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/ftrace.h>
16 #include <linux/lockdep.h>
17 #include <linux/module.h>
18 #include <linux/pfn.h>
19 #include <linux/uaccess.h>
20 #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"
84 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
87 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
89 static noinline __init void create_kernel_nss(void)
91 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
92 #ifdef CONFIG_BLK_DEV_INITRD
93 unsigned int sinitrd_pfn, einitrd_pfn;
99 char defsys_cmd[DEFSYS_CMD_SIZE];
100 char savesys_cmd[SAVESYS_CMD_SIZE];
102 /* Do nothing if we are not running under VM */
106 /* Convert COMMAND_LINE to upper case */
107 for (i = 0; i < strlen(boot_command_line); i++)
108 upper_command_line[i] = toupper(boot_command_line[i]);
110 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
115 savesys_ptr += 8; /* Point to the beginning of the NSS name */
116 for (i = 0; i < NSS_NAME_SIZE; i++) {
117 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
119 kernel_nss_name[i] = savesys_ptr[i];
122 stext_pfn = PFN_DOWN(__pa(&_stext));
123 eshared_pfn = PFN_DOWN(__pa(&_eshared));
124 end_pfn = PFN_UP(__pa(&_end));
125 min_size = end_pfn << 2;
127 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
128 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
129 kernel_nss_name, stext_pfn - 1, stext_pfn,
130 eshared_pfn - 1, eshared_pfn, end_pfn);
132 #ifdef CONFIG_BLK_DEV_INITRD
133 if (INITRD_START && INITRD_SIZE) {
134 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
135 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
136 min_size = einitrd_pfn << 2;
137 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
138 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
142 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
143 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
144 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
145 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
146 kernel_nss_name, kernel_nss_name);
147 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
149 __cpcmd(defsys_cmd, NULL, 0, &response);
152 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
154 kernel_nss_name[0] = '\0';
158 len = strlen(savesys_cmd);
159 ASCEBC(savesys_cmd, len);
160 response = savesys_ipl_nss(savesys_cmd, len);
162 /* On success: response is equal to the command size,
163 * max SAVESYS_CMD_SIZE
164 * On error: response contains the numeric portion of cp error message.
165 * for SAVESYS it will be >= 263
166 * for missing privilege class, it will be 1
168 if (response > SAVESYS_CMD_SIZE || response == 1) {
169 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
171 kernel_nss_name[0] = '\0';
175 /* re-initialize cputime accounting. */
176 sched_clock_base_cc = get_tod_clock();
177 S390_lowcore.last_update_clock = sched_clock_base_cc;
178 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
179 S390_lowcore.user_timer = 0;
180 S390_lowcore.system_timer = 0;
181 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
183 /* re-setup boot command line with new ipl vm parms */
184 ipl_update_parameters();
185 setup_boot_command_line();
187 ipl_flags = IPL_NSS_VALID;
190 #else /* CONFIG_SHARED_KERNEL */
192 static inline void create_kernel_nss(void) { }
194 #endif /* CONFIG_SHARED_KERNEL */
199 static noinline __init void clear_bss_section(void)
201 memset(__bss_start, 0, __bss_stop - __bss_start);
205 * Initialize storage key for kernel pages
207 static noinline __init void init_kernel_storage_key(void)
210 unsigned long end_pfn, init_pfn;
212 end_pfn = PFN_UP(__pa(&_end));
214 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
215 page_set_storage_key(init_pfn << PAGE_SHIFT,
216 PAGE_DEFAULT_KEY, 0);
220 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
222 static noinline __init void detect_machine_type(void)
224 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
226 /* Check current-configuration-level */
227 if (stsi(NULL, 0, 0, 0) <= 2) {
228 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
231 /* Get virtual-machine cpu information. */
232 if (stsi(vmms, 3, 2, 2) || !vmms->count)
235 /* Running under KVM? If not we assume z/VM */
236 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
237 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
239 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
242 static __init void setup_topology(void)
247 if (!test_facility(11))
249 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
250 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
251 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
254 topology_max_mnest = max_mnest;
258 static void early_pgm_check_handler(void)
260 const struct exception_table_entry *fixup;
263 addr = S390_lowcore.program_old_psw.addr;
264 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
267 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
270 static noinline __init void setup_lowcore_early(void)
274 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
275 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
276 S390_lowcore.external_new_psw = psw;
277 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
278 S390_lowcore.program_new_psw = psw;
279 s390_base_pgm_handler_fn = early_pgm_check_handler;
282 static noinline __init void setup_facility_list(void)
284 stfle(S390_lowcore.stfle_fac_list,
285 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
288 static __init void detect_mvpg(void)
299 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
301 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
305 static __init void detect_ieee(void)
315 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
317 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
321 static __init void detect_csp(void)
334 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
336 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
340 static __init void detect_diag9c(void)
342 unsigned int cpu_address;
345 cpu_address = stap();
351 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
353 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
356 static __init void detect_diag44(void)
366 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
368 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
372 static __init void detect_machine_facilities(void)
375 if (test_facility(8)) {
376 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
377 __ctl_set_bit(0, 23);
379 if (test_facility(78))
380 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
381 if (test_facility(3))
382 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
383 if (test_facility(40))
384 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
385 if (test_facility(50) && test_facility(73))
386 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
387 if (test_facility(66))
388 S390_lowcore.machine_flags |= MACHINE_FLAG_RRBM;
392 static __init void rescue_initrd(void)
394 #ifdef CONFIG_BLK_DEV_INITRD
395 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
397 * Just like in case of IPL from VM reader we make sure there is a
398 * gap of 4MB between end of kernel and start of initrd.
399 * That way we can also be sure that saving an NSS will succeed,
400 * which however only requires different segments.
402 if (!INITRD_START || !INITRD_SIZE)
404 if (INITRD_START >= min_initrd_addr)
406 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
407 INITRD_START = min_initrd_addr;
411 /* Set up boot command line */
412 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
417 len = strlen(boot_command_line);
419 delim = boot_command_line + len; /* '\0' character position */
420 parm = boot_command_line + len + 1; /* append right after '\0' */
422 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
425 memmove(boot_command_line, parm + 1, rc);
427 *delim = ' '; /* replace '\0' with space */
431 static inline int has_ebcdic_char(const char *str)
435 for (i = 0; str[i]; i++)
441 static void __init setup_boot_command_line(void)
443 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
444 /* convert arch command line to ascii if necessary */
445 if (has_ebcdic_char(COMMAND_LINE))
446 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
447 /* copy arch command line */
448 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
449 ARCH_COMMAND_LINE_SIZE);
451 /* append IPL PARM data to the boot command line */
453 append_to_cmdline(append_ipl_vmparm);
455 append_to_cmdline(append_ipl_scpdata);
459 * Save ipl parameters, clear bss memory, initialize storage keys
460 * and create a kernel NSS at startup if the SAVESYS= parm is defined
462 void __init startup_init(void)
465 ipl_save_parameters();
468 init_kernel_storage_key();
471 setup_lowcore_early();
472 setup_facility_list();
473 detect_machine_type();
474 ipl_update_parameters();
475 setup_boot_command_line();
482 detect_machine_facilities();
485 #ifdef CONFIG_DYNAMIC_FTRACE
486 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;