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TOMOYO Linux Cross Reference
Linux/arch/s390/kernel/early.c

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  1 /*
  2  *    Copyright IBM Corp. 2007, 2009
  3  *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
  4  *               Heiko Carstens <heiko.carstens@de.ibm.com>
  5  */
  6 
  7 #define KMSG_COMPONENT "setup"
  8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  9 
 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/module.h>
 17 #include <linux/pfn.h>
 18 #include <linux/uaccess.h>
 19 #include <linux/kernel.h>
 20 #include <asm/diag.h>
 21 #include <asm/ebcdic.h>
 22 #include <asm/ipl.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>
 29 #include <asm/sclp.h>
 30 #include <asm/facility.h>
 31 #include "entry.h"
 32 
 33 /*
 34  * Create a Kernel NSS if the SAVESYS= parameter is defined
 35  */
 36 #define DEFSYS_CMD_SIZE         128
 37 #define SAVESYS_CMD_SIZE        32
 38 
 39 char kernel_nss_name[NSS_NAME_SIZE + 1];
 40 
 41 static void __init setup_boot_command_line(void);
 42 
 43 /*
 44  * Get the TOD clock running.
 45  */
 46 static void __init reset_tod_clock(void)
 47 {
 48         u64 time;
 49 
 50         if (store_tod_clock(&time) == 0)
 51                 return;
 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)
 54                 disabled_wait(0);
 55 
 56         sched_clock_base_cc = TOD_UNIX_EPOCH;
 57         S390_lowcore.last_update_clock = sched_clock_base_cc;
 58 }
 59 
 60 #ifdef CONFIG_SHARED_KERNEL
 61 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
 62 
 63 asm(
 64         "       .section .init.text,\"ax\",@progbits\n"
 65         "       .align  4\n"
 66         "       .type   savesys_ipl_nss, @function\n"
 67         "savesys_ipl_nss:\n"
 68         "       stmg    6,15,48(15)\n"
 69         "       lgr     14,3\n"
 70         "       sam31\n"
 71         "       diag    2,14,0x8\n"
 72         "       sam64\n"
 73         "       lgr     2,14\n"
 74         "       lmg     6,15,48(15)\n"
 75         "       br      14\n"
 76         "       .size   savesys_ipl_nss, .-savesys_ipl_nss\n"
 77         "       .previous\n");
 78 
 79 static __initdata char upper_command_line[COMMAND_LINE_SIZE];
 80 
 81 static noinline __init void create_kernel_nss(void)
 82 {
 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;
 86 #endif
 87         int response;
 88         int hlen;
 89         size_t len;
 90         char *savesys_ptr;
 91         char defsys_cmd[DEFSYS_CMD_SIZE];
 92         char savesys_cmd[SAVESYS_CMD_SIZE];
 93 
 94         /* Do nothing if we are not running under VM */
 95         if (!MACHINE_IS_VM)
 96                 return;
 97 
 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]);
101 
102         savesys_ptr = strstr(upper_command_line, "SAVESYS=");
103 
104         if (!savesys_ptr)
105                 return;
106 
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')
110                         break;
111                 kernel_nss_name[i] = savesys_ptr[i];
112         }
113 
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;
118 
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);
123 
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);
131         }
132 #endif
133 
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';
140 
141         __cpcmd(defsys_cmd, NULL, 0, &response);
142 
143         if (response != 0) {
144                 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
145                         response);
146                 kernel_nss_name[0] = '\0';
147                 return;
148         }
149 
150         len = strlen(savesys_cmd);
151         ASCEBC(savesys_cmd, len);
152         response = savesys_ipl_nss(savesys_cmd, len);
153 
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
159          */
160         if (response > SAVESYS_CMD_SIZE || response == 1) {
161                 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
162                         response);
163                 kernel_nss_name[0] = '\0';
164                 return;
165         }
166 
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));
174 
175         /* re-setup boot command line with new ipl vm parms */
176         ipl_update_parameters();
177         setup_boot_command_line();
178 
179         ipl_flags = IPL_NSS_VALID;
180 }
181 
182 #else /* CONFIG_SHARED_KERNEL */
183 
184 static inline void create_kernel_nss(void) { }
185 
186 #endif /* CONFIG_SHARED_KERNEL */
187 
188 /*
189  * Clear bss memory
190  */
191 static noinline __init void clear_bss_section(void)
192 {
