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 /*
  63  * User space process size: 2GB for 31 bit, 4TB for 64 bit.
  64  */
  65 #ifndef __s390x__
  66
  67 #define TASK_SIZE               (1UL << 31)
  68 #define TASK_UNMAPPED_BASE      (1UL << 30)
  69
  70 #else /* __s390x__ */
  71
  72 #define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
  73                                         (1UL << 31) : (1UL << 53))
  74 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  75                                         (1UL << 30) : (1UL << 41))
  76 #define TASK_SIZE               TASK_SIZE_OF(current)
  77
  78 #endif /* __s390x__ */
  79
  80 #ifdef __KERNEL__
  81
  82 #ifndef __s390x__
  83 #define STACK_TOP               (1UL << 31)
  84 #define STACK_TOP_MAX           (1UL << 31)
  85 #else /* __s390x__ */
  86 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
  87 #define STACK_TOP_MAX           (1UL << 42)
  88 #endif /* __s390x__ */
  89
  90
  91 #endif
  92
  93 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  94
  95 typedef struct {
  96         __u32 ar4;
  97 } mm_segment_t;
  98
  99 /*
 100  * Thread structure
 101  */
 102 struct thread_struct {
 103         s390_fp_regs fp_regs;
 104         unsigned int  acrs[NUM_ACRS];
 105         unsigned long ksp;              /* kernel stack pointer             */
 106         mm_segment_t mm_segment;
 107         unsigned long prot_addr;        /* address of protection-excep.     */
 108         unsigned int trap_no;
 109         per_struct per_info;
 110         /* Used to give failing instruction back to user for ieee exceptions */
 111         unsigned long ieee_instruction_pointer;
 112         /* pfault_wait is used to block the process on a pfault event */
 113         unsigned long pfault_wait;
 114 };
 115
 116 typedef struct thread_struct thread_struct;
 117
 118 /*
 119  * Stack layout of a C stack frame.
 120  */
 121 #ifndef __PACK_STACK
 122 struct stack_frame {
 123         unsigned long back_chain;
 124         unsigned long empty1[5];
 125         unsigned long gprs[10];
 126         unsigned int  empty2[8];
 127 };
 128 #else
 129 struct stack_frame {
 130         unsigned long empty1[5];
 131         unsigned int  empty2[8];
 132         unsigned long gprs[10];
 133         unsigned long back_chain;
 134 };
 135 #endif
 136
 137 #define ARCH_MIN_TASKALIGN      8
 138
 139 #define INIT_THREAD {                                                   \
 140         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 141 }
 142
 143 /*
 144  * Do necessary setup to start up a new thread.
 145  */
 146 #define start_thread(regs, new_psw, new_stackp) do {            \
 147         set_fs(USER_DS);                                        \
 148         regs->psw.mask  = psw_user_bits;                        \
 149         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 150         regs->gprs[15]  = new_stackp ;                          \
 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 /* Free all resources held by a thread. */
 159 extern void release_thread(struct task_struct *);
 160 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 161
 162 /* Prepare to copy thread state - unlazy all lazy status */
 163 #define prepare_to_copy(tsk)    do { } while (0)
 164
 165 /*
 166  * Return saved PC of a blocked thread.
 167  */
 168 extern unsigned long thread_saved_pc(struct task_struct *t);
 169
 170 /*
 171  * Print register of task into buffer. Used in fs/proc/array.c.
 172  */
 173 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
 174
 175 extern void show_code(struct pt_regs *regs);
 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 /*
 184  * Give up the time slice of the virtual PU.
 185  */
 186 static inline void cpu_relax(void)
 187 {
 188         if (MACHINE_HAS_DIAG44)
 189                 asm volatile("diag 0,0,68");
 190         barrier();
 191 }
 192
 193 static inline void psw_set_key(unsigned int key)
 194 {
 195         asm volatile("spka 0(%0)" : : "d" (key));
 196 }
 197
 198 /*
 199  * Set PSW to specified value.
 200  */
 201 static inline void __load_psw(psw_t psw)
 202 {
 203 #ifndef __s390x__
 204         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 205 #else
 206         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 207 #endif
 208 }
 209
 210 /*
 211  * Set PSW mask to specified value, while leaving the
 212  * PSW addr pointing to the next instruction.
 213  */
 214
 215 static inline void __load_psw_mask (unsigned long mask)
 216 {
 217         unsigned long addr;
 218         psw_t psw;
 219
 220         psw.mask = mask;
 221
 222 #ifndef __s390x__
 223         asm volatile(
 224                 "       basr    %0,0\n"
 225                 "0:     ahi     %0,1f-0b\n"
 226                 "       st      %0,4(%1)\n"
 227                 "       lpsw    0(%1)\n"
 228                 "1:"
 229                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 230 #else /* __s390x__ */
 231         asm volatile(
 232                 "       larl    %0,1f\n"
 233                 "       stg     %0,8(%1)\n"
 234                 "       lpswe   0(%1)\n"
 235                 "1:"
 236                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 237 #endif /* __s390x__ */
 238 }
 239
 240 /*
 241  * Function to stop a processor until an interruption occurred
 242  */
 243 static inline void enabled_wait(void)
 244 {
 245         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 246                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 247 }
 248
 249 /*
 250  * Function to drop a processor into disabled wait state
 251  */
 252
 253 static inline void disabled_wait(unsigned long code)
 254 {
 255         unsigned long ctl_buf;
 256         psw_t dw_psw;
 257
 258         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 259         dw_psw.addr = code;
 260         /*
 261          * Store status and then load disabled wait psw,
 262          * the processor is dead afterwards
 263          */
 264 #ifndef __s390x__
 265         asm volatile(
 266                 "       stctl   0,0,0(%2)\n"
 267                 "       ni      0(%2),0xef\n"   /* switch off protection */
 268                 "       lctl    0,0,0(%2)\n"
 269                 "       stpt    0xd8\n"         /* store timer */
 270                 "       stckc   0xe0\n"         /* store clock comparator */
 271                 "       stpx    0x108\n"        /* store prefix register */
 272                 "       stam    0,15,0x120\n"   /* store access registers */
 273                 "       std     0,0x160\n"      /* store f0 */
 274                 "       std     2,0x168\n"      /* store f2 */
 275                 "       std     4,0x170\n"      /* store f4 */
 276                 "       std     6,0x178\n"      /* store f6 */
 277                 "       stm     0,15,0x180\n"   /* store general registers */
 278                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 279                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 280                 "       lpsw    0(%1)"
 281                 : "=m" (ctl_buf)
 282                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 283 #else /* __s390x__ */
 284         asm volatile(
 285                 "       stctg   0,0,0(%2)\n"
 286                 "       ni      4(%2),0xef\n"   /* switch off protection */
 287                 "       lctlg   0,0,0(%2)\n"
 288                 "       lghi    1,0x1000\n"
 289                 "       stpt    0x328(1)\n"     /* store timer */
 290                 "       stckc   0x330(1)\n"     /* store clock comparator */
 291                 "       stpx    0x318(1)\n"     /* store prefix register */
 292                 "       stam    0,15,0x340(1)\n"/* store access registers */
 293                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 294                 "       std     0,0x200(1)\n"   /* store f0 */
 295                 "       std     1,0x208(1)\n"   /* store f1 */
 296                 "       std     2,0x210(1)\n"   /* store f2 */
 297                 "       std     3,0x218(1)\n"   /* store f3 */
 298                 "       std     4,0x220(1)\n"   /* store f4 */
 299                 "       std     5,0x228(1)\n"   /* store f5 */
 300                 "       std     6,0x230(1)\n"   /* store f6 */
 301                 "       std     7,0x238(1)\n"   /* store f7 */
 302                 "       std     8,0x240(1)\n"   /* store f8 */
 303                 "       std     9,0x248(1)\n"   /* store f9 */
 304                 "       std     10,0x250(1)\n"  /* store f10 */
 305                 "       std     11,0x258(1)\n"  /* store f11 */
 306                 "       std     12,0x260(1)\n"  /* store f12 */
 307                 "       std     13,0x268(1)\n"  /* store f13 */
 308                 "       std     14,0x270(1)\n"  /* store f14 */
 309                 "       std     15,0x278(1)\n"  /* store f15 */
 310                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 311                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 312                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 313                 "       lpswe   0(%1)"
 314                 : "=m" (ctl_buf)
 315                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
 316 #endif /* __s390x__ */
 317 }
 318
 319 /*
 320  * Basic Machine Check/Program Check Handler.
 321  */
 322
 323 extern void s390_base_mcck_handler(void);
 324 extern void s390_base_pgm_handler(void);
 325 extern void s390_base_ext_handler(void);
 326
 327 extern void (*s390_base_mcck_handler_fn)(void);
 328 extern void (*s390_base_pgm_handler_fn)(void);
 329 extern void (*s390_base_ext_handler_fn)(void);
 330
 331 /*
 332  * CPU idle notifier chain.
 333  */
 334 #define S390_CPU_IDLE           0
 335 #define S390_CPU_NOT_IDLE       1
 336
 337 struct notifier_block;
 338 int register_idle_notifier(struct notifier_block *nb);
 339 int unregister_idle_notifier(struct notifier_block *nb);
 340
 341 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 342
 343 #endif
 344
 345 /*
 346  * Helper macro for exception table entries
 347  */
 348 #ifndef __s390x__
 349 #define EX_TABLE(_fault,_target)                        \
 350         ".section __ex_table,\"a\"\n"                   \
 351         "       .align 4\n"                             \
 352         "       .long  " #_fault "," #_target "\n"      \
 353         ".previous\n"
 354 #else
 355 #define EX_TABLE(_fault,_target)                        \
 356         ".section __ex_table,\"a\"\n"                   \
 357         "       .align 8\n"                             \
 358         "       .quad  " #_fault "," #_target "\n"      \
 359         ".previous\n"
 360 #endif
 361
 362 #endif                                 /* __ASM_S390_PROCESSOR_H           */