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         struct list_head list;
  88 };
  89
  90 typedef struct thread_struct thread_struct;
  91
  92 /*
  93  * Stack layout of a C stack frame.
  94  */
  95 #ifndef __PACK_STACK
  96 struct stack_frame {
  97         unsigned long back_chain;
  98         unsigned long empty1[5];
  99         unsigned long gprs[10];
 100         unsigned int  empty2[8];
 101 };
 102 #else
 103 struct stack_frame {
 104         unsigned long empty1[5];
 105         unsigned int  empty2[8];
 106         unsigned long gprs[10];
 107         unsigned long back_chain;
 108 };
 109 #endif
 110
 111 #define ARCH_MIN_TASKALIGN      8
 112
 113 #define INIT_THREAD {                                                   \
 114         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 115 }
 116
 117 /*
 118  * Do necessary setup to start up a new thread.
 119  */
 120 #define start_thread(regs, new_psw, new_stackp) do {            \
 121         set_fs(USER_DS);                                        \
 122         regs->psw.mask  = psw_user_bits;                        \
 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         set_fs(USER_DS);                                        \
 129         regs->psw.mask  = psw_user32_bits;                      \
 130         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 131         regs->gprs[15]  = new_stackp;                           \
 132         crst_table_downgrade(current->mm, 1UL << 31);           \
 133 } while (0)
 134
 135 /* Forward declaration, a strange C thing */
 136 struct task_struct;
 137 struct mm_struct;
 138 struct seq_file;
 139
 140 /* Free all resources held by a thread. */
 141 extern void release_thread(struct task_struct *);
 142 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 143
 144 /* Prepare to copy thread state - unlazy all lazy status */
 145 #define prepare_to_copy(tsk)    do { } while (0)
 146
 147 /*
 148  * Return saved PC of a blocked thread.
 149  */
 150 extern unsigned long thread_saved_pc(struct task_struct *t);
 151
 152 extern void show_code(struct pt_regs *regs);
 153
 154 unsigned long get_wchan(struct task_struct *p);
 155 #define task_pt_regs(tsk) ((struct pt_regs *) \
 156         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 157 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 158 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 159
 160 /*
 161  * Give up the time slice of the virtual PU.
 162  */
 163 static inline void cpu_relax(void)
 164 {
 165         if (MACHINE_HAS_DIAG44)
 166                 asm volatile("diag 0,0,68");
 167         barrier();
 168 }
 169
 170 static inline void psw_set_key(unsigned int key)
 171 {
 172         asm volatile("spka 0(%0)" : : "d" (key));
 173 }
 174
 175 /*
 176  * Set PSW to specified value.
 177  */
 178 static inline void __load_psw(psw_t psw)
 179 {
 180 #ifndef __s390x__
 181         asm volatile("lpsw  %0" : : "Q" (psw) : "cc");
 182 #else
 183         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 184 #endif
 185 }
 186
 187 /*
 188  * Set PSW mask to specified value, while leaving the
 189  * PSW addr pointing to the next instruction.
 190  */
 191
 192 static inline void __load_psw_mask (unsigned long mask)
 193 {
 194         unsigned long addr;
 195         psw_t psw;
 196
 197         psw.mask = mask;
 198
 199 #ifndef __s390x__
 200         asm volatile(
 201                 "       basr    %0,0\n"
 202                 "0:     ahi     %0,1f-0b\n"
 203                 "       st      %0,%O1+4(%R1)\n"
 204                 "       lpsw    %1\n"
 205                 "1:"
 206                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 207 #else /* __s390x__ */
 208         asm volatile(
 209                 "       larl    %0,1f\n"
 210                 "       stg     %0,%O1+8(%R1)\n"
 211                 "       lpswe   %1\n"
 212                 "1:"
 213                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 214 #endif /* __s390x__ */
 215 }
 216
 217 /*
 218  * Function to stop a processor until an interruption occurred
 219  */
 220 static inline void enabled_wait(void)
 221 {
 222         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 223                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 224 }
 225
 226 /*
 227  * Function to drop a processor into disabled wait state
 228  */
 229
 230 static inline void ATTRIB_NORET disabled_wait(unsigned long code)
 231 {
 232         unsigned long ctl_buf;
 233         psw_t dw_psw;
 234
 235         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 236         dw_psw.addr = code;
 237         /*
 238          * Store status and then load disabled wait psw,
