include/asm-s390/processor.h

   1 /*
   2  *  include/asm-s390/processor.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 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 "include/asm-i386/processor.h"
  10  *    Copyright (C) 1994, Linus Torvalds
  11  */
  12
  13 #ifndef __ASM_S390_PROCESSOR_H
  14 #define __ASM_S390_PROCESSOR_H
  15
  16 #include <asm/ptrace.h>
  17
  18 #ifdef __KERNEL__
  19 /*
  20  * Default implementation of macro that returns current
  21  * instruction pointer ("program counter").
  22  */
  23 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
  24
  25 /*
  26  *  CPU type and hardware bug flags. Kept separately for each CPU.
  27  *  Members of this structure are referenced in head.S, so think twice
  28  *  before touching them. [mj]
  29  */
  30
  31 typedef struct
  32 {
  33         unsigned int version :  8;
  34         unsigned int ident   : 24;
  35         unsigned int machine : 16;
  36         unsigned int unused  : 16;
  37 } __attribute__ ((packed)) cpuid_t;
  38
  39 static inline void get_cpu_id(cpuid_t *ptr)
  40 {
  41         asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
  42 }
  43
  44 struct cpuinfo_S390
  45 {
  46         cpuid_t  cpu_id;
  47         __u16    cpu_addr;
  48         __u16    cpu_nr;
  49         unsigned long loops_per_jiffy;
  50         unsigned long *pgd_quick;
  51 #ifdef __s390x__
  52         unsigned long *pmd_quick;
  53 #endif /* __s390x__ */
  54         unsigned long *pte_quick;
  55         unsigned long pgtable_cache_sz;
  56 };
  57
  58 extern void s390_adjust_jiffies(void);
  59 extern void print_cpu_info(struct cpuinfo_S390 *);
  60 extern int get_cpu_capability(unsigned int *);
  61
  62 /* Lazy FPU handling on uni-processor */
  63 extern struct task_struct *last_task_used_math;
  64
  65 /*
  66  * User space process size: 2GB for 31 bit, 4TB for 64 bit.
  67  */
  68 #ifndef __s390x__
  69
  70 # define TASK_SIZE              (0x80000000UL)
  71 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  72 # define DEFAULT_TASK_SIZE      (0x80000000UL)
  73
  74 #else /* __s390x__ */
  75
  76 # define TASK_SIZE              (test_thread_flag(TIF_31BIT) ? \
  77                                         (0x80000000UL) : (0x40000000000UL))
  78 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  79 # define DEFAULT_TASK_SIZE      (0x40000000000UL)
  80
  81 #endif /* __s390x__ */
  82
  83 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  84
  85 typedef struct {
  86         __u32 ar4;
  87 } mm_segment_t;
  88
  89 /*
  90  * Thread structure
  91  */
  92 struct thread_struct {
  93         s390_fp_regs fp_regs;
  94         unsigned int  acrs[NUM_ACRS];
  95         unsigned long ksp;              /* kernel stack pointer             */
  96         unsigned long user_seg;         /* HSTD                             */
  97         mm_segment_t mm_segment;
  98         unsigned long prot_addr;        /* address of protection-excep.     */
  99         unsigned int error_code;        /* error-code of last prog-excep.   */
 100         unsigned int trap_no;
 101         per_struct per_info;
 102         /* Used to give failing instruction back to user for ieee exceptions */
 103         unsigned long ieee_instruction_pointer;
 104         /* pfault_wait is used to block the process on a pfault event */
 105         unsigned long pfault_wait;
 106 };
 107
 108 typedef struct thread_struct thread_struct;
 109
 110 /*
 111  * Stack layout of a C stack frame.
 112  */
 113 #ifndef __PACK_STACK
 114 struct stack_frame {
 115         unsigned long back_chain;
 116         unsigned long empty1[5];
 117         unsigned long gprs[10];
 118         unsigned int  empty2[8];
 119 };
 120 #else
 121 struct stack_frame {
 122         unsigned long empty1[5];
 123         unsigned int  empty2[8];
 124         unsigned long gprs[10];
 125         unsigned long back_chain;
 126 };
 127 #endif
 128
 129 #define ARCH_MIN_TASKALIGN      8
 130
 131 #ifndef __s390x__
 132 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
 133 #else /* __s390x__ */
 134 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
 135 #endif /* __s390x__ */
 136
 137 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0},              \
 138                             {0},{0},{0},{0},{0},{0}}},                         \
 139                      {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},         \
 140                      sizeof(init_stack) + (unsigned long) &init_stack,         \
 141                      __SWAPPER_PG_DIR,                                         \
 142                      {0},                                                      \
 143                      0,0,0,                                                    \
 144                      (per_struct) {{{{0,}}},0,0,0,0,{{0,}}},                   \
 145                      0, 0                                                      \
 146 }
 147
 148 /*
 149  * Do necessary setup to start up a new thread.
