arch/s390/include/asm/processor.h

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  *  Derived from "include/asm-i386/processor.h"
   8  *    Copyright (C) 1994, Linus Torvalds
   9  */
  10
  11 #ifndef __ASM_S390_PROCESSOR_H
  12 #define __ASM_S390_PROCESSOR_H
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #include <linux/linkage.h>
  17 #include <linux/irqflags.h>
  18 #include <asm/cpu.h>
  19 #include <asm/page.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/setup.h>
  22 #include <asm/runtime_instr.h>
  23
  24 /*
  25  * Default implementation of macro that returns current
  26  * instruction pointer ("program counter").
  27  */
  28 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
  29
  30 static inline void get_cpu_id(struct cpuid *ptr)
  31 {
  32         asm volatile("stidp %0" : "=Q" (*ptr));
  33 }
  34
  35 extern void s390_adjust_jiffies(void);
  36 extern const struct seq_operations cpuinfo_op;
  37 extern int sysctl_ieee_emulation_warnings;
  38 extern void execve_tail(void);
  39
  40 /*
  41  * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  42  */
  43 #ifndef CONFIG_64BIT
  44
  45 #define TASK_SIZE               (1UL << 31)
  46 #define TASK_MAX_SIZE           (1UL << 31)
  47 #define TASK_UNMAPPED_BASE      (1UL << 30)
  48
  49 #else /* CONFIG_64BIT */
  50
  51 #define TASK_SIZE_OF(tsk)       ((tsk)->mm->context.asce_limit)
  52 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  53                                         (1UL << 30) : (1UL << 41))
  54 #define TASK_SIZE               TASK_SIZE_OF(current)
  55 #define TASK_MAX_SIZE           (1UL << 53)
  56
  57 #endif /* CONFIG_64BIT */
  58
  59 #ifndef CONFIG_64BIT
  60 #define STACK_TOP               (1UL << 31)
  61 #define STACK_TOP_MAX           (1UL << 31)
  62 #else /* CONFIG_64BIT */
  63 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
  64 #define STACK_TOP_MAX           (1UL << 42)
  65 #endif /* CONFIG_64BIT */
  66
  67 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  68
  69 typedef struct {
  70         __u32 ar4;
  71 } mm_segment_t;
  72
  73 /*
  74  * Thread structure
  75  */
  76 struct thread_struct {
  77         s390_fp_regs fp_regs;
  78         unsigned int  acrs[NUM_ACRS];
  79         unsigned long ksp;              /* kernel stack pointer             */
  80         mm_segment_t mm_segment;
  81         unsigned long gmap_addr;        /* address of last gmap fault. */
  82         struct per_regs per_user;       /* User specified PER registers */
  83         struct per_event per_event;     /* Cause of the last PER trap */
  84         unsigned long per_flags;        /* Flags to control debug behavior */
  85         /* pfault_wait is used to block the process on a pfault event */
  86         unsigned long pfault_wait;
  87         struct list_head list;
  88         /* cpu runtime instrumentation */
  89         struct runtime_instr_cb *ri_cb;
  90         int ri_signum;
  91 #ifdef CONFIG_64BIT
  92         unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
  93 #endif
  94 };
  95
  96 /* Flag to disable transactions. */
  97 #define PER_FLAG_NO_TE                  1UL
  98 /* Flag to enable random transaction aborts. */
  99 #define PER_FLAG_TE_ABORT_RAND          2UL
 100 /* Flag to specify random transaction abort mode:
 101  * - abort each transaction at a random instruction before TEND if set.
 102  * - abort random transactions at a random instruction if cleared.
 103  */
 104 #define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 105
 106 typedef struct thread_struct thread_struct;
 107
 108 /*
 109  * Stack layout of a C stack frame.
 110  */
 111 #ifndef __PACK_STACK
 112 struct stack_frame {
 113         unsigned long back_chain;
 114         unsigned long empty1[5];
 115         unsigned long gprs[10];
 116         unsigned int  empty2[8];
 117 };
 118 #else
 119 struct stack_frame {
 120         unsigned long empty1[5];
 121         unsigned int  empty2[8];
 122         unsigned long gprs[10];
 123         unsigned long back_chain;
 124 };
 125 #endif
 126
 127 #define ARCH_MIN_TASKALIGN      8
 128
 129 #define INIT_THREAD {                                                   \
 130         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 131 }
 132
 133 /*
 134  * Do necessary setup to start up a new thread.
