arch/s390/kernel/setup.c

   1 /*
   2  *  arch/s390/kernel/setup.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "arch/i386/kernel/setup.c"
  10  *    Copyright (C) 1995, Linus Torvalds
  11  */
  12
  13 /*
  14  * This file handles the architecture-dependent parts of initialization
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/module.h>
  19 #include <linux/sched.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/slab.h>
  26 #include <linux/user.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/ioport.h>
  30 #include <linux/delay.h>
  31 #include <linux/config.h>
  32 #include <linux/init.h>
  33 #include <linux/initrd.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/root_dev.h>
  36 #include <linux/console.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/kernel_stat.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42 #include <asm/smp.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/cpcmd.h>
  45 #include <asm/lowcore.h>
  46 #include <asm/irq.h>
  47
  48 /*
  49  * Machine setup..
  50  */
  51 unsigned int console_mode = 0;
  52 unsigned int console_devno = -1;
  53 unsigned int console_irq = -1;
  54 unsigned long memory_size = 0;
  55 unsigned long machine_flags = 0;
  56 unsigned int default_storage_key = 0;
  57 struct {
  58         unsigned long addr, size, type;
  59 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
  60 #define CHUNK_READ_WRITE 0
  61 #define CHUNK_READ_ONLY 1
  62 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  63
  64 /*
  65  * Setup options
  66  */
  67 extern int _text,_etext, _edata, _end;
  68
  69 /*
  70  * This is set up by the setup-routine at boot-time
  71  * for S390 need to find out, what we have to setup
  72  * using address 0x10400 ...
  73  */
  74
  75 #include <asm/setup.h>
  76
  77 static char command_line[COMMAND_LINE_SIZE] = { 0, };
  78
  79 static struct resource code_resource = { "Kernel code", 0x100000, 0 };
  80 static struct resource data_resource = { "Kernel data", 0, 0 };
  81
  82 /*
  83  * cpu_init() initializes state that is per-CPU.
  84  */
  85 void __devinit cpu_init (void)
  86 {
  87         int addr = hard_smp_processor_id();
  88
  89         /*
  90          * Store processor id in lowcore (used e.g. in timer_interrupt)
  91          */
  92         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
  93         S390_lowcore.cpu_data.cpu_addr = addr;
  94
  95         /*
  96          * Force FPU initialization:
  97          */
  98         clear_thread_flag(TIF_USEDFPU);
  99         current->used_math = 0;
 100
 101         /* Setup active_mm for idle_task  */
 102         atomic_inc(&init_mm.mm_count);
 103         current->active_mm = &init_mm;
 104         if (current->mm)
 105                 BUG();
 106         enter_lazy_tlb(&init_mm, current);
 107 }
 108
 109 /*
 110  * VM halt and poweroff setup routines
 111  */
 112 char vmhalt_cmd[128] = "";
 113 char vmpoff_cmd[128] = "";
 114
 115 static inline void strncpy_skip_quote(char *dst, char *src, int n)
 116 {
 117         int sx, dx;
 118
 119         dx = 0;
 120         for (sx = 0; src[sx] != 0; sx++) {
 121                 if (src[sx] == '"') continue;
 122                 dst[dx++] = src[sx];
 123                 if (dx >= n) break;
 124         }
 125 }
 126
 127 static int __init vmhalt_setup(char *str)
 128 {
 129         strncpy_skip_quote(vmhalt_cmd, str, 127);
 130         vmhalt_cmd[127] = 0;
 131         return 1;
 132 }
 133
 134 __setup("vmhalt=", vmhalt_setup);
 135
 136 static int __init vmpoff_setup(char *str)
 137 {
 138         strncpy_skip_quote(vmpoff_cmd, str, 127);
 139         vmpoff_cmd[127] = 0;
 140         return 1;
 141 }
 142
 143 __setup("vmpoff=", vmpoff_setup);
 144
 145 /*
 146  * condev= and conmode= setup parameter.
