void)
345 if (test_facility(8)) {
346 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
347 __ctl_set_bit(0, 23);
349 if (test_facility(78))
350 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
351 if (test_facility(3))
352 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
353 if (test_facility(40))
354 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
355 if (test_facility(50) && test_facility(73)) {
356 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
357 __ctl_set_bit(0, 55);
359 if (test_facility(51))
360 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
361 if (test_facility(129)) {
362 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
363 __ctl_set_bit(0, 17);
367 static inline void save_vector_registers(void)
369 #ifdef CONFIG_CRASH_DUMP
370 if (test_facility(129))
371 save_vx_regs(boot_cpu_vector_save_area);
375 static int __init topology_setup(char *str)
380 rc = kstrtobool(str, &enabled);
382 S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY;
385 early_param("topology", topology_setup);
387 static int __init disable_vector_extension(char *str)
389 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
390 __ctl_clear_bit(0, 17);
393 early_param("novx", disable_vector_extension);
395 static int __init cad_setup(char *str)
399 get_option(&str, &val);
400 if (val && test_facility(128))
401 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
404 early_param("cad", cad_setup);
406 static int __init cad_init(void)
409 /* Enable problem state CAD. */
413 early_initcall(cad_init);
415 static __init void rescue_initrd(void)
417 #ifdef CONFIG_BLK_DEV_INITRD
418 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
420 * Just like in case of IPL from VM reader we make sure there is a
421 * gap of 4MB between end of kernel and start of initrd.
422 * That way we can also be sure that saving an NSS will succeed,
423 * which however only requires different segments.
425 if (!INITRD_START || !INITRD_SIZE)
427 if (INITRD_START >= min_initrd_addr)
429 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
430 INITRD_START = min_initrd_addr;
434 /* Set up boot command line */
435 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
440 len = strlen(boot_command_line);
442 delim = boot_command_line + len; /* '\0' character position */
443 parm = boot_command_line + len + 1; /* append right after '\0' */
445 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
448 memmove(boot_command_line, parm + 1, rc);
450 *delim = ' '; /* replace '\0' with space */
454 static inline int has_ebcdic_char(const char *str)
458 for (i = 0; str[i]; i++)
464 static void __init setup_boot_command_line(void)
466 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
467 /* convert arch command line to ascii if necessary */
468 if (has_ebcdic_char(COMMAND_LINE))
469 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
470 /* copy arch command line */
471 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
472 ARCH_COMMAND_LINE_SIZE);
474 /* append IPL PARM data to the boot command line */
476 append_to_cmdline(append_ipl_vmparm);
478 append_to_cmdline(append_ipl_scpdata);
482 * Save ipl parameters, clear bss memory, initialize storage keys
483 * and create a kernel NSS at startup if the SAVESYS= parm is defined
485 void __init startup_init(void)
488 ipl_save_parameters();
492 init_kernel_storage_key();
494 setup_lowcore_early();
495 setup_facility_list();
496 detect_machine_type();
498 ipl_update_parameters();
499 setup_boot_command_line();
503 detect_machine_facilities();
504 save_vector_registers();