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
  37 /*
  38  * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  39  */
  40 #ifndef __s390x__
  41
  42 #define TASK_SIZE               (1UL << 31)
  43 #define TASK_UNMAPPED_BASE      (1UL << 30)
  44
  45 #else /* __s390x__ */
  46
  47 #define TASK_SIZE_OF(tsk)       ((tsk)->mm->context.asce_limit)
  48 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  49                                         (1UL << 30) : (1UL << 41))
  50 #define TASK_SIZE               TASK_SIZE_OF(current)
  51
  52 #endif /* __s390x__ */
  53
  54 #ifdef __KERNEL__
  55
  56 #ifndef __s390x__
  57 #define STACK_TOP               (1UL << 31)
  58 #define STACK_TOP_MAX           (1UL << 31)
  59 #else /* __s390x__ */
  60 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
  61 #define STACK_TOP_MAX           (1UL << 42)
  62 #endif /* __s390x__ */
  63
  64
  65 #endif
  66
  67 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  68
  69 typedef struct {
  70         __u32 ar4;
  71 } mm_segment_t;
  72
  73 /*
  74  * Thread structure
  75  */
  76 struct thread_struct {
  77         s390_fp_regs fp_regs;
  78         unsigned int  acrs[NUM_ACRS];
  79         unsigned long ksp;              /* kernel stack pointer             */
  80         mm_segment_t mm_segment;
  81         unsigned long prot_addr;        /* address of protection-excep.     */
  82         unsigned int trap_no;
  83         struct per_regs per_user;       /* User specified PER registers */
  84         struct per_event per_event;     /* Cause of the last PER trap */
  85         /* pfault_wait is used to block the process on a pfault event */
  86         unsigned long pfault_wait;
  87 };
  88
  89 typedef struct thread_struct thread_struct;
  90
  91 /*
  92  * Stack layout of a C stack frame.
  93  */
  94 #ifndef __PACK_STACK
  95 struct stack_frame {
  96         unsigned long back_chain;
  97         unsigned long empty1[5];
  98         unsigned long gprs[10];
  99         unsigned int  empty2[8];
 100 };
 101 #else
 102 struct stack_frame {
 103         unsigned long empty1[5];
 104         unsigned int  empty2[8];
 105         unsigned long gprs[10];
 106         unsigned long back_chain;
 107 };
 108 #endif
 109
 110 #define ARCH_MIN_TASKALIGN      8
 111
 112 #define INIT_THREAD {                                                   \
 113         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 114 }
 115
 116 /*
 117  * Do necessary setup to start up a new thread.
 118  */
 119 #define start_thread(regs, new_psw, new_stackp) do {            \
 120         set_fs(USER_DS);                                        \
 121         regs->psw.mask  = psw_user_bits;                        \
 122         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 123         regs->gprs[15]  = new_stackp;                           \
 124 } while (0)
 125
 126 #define start_thread31(regs, new_psw, new_stackp) do {          \
 127         set_fs(USER_DS);                                        \
 128         regs->psw.mask  = psw_user32_bits;                      \
 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 /*
 152  * Print register of task into buffer. Used in fs/proc/array.c.
 153  */
 154 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
 155
 156 extern void show_code(struct pt_regs *regs);
 157
 158 unsigned long get_wchan(struct task_struct *p);
 159 #define task_pt_regs(tsk) ((struct pt_regs *) \
 160         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 161 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 162 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 163
 164 /*
 165  * Give up the time slice of the virtual PU.
 166  */
 167 static inline void cpu_relax(void)
 168 {
 169         if (MACHINE_HAS_DIAG44)
 170                 asm volatile("diag 0,0,68");
 171         barrier();
 172 }
 173
 174 static inline void psw_set_key(unsigned int key)
 175 {
 176         asm volatile("spka 0(%0)" : : "d" (key));
 177 }
 178
 179 /*
 180  * Set PSW to specified value.
 181  */
 182 static inline void __load_psw(psw_t psw)
 183 {
 184 #ifndef __s390x__
 185         asm volatile("lpsw  %0" : : "Q" (psw) : "cc");
 186 #else
 187         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 188 #endif
 189 }
 190
 191 /*
 192  * Set PSW mask to specified value, while leaving the
 193  * PSW addr pointing to the next instruction.