 147  */
 148
 149 static int __init condev_setup(char *str)
 150 {
 151         int vdev;
 152
 153         vdev = simple_strtoul(str, &str, 0);
 154         if (vdev >= 0 && vdev < 65536) {
 155                 console_devno = vdev;
 156                 console_irq = -1;
 157         }
 158         return 1;
 159 }
 160
 161 __setup("condev=", condev_setup);
 162
 163 static int __init conmode_setup(char *str)
 164 {
 165 #if defined(CONFIG_SCLP_CONSOLE)
 166         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 167                 SET_CONSOLE_SCLP;
 168 #endif
 169 #if defined(CONFIG_TN3215_CONSOLE)
 170         if (strncmp(str, "3215", 5) == 0)
 171                 SET_CONSOLE_3215;
 172 #endif
 173 #if defined(CONFIG_TN3270_CONSOLE)
 174         if (strncmp(str, "3270", 5) == 0)
 175                 SET_CONSOLE_3270;
 176 #endif
 177         return 1;
 178 }
 179
 180 __setup("conmode=", conmode_setup);
 181
 182 static void __init conmode_default(void)
 183 {
 184         char query_buffer[1024];
 185         char *ptr;
 186
 187         if (MACHINE_IS_VM) {
 188                 cpcmd("QUERY CONSOLE", query_buffer, 1024);
 189                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 190                 ptr = strstr(query_buffer, "SUBCHANNEL =");
 191                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
 192                 cpcmd("QUERY TERM", query_buffer, 1024);
 193                 ptr = strstr(query_buffer, "CONMODE");
 194                 /*
 195                  * Set the conmode to 3215 so that the device recognition
 196                  * will set the cu_type of the console to 3215. If the
 197                  * conmode is 3270 and we don't set it back then both
 198                  * 3215 and the 3270 driver will try to access the console
 199                  * device (3215 as console and 3270 as normal tty).
 200                  */
 201                 cpcmd("TERM CONMODE 3215", NULL, 0);
 202                 if (ptr == NULL) {
 203 #if defined(CONFIG_SCLP_CONSOLE)
 204                         SET_CONSOLE_SCLP;
 205 #endif
 206                         return;
 207                 }
 208                 if (strncmp(ptr + 8, "3270", 4) == 0) {
 209 #if defined(CONFIG_TN3270_CONSOLE)
 210                         SET_CONSOLE_3270;
 211 #elif defined(CONFIG_TN3215_CONSOLE)
 212                         SET_CONSOLE_3215;
 213 #elif defined(CONFIG_SCLP_CONSOLE)
 214                         SET_CONSOLE_SCLP;
 215 #endif
 216                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 217 #if defined(CONFIG_TN3215_CONSOLE)
 218                         SET_CONSOLE_3215;
 219 #elif defined(CONFIG_TN3270_CONSOLE)
 220                         SET_CONSOLE_3270;
 221 #elif defined(CONFIG_SCLP_CONSOLE)
 222                         SET_CONSOLE_SCLP;
 223 #endif
 224                 }
 225         } else if (MACHINE_IS_P390) {
 226 #if defined(CONFIG_TN3215_CONSOLE)
 227                 SET_CONSOLE_3215;
 228 #elif defined(CONFIG_TN3270_CONSOLE)
 229                 SET_CONSOLE_3270;
 230 #endif
 231         } else {
 232 #if defined(CONFIG_SCLP_CONSOLE)
 233                 SET_CONSOLE_SCLP;
 234 #endif
 235         }
 236 }
 237
 238 #ifdef CONFIG_SMP
 239 extern void machine_restart_smp(char *);
 240 extern void machine_halt_smp(void);
 241 extern void machine_power_off_smp(void);
 242
 243 void (*_machine_restart)(char *command) = machine_restart_smp;
 244 void (*_machine_halt)(void) = machine_halt_smp;
 245 void (*_machine_power_off)(void) = machine_power_off_smp;
 246 #else
 247 /*
 248  * Reboot, halt and power_off routines for non SMP.