193         memset(__bss_start, 0, __bss_stop - __bss_start);
194 }
195 
196 /*
197  * Initialize storage key for kernel pages
198  */
199 static noinline __init void init_kernel_storage_key(void)
200 {
201 #if PAGE_DEFAULT_KEY
202         unsigned long end_pfn, init_pfn;
203 
204         end_pfn = PFN_UP(__pa(&_end));
205 
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);
209 #endif
210 }
211 
212 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
213 
214 static noinline __init void detect_machine_type(void)
215 {
216         struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
217 
218         /* Check current-configuration-level */
219         if (stsi(NULL, 0, 0, 0) <= 2) {
220                 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
221                 return;
222         }
223         /* Get virtual-machine cpu information. */
224         if (stsi(vmms, 3, 2, 2) || !vmms->count)
225                 return;
226 
227         /* Running under KVM? If not we assume z/VM */
228         if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
229                 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
230         else
231                 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
232 }
233 
234 static __init void setup_topology(void)
235 {
236         int max_mnest;
237 
238         if (!test_facility(11))
239                 return;
240         S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
241         for (max_mnest = 6; max_mnest > 1; max_mnest--) {
242                 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
243                         break;
244         }
245         topology_max_mnest = max_mnest;
246 }
247 
248 static void early_pgm_check_handler(void)
249 {
250         const struct exception_table_entry *fixup;
251         unsigned long cr0, cr0_new;
252         unsigned long addr;
253 
254         addr = S390_lowcore.program_old_psw.addr;
255         fixup = search_exception_tables(addr);
256         if (!fixup)
257                 disabled_wait(0);
258         /* Disable low address protection before storing into lowcore. */
259         __ctl_store(cr0, 0, 0);
260         cr0_new = cr0 & ~(1UL << 28);
261         __ctl_load(cr0_new, 0, 0);
262         S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
263         __ctl_load(cr0, 0, 0);
264 }
265 
266 static noinline __init void setup_lowcore_early(void)
267 {
268         psw_t psw;
269 
270         psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
271         psw.addr = (unsigned long) s390_base_ext_handler;
272         S390_lowcore.external_new_psw = psw;
273         psw.addr = (unsigned long) s390_base_pgm_handler;
274         S390_lowcore.program_new_psw = psw;
275         s390_base_pgm_handler_fn = early_pgm_check_handler;
276 }
277 
278 static noinline __init void setup_facility_list(void)
279 {
280         stfle(S390_lowcore.stfle_fac_list,
281               ARRAY_SIZE(S390_lowcore.stfle_fac_list));
282 }
283 
284 static __init void detect_diag9c(void)
285 {
286         unsigned int cpu_address;
287         int rc;
288 
289         cpu_address = stap();
290         diag_stat_inc(DIAG_STAT_X09C);
291         asm volatile(
292                 "       diag    %2,0,0x9c\n"
293                 "0:     la      %0,0\n"
294                 "1:\n"
295                 EX_TABLE(0b,1b)
296                 : "=d" (rc) : "" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
297         if (!rc)
298                 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
299 }
300 
301 static __init void detect_diag44(void)
302 {
303         int rc;
304 
305         diag_stat_inc(DIAG_STAT_X044);
306         asm volatile(
307                 "       diag    0,0,0x44\n"
308                 "0:     la      %0,0\n"
309                 "1:\n"
310                 EX_TABLE(0b,1b)
311                 : "=d" (rc) : "" (-EOPNOTSUPP) : "cc");
312         if (!rc)
313                 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
314 }
315 
316 static __init void detect_machine_facilities(void)
317 {
318         if (test_facility(8)) {
319                 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
320                 __ctl_set_bit(0, 23);
321         }
322         if (test_facility(78))
323                 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
324         if (test_facility(3))
325                 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
326         if (test_facility(40))
327                 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
328         if (test_facility(50) && test_facility(73))