 135  */
 136 #define start_thread(regs, new_psw, new_stackp) do {                    \
 137         regs->psw.mask  = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA;    \
 138         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;                     \
 139         regs->gprs[15]  = new_stackp;                                   \
 140         execve_tail();                                                  \
 141 } while (0)
 142
 143 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 144         regs->psw.mask  = psw_user_bits | PSW_MASK_BA;                  \
 145         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;                     \
 146         regs->gprs[15]  = new_stackp;                                   \
 147         __tlb_flush_mm(current->mm);                                    \
 148         crst_table_downgrade(current->mm, 1UL << 31);                   \
 149         update_mm(current->mm, current);                                \
 150         execve_tail();                                                  \
 151 } while (0)
 152
 153 /* Forward declaration, a strange C thing */
 154 struct task_struct;
 155 struct mm_struct;
 156 struct seq_file;
 157
 158 #ifdef CONFIG_64BIT
 159 extern void show_cacheinfo(struct seq_file *m);
 160 #else
 161 static inline void show_cacheinfo(struct seq_file *m) { }
 162 #endif
 163
 164 /* Free all resources held by a thread. */
 165 extern void release_thread(struct task_struct *);
 166
 167 /*
 168  * Return saved PC of a blocked thread.
 169  */
 170 extern unsigned long thread_saved_pc(struct task_struct *t);
 171
 172 extern void show_code(struct pt_regs *regs);
 173 extern void print_fn_code(unsigned char *code, unsigned long len);
 174 extern int insn_to_mnemonic(unsigned char *instruction, char *buf,
 175                             unsigned int len);
 176
 177 unsigned long get_wchan(struct task_struct *p);
 178 #define task_pt_regs(tsk) ((struct pt_regs *) \
 179         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 180 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 181 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 182
 183 static inline unsigned short stap(void)
 184 {
 185         unsigned short cpu_address;
 186
 187         asm volatile("stap %0" : "=m" (cpu_address));
 188         return cpu_address;
 189 }
 190
 191 /*
 192  * Give up the time slice of the virtual PU.
 193  */
 194 static inline void cpu_relax(void)
 195 {
 196         if (MACHINE_HAS_DIAG44)
 197                 asm volatile("diag 0,0,68");
 198         barrier();
 199 }
 200
 201 static inline void psw_set_key(unsigned int key)
 202 {
 203         asm volatile("spka 0(%0)" : : "d" (key));
 204 }
 205
 206 /*
 207  * Set PSW to specified value.
 208  */
 209 static inline void __load_psw(psw_t psw)
 210 {
 211 #ifndef CONFIG_64BIT
 212         asm volatile("lpsw  %0" : : "Q" (psw) : "cc");
 213 #else
 214         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 215 #endif
 216 }
 217
 218 /*
 219  * Set PSW mask to specified value, while leaving the
 220  * PSW addr pointing to the next instruction.
 221  */
 222 static inline void __load_psw_mask (unsigned long mask)
 223 {
 224         unsigned long addr;
 225         psw_t psw;
 226
 227         psw.mask = mask;
 228
 229 #ifndef CONFIG_64BIT
 230         asm volatile(
 231                 "       basr    %0,0\n"
 232                 "0:     ahi     %0,1f-0b\n"
 233                 "       st      %0,%O1+4(%R1)\n"
 234                 "       lpsw    %1\n"
 235                 "1:"
 236                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 237 #else /* CONFIG_64BIT */
 238         asm volatile(
 239                 "       larl    %0,1f\n"
 240                 "       stg     %0,%O1+8(%R1)\n"
 241                 "       lpswe   %1\n"
 242                 "1:"
 243                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 244 #endif /* CONFIG_64BIT */
 245 }
 246
 247 /*
 248  * Rewind PSW instruction address by specified number of bytes.
