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/cpu.h>
  18 #include <asm/page.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/setup.h>
  21
  22 #ifdef __KERNEL__
  23 /*
  24  * Default implementation of macro that returns current
  25  * instruction pointer ("program counter").
  26  */
  27 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
  28
  29 static inline void get_cpu_id(struct cpuid *ptr)
  30 {
  31         asm volatile("stidp %0" : "=Q" (*ptr));
  32 }
  33
  34 extern void s390_adjust_jiffies(void);
  35 extern int get_cpu_capability(unsigned int *);
  36 extern const struct seq_operations cpuinfo_op;
  37 extern int sysctl_ieee_emulation_warnings;
  38
  39 /*
  40  * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  41  */
  42 #ifndef __s390x__
  43
  44 #define TASK_SIZE               (1UL << 31)
  45 #define TASK_UNMAPPED_BASE      (1UL << 30)
  46
  47 #else /* __s390x__ */
  48
  49 #define TASK_SIZE_OF(tsk)       ((tsk)->mm->context.asce_limit)
  50 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  51                                         (1UL << 30) : (1UL << 41))
  52 #define TASK_SIZE               TASK_SIZE_OF(current)
  53
  54 #endif /* __s390x__ */
  55
  56 #ifdef __KERNEL__
  57
  58 #ifndef __s390x__
  59 #define STACK_TOP               (1UL << 31)
  60 #define STACK_TOP_MAX           (1UL << 31)
  61 #else /* __s390x__ */
  62 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
  63 #define STACK_TOP_MAX           (1UL << 42)
  64 #endif /* __s390x__ */
  65
  66
  67 #endif
  68
  69 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  70
  71 typedef struct {
  72         __u32 ar4;
  73 } mm_segment_t;
  74
  75 /*
  76  * Thread structure
  77  */
  78 struct thread_struct {
  79         s390_fp_regs fp_regs;
  80         unsigned int  acrs[NUM_ACRS];
  81         unsigned long ksp;              /* kernel stack pointer             */
  82         mm_segment_t mm_segment;
  83         unsigned long gmap_addr;        /* address of last gmap fault. */
  84         struct per_regs per_user;       /* User specified PER registers */
  85         struct per_event per_event;     /* Cause of the last PER trap */
  86         /* pfault_wait is used to block the process on a pfault event */
  87         unsigned long pfault_wait;
  88         struct list_head list;
  89 };
  90
  91 typedef struct thread_struct thread_struct;
  92
  93 /*
  94  * Stack layout of a C stack frame.
  95  */
  96 #ifndef __PACK_STACK
  97 struct stack_frame {
  98         unsigned long back_chain;
  99         unsigned long empty1[5];
 100         unsigned long gprs[10];
 101         unsigned int  empty2[8];
 102 };
 103 #else
 104 struct stack_frame {
 105         unsigned long empty1[5];
 106         unsigned int  empty2[8];
 107         unsigned long gprs[10];
 108         unsigned long back_chain;
 109 };
 110 #endif
 111
 112 #define ARCH_MIN_TASKALIGN      8
 113
 114 #define INIT_THREAD {                                                   \
 115         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 116 }
 117
 118 /*
 119  * Do necessary setup to start up a new thread.
 120  */
 121 #define start_thread(regs, new_psw, new_stackp) do {                    \
 122         regs->psw.mask  = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA;    \
 123         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;                     \
 124         regs->gprs[15]  = new_stackp;                                   \
 125 } while (0)
 126
 127 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 128         regs->psw.mask  = psw_user_bits | PSW_MASK_BA;                  \
 129         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;                     \
 130         regs->gprs[15]  = new_stackp;                                   \
 131         crst_table_downgrade(current->mm, 1UL << 31);                   \
 132 } while (0)
 133
 134 /* Forward declaration, a strange C thing */
 135 struct task_struct;
 136 struct mm_struct;
 137 struct seq_file;
 138
 139 /* Free all resources held by a thread. */
 140 extern void release_thread(struct task_struct *);
 141 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 142
 143 /* Prepare to copy thread state - unlazy all lazy status */
 144 #define prepare_to_copy(tsk)    do { } while (0)
 145
 146 /*
 147  * Return saved PC of a blocked thread.
 148  */
 149 extern unsigned long thread_saved_pc(struct task_struct *t);
 150
 151 extern void show_code(struct pt_regs *regs);
 152
 153 unsigned long get_wchan(struct task_struct *p);
 154 #define task_pt_regs(tsk) ((struct pt_regs *) \
 155         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 156 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 157 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 158
 159 /*
 160  * Give up the time slice of the virtual PU.
 161  */
 162 static inline void cpu_relax(void)
 163 {
 164         if (MACHINE_HAS_DIAG44)
 165                 asm volatile("diag 0,0,68");
 166         barrier();
 167 }
 168
 169 static inline void psw_set_key(unsigned int key)
 170 {
 171         asm volatile("spka 0(%0)" : : "d" (key));
 172 }
 173
 174 /*
 175  * Set PSW to specified value.
 176  */
 177 static inline void __load_psw(psw_t psw)
 178 {
 179 #ifndef __s390x__
 180         asm volatile("lpsw  %0" : : "Q" (psw) : "cc");
 181 #else
 182         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 183 #endif
 184 }
 185
 186 /*
 187  * Set PSW mask to specified value, while leaving the
 188  * PSW addr pointing to the next instruction.
