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   1 /*
   2  *  arch/s390/kernel/early.c
   3  *
   4  *    Copyright IBM Corp. 2007
   5  *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
   6  *               Heiko Carstens <heiko.carstens@de.ibm.com>
   7  */
   8
   9 #include <linux/compiler.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/string.h>
  13 #include <linux/ctype.h>
  14 #include <linux/lockdep.h>
  15 #include <linux/module.h>
  16 #include <linux/pfn.h>
  17 #include <linux/uaccess.h>
  18 #include <asm/ebcdic.h>
  19 #include <asm/ipl.h>
  20 #include <asm/lowcore.h>
  21 #include <asm/processor.h>
  22 #include <asm/sections.h>
  23 #include <asm/setup.h>
  24 #include <asm/sysinfo.h>
  25 #include <asm/cpcmd.h>
  26 #include <asm/sclp.h>
  27 #include "entry.h"
  28
  29 /*
  30  * Create a Kernel NSS if the SAVESYS= parameter is defined
  31  */
  32 #define DEFSYS_CMD_SIZE         128
  33 #define SAVESYS_CMD_SIZE        32
  34
  35 char kernel_nss_name[NSS_NAME_SIZE + 1];
  36
  37 static unsigned long machine_flags;
  38
  39 static void __init setup_boot_command_line(void);
  40
  41
  42 #ifdef CONFIG_SHARED_KERNEL
  43 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
  44
  45 asm(
  46         "       .section .init.text,\"ax\",@progbits\n"
  47         "       .align  4\n"
  48         "       .type   savesys_ipl_nss, @function\n"
  49         "savesys_ipl_nss:\n"
  50 #ifdef CONFIG_64BIT
  51         "       stmg    6,15,48(15)\n"
  52         "       lgr     14,3\n"
  53         "       sam31\n"
  54         "       diag    2,14,0x8\n"
  55         "       sam64\n"
  56         "       lgr     2,14\n"
  57         "       lmg     6,15,48(15)\n"
  58 #else
  59         "       stm     6,15,24(15)\n"
  60         "       lr      14,3\n"
  61         "       diag    2,14,0x8\n"
  62         "       lr      2,14\n"
  63         "       lm      6,15,24(15)\n"
  64 #endif
  65         "       br      14\n"
  66         "       .size   savesys_ipl_nss, .-savesys_ipl_nss\n");
  67
  68 static noinline __init void create_kernel_nss(void)
  69 {
  70         unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
  71 #ifdef CONFIG_BLK_DEV_INITRD
  72         unsigned int sinitrd_pfn, einitrd_pfn;
  73 #endif
  74         int response;
  75         size_t len;
  76         char *savesys_ptr;
  77         char upper_command_line[COMMAND_LINE_SIZE];
  78         char defsys_cmd[DEFSYS_CMD_SIZE];
  79         char savesys_cmd[SAVESYS_CMD_SIZE];
  80
  81         /* Do nothing if we are not running under VM */
  82         if (!MACHINE_IS_VM)
  83                 return;
  84
  85         /* Convert COMMAND_LINE to upper case */
  86         for (i = 0; i < strlen(boot_command_line); i++)
  87                 upper_command_line[i] = toupper(boot_command_line[i]);
  88
  89         savesys_ptr = strstr(upper_command_line, "SAVESYS=");
  90
  91         if (!savesys_ptr)
  92                 return;
  93
  94         savesys_ptr += 8;    /* Point to the beginning of the NSS name */
  95         for (i = 0; i < NSS_NAME_SIZE; i++) {
  96                 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
  97                         break;
  98                 kernel_nss_name[i] = savesys_ptr[i];
  99         }
 100
 101         stext_pfn = PFN_DOWN(__pa(&_stext));
 102         eshared_pfn = PFN_DOWN(__pa(&_eshared));
 103         end_pfn = PFN_UP(__pa(&_end));
 104         min_size = end_pfn << 2;
 105
 106         sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
 107                 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
 108                 eshared_pfn, end_pfn);
 109
 110 #ifdef CONFIG_BLK_DEV_INITRD
 111         if (INITRD_START && INITRD_SIZE) {
 112                 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
 113                 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
 114                 min_size = einitrd_pfn << 2;
 115                 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
 116                 sinitrd_pfn, einitrd_pfn);
 117         }
 118 #endif
 119
 120         sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
 121                 defsys_cmd, min_size);
 122         sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
 123                 kernel_nss_name, kernel_nss_name);
 124
 125         __cpcmd(defsys_cmd, NULL, 0, &response);
 126
 127         if (response != 0) {
 128                 kernel_nss_name[0] = '\0';
 129                 return;
 130         }
 131
 132         len = strlen(savesys_cmd);
 133         ASCEBC(savesys_cmd, len);
 134         response = savesys_ipl_nss(savesys_cmd, len);
 135
 136         /* On success: response is equal to the command size,
 137          *             max SAVESYS_CMD_SIZE
 138          * On error: response contains the numeric portion of cp error message.
