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 struct cpuinfo_S390
  40 {
  41         cpuid_t  cpu_id;
  42         __u16    cpu_addr;
  43         __u16    cpu_nr;
  44         unsigned long loops_per_jiffy;
  45         unsigned long *pgd_quick;
  46 #ifdef __s390x__
  47         unsigned long *pmd_quick;
  48 #endif /* __s390x__ */
  49         unsigned long *pte_quick;
  50         unsigned long pgtable_cache_sz;
  51 };
  52
  53 extern void print_cpu_info(struct cpuinfo_S390 *);
  54
  55 /* Lazy FPU handling on uni-processor */
  56 extern struct task_struct *last_task_used_math;
  57
  58 /*
  59  * User space process size: 2GB for 31 bit, 4TB for 64 bit.
  60  */
  61 #ifndef __s390x__
  62
  63 # define TASK_SIZE              (0x80000000UL)
  64 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  65 # define DEFAULT_TASK_SIZE      (0x80000000UL)
  66
  67 #else /* __s390x__ */
  68
  69 # define TASK_SIZE              (test_thread_flag(TIF_31BIT) ? \
  70                                         (0x80000000UL) : (0x40000000000UL))
  71 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  72 # define DEFAULT_TASK_SIZE      (0x40000000000UL)
  73
  74 #endif /* __s390x__ */
  75
  76 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  77
  78 typedef struct {
  79         __u32 ar4;
  80 } mm_segment_t;
  81
  82 /*
  83  * Thread structure
  84  */
  85 struct thread_struct {
  86         s390_fp_regs fp_regs;
  87         unsigned int  acrs[NUM_ACRS];
  88         unsigned long ksp;              /* kernel stack pointer             */
  89         unsigned long user_seg;         /* HSTD                             */
  90         mm_segment_t mm_segment;
  91         unsigned long prot_addr;        /* address of protection-excep.     */
  92         unsigned int error_code;        /* error-code of last prog-excep.   */
  93         unsigned int trap_no;
  94         per_struct per_info;
  95         /* Used to give failing instruction back to user for ieee exceptions */
  96         unsigned long ieee_instruction_pointer;
  97         /* pfault_wait is used to block the process on a pfault event */
  98         unsigned long pfault_wait;
  99 };
 100
 101 typedef struct thread_struct thread_struct;
 102
 103 /*
 104  * Stack layout of a C stack frame.
 105  */
 106 #ifndef __PACK_STACK
 107 struct stack_frame {
 108         unsigned long back_chain;
 109         unsigned long empty1[5];
 110         unsigned long gprs[10];
 111         unsigned int  empty2[8];
 112 };
 113 #else
 114 struct stack_frame {
 115         unsigned long empty1[5];
 116         unsigned int  empty2[8];
 117         unsigned long gprs[10];
 118         unsigned long back_chain;
 119 };
 120 #endif
 121
 122 #define ARCH_MIN_TASKALIGN      8
 123
 124 #ifndef __s390x__
 125 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
 126 #else /* __s390x__ */
 127 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
 128 #endif /* __s390x__ */
 129
 130 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0},              \
 131                             {0},{0},{0},{0},{0},{0}}},                         \
 132                      {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},         \
 133                      sizeof(init_stack) + (unsigned long) &init_stack,         \
 134                      __SWAPPER_PG_DIR,                                         \
 135                      {0},                                                      \
 136                      0,0,0,                                                    \
 137                      (per_struct) {{{{0,}}},0,0,0,0,{{0,}}},                   \
 138                      0, 0                                                      \
 139 }
 140
 141 /*
 142  * Do necessary setup to start up a new thread.