 239          * the processor is dead afterwards
 240          */
 241 #ifndef __s390x__
 242         asm volatile(
 243                 "       stctl   0,0,0(%2)\n"
 244                 "       ni      0(%2),0xef\n"   /* switch off protection */
 245                 "       lctl    0,0,0(%2)\n"
 246                 "       stpt    0xd8\n"         /* store timer */
 247                 "       stckc   0xe0\n"         /* store clock comparator */
 248                 "       stpx    0x108\n"        /* store prefix register */
 249                 "       stam    0,15,0x120\n"   /* store access registers */
 250                 "       std     0,0x160\n"      /* store f0 */
 251                 "       std     2,0x168\n"      /* store f2 */
 252                 "       std     4,0x170\n"      /* store f4 */
 253                 "       std     6,0x178\n"      /* store f6 */
 254                 "       stm     0,15,0x180\n"   /* store general registers */
 255                 "       stctl   0,15,0x1c0\n"   /* store control registers */
 256                 "       oi      0x1c0,0x10\n"   /* fake protection bit */
 257                 "       lpsw    0(%1)"
 258                 : "=m" (ctl_buf)
 259                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
 260 #else /* __s390x__ */
 261         asm volatile(
 262                 "       stctg   0,0,0(%2)\n"
 263                 "       ni      4(%2),0xef\n"   /* switch off protection */
 264                 "       lctlg   0,0,0(%2)\n"
 265                 "       lghi    1,0x1000\n"
 266                 "       stpt    0x328(1)\n"     /* store timer */
 267                 "       stckc   0x330(1)\n"     /* store clock comparator */
 268                 "       stpx    0x318(1)\n"     /* store prefix register */
 269                 "       stam    0,15,0x340(1)\n"/* store access registers */
 270                 "       stfpc   0x31c(1)\n"     /* store fpu control */
 271                 "       std     0,0x200(1)\n"   /* store f0 */
 272                 "       std     1,0x208(1)\n"   /* store f1 */
 273                 "       std     2,0x210(1)\n"   /* store f2 */
 274                 "       std     3,0x218(1)\n"   /* store f3 */
 275                 "       std     4,0x220(1)\n"   /* store f4 */
 276                 "       std     5,0x228(1)\n"   /* store f5 */
 277                 "       std     6,0x230(1)\n"   /* store f6 */
 278                 "       std     7,0x238(1)\n"   /* store f7 */
 279                 "       std     8,0x240(1)\n"   /* store f8 */
 280                 "       std     9,0x248(1)\n"   /* store f9 */
 281                 "       std     10,0x250(1)\n"  /* store f10 */
 282                 "       std     11,0x258(1)\n"  /* store f11 */
 283                 "       std     12,0x260(1)\n"  /* store f12 */
 284                 "       std     13,0x268(1)\n"  /* store f13 */
 285                 "       std     14,0x270(1)\n"  /* store f14 */
 286                 "       std     15,0x278(1)\n"  /* store f15 */
 287                 "       stmg    0,15,0x280(1)\n"/* store general registers */
 288                 "       stctg   0,15,0x380(1)\n"/* store control registers */
 289                 "       oi      0x384(1),0x10\n"/* fake protection bit */
 290                 "       lpswe   0(%1)"
 291                 : "=m" (ctl_buf)
 292                 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
 293 #endif /* __s390x__ */
 294         while (1);
 295 }
 296
 297 /*
 298  * Basic Machine Check/Program Check Handler.
 299  */
 300
 301 extern void s390_base_mcck_handler(void);
 302 extern void s390_base_pgm_handler(void);
 303 extern void s390_base_ext_handler(void);
 304
 305 extern void (*s390_base_mcck_handler_fn)(void);
 306 extern void (*s390_base_pgm_handler_fn)(void);
 307 extern void (*s390_base_ext_handler_fn)(void);
 308
 309 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 310
 311 #endif
 312
 313 /*
 314  * Helper macro for exception table entries
 315  */
 316 #ifndef __s390x__
 317 #define EX_TABLE(_fault,_target)                        \
 318         ".section __ex_table,\"a\"\n"                   \
 319         "       .align 4\n"                             \
 320         "       .long  " #_fault "," #_target "\n"      \
 321         ".previous\n"
 322 #else
 323 #define EX_TABLE(_fault,_target)                        \
 324         ".section __ex_table,\"a\"\n"                   \
 325         "       .align 8\n"                             \
 326         "       .quad  " #_fault "," #_target "\n"      \
 327         ".previous\n"
 328 #endif
 329
 330 #endif                                 /* __ASM_S390_PROCESSOR_H           */