 249  */
 250 extern void reipl(unsigned long devno);
 251 static void do_machine_restart_nonsmp(char * __unused)
 252 {
 253         if (MACHINE_IS_VM)
 254                 cpcmd ("IPL", NULL, 0);
 255         else
 256                 reipl (0x10000 | S390_lowcore.ipl_device);
 257 }
 258
 259 static void do_machine_halt_nonsmp(void)
 260 {
 261         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
 262                 cpcmd(vmhalt_cmd, NULL, 0);
 263         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 264 }
 265
 266 static void do_machine_power_off_nonsmp(void)
 267 {
 268         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
 269                 cpcmd(vmpoff_cmd, NULL, 0);
 270         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 271 }
 272
 273 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
 274 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
 275 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
 276 #endif
 277
 278  /*
 279  * Reboot, halt and power_off stubs. They just call _machine_restart,
 280  * _machine_halt or _machine_power_off.
 281  */
 282
 283 void machine_restart(char *command)
 284 {
 285         console_unblank();
 286         _machine_restart(command);
 287 }
 288
 289 EXPORT_SYMBOL(machine_restart);
 290
 291 void machine_halt(void)
 292 {
 293         console_unblank();
 294         _machine_halt();
 295 }
 296
 297 EXPORT_SYMBOL(machine_halt);
 298
 299 void machine_power_off(void)
 300 {
 301         console_unblank();
 302         _machine_power_off();
 303 }
 304
 305 EXPORT_SYMBOL(machine_power_off);
 306
 307 /*
 308  * Setup function called from init/main.c just after the banner
 309  * was printed.
 310  */
 311 extern char _pstart, _pend, _stext;
 312
 313 void __init setup_arch(char **cmdline_p)
 314 {
 315         unsigned long bootmap_size;
 316         unsigned long memory_start, memory_end;
 317         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
 318         struct resource *res;
 319         unsigned long start_pfn, end_pfn;
 320         static unsigned int smptrap=0;
 321         unsigned long delay = 0;
 322         struct _lowcore *lc;
 323         int i;
 324
 325         if (smptrap)
 326                 return;
 327         smptrap=1;
 328
 329         /*
 330          * print what head.S has found out about the machine
 331          */
 332 #ifndef CONFIG_ARCH_S390X
 333         printk((MACHINE_IS_VM) ?
 334                "We are running under VM (31 bit mode)\n" :
 335                "We are running native (31 bit mode)\n");
 336         printk((MACHINE_HAS_IEEE) ?
 337                "This machine has an IEEE fpu\n" :
 338                "This machine has no IEEE fpu\n");
 339 #else /* CONFIG_ARCH_S390X */
 340         printk((MACHINE_IS_VM) ?
 341                "We are running under VM (64 bit mode)\n" :
 342                "We are running native (64 bit mode)\n");
 343 #endif /* CONFIG_ARCH_S390X */
 344
 345         ROOT_DEV = Root_RAM0;
 346         memory_start = (unsigned long) &_end;    /* fixit if use $CODELO etc*/
 347 #ifndef CONFIG_ARCH_S390X
 348         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
 349         /*
 350          * We need some free virtual space to be able to do vmalloc.
 351          * On a machine with 2GB memory we make sure that we have at
 352          * least 128 MB free space for vmalloc.
