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         mm_segment_t mm_segment;
  97         unsigned long prot_addr;        /* address of protection-excep.     */
  98         unsigned int error_code;        /* error-code of last prog-excep.   */
  99         unsigned int trap_no;
 100         per_struct per_info;
 101         /* Used to give failing instruction back to user for ieee exceptions */
 102         unsigned long ieee_instruction_pointer;
 103         /* pfault_wait is used to block the process on a pfault event */
 104         unsigned long pfault_wait;
 105 };
 106
 107 typedef struct thread_struct thread_struct;
 108
 109 /*
 110  * Stack layout of a C stack frame.
 111  */
 112 #ifndef __PACK_STACK
 113 struct stack_frame {
 114         unsigned long back_chain;
 115         unsigned long empty1[5];
 116         unsigned long gprs[10];
 117         unsigned int  empty2[8];
 118 };
 119 #else
 120 struct stack_frame {
 121         unsigned long empty1[5];
 122         unsigned int  empty2[8];
 123         unsigned long gprs[10];
 124         unsigned long back_chain;
 125 };
 126 #endif
 127
 128 #define ARCH_MIN_TASKALIGN      8
 129
 130 #define INIT_THREAD {                                                   \
 131         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 132 }
 133
 134 /*
 135  * Do necessary setup to start up a new thread.
 136  */
 137 #ifndef __s390x__
 138
 139 #define start_thread(regs, new_psw, new_stackp) do {            \
 140         set_fs(USER_DS);                                        \
 141         regs->psw.mask  = psw_user_bits;                        \
 142         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 143         regs->gprs[15]  = new_stackp ;                          \
 144 } while (0)
 145
 146 #else /* __s390x__ */
 147
 148 #define start_thread(regs, new_psw, new_stackp) do {            \
 149         set_fs(USER_DS);                                        \
 150         regs->psw.mask  = psw_user_bits;                        \
 151         regs->psw.addr  = new_psw;                              \
 152         regs->gprs[15]  = new_stackp;                           \
 153 } while (0)
 154
 155 #define start_thread31(regs, new_psw, new_stackp) do {          \
 156         set_fs(USER_DS);                                        \
 157         regs->psw.mask  = psw_user32_bits;                      \
 158         regs->psw.addr  = new_psw;                              \
 159         regs->gprs[15]  = new_stackp;                           \
 160 } while (0)
 161
 162 #endif /* __s390x__ */
 163
 164 /* Forward declaration, a strange C thing */
 165 struct task_struct;
 166 struct mm_struct;
 167
 168 /* Free all resources held by a thread. */
 169 extern void release_thread(struct task_struct *);
 170 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 171
 172 /* Prepare to copy thread state - unlazy all lazy status */
 173 #define prepare_to_copy(tsk)    do { } while (0)
 174
 175 /*
 176  * Return saved PC of a blocked thread.
 177  */
 178 extern unsigned long thread_saved_pc(struct task_struct *t);
 179
 180 /*
 181  * Print register of task into buffer. Used in fs/proc/array.c.
 182  */
 183 extern char *task_show_regs(struct task_struct *task, char *buffer);
 184
 185 extern void show_registers(struct pt_regs *regs);
 186 extern void show_code(struct pt_regs *regs);
 187 extern void show_trace(struct task_struct *task, unsigned long *sp);
 188
 189 unsigned long get_wchan(struct task_struct *p);
 190 #define task_pt_regs(tsk) ((struct pt_regs *) \
 191         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 192 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 193 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 194
 195 /*
 196  * Give up the time slice of the virtual PU.
 197  */
 198 static inline void cpu_relax(void)
 199 {
 200         if (MACHINE_HAS_DIAG44)
 201                 asm volatile("diag 0,0,68");
 202         barrier();
 203 }
 204
 205 static inline void psw_set_key(unsigned int key)
 206 {
 207         asm volatile("spka 0(%0)" : : "d" (key));
 208 }
 209
 210 /*
 211  * Set PSW to specified value.
 212  */
 213 static inline void __load_psw(psw_t psw)
 214 {
 215 #ifndef __s390x__
 216         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 217 #else
 218         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 219 #endif
 220 }
 221
 222 /*
 223  * Set PSW mask to specified value, while leaving the
 224  * PSW addr pointing to the next instruction.
 225  */
 226
 227 static inline void __load_psw_mask (unsigned long mask)
 228 {
 229         unsigned long addr;
 230         psw_t psw;
 231
 232         psw.mask = mask;
 233
 234 #ifndef __s390x__
 235         asm volatile(
 236                 "       basr    %0,0\n"
 237                 "0:     ahi     %0,1f-0b\n"
 238                 "       st      %0,4(%1)\n"
 239                 "       lpsw    0(%1)\n"
 240                 "1:"
 241                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 242 #else /* __s390x__ */
 243         asm volatile(
 244                 "       larl    %0,1f\n"
 245                 "       stg     %0,8(%1)\n"
 246                 "       lpswe   0(%1)\n"
 247                 "1:"
 248                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 249 #endif /* __s390x__ */
 250 }
 251
 252 /*
 253  * Function to stop a processor until an interruption occurred
 254  */
 255 static inline void enabled_wait(void)
 256 {
 257         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 258                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 259 }
 260
 261 /*
 262  * Function to drop a processor into disabled wait state
 263  */
 264
 265 static inline void disabled_wait(unsigned long code)
 266 {
 267         unsigned long ctl_buf;
 268         psw_t dw_psw;
 269
 270         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 271         dw_psw.addr = code;
 272         /*
 273          * Store status and then load disabled wait psw,
 274          * the processor is dead afterwards
 275          */
 276 #ifndef __s390x__
 277         asm volatile(
 278                 "       stctl   0,0,0(%2)\n"
 279                 "       ni      0(%2),0xef\n"   /* switch off protection */
 280                 "       lctl    0,0,0(%2)\n"
 281                 "       stpt    0xd8\n"         /* store timer */
 282                 "       stckc   0xe0\n"         /* store clock comparator */
 283                 "       stpx    0x108\n"        /* store prefix register */
 284                 "       stam    0,15,0x120\n"   /* store access registers */
 285                 "       std     0,0x160\n"      /* store f0 */
 286                 "       std     2,0x168\n"      /* store f2 */
 287                 "       std     4,0x170\n"      /* store f4 */
 288                 "       std     6,0x178\n"      /* store f6 */
 289                 "       stm     0,15,0x180\n"   /* store general registers */
 290                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 291                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 292                 "       lpsw    0(%1)"
 293                 : "=m" (ctl_buf)
 294                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 295 #else /* __s390x__ */
 296         asm volatile(
 297                 "       stctg   0,0,0(%2)\n"
 298                 "       ni      4(%2),0xef\n"   /* switch off protection */
 299                 "       lctlg   0,0,0(%2)\n"
 300                 "       lghi    1,0x1000\n"
 301                 "       stpt    0x328(1)\n"     /* store timer */
 302                 "       stckc   0x330(1)\n"     /* store clock comparator */
 303                 "       stpx    0x318(1)\n"     /* store prefix register */
 304                 "       stam    0,15,0x340(1)\n"/* store access registers */
 305                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 306                 "       std     0,0x200(1)\n"   /* store f0 */
 307                 "       std     1,0x208(1)\n"   /* store f1 */
 308                 "       std     2,0x210(1)\n"   /* store f2 */
 309                 "       std     3,0x218(1)\n"   /* store f3 */
 310                 "       std     4,0x220(1)\n"   /* store f4 */
 311                 "       std     5,0x228(1)\n"   /* store f5 */
 312                 "       std     6,0x230(1)\n"   /* store f6 */
 313                 "       std     7,0x238(1)\n"   /* store f7 */
 314                 "       std     8,0x240(1)\n"   /* store f8 */
 315                 "       std     9,0x248(1)\n"   /* store f9 */
 316                 "       std     10,0x250(1)\n"  /* store f10 */
 317                 "       std     11,0x258(1)\n"  /* store f11 */
 318                 "       std     12,0x260(1)\n"  /* store f12 */
 319                 "       std     13,0x268(1)\n"  /* store f13 */
 320                 "       std     14,0x270(1)\n"  /* store f14 */
 321                 "       std     15,0x278(1)\n"  /* store f15 */
 322                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 323                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 324                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 325                 "       lpswe   0(%1)"
 326                 : "=m" (ctl_buf)
 327                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
 328 #endif /* __s390x__ */
 329 }
 330
 331 /*
 332  * Basic Machine Check/Program Check Handler.
 333  */
 334
 335 extern void s390_base_mcck_handler(void);
 336 extern void s390_base_pgm_handler(void);
 337 extern void s390_base_ext_handler(void);
 338
 339 extern void (*s390_base_mcck_handler_fn)(void);
 340 extern void (*s390_base_pgm_handler_fn)(void);
 341 extern void (*s390_base_ext_handler_fn)(void);
 342
 343 /*
 344  * CPU idle notifier chain.
 345  */
 346 #define S390_CPU_IDLE           0
 347 #define S390_CPU_NOT_IDLE       1
 348
 349 struct notifier_block;
 350 int register_idle_notifier(struct notifier_block *nb);
 351 int unregister_idle_notifier(struct notifier_block *nb);
 352
 353 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 354
 355 #endif
 356
 357 /*
 358  * Helper macro for exception table entries
 359  */
 360 #ifndef __s390x__
 361 #define EX_TABLE(_fault,_target)                        \
 362         ".section __ex_table,\"a\"\n"                   \
 363         "       .align 4\n"                             \
 364         "       .long  " #_fault "," #_target "\n"      \
 365         ".previous\n"
 366 #else
 367 #define EX_TABLE(_fault,_target)                        \
 368         ".section __ex_table,\"a\"\n"                   \
 369         "       .align 8\n"                             \
 370         "       .quad  " #_fault "," #_target "\n"      \
 371         ".previous\n"
 372 #endif
 373
 374 #endif                                 /* __ASM_S390_PROCESSOR_H           */