329                 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
330         if (test_facility(51))
331                 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
332         if (test_facility(129)) {
333                 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
334                 __ctl_set_bit(0, 17);
335         }
336 }
337 
338 static inline void save_vector_registers(void)
339 {
340 #ifdef CONFIG_CRASH_DUMP
341         if (test_facility(129))
342                 save_vx_regs(boot_cpu_vector_save_area);
343 #endif
344 }
345 
346 static int __init disable_vector_extension(char *str)
347 {
348         S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
349         __ctl_clear_bit(0, 17);
350         return 1;
351 }
352 early_param("novx", disable_vector_extension);
353 
354 static int __init cad_setup(char *str)
355 {
356         int val;
357 
358         get_option(&str, &val);
359         if (val && test_facility(128))
360                 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
361         return 0;
362 }
363 early_param("cad", cad_setup);
364 
365 static int __init cad_init(void)
366 {
367         if (MACHINE_HAS_CAD)
368                 /* Enable problem state CAD. */
369                 __ctl_set_bit(2, 3);
370         return 0;
371 }
372 early_initcall(cad_init);
373 
374 static __init void rescue_initrd(void)
375 {
376 #ifdef CONFIG_BLK_DEV_INITRD
377         unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
378         /*
379          * Just like in case of IPL from VM reader we make sure there is a
380          * gap of 4MB between end of kernel and start of initrd.
381          * That way we can also be sure that saving an NSS will succeed,
382          * which however only requires different segments.
383          */
384         if (!INITRD_START || !INITRD_SIZE)
385                 return;
386         if (INITRD_START >= min_initrd_addr)
387                 return;
388         memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
389         INITRD_START = min_initrd_addr;
390 #endif
391 }
392 
393 /* Set up boot command line */
394 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
395 {
396         char *parm, *delim;
397         size_t rc, len;
398 
399         len = strlen(boot_command_line);
400 
401         delim = boot_command_line + len;        /* '\0' character position */
402         parm  = boot_command_line + len + 1;    /* append right after '\0' */
403 
404         rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
405         if (rc) {
406                 if (*parm == '=')
407                         memmove(boot_command_line, parm + 1, rc);
408                 else
409                         *delim = ' ';           /* replace '\0' with space */
410         }
411 }
412 
413 static inline int has_ebcdic_char(const char *str)
414 {
415         int i;
416 
417         for (i = 0; str[i]; i++)
418                 if (str[i] & 0x80)
419                         return 1;
420         return 0;
421 }
422 
423 static void __init setup_boot_command_line(void)
424 {
425         COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
426         /* convert arch command line to ascii if necessary */
427         if (has_ebcdic_char(COMMAND_LINE))
428                 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
429         /* copy arch command line */
430         strlcpy(boot_command_line, strstrip(COMMAND_LINE),
431                 ARCH_COMMAND_LINE_SIZE);
432 
433         /* append IPL PARM data to the boot command line */
434         if (MACHINE_IS_VM)
435                 append_to_cmdline(append_ipl_vmparm);
436 
437         append_to_cmdline(append_ipl_scpdata);
438 }
439 
440 /*
441  * Save ipl parameters, clear bss memory, initialize storage keys
442  * and create a kernel NSS at startup if the SAVESYS= parm is defined
443  */
444 void __init startup_init(void)
445 {
446         reset_tod_clock();
447         ipl_save_parameters();
448         rescue_initrd();
449         clear_bss_section();
450         init_kernel_storage_key();
451         lockdep_off();
452         setup_lowcore_early();
453         setup_facility_list();
454         detect_machine_type();
455         ipl_update_parameters();
456         setup_boot_command_line();
457         create_kernel_nss();
458         detect_diag9c();
459         detect_diag44();
460         detect_machine_facilities();
461         save_vector_registers();
462         setup_topology();
463         sclp_early_detect();
464         lockdep_on();
465 }
466 

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