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