 249  */
 250 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 251 {
 252 #ifndef CONFIG_64BIT
 253         if (psw.addr & PSW_ADDR_AMODE)
 254                 /* 31 bit mode */
 255                 return (psw.addr - ilc) | PSW_ADDR_AMODE;
 256         /* 24 bit mode */
 257         return (psw.addr - ilc) & ((1UL << 24) - 1);
 258 #else
 259         unsigned long mask;
 260
 261         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 262                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 263                                           (1UL << 24) - 1;
 264         return (psw.addr - ilc) & mask;
 265 #endif
 266 }
 267
 268 /*
 269  * Function to drop a processor into disabled wait state
 270  */
 271 static inline void __noreturn disabled_wait(unsigned long code)
 272 {
 273         unsigned long ctl_buf;
 274         psw_t dw_psw;
 275
 276         dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 277         dw_psw.addr = code;
 278         /*
 279          * Store status and then load disabled wait psw,
 280          * the processor is dead afterwards
 281          */
 282 #ifndef CONFIG_64BIT
 283         asm volatile(
 284                 "       stctl   0,0,0(%2)\n"
 285                 "       ni      0(%2),0xef\n"   /* switch off protection */
 286                 "       lctl    0,0,0(%2)\n"
 287                 "       stpt    0xd8\n"         /* store timer */
 288                 "       stckc   0xe0\n"         /* store clock comparator */
 289                 "       stpx    0x108\n"        /* store prefix register */
 290                 "       stam    0,15,0x120\n"   /* store access registers */
 291                 "       std     0,0x160\n"      /* store f0 */
 292                 "       std     2,0x168\n"      /* store f2 */
 293                 "       std     4,0x170\n"      /* store f4 */
 294                 "       std     6,0x178\n"      /* store f6 */
 295                 "       stm     0,15,0x180\n"   /* store general registers */
 296                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 297                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 298                 "       lpsw    0(%1)"
 299                 : "=m" (ctl_buf)
 300                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 301 #else /* CONFIG_64BIT */
 302         asm volatile(
 303                 "       stctg   0,0,0(%2)\n"
 304                 "       ni      4(%2),0xef\n"   /* switch off protection */
 305                 "       lctlg   0,0,0(%2)\n"
 306                 "       lghi    1,0x1000\n"
 307                 "       stpt    0x328(1)\n"     /* store timer */
 308                 "       stckc   0x330(1)\n"     /* store clock comparator */
 309                 "       stpx    0x318(1)\n"     /* store prefix register */
 310                 "       stam    0,15,0x340(1)\n"/* store access registers */
 311                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 312                 "       std     0,0x200(1)\n"   /* store f0 */
 313                 "       std     1,0x208(1)\n"   /* store f1 */
 314                 "       std     2,0x210(1)\n"   /* store f2 */
 315                 "       std     3,0x218(1)\n"   /* store f3 */
 316                 "       std     4,0x220(1)\n"   /* store f4 */
 317                 "       std     5,0x228(1)\n"   /* store f5 */
 318                 "       std     6,0x230(1)\n"   /* store f6 */
 319                 "       std     7,0x238(1)\n"   /* store f7 */
 320                 "       std     8,0x240(1)\n"   /* store f8 */
 321                 "       std     9,0x248(1)\n"   /* store f9 */
 322                 "       std     10,0x250(1)\n"  /* store f10 */
 323                 "       std     11,0x258(1)\n"  /* store f11 */
 324                 "       std     12,0x260(1)\n"  /* store f12 */
 325                 "       std     13,0x268(1)\n"  /* store f13 */
 326                 "       std     14,0x270(1)\n"  /* store f14 */
 327                 "       std     15,0x278(1)\n"  /* store f15 */
 328                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 329                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 330                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 331                 "       lpswe   0(%1)"
 332                 : "=m" (ctl_buf)
 333                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
 334 #endif /* CONFIG_64BIT */
 335         while (1);
 336 }
 337
 338 /*
 339  * Use to set psw mask except for the first byte which
 340  * won't be changed by this function.
 341  */
 342 static inline void
 343 __set_psw_mask(unsigned long mask)
 344 {
 345         __load_psw_mask(mask | (arch_local_save_flags() & ~(-1UL >> 8)));
 346 }
 347
 348 #define local_mcck_enable() \
 349         __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
 350 #define local_mcck_disable() \
 351         __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)
 352
 353 /*
 354  * Basic Machine Check/Program Check Handler.
 355  */
 356
 357 extern void s390_base_mcck_handler(void);
 358 extern void s390_base_pgm_handler(void);
 359 extern void s390_base_ext_handler(void);
 360
 361 extern void (*s390_base_mcck_handler_fn)(void);
 362 extern void (*s390_base_pgm_handler_fn)(void);
 363 extern void (*s390_base_ext_handler_fn)(void);
 364
 365 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 366
 367 extern int memcpy_real(void *, void *, size_t);
 368 extern void memcpy_absolute(void *, void *, size_t);
 369
 370 #define mem_assign_absolute(dest, val) {                        \
 371         __typeof__(dest) __tmp = (val);                         \
 372                                                                 \
 373         BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 374         memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 375 }
 376
 377 /*
 378  * Helper macro for exception table entries
 379  */
 380 #define EX_TABLE(_fault, _target)       \
 381         ".section __ex_table,\"a\"\n"   \
 382         ".align 4\n"                    \
 383         ".long  (" #_fault ") - .\n"    \
 384         ".long  (" #_target ") - .\n"   \
 385         ".previous\n"
 386
 387 #else /* __ASSEMBLY__ */
 388
 389 #define EX_TABLE(_fault, _target)       \
 390         .section __ex_table,"a" ;       \
 391         .align  4 ;                     \
 392         .long   (_fault) - . ;          \
 393         .long   (_target) - . ;         \
 394         .previous
 395
 396 #endif /* __ASSEMBLY__ */
 397
 398 #endif /* __ASM_S390_PROCESSOR_H */