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