 353          */
 354         if (memory_end > 1920*1024*1024)
 355                 memory_end = 1920*1024*1024;
 356 #else /* CONFIG_ARCH_S390X */
 357         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
 358 #endif /* CONFIG_ARCH_S390X */
 359         init_mm.start_code = PAGE_OFFSET;
 360         init_mm.end_code = (unsigned long) &_etext;
 361         init_mm.end_data = (unsigned long) &_edata;
 362         init_mm.brk = (unsigned long) &_end;
 363
 364         code_resource.start = (unsigned long) &_text;
 365         code_resource.end = (unsigned long) &_etext - 1;
 366         data_resource.start = (unsigned long) &_etext;
 367         data_resource.end = (unsigned long) &_edata - 1;
 368
 369         /* Save unparsed command line copy for /proc/cmdline */
 370         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 371         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 372
 373         for (;;) {
 374                 /*
 375                  * "mem=XXX[kKmM]" sets memsize
 376                  */
 377                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
 378                         memory_end = simple_strtoul(from+4, &from, 0);
 379                         if ( *from == 'K' || *from == 'k' ) {
 380                                 memory_end = memory_end << 10;
 381                                 from++;
 382                         } else if ( *from == 'M' || *from == 'm' ) {
 383                                 memory_end = memory_end << 20;
 384                                 from++;
 385                         }
 386                 }
 387                 /*
 388                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
 389                  */
 390                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
 391                         delay = simple_strtoul(from+9, &from, 0);
 392                         if (*from == 's' || *from == 'S') {
 393                                 delay = delay*1000000;
 394                                 from++;
 395                         } else if (*from == 'm' || *from == 'M') {
 396                                 delay = delay*60*1000000;
 397                                 from++;
 398                         }
 399                         /* now wait for the requested amount of time */
 400                         udelay(delay);
 401                 }
 402                 cn = *(from++);
 403                 if (!cn)
 404                         break;
 405                 if (cn == '\n')
 406                         cn = ' ';  /* replace newlines with space */
 407                 if (cn == 0x0d)
 408                         cn = ' ';  /* replace 0x0d with space */
 409                 if (cn == ' ' && c == ' ')
 410                         continue;  /* remove additional spaces */
 411                 c = cn;
 412                 if (to - command_line >= COMMAND_LINE_SIZE)
 413                         break;
 414                 *(to++) = c;
 415         }
 416         if (c == ' ' && to > command_line) to--;
 417         *to = '\0';
 418         *cmdline_p = command_line;
 419
 420         /*
 421          * partially used pages are not usable - thus
 422          * we are rounding upwards:
 423          */
 424         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
 425         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
 426
 427         /*
 428          * Initialize the boot-time allocator (with low memory only):
 429          */
 430         bootmap_size = init_bootmem(start_pfn, end_pfn);
 431
 432         /*
 433          * Register RAM areas with the bootmem allocator.
 434          */
 435         for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
 436                 unsigned long start_chunk, end_chunk;
 437
 438                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
 439                         continue;
 440                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
 441                 start_chunk >>= PAGE_SHIFT;
 442                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
 443                 end_chunk >>= PAGE_SHIFT;
 444                 if (start_chunk < start_pfn)
 445                         start_chunk = start_pfn;
 446                 if (end_chunk > end_pfn)
 447                         end_chunk = end_pfn;
 448                 if (start_chunk < end_chunk)
 449                         free_bootmem(start_chunk << PAGE_SHIFT,
 450                                      (end_chunk - start_chunk) << PAGE_SHIFT);
 451         }
 452
 453         /*
 454          * Reserve the bootmem bitmap itself as well. We do this in two
 455          * steps (first step was init_bootmem()) because this catches
 456          * the (very unlikely) case of us accidentally initializing the
 457          * bootmem allocator with an invalid RAM area.
 458          */
 459         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
 460
 461 #ifdef CONFIG_BLK_DEV_INITRD
 462         if (INITRD_START) {
 463                 if (INITRD_START + INITRD_SIZE <= memory_end) {
 464                         reserve_bootmem(INITRD_START, INITRD_SIZE);
 465                         initrd_start = INITRD_START;
 466                         initrd_end = initrd_start + INITRD_SIZE;
 467                 } else {
 468                         printk("initrd extends beyond end of memory "