 189  */
 190 static inline void __load_psw_mask (unsigned long mask)
 191 {
 192         unsigned long addr;
 193         psw_t psw;
 194
 195         psw.mask = mask;
 196
 197 #ifndef __s390x__
 198         asm volatile(
 199                 "       basr    %0,0\n"
 200                 "0:     ahi     %0,1f-0b\n"
 201                 "       st      %0,%O1+4(%R1)\n"
 202                 "       lpsw    %1\n"
 203                 "1:"
 204                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 205 #else /* __s390x__ */
 206         asm volatile(
 207                 "       larl    %0,1f\n"
 208                 "       stg     %0,%O1+8(%R1)\n"
 209                 "       lpswe   %1\n"
 210                 "1:"
 211                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 212 #endif /* __s390x__ */
 213 }
 214
 215 /*
 216  * Rewind PSW instruction address by specified number of bytes.
 217  */
 218 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 219 {
 220 #ifndef __s390x__
 221         if (psw.addr & PSW_ADDR_AMODE)
 222                 /* 31 bit mode */
 223                 return (psw.addr - ilc) | PSW_ADDR_AMODE;
 224         /* 24 bit mode */
 225         return (psw.addr - ilc) & ((1UL << 24) - 1);
 226 #else
 227         unsigned long mask;
 228
 229         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 230                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 231                                           (1UL << 24) - 1;
 232         return (psw.addr - ilc) & mask;
 233 #endif
 234 }
 235
 236 /*
 237  * Function to drop a processor into disabled wait state
 238  */
 239 static inline void __noreturn disabled_wait(unsigned long code)
 240 {
 241         unsigned long ctl_buf;
 242         psw_t dw_psw;
 243
 244         dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 245         dw_psw.addr = code;
 246         /*
 247          * Store status and then load disabled wait psw,
 248          * the processor is dead afterwards
 249          */
 250 #ifndef __s390x__
 251         asm volatile(
 252                 "       stctl   0,0,0(%2)\n"
 253                 "       ni      0(%2),0xef\n"   /* switch off protection */
 254                 "       lctl    0,0,0(%2)\n"
 255                 "       stpt    0xd8\n"         /* store timer */
 256                 "       stckc   0xe0\n"         /* store clock comparator */
 257                 "       stpx    0x108\n"        /* store prefix register */
 258                 "       stam    0,15,0x120\n"   /* store access registers */
 259                 "       std     0,0x160\n"      /* store f0 */
 260                 "       std     2,0x168\n"      /* store f2 */
 261                 "       std     4,0x170\n"      /* store f4 */
 262                 "       std     6,0x178\n"      /* store f6 */
 263                 "       stm     0,15,0x180\n"   /* store general registers */
 264                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 265                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 266                 "       lpsw    0(%1)"
 267                 : "=m" (ctl_buf)
 268                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 269 #else /* __s390x__ */
 270         asm volatile(
 271                 "       stctg   0,0,0(%2)\n"
 272                 "       ni      4(%2),0xef\n"   /* switch off protection */
 273                 "       lctlg   0,0,0(%2)\n"
 274                 "       lghi    1,0x1000\n"
 275                 "       stpt    0x328(1)\n"     /* store timer */
 276                 "       stckc   0x330(1)\n"     /* store clock comparator */
 277                 "       stpx    0x318(1)\n"     /* store prefix register */
 278                 "       stam    0,15,0x340(1)\n"/* store access registers */
 279                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 280                 "       std     0,0x200(1)\n"   /* store f0 */
 281                 "       std     1,0x208(1)\n"   /* store f1 */
 282                 "       std     2,0x210(1)\n"   /* store f2 */
 283                 "       std     3,0x218(1)\n"   /* store f3 */
 284                 "       std     4,0x220(1)\n"   /* store f4 */
 285                 "       std     5,0x228(1)\n"   /* store f5 */
 286                 "       std     6,0x230(1)\n"   /* store f6 */
 287                 "       std     7,0x238(1)\n"   /* store f7 */
 288                 "       std     8,0x240(1)\n"   /* store f8 */
 289                 "       std     9,0x248(1)\n"   /* store f9 */
 290                 "       std     10,0x250(1)\n"  /* store f10 */
 291                 "       std     11,0x258(1)\n"  /* store f11 */
 292                 "       std     12,0x260(1)\n"  /* store f12 */
 293                 "       std     13,0x268(1)\n"  /* store f13 */
 294                 "       std     14,0x270(1)\n"  /* store f14 */
 295                 "       std     15,0x278(1)\n"  /* store f15 */
 296                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 297                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 298                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 299                 "       lpswe   0(%1)"
 300                 : "=m" (ctl_buf)
 301                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
 302 #endif /* __s390x__ */
 303         while (1);
 304 }
 305
 306 /*
 307  * Basic Machine Check/Program Check Handler.
 308  */
 309
 310 extern void s390_base_mcck_handler(void);
 311 extern void s390_base_pgm_handler(void);
 312 extern void s390_base_ext_handler(void);
 313
 314 extern void (*s390_base_mcck_handler_fn)(void);
 315 extern void (*s390_base_pgm_handler_fn)(void);
 316 extern void (*s390_base_ext_handler_fn)(void);
 317
 318 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 319
 320 #endif
 321
 322 /*
 323  * Helper macro for exception table entries
 324  */
 325 #ifndef __s390x__
 326 #define EX_TABLE(_fault,_target)                        \
 327         ".section __ex_table,\"a\"\n"                   \
 328         "       .align 4\n"                             \
 329         "       .long  " #_fault "," #_target "\n"      \
 330         ".previous\n"
 331 #else
 332 #define EX_TABLE(_fault,_target)                        \
 333         ".section __ex_table,\"a\"\n"                   \
 334         "       .align 8\n"                             \
 335         "       .quad  " #_fault "," #_target "\n"      \
 336         ".previous\n"
 337 #endif
 338
 339 #endif                                 /* __ASM_S390_PROCESSOR_H           */