 150  */
 151 #ifndef __s390x__
 152
 153 #define start_thread(regs, new_psw, new_stackp) do {            \
 154         set_fs(USER_DS);                                        \
 155         regs->psw.mask  = psw_user_bits;                        \
 156         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 157         regs->gprs[15]  = new_stackp ;                          \
 158 } while (0)
 159
 160 #else /* __s390x__ */
 161
 162 #define start_thread(regs, new_psw, new_stackp) do {            \
 163         set_fs(USER_DS);                                        \
 164         regs->psw.mask  = psw_user_bits;                        \
 165         regs->psw.addr  = new_psw;                              \
 166         regs->gprs[15]  = new_stackp;                           \
 167 } while (0)
 168
 169 #define start_thread31(regs, new_psw, new_stackp) do {          \
 170         set_fs(USER_DS);                                        \
 171         regs->psw.mask  = psw_user32_bits;                      \
 172         regs->psw.addr  = new_psw;                              \
 173         regs->gprs[15]  = new_stackp;                           \
 174 } while (0)
 175
 176 #endif /* __s390x__ */
 177
 178 /* Forward declaration, a strange C thing */
 179 struct task_struct;
 180 struct mm_struct;
 181
 182 /* Free all resources held by a thread. */
 183 extern void release_thread(struct task_struct *);
 184 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 185
 186 /* Prepare to copy thread state - unlazy all lazy status */
 187 #define prepare_to_copy(tsk)    do { } while (0)
 188
 189 /*
 190  * Return saved PC of a blocked thread.
 191  */
 192 extern unsigned long thread_saved_pc(struct task_struct *t);
 193
 194 /*
 195  * Print register of task into buffer. Used in fs/proc/array.c.
 196  */
 197 extern char *task_show_regs(struct task_struct *task, char *buffer);
 198
 199 extern void show_registers(struct pt_regs *regs);
 200 extern void show_code(struct pt_regs *regs);
 201 extern void show_trace(struct task_struct *task, unsigned long *sp);
 202
 203 unsigned long get_wchan(struct task_struct *p);
 204 #define task_pt_regs(tsk) ((struct pt_regs *) \
 205         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 206 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 207 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 208
 209 /*
 210  * Give up the time slice of the virtual PU.
 211  */
 212 static inline void cpu_relax(void)
 213 {
 214         if (MACHINE_HAS_DIAG44)
 215                 asm volatile("diag 0,0,68");
 216         barrier();
 217 }
 218
 219 static inline void psw_set_key(unsigned int key)
 220 {
 221         asm volatile("spka 0(%0)" : : "d" (key));
 222 }
 223
 224 /*
 225  * Set PSW to specified value.
 226  */
 227 static inline void __load_psw(psw_t psw)
 228 {
 229 #ifndef __s390x__
 230         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 231 #else
 232         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 233 #endif
 234 }
 235
 236 /*
 237  * Set PSW mask to specified value, while leaving the
 238  * PSW addr pointing to the next instruction.
