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