 469                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 470                                initrd_start + INITRD_SIZE, memory_end);
 471                         initrd_start = initrd_end = 0;
 472                 }
 473         }
 474 #endif
 475
 476         /*
 477          * Setup lowcore for boot cpu
 478          */
 479 #ifndef CONFIG_ARCH_S390X
 480         lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 481         memset(lc, 0, PAGE_SIZE);
 482 #else /* CONFIG_ARCH_S390X */
 483         lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
 484         memset(lc, 0, 2*PAGE_SIZE);
 485 #endif /* CONFIG_ARCH_S390X */
 486         lc->restart_psw.mask = PSW_BASE_BITS;
 487         lc->restart_psw.addr =
 488                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 489         lc->external_new_psw.mask = PSW_KERNEL_BITS;
 490         lc->external_new_psw.addr =
 491                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 492         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
 493         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 494         lc->program_new_psw.mask = PSW_KERNEL_BITS;
 495         lc->program_new_psw.addr =
 496                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 497         lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
 498         lc->mcck_new_psw.addr =
 499                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 500         lc->io_new_psw.mask = PSW_KERNEL_BITS;
 501         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 502         lc->ipl_device = S390_lowcore.ipl_device;
 503         lc->jiffy_timer = -1LL;
 504         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 505         lc->async_stack = (unsigned long)
 506                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 507 #ifdef CONFIG_CHECK_STACK
 508         lc->panic_stack = (unsigned long)
 509                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 510 #endif
 511         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 512         lc->thread_info = (unsigned long) &init_thread_union;
 513 #ifdef CONFIG_ARCH_S390X
 514         if (MACHINE_HAS_DIAG44)
 515                 lc->diag44_opcode = 0x83000044;
 516         else
 517                 lc->diag44_opcode = 0x07000700;
 518 #endif /* CONFIG_ARCH_S390X */
 519         set_prefix((u32)(unsigned long) lc);
 520         cpu_init();
 521         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 522
 523         /*
 524          * Create kernel page tables and switch to virtual addressing.
 525          */
 526         paging_init();
 527
 528         res = alloc_bootmem_low(sizeof(struct resource));
 529         res->start = 0;
 530         res->end = memory_end;
 531         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 532         request_resource(&iomem_resource, res);
 533         request_resource(res, &code_resource);
 534         request_resource(res, &data_resource);
 535
 536         /* Setup default console */
 537         conmode_default();
 538 }
 539
 540 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 541 {
 542    printk("cpu %d "
 543 #ifdef CONFIG_SMP
 544            "phys_idx=%d "
 545 #endif
 546            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 547            cpuinfo->cpu_nr,
 548 #ifdef CONFIG_SMP
 549            cpuinfo->cpu_addr,
 550 #endif
 551            cpuinfo->cpu_id.version,
 552            cpuinfo->cpu_id.ident,
 553            cpuinfo->cpu_id.machine,
 554            cpuinfo->cpu_id.unused);
 555 }
 556
 557 /*
 558  * show_cpuinfo - Get information on one CPU for use by procfs.
 559  */
 560
 561 static int show_cpuinfo(struct seq_file *m, void *v)
 562 {
 563         struct cpuinfo_S390 *cpuinfo;
 564         unsigned long n = (unsigned long) v - 1;
 565
 566         if (!n) {
 567                 seq_printf(m, "vendor_id       : IBM/S390\n"
 568                                "# processors    : %i\n"
 569                                "bogomips per cpu: %lu.%02lu\n",
 570                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
 571                                (loops_per_jiffy/(5000/HZ))%100);
 572         }
 573         if (cpu_online(n)) {
 574 #ifdef CONFIG_SMP
 575                 if (smp_processor_id() == n)
 576                         cpuinfo = &S390_lowcore.cpu_data;
 577                 else
 578                         cpuinfo = &lowcore_ptr[n]->cpu_data;
 579 #else
 580                 cpuinfo = &S390_lowcore.cpu_data;
 581 #endif
 582                 seq_printf(m, "processor %li: "
 583                                "version = %02X,  "
 584                                "identification = %06X,  "
 585                                "machine = %04X\n",
 586                                n, cpuinfo->cpu_id.version,
 587                                cpuinfo->cpu_id.ident,
 588                                cpuinfo->cpu_id.machine);
 589         }
 590         return 0;
 591 }
 592
 593 static void *c_start(struct seq_file *m, loff_t *pos)
 594 {
 595         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 596 }
 597 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 598 {
 599         ++*pos;
 600         return c_start(m, pos);
 601 }
 602 static void c_stop(struct seq_file *m, void *v)
 603 {
 604 }
 605 struct seq_operations cpuinfo_op = {
 606         .start  = c_start,
 607         .next   = c_next,
 608         .stop   = c_stop,
 609         .show   = show_cpuinfo,
 610 };
 611