 143  */
 144 #ifndef __s390x__
 145
 146 #define start_thread(regs, new_psw, new_stackp) do {            \
 147         regs->psw.mask  = PSW_USER_BITS;                        \
 148         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 149         regs->gprs[15]  = new_stackp ;                          \
 150 } while (0)
 151
 152 #else /* __s390x__ */
 153
 154 #define start_thread(regs, new_psw, new_stackp) do {            \
 155         regs->psw.mask  = PSW_USER_BITS;                        \
 156         regs->psw.addr  = new_psw;                              \
 157         regs->gprs[15]  = new_stackp;                           \
 158 } while (0)
 159
 160 #define start_thread31(regs, new_psw, new_stackp) do {          \
 161         regs->psw.mask  = PSW_USER32_BITS;                      \
 162         regs->psw.addr  = new_psw;                              \
 163         regs->gprs[15]  = new_stackp;                           \
 164 } while (0)
 165
 166 #endif /* __s390x__ */
 167
 168 /* Forward declaration, a strange C thing */
 169 struct task_struct;
 170 struct mm_struct;
 171
 172 /* Free all resources held by a thread. */
 173 extern void release_thread(struct task_struct *);
 174 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 175
 176 /* Prepare to copy thread state - unlazy all lazy status */
 177 #define prepare_to_copy(tsk)    do { } while (0)
 178
 179 /*
 180  * Return saved PC of a blocked thread.
 181  */
 182 extern unsigned long thread_saved_pc(struct task_struct *t);
 183
 184 /*
 185  * Print register of task into buffer. Used in fs/proc/array.c.
 186  */
 187 extern char *task_show_regs(struct task_struct *task, char *buffer);
 188
 189 extern void show_registers(struct pt_regs *regs);
 190 extern void show_trace(struct task_struct *task, unsigned long *sp);
 191
 192 unsigned long get_wchan(struct task_struct *p);
 193 #define task_pt_regs(tsk) ((struct pt_regs *) \
 194         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 195 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 196 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 197
 198 /*
 199  * Give up the time slice of the virtual PU.
 200  */
 201 static inline void cpu_relax(void)
 202 {
 203         if (MACHINE_HAS_DIAG44)
 204                 asm volatile("diag 0,0,68" : : : "memory");
 205         else
 206                 barrier();
 207 }
 208
 209 /*
 210  * Set PSW to specified value.
 211  */
 212 static inline void __load_psw(psw_t psw)
 213 {
 214 #ifndef __s390x__
 215         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 216 #else
 217         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 218 #endif
 219 }
 220
 221 /*
 222  * Set PSW mask to specified value, while leaving the
 223  * PSW addr pointing to the next instruction.
 224  */
 225
 226 static inline void __load_psw_mask (unsigned long mask)
 227 {
 228         unsigned long addr;
 229         psw_t psw;
 230
 231         psw.mask = mask;
 232
 233 #ifndef __s390x__
 234         asm volatile(
 235                 "       basr    %0,0\n"
 236                 "0:     ahi     %0,1f-0b\n"
 237                 "       st      %0,4(%1)\n"
 238                 "       lpsw    0(%1)\n"
 239                 "1:"
 240                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 241 #else /* __s390x__ */
 242         asm volatile(
 243                 "       larl    %0,1f\n"
 244                 "       stg     %0,8(%1)\n"
 245                 "       lpswe   0(%1)\n"
 246                 "1:"
 247                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 248 #endif /* __s390x__ */
 249 }
 250
 251 /*
 252  * Function to stop a processor until an interruption occurred
 253  */
 254 static inline void enabled_wait(void)
 255 {
 256         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 257                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 258 }
 259
 260 /*
 261  * Function to drop a processor into disabled wait state
 262  */
 263
 264 static inline void disabled_wait(unsigned long code)
 265 {
 266         unsigned long ctl_buf;
 267         psw_t dw_psw;
 268
 269         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 270         dw_psw.addr = code;
 271         /*
 272          * Store status and then load disabled wait psw,
 273          * the processor is dead afterwards
 274          */
 275 #ifndef __s390x__
