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 <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 #define start_thread31(regs, new_psw, new_stackp) do {          \
 154         set_fs(USER_DS);                                        \
 155         regs->psw.mask  = psw_user32_bits;                      \
 156         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 157         regs->gprs[15]  = new_stackp;                           \
 158         crst_table_downgrade(current->mm, 1UL << 31);           \
 159 } while (0)
 160
 161 /* Forward declaration, a strange C thing */
 162 struct task_struct;
 163 struct mm_struct;
 164 struct seq_file;
 165
 166 /* Free all resources held by a thread. */
 167 extern void release_thread(struct task_struct *);
 168 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 169
 170 /* Prepare to copy thread state - unlazy all lazy status */
 171 #define prepare_to_copy(tsk)    do { } while (0)
 172
 173 /*
 174  * Return saved PC of a blocked thread.
 175  */
 176 extern unsigned long thread_saved_pc(struct task_struct *t);
 177
 178 /*
 179  * Print register of task into buffer. Used in fs/proc/array.c.
 180  */
 181 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
 182
 183 extern void show_code(struct pt_regs *regs);
 184
 185 unsigned long get_wchan(struct task_struct *p);
 186 #define task_pt_regs(tsk) ((struct pt_regs *) \
 187         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 188 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 189 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 190
 191 /*
 192  * Give up the time slice of the virtual PU.
 193  */
 194 static inline void cpu_relax(void)
 195 {
 196         if (MACHINE_HAS_DIAG44)
 197                 asm volatile("diag 0,0,68");
 198         barrier();
 199 }
 200
 201 static inline void psw_set_key(unsigned int key)
 202 {
 203         asm volatile("spka 0(%0)" : : "d" (key));
 204 }
 205
 206 /*
 207  * Set PSW to specified value.
 208  */
 209 static inline void __load_psw(psw_t psw)
 210 {
 211 #ifndef __s390x__
 212         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 213 #else
 214         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 215 #endif
 216 }
 217
 218 /*
 219  * Set PSW mask to specified value, while leaving the
 220  * PSW addr pointing to the next instruction.
 221  */
 222
 223 static inline void __load_psw_mask (unsigned long mask)
 224 {
 225         unsigned long addr;
 226         psw_t psw;
 227
 228         psw.mask = mask;
 229
 230 #ifndef __s390x__
 231         asm volatile(
 232                 "       basr    %0,0\n"
 233                 "0:     ahi     %0,1f-0b\n"
 234                 "       st      %0,4(%1)\n"
 235                 "       lpsw    0(%1)\n"
 236                 "1:"
 237                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 238 #else /* __s390x__ */
 239         asm volatile(
 240                 "       larl    %0,1f\n"
 241                 "       stg     %0,8(%1)\n"
 242                 "       lpswe   0(%1)\n"
 243                 "1:"
 244                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 245 #endif /* __s390x__ */
 246 }
 247
 248 /*
 249  * Function to stop a processor until an interruption occurred
 250  */
 251 static inline void enabled_wait(void)
 252 {
 253         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 254                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 255 }
 256
 257 /*
 258  * Function to drop a processor into disabled wait state
 259  */
 260
 261 static inline void disabled_wait(unsigned long code)
 262 {
 263         unsigned long ctl_buf;
 264         psw_t dw_psw;
 265
 266         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 267         dw_psw.addr = code;
 268         /*
 269          * Store status and then load disabled wait psw,
 270          * the processor is dead afterwards
 271          */
 272 #ifndef __s390x__
 273         asm volatile(
 274                 "       stctl   0,0,0(%2)\n"
 275                 "       ni      0(%2),0xef\n"   /* switch off protection */
 276                 "       lctl    0,0,0(%2)\n"
 277                 "       stpt    0xd8\n"         /* store timer */
 278                 "       stckc   0xe0\n"         /* store clock comparator */
 279                 "       stpx    0x108\n"        /* store prefix register */
 280                 "       stam    0,15,0x120\n"   /* store access registers */
 281                 "       std     0,0x160\n"      /* store f0 */
 282                 "       std     2,0x168\n"      /* store f2 */
 283                 "       std     4,0x170\n"      /* store f4 */
 284                 "       std     6,0x178\n"      /* store f6 */
 285                 "       stm     0,15,0x180\n"   /* store general registers */
 286                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 287                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 288                 "       lpsw    0(%1)"
 289                 : "=m" (ctl_buf)
 290                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 291 #else /* __s390x__ */
 292         asm volatile(
 293                 "       stctg   0,0,0(%2)\n"
 294                 "       ni      4(%2),0xef\n"   /* switch off protection */
 295                 "       lctlg   0,0,0(%2)\n"
 296                 "       lghi    1,0x1000\n"
 297                 "       stpt    0x328(1)\n"     /* store timer */
 298                 "       stckc   0x330(1)\n"     /* store clock comparator */
 299                 "       stpx    0x318(1)\n"     /* store prefix register */
 300                 "       stam    0,15,0x340(1)\n"/* store access registers */
 301                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 302                 "       std     0,0x200(1)\n"   /* store f0 */
 303                 "       std     1,0x208(1)\n"   /* store f1 */
 304                 "       std     2,0x210(1)\n"   /* store f2 */
 305                 "       std     3,0x218(1)\n"   /* store f3 */
 306                 "       std     4,0x220(1)\n"   /* store f4 */
 307                 "       std     5,0x228(1)\n"   /* store f5 */
 308                 "       std     6,0x230(1)\n"   /* store f6 */
 309                 "       std     7,0x238(1)\n"   /* store f7 */
 310                 "       std     8,0x240(1)\n"   /* store f8 */
 311                 "       std     9,0x248(1)\n"   /* store f9 */
 312                 "       std     10,0x250(1)\n"  /* store f10 */
 313                 "       std     11,0x258(1)\n"  /* store f11 */
 314                 "       std     12,0x260(1)\n"  /* store f12 */
 315                 "       std     13,0x268(1)\n"  /* store f13 */
 316                 "       std     14,0x270(1)\n"  /* store f14 */
 317                 "       std     15,0x278(1)\n"  /* store f15 */
 318                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 319                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 320                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 321                 "       lpswe   0(%1)"
 322                 : "=m" (ctl_buf)
 323                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
 324 #endif /* __s390x__ */
 325 }
 326
 327 /*
 328  * Basic Machine Check/Program Check Handler.
 329  */
 330
 331 extern void s390_base_mcck_handler(void);
 332 extern void s390_base_pgm_handler(void);
 333 extern void s390_base_ext_handler(void);
 334
 335 extern void (*s390_base_mcck_handler_fn)(void);
 336 extern void (*s390_base_pgm_handler_fn)(void);
 337 extern void (*s390_base_ext_handler_fn)(void);
 338
 339 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 340
 341 #endif
 342
 343 /*
 344  * Helper macro for exception table entries
 345  */
 346 #ifndef __s390x__
 347 #define EX_TABLE(_fault,_target)                        \
 348         ".section __ex_table,\"a\"\n"                   \
 349         "       .align 4\n"                             \
 350         "       .long  " #_fault "," #_target "\n"      \
 351         ".previous\n"
 352 #else
 353 #define EX_TABLE(_fault,_target)                        \
 354         ".section __ex_table,\"a\"\n"                   \
 355         "       .align 8\n"                             \
 356         "       .quad  " #_fault "," #_target "\n"      \
 357         ".previous\n"
 358 #endif
 359
 360 #endif                                 /* __ASM_S390_PROCESSOR_H           */