 194  */
 195
 196 static inline void __load_psw_mask (unsigned long mask)
 197 {
 198         unsigned long addr;
 199         psw_t psw;
 200
 201         psw.mask = mask;
 202
 203 #ifndef __s390x__
 204         asm volatile(
 205                 "       basr    %0,0\n"
 206                 "0:     ahi     %0,1f-0b\n"
 207                 "       st      %0,%O1+4(%R1)\n"
 208                 "       lpsw    %1\n"
 209                 "1:"
 210                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 211 #else /* __s390x__ */
 212         asm volatile(
 213                 "       larl    %0,1f\n"
 214                 "       stg     %0,%O1+8(%R1)\n"
 215                 "       lpswe   %1\n"
 216                 "1:"
 217                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 218 #endif /* __s390x__ */
 219 }
 220
 221 /*
 222  * Function to stop a processor until an interruption occurred
 223  */
 224 static inline void enabled_wait(void)
 225 {
 226         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 227                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 228 }
 229
 230 /*
 231  * Function to drop a processor into disabled wait state
 232  */
 233
 234 static inline void ATTRIB_NORET disabled_wait(unsigned long code)
 235 {
 236         unsigned long ctl_buf;
 237         psw_t dw_psw;
 238
 239         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 240         dw_psw.addr = code;
 241         /*
 242          * Store status and then load disabled wait psw,
 243          * the processor is dead afterwards
 244          */
 245 #ifndef __s390x__
 246         asm volatile(
 247                 "       stctl   0,0,0(%2)\n"
 248                 "       ni      0(%2),0xef\n"   /* switch off protection */
 249                 "       lctl    0,0,0(%2)\n"
 250                 "       stpt    0xd8\n"         /* store timer */
 251                 "       stckc   0xe0\n"         /* store clock comparator */
 252                 "       stpx    0x108\n"        /* store prefix register */
 253                 "       stam    0,15,0x120\n"   /* store access registers */
 254                 "       std     0,0x160\n"      /* store f0 */
 255                 "       std     2,0x168\n"      /* store f2 */
 256                 "       std     4,0x170\n"      /* store f4 */
 257                 "       std     6,0x178\n"      /* store f6 */
 258                 "       stm     0,15,0x180\n"   /* store general registers */
 259                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 260                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 261                 "       lpsw    0(%1)"
 262                 : "=m" (ctl_buf)
 263                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 264 #else /* __s390x__ */
 265         asm volatile(
 266                 "       stctg   0,0,0(%2)\n"
 267                 "       ni      4(%2),0xef\n"   /* switch off protection */
 268                 "       lctlg   0,0,0(%2)\n"
 269                 "       lghi    1,0x1000\n"
 270                 "       stpt    0x328(1)\n"     /* store timer */
 271                 "       stckc   0x330(1)\n"     /* store clock comparator */
 272                 "       stpx    0x318(1)\n"     /* store prefix register */
 273                 "       stam    0,15,0x340(1)\n"/* store access registers */
 274                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 275                 "       std     0,0x200(1)\n"   /* store f0 */
 276                 "       std     1,0x208(1)\n"   /* store f1 */
 277                 "       std     2,0x210(1)\n"   /* store f2 */
 278                 "       std     3,0x218(1)\n"   /* store f3 */
 279                 "       std     4,0x220(1)\n"   /* store f4 */
 280                 "       std     5,0x228(1)\n"   /* store f5 */
 281                 "       std     6,0x230(1)\n"   /* store f6 */
 282                 "       std     7,0x238(1)\n"   /* store f7 */
 283                 "       std     8,0x240(1)\n"   /* store f8 */
 284                 "       std     9,0x248(1)\n"   /* store f9 */
 285                 "       std     10,0x250(1)\n"  /* store f10 */
 286                 "       std     11,0x258(1)\n"  /* store f11 */
 287                 "       std     12,0x260(1)\n"  /* store f12 */
 288                 "       std     13,0x268(1)\n"  /* store f13 */
 289                 "       std     14,0x270(1)\n"  /* store f14 */
 290                 "       std     15,0x278(1)\n"  /* store f15 */
 291                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 292                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 293                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 294                 "       lpswe   0(%1)"
 295                 : "=m" (ctl_buf)
 296                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
 297 #endif /* __s390x__ */
 298         while (1);
 299 }
 300
 301 /*
 302  * Basic Machine Check/Program Check Handler.
 303  */
 304
 305 extern void s390_base_mcck_handler(void);
 306 extern void s390_base_pgm_handler(void);
 307 extern void s390_base_ext_handler(void);
 308
 309 extern void (*s390_base_mcck_handler_fn)(void);
 310 extern void (*s390_base_pgm_handler_fn)(void);
 311 extern void (*s390_base_ext_handler_fn)(void);
 312
 313 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 314
 315 #endif
 316
 317 /*
 318  * Helper macro for exception table entries
 319  */
 320 #ifndef __s390x__
 321 #define EX_TABLE(_fault,_target)                        \
 322         ".section __ex_table,\"a\"\n"                   \
 323         "       .align 4\n"                             \
 324         "       .long  " #_fault "," #_target "\n"      \
 325         ".previous\n"
 326 #else
 327 #define EX_TABLE(_fault,_target)                        \
 328         ".section __ex_table,\"a\"\n"                   \
 329         "       .align 8\n"                             \
 330         "       .quad  " #_fault "," #_target "\n"      \
 331         ".previous\n"
 332 #endif
 333
 334 #endif                                 /* __ASM_S390_PROCESSOR_H           */