2 * arch/s390/kernel/early.c
4 * Copyright IBM Corp. 2007, 2009
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
9 #define KMSG_COMPONENT "setup"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/compiler.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/ctype.h>
17 #include <linux/ftrace.h>
18 #include <linux/lockdep.h>
19 #include <linux/module.h>
20 #include <linux/pfn.h>
21 #include <linux/uaccess.h>
22 #include <linux/kernel.h>
23 #include <asm/ebcdic.h>
25 #include <asm/lowcore.h>
26 #include <asm/processor.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/sysinfo.h>
30 #include <asm/cpcmd.h>
35 * Create a Kernel NSS if the SAVESYS= parameter is defined
37 #define DEFSYS_CMD_SIZE 128
38 #define SAVESYS_CMD_SIZE 32
40 char kernel_nss_name[NSS_NAME_SIZE + 1];
42 static void __init setup_boot_command_line(void);
45 * Get the TOD clock running.
47 static void __init reset_tod_clock(void)
51 if (store_clock(&time) == 0)
53 /* TOD clock not running. Set the clock to Unix Epoch. */
54 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
57 sched_clock_base_cc = TOD_UNIX_EPOCH;
58 S390_lowcore.last_update_clock = sched_clock_base_cc;
61 #ifdef CONFIG_SHARED_KERNEL
62 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
65 " .section .init.text,\"ax\",@progbits\n"
67 " .type savesys_ipl_nss, @function\n"
85 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
88 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
90 static noinline __init void create_kernel_nss(void)
92 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
93 #ifdef CONFIG_BLK_DEV_INITRD
94 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 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
128 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
129 eshared_pfn, end_pfn);
131 #ifdef CONFIG_BLK_DEV_INITRD
132 if (INITRD_START && INITRD_SIZE) {
133 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
134 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
135 min_size = einitrd_pfn << 2;
136 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
137 sinitrd_pfn, einitrd_pfn);
141 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
142 defsys_cmd, min_size);
143 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
144 kernel_nss_name, kernel_nss_name);
146 __cpcmd(defsys_cmd, NULL, 0, &response);
149 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
151 kernel_nss_name[0] = '\0';
155 len = strlen(savesys_cmd);
156 ASCEBC(savesys_cmd, len);
157 response = savesys_ipl_nss(savesys_cmd, len);
159 /* On success: response is equal to the command size,
160 * max SAVESYS_CMD_SIZE
161 * On error: response contains the numeric portion of cp error message.
162 * for SAVESYS it will be >= 263
163 * for missing privilege class, it will be 1
165 if (response > SAVESYS_CMD_SIZE || response == 1) {
166 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
168 kernel_nss_name[0] = '\0';
172 /* re-initialize cputime accounting. */
173 sched_clock_base_cc = get_clock();
174 S390_lowcore.last_update_clock = sched_clock_base_cc;
175 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
176 S390_lowcore.user_timer = 0;
177 S390_lowcore.system_timer = 0;
178 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
180 /* re-setup boot command line with new ipl vm parms */
181 ipl_update_parameters();
182 setup_boot_command_line();
184 ipl_flags = IPL_NSS_VALID;
187 #else /* CONFIG_SHARED_KERNEL */
189 static inline void create_kernel_nss(void) { }
191 #endif /* CONFIG_SHARED_KERNEL */
196 static noinline __init void clear_bss_section(void)
198 memset(__bss_start, 0, __bss_stop - __bss_start);
202 * Initialize storage key for kernel pages
204 static noinline __init void init_kernel_storage_key(void)
206 unsigned long end_pfn, init_pfn;
208 end_pfn = PFN_UP(__pa(&_end));
210 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
211 page_set_storage_key(init_pfn << PAGE_SHIFT,
212 PAGE_DEFAULT_KEY, 0);
215 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
217 static noinline __init void detect_machine_type(void)
219 /* Check current-configuration-level */
220 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
221 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
224 /* Get virtual-machine cpu information. */
225 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count)
228 /* Running under KVM? If not we assume z/VM */
229 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
230 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
232 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
235 static __init void early_pgm_check_handler(void)
238 const struct exception_table_entry *fixup;
240 addr = S390_lowcore.program_old_psw.addr;
241 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
244 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
247 static noinline __init void setup_lowcore_early(void)
251 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
252 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
253 S390_lowcore.external_new_psw = psw;
254 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
255 S390_lowcore.program_new_psw = psw;
256 s390_base_pgm_handler_fn = early_pgm_check_handler;
259 static noinline __init void setup_facility_list(void)
263 S390_lowcore.stfl_fac_list = 0;
265 " .insn s,0xb2b10000,0(0)\n" /* stfl */
267 EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
268 memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
269 nr = 4; /* # bytes stored by stfl */
270 if (test_facility(7)) {
271 /* More facility bits available with stfle */
272 register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
273 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
274 : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
276 nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
278 memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
279 MAX_FACILITY_BIT/8 - nr);
282 static noinline __init void setup_hpage(void)
284 #ifndef CONFIG_DEBUG_PAGEALLOC
285 if (!test_facility(2) || !test_facility(8))
287 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
288 __ctl_set_bit(0, 23);
292 static __init void detect_mvpg(void)
303 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
305 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
309 static __init void detect_ieee(void)
319 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
321 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
325 static __init void detect_csp(void)
338 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
340 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
344 static __init void detect_diag9c(void)
346 unsigned int cpu_address;
349 cpu_address = stap();
355 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
357 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
360 static __init void detect_diag44(void)
370 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
372 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
376 static __init void detect_machine_facilities(void)
379 if (test_facility(3))
380 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
381 if (test_facility(8))
382 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
383 if (test_facility(11))
384 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
385 if (test_facility(27))
386 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
387 if (test_facility(40))
388 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
392 static __init void rescue_initrd(void)
394 #ifdef CONFIG_BLK_DEV_INITRD
396 * Move the initrd right behind the bss section in case it starts
397 * within the bss section. So we don't overwrite it when the bss
398 * section gets cleared.
400 if (!INITRD_START || !INITRD_SIZE)
402 if (INITRD_START >= (unsigned long) __bss_stop)
404 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
405 INITRD_START = (unsigned long) __bss_stop;
409 /* Set up boot command line */
410 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
415 len = strlen(boot_command_line);
417 delim = boot_command_line + len; /* '\0' character position */
418 parm = boot_command_line + len + 1; /* append right after '\0' */
420 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
423 memmove(boot_command_line, parm + 1, rc);
425 *delim = ' '; /* replace '\0' with space */
429 static void __init setup_boot_command_line(void)
433 /* convert arch command line to ascii */
434 for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++)
435 if (COMMAND_LINE[i] & 0x80)
437 if (i < ARCH_COMMAND_LINE_SIZE)
438 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
439 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0;
441 /* copy arch command line */
442 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
443 ARCH_COMMAND_LINE_SIZE);
445 /* append IPL PARM data to the boot command line */
447 append_to_cmdline(append_ipl_vmparm);
449 append_to_cmdline(append_ipl_scpdata);
454 * Save ipl parameters, clear bss memory, initialize storage keys
455 * and create a kernel NSS at startup if the SAVESYS= parm is defined
457 void __init startup_init(void)
460 ipl_save_parameters();
463 init_kernel_storage_key();
467 setup_lowcore_early();
468 setup_facility_list();
469 detect_machine_type();
470 ipl_update_parameters();
471 setup_boot_command_line();
478 detect_machine_facilities();
480 sclp_facilities_detect();
481 detect_memory_layout(memory_chunk);
482 #ifdef CONFIG_DYNAMIC_FTRACE
483 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;