 239  */
 240
 241 static inline void __load_psw_mask (unsigned long mask)
 242 {
 243         unsigned long addr;
 244         psw_t psw;
 245
 246         psw.mask = mask;
 247
 248 #ifndef __s390x__
 249         asm volatile(
 250                 "       basr    %0,0\n"
 251                 "0:     ahi     %0,1f-0b\n"
 252                 "       st      %0,4(%1)\n"
 253                 "       lpsw    0(%1)\n"
 254                 "1:"
 255                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 256 #else /* __s390x__ */
 257         asm volatile(
 258                 "       larl    %0,1f\n"
 259                 "       stg     %0,8(%1)\n"
 260                 "       lpswe   0(%1)\n"
 261                 "1:"
 262                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 263 #endif /* __s390x__ */
 264 }
 265
 266 /*
 267  * Function to stop a processor until an interruption occurred
 268  */
 269 static inline void enabled_wait(void)
 270 {
 271         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 272                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 273 }
 274
 275 /*
 276  * Function to drop a processor into disabled wait state
 277  */
 278
 279 static inline void disabled_wait(unsigned long code)
 280 {
 281         unsigned long ctl_buf;
 282         psw_t dw_psw;
 283
 284         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 285         dw_psw.addr = code;
 286         /*
 287          * Store status and then load disabled wait psw,
 288          * the processor is dead afterwards
 289          */
 290 #ifndef __s390x__
 291         asm volatile(
 292                 "       stctl   0,0,0(%2)\n"
 293                 "       ni      0(%2),0xef\n"   /* switch off protection */
 294                 "       lctl    0,0,0(%2)\n"
 295                 "       stpt    0xd8\n"         /* store timer */
 296                 "       stckc   0xe0\n"         /* store clock comparator */
 297                 "       stpx    0x108\n"        /* store prefix register */
 298                 "       stam    0,15,0x120\n"   /* store access registers */
 299                 "       std     0,0x160\n"      /* store f0 */
 300                 "       std     2,0x168\n"      /* store f2 */
 301                 "       std     4,0x170\n"      /* store f4 */
 302                 "       std     6,0x178\n"      /* store f6 */
 303                 "       stm     0,15,0x180\n"   /* store general registers */
 304                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 305                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 306                 "       lpsw    0(%1)"
 307                 : "=m" (ctl_buf)
 308                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 309 #else /* __s390x__ */
 310         asm volatile(
 311                 "       stctg   0,0,0(%2)\n"
 312                 "       ni      4(%2),0xef\n"   /* switch off protection */
 313                 "       lctlg   0,0,0(%2)\n"
 314                 "       lghi    1,0x1000\n"
 315                 "       stpt    0x328(1)\n"     /* store timer */
 316                 "       stckc   0x330(1)\n"     /* store clock comparator */
 317                 "       stpx    0x318(1)\n"     /* store prefix register */
 318                 "       stam    0,15,0x340(1)\n"/* store access registers */
 319                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 320                 "       std     0,0x200(1)\n"   /* store f0 */
 321                 "       std     1,0x208(1)\n"   /* store f1 */
 322                 "       std     2,0x210(1)\n"   /* store f2 */
 323                 "       std     3,0x218(1)\n"   /* store f3 */
 324                 "       std     4,0x220(1)\n"   /* store f4 */
 325                 "       std     5,0x228(1)\n"   /* store f5 */
 326                 "       std     6,0x230(1)\n"   /* store f6 */
 327                 "       std     7,0x238(1)\n"   /* store f7 */
 328                 "       std     8,0x240(1)\n"   /* store f8 */
 329                 "       std     9,0x248(1)\n"   /* store f9 */
 330                 "       std     10,0x250(1)\n"  /* store f10 */
 331                 "       std     11,0x258(1)\n"  /* store f11 */
 332                 "       std     12,0x260(1)\n"  /* store f12 */
 333                 "       std     13,0x268(1)\n"  /* store f13 */
 334                 "       std     14,0x270(1)\n"  /* store f14 */
 335                 "       std     15,0x278(1)\n"  /* store f15 */
 336                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 337                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 338                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 339                 "       lpswe   0(%1)"
 340                 : "=m" (ctl_buf)
 341                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
 342 #endif /* __s390x__ */
 343 }
 344
 345 /*
 346  * Basic Machine Check/Program Check Handler.
 347  */
 348
 349 extern void s390_base_mcck_handler(void);
 350 extern void s390_base_pgm_handler(void);
 351 extern void s390_base_ext_handler(void);
 352
 353 extern void (*s390_base_mcck_handler_fn)(void);
 354 extern void (*s390_base_pgm_handler_fn)(void);
 355 extern void (*s390_base_ext_handler_fn)(void);
 356
 357 /*
 358  * CPU idle notifier chain.
 359  */
 360 #define S390_CPU_IDLE           0
 361 #define S390_CPU_NOT_IDLE       1
 362
 363 struct notifier_block;
 364 int register_idle_notifier(struct notifier_block *nb);
 365 int unregister_idle_notifier(struct notifier_block *nb);
 366
 367 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 368
 369 #endif
 370
 371 /*
 372  * Helper macro for exception table entries
 373  */
 374 #ifndef __s390x__
 375 #define EX_TABLE(_fault,_target)                        \
 376         ".section __ex_table,\"a\"\n"                   \
 377         "       .align 4\n"                             \
 378         "       .long  " #_fault "," #_target "\n"      \
 379         ".previous\n"
 380 #else
 381 #define EX_TABLE(_fault,_target)                        \
 382         ".section __ex_table,\"a\"\n"                   \
 383         "       .align 8\n"                             \
 384         "       .quad  " #_fault "," #_target "\n"      \
 385         ".previous\n"
 386 #endif
 387
 388 #endif                                 /* __ASM_S390_PROCESSOR_H           */