 276         asm volatile(
 277                 "       stctl   0,0,0(%2)\n"
 278                 "       ni      0(%2),0xef\n"   /* switch off protection */
 279                 "       lctl    0,0,0(%2)\n"
 280                 "       stpt    0xd8\n"         /* store timer */
 281                 "       stckc   0xe0\n"         /* store clock comparator */
 282                 "       stpx    0x108\n"        /* store prefix register */
 283                 "       stam    0,15,0x120\n"   /* store access registers */
 284                 "       std     0,0x160\n"      /* store f0 */
 285                 "       std     2,0x168\n"      /* store f2 */
 286                 "       std     4,0x170\n"      /* store f4 */
 287                 "       std     6,0x178\n"      /* store f6 */
 288                 "       stm     0,15,0x180\n"   /* store general registers */
 289                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 290                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 291                 "       lpsw    0(%1)"
 292                 : "=m" (ctl_buf)
 293                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 294 #else /* __s390x__ */
 295         asm volatile(
 296                 "       stctg   0,0,0(%2)\n"
 297                 "       ni      4(%2),0xef\n"   /* switch off protection */
 298                 "       lctlg   0,0,0(%2)\n"
 299                 "       lghi    1,0x1000\n"
 300                 "       stpt    0x328(1)\n"     /* store timer */
 301                 "       stckc   0x330(1)\n"     /* store clock comparator */
 302                 "       stpx    0x318(1)\n"     /* store prefix register */
 303                 "       stam    0,15,0x340(1)\n"/* store access registers */
 304                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 305                 "       std     0,0x200(1)\n"   /* store f0 */
 306                 "       std     1,0x208(1)\n"   /* store f1 */
 307                 "       std     2,0x210(1)\n"   /* store f2 */
 308                 "       std     3,0x218(1)\n"   /* store f3 */
 309                 "       std     4,0x220(1)\n"   /* store f4 */
 310                 "       std     5,0x228(1)\n"   /* store f5 */
 311                 "       std     6,0x230(1)\n"   /* store f6 */
 312                 "       std     7,0x238(1)\n"   /* store f7 */
 313                 "       std     8,0x240(1)\n"   /* store f8 */
 314                 "       std     9,0x248(1)\n"   /* store f9 */
 315                 "       std     10,0x250(1)\n"  /* store f10 */
 316                 "       std     11,0x258(1)\n"  /* store f11 */
 317                 "       std     12,0x260(1)\n"  /* store f12 */
 318                 "       std     13,0x268(1)\n"  /* store f13 */
 319                 "       std     14,0x270(1)\n"  /* store f14 */
 320                 "       std     15,0x278(1)\n"  /* store f15 */
 321                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 322                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 323                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 324                 "       lpswe   0(%1)"
 325                 : "=m" (ctl_buf)
 326                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
 327 #endif /* __s390x__ */
 328 }
 329
 330 /*
 331  * CPU idle notifier chain.
 332  */
 333 #define CPU_IDLE        0
 334 #define CPU_NOT_IDLE    1
 335
 336 struct notifier_block;
 337 int register_idle_notifier(struct notifier_block *nb);
 338 int unregister_idle_notifier(struct notifier_block *nb);
 339
 340 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 341
 342 #endif
 343
 344 /*
 345  * Helper macro for exception table entries
 346  */
 347 #ifndef __s390x__
 348 #define EX_TABLE(_fault,_target)                        \
 349         ".section __ex_table,\"a\"\n"                   \
 350         "       .align 4\n"                             \
 351         "       .long  " #_fault "," #_target "\n"      \
 352         ".previous\n"
 353 #else
 354 #define EX_TABLE(_fault,_target)                        \
 355         ".section __ex_table,\"a\"\n"                   \
 356         "       .align 8\n"                             \
 357         "       .quad  " #_fault "," #_target "\n"      \
 358         ".previous\n"
 359 #endif
 360
 361 #endif                                 /* __ASM_S390_PROCESSOR_H           */