 139          *           for SAVESYS it will be >= 263
 140          */
 141         if (response > SAVESYS_CMD_SIZE) {
 142                 kernel_nss_name[0] = '\0';
 143                 return;
 144         }
 145
 146         /* re-setup boot command line with new ipl vm parms */
 147         ipl_update_parameters();
 148         setup_boot_command_line();
 149
 150         ipl_flags = IPL_NSS_VALID;
 151 }
 152
 153 #else /* CONFIG_SHARED_KERNEL */
 154
 155 static inline void create_kernel_nss(void) { }
 156
 157 #endif /* CONFIG_SHARED_KERNEL */
 158
 159 /*
 160  * Clear bss memory
 161  */
 162 static noinline __init void clear_bss_section(void)
 163 {
 164         memset(__bss_start, 0, __bss_stop - __bss_start);
 165 }
 166
 167 /*
 168  * Initialize storage key for kernel pages
 169  */
 170 static noinline __init void init_kernel_storage_key(void)
 171 {
 172         unsigned long end_pfn, init_pfn;
 173
 174         end_pfn = PFN_UP(__pa(&_end));
 175
 176         for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
 177                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
 178 }
 179
 180 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
 181
 182 static noinline __init void detect_machine_type(void)
 183 {
 184         /* No VM information? Looks like LPAR */
 185         if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
 186                 return;
 187         if (!vmms.count)
 188                 return;
 189
 190         /* Running under KVM? If not we assume z/VM */
 191         if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
 192                 machine_flags |= MACHINE_FLAG_KVM;
 193         else
 194                 machine_flags |= MACHINE_FLAG_VM;
 195 }
 196
 197 static __init void early_pgm_check_handler(void)
 198 {
 199         unsigned long addr;
 200         const struct exception_table_entry *fixup;
 201
 202         addr = S390_lowcore.program_old_psw.addr;
 203         fixup = search_exception_tables(addr & PSW_ADDR_INSN);
 204         if (!fixup)
 205                 disabled_wait(0);
 206         S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
 207 }
 208
 209 static noinline __init void setup_lowcore_early(void)
 210 {
 211         psw_t psw;
 212
 213         psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 214         psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
 215         S390_lowcore.external_new_psw = psw;
 216         psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
 217         S390_lowcore.program_new_psw = psw;
 218         s390_base_pgm_handler_fn = early_pgm_check_handler;
 219 }
 220
 221 static noinline __init void setup_hpage(void)
 222 {
 223 #ifndef CONFIG_DEBUG_PAGEALLOC
 224         unsigned int facilities;
 225
 226         facilities = stfl();
 227         if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
 228                 return;
 229         machine_flags |= MACHINE_FLAG_HPAGE;
 230         __ctl_set_bit(0, 23);
 231 #endif
 232 }
 233
 234 static __init void detect_mvpg(void)
 235 {
 236 #ifndef CONFIG_64BIT
 237         int rc;
 238
 239         asm volatile(
 240                 "       la      0,0\n"
 241                 "       mvpg    %2,%2\n"
 242                 "0:     la      %0,0\n"
 243                 "1:\n"
 244                 EX_TABLE(0b,1b)
 245                 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
 246         if (!rc)
 247                 machine_flags |= MACHINE_FLAG_MVPG;
 248 #endif
 249 }
 250
 251 static __init void detect_ieee(void)
 252 {
 253 #ifndef CONFIG_64BIT
 254         int rc, tmp;
 255
 256         asm volatile(
 257                 "       efpc    %1,0\n"
 258                 "0:     la      %0,0\n"
 259                 "1:\n"
 260                 EX_TABLE(0b,1b)
 261                 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
 262         if (!rc)
 263                 machine_flags |= MACHINE_FLAG_IEEE;
 264 #endif
 265 }
 266
 267 static __init void detect_csp(void)
 268 {
 269 #ifndef CONFIG_64BIT
 270         int rc;
 271
 272         asm volatile(
 273                 "       la      0,0\n"
 274                 "       la      1,0\n"
 275                 "       la      2,4\n"
 276                 "       csp     0,2\n"
 277                 "0:     la      %0,0\n"
 278                 "1:\n"
 279                 EX_TABLE(0b,1b)
 280                 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
 281         if (!rc)
 282                 machine_flags |= MACHINE_FLAG_CSP;
 283 #endif
 284 }
 285
 286 static __init void detect_diag9c(void)
 287 {
 288         unsigned int cpu_address;
 289         int rc;
 290
 291         cpu_address = stap();
 292         asm volatile(
 293                 "       diag    %2,0,0x9c\n"
 294                 "0:     la      %0,0\n"
 295                 "1:\n"
 296                 EX_TABLE(0b,1b)
 297                 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
 298         if (!rc)
 299                 machine_flags |= MACHINE_FLAG_DIAG9C;
 300 }
 301
 302 static __init void detect_diag44(void)
 303 {
 304 #ifdef CONFIG_64BIT
 305         int rc;
 306
 307         asm volatile(
 308                 "       diag    0,0,0x44\n"
 309                 "0:     la      %0,0\n"
 310                 "1:\n"
 311                 EX_TABLE(0b,1b)
 312                 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
 313         if (!rc)
 314                 machine_flags |= MACHINE_FLAG_DIAG44;
 315 #endif
 316 }
 317
 318 static __init void detect_machine_facilities(void)
 319 {
 320 #ifdef CONFIG_64BIT
 321         unsigned int facilities;
 322
 323         facilities = stfl();
 324         if (facilities & (1 << 28))
 325                 machine_flags |= MACHINE_FLAG_IDTE;
 326         if (facilities & (1 << 23))
 327                 machine_flags |= MACHINE_FLAG_PFMF;
 328         if (facilities & (1 << 4))
 329                 machine_flags |= MACHINE_FLAG_MVCOS;
 330 #endif
 331 }
 332
 333 static __init void rescue_initrd(void)
 334 {
 335 #ifdef CONFIG_BLK_DEV_INITRD
 336         /*
 337          * Move the initrd right behind the bss section in case it starts
 338          * within the bss section. So we don't overwrite it when the bss
 339          * section gets cleared.
 340          */
 341         if (!INITRD_START || !INITRD_SIZE)
 342                 return;
 343         if (INITRD_START >= (unsigned long) __bss_stop)
 344                 return;
 345         memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
 346         INITRD_START = (unsigned long) __bss_stop;
 347 #endif
 348 }
 349
 350 /* Set up boot command line */
 351 static void __init setup_boot_command_line(void)
 352 {
 353         char *parm = NULL;
 354
 355         /* copy arch command line */
 356         strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
 357
 358         /* append IPL PARM data to the boot command line */
 359         if (MACHINE_IS_VM) {
 360                 parm = boot_command_line + strlen(boot_command_line);
 361                 *parm++ = ' ';
 362                 get_ipl_vmparm(parm);
 363                 if (parm[0] == '=')
 364                         memmove(boot_command_line, parm + 1, strlen(parm));
 365         }
 366 }
 367
 368
 369 /*
 370  * Save ipl parameters, clear bss memory, initialize storage keys
 371  * and create a kernel NSS at startup if the SAVESYS= parm is defined
 372  */
 373 void __init startup_init(void)
 374 {
 375         ipl_save_parameters();
 376         rescue_initrd();
 377         clear_bss_section();
 378         init_kernel_storage_key();
 379         lockdep_init();
 380         lockdep_off();
 381         sort_main_extable();
 382         setup_lowcore_early();
 383         detect_machine_type();
 384         ipl_update_parameters();
 385         setup_boot_command_line();
 386         create_kernel_nss();
 387         detect_mvpg();
 388         detect_ieee();
 389         detect_csp();
 390         detect_diag9c();
 391         detect_diag44();
 392         detect_machine_facilities();
 393         setup_hpage();
 394         sclp_facilities_detect();
 395         detect_memory_layout(memory_chunk);
 396         S390_lowcore.machine_flags = machine_flags;
 397         lockdep_on();
 398 }