include/asm-s390/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/page.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 struct cpuinfo_S390
  41 {
  42         cpuid_t  cpu_id;
  43         __u16    cpu_addr;
  44         __u16    cpu_nr;
  45         unsigned long loops_per_jiffy;
  46         unsigned long *pgd_quick;
  47 #ifdef __s390x__
  48         unsigned long *pmd_quick;
  49 #endif /* __s390x__ */
  50         unsigned long *pte_quick;
  51         unsigned long pgtable_cache_sz;
  52 };
  53
  54 extern void print_cpu_info(struct cpuinfo_S390 *);
  55
  56 /* Lazy FPU handling on uni-processor */
  57 extern struct task_struct *last_task_used_math;
  58
  59 /*
  60  * User space process size: 2GB for 31 bit, 4TB for 64 bit.
  61  */
  62 #ifndef __s390x__
  63
  64 # define TASK_SIZE              (0x80000000UL)
  65 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  66 # define DEFAULT_TASK_SIZE      (0x80000000UL)
  67
  68 #else /* __s390x__ */
  69
  70 # define TASK_SIZE              (test_thread_flag(TIF_31BIT) ? \
  71                                         (0x80000000UL) : (0x40000000000UL))
  72 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 2)
  73 # define DEFAULT_TASK_SIZE      (0x40000000000UL)
  74
  75 #endif /* __s390x__ */
  76
  77 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  78
  79 typedef struct {
  80         __u32 ar4;
  81 } mm_segment_t;
  82
  83 /*
  84  * Thread structure
  85  */
  86 struct thread_struct {
  87         s390_fp_regs fp_regs;
  88         unsigned int  acrs[NUM_ACRS];
  89         unsigned long ksp;              /* kernel stack pointer             */
  90         unsigned long user_seg;         /* HSTD                             */
  91         mm_segment_t mm_segment;
  92         unsigned long prot_addr;        /* address of protection-excep.     */
  93         unsigned int error_code;        /* error-code of last prog-excep.   */
  94         unsigned int trap_no;
  95         per_struct per_info;
  96         /* Used to give failing instruction back to user for ieee exceptions */
  97         unsigