LXR linux/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
  31typedef 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
  39static inline void get_cpu_id(cpuid_t *ptr)
  40{
  41        asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
  42}
  43
  44struct 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
  58extern void s390_adjust_jiffies(void);
  59extern void print_cpu_info(struct cpuinfo_S390 *);
  60extern int get_cpu_capability(unsigned int *);
  61
  62/* Lazy FPU handling on uni-processor */
  63extern 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
  85typedef struct {
  86        __u32 ar4;
  87} mm_segment_t;
  88
  89/*
  90 * Thread structure
  91 */
  92struct 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
 108typedef struct thread_struct thread_struct;
 109
 110/*
 111 * Stack layout of a C stack frame.
 112 */
 113#ifndef __PACK_STACK
 114struct 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
 121struct 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 */
 179struct task_struct;
 180struct mm_struct;
 181
 182/* Free all resources held by a thread. */
 183extern void release_thread(struct task_struct *);
 184extern 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 */
 192extern 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 */
 197extern char *task_show_regs(struct task_struct *task, char *buffer);
 198
 199extern void show_registers(struct pt_regs *regs);
 200extern void show_code(struct pt_regs *regs);
 201extern void show_trace(struct task_struct *task, unsigned long *sp);
 202
 203unsigned 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 */
 212static inline void cpu_relax(void)
 213{
 214        if (MACHINE_HAS_DIAG44)
 215                asm volatile("diag 0,0,68");
 216        barrier();
 217}
 218
 219static 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 */
 227static 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
 241static 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 */
 269static 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
 279static 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
 349extern void s390_base_mcck_handler(void);
 350extern void s390_base_pgm_handler(void);
 351extern void s390_base_ext_handler(void);
 352
 353extern void (*s390_base_mcck_handler_fn)(void);
 354extern void (*s390_base_pgm_handler_fn)(void);
 355extern void (*s390_base_ext_handler_fn)(void);
 356
 357/*
 358 * CPU idle notifier chain.
 359 */
 360#define CPU_IDLE        0
 361#define CPU_NOT_IDLE    1
 362
 363struct notifier_block;
 364int register_idle_notifier(struct notifier_block *nb);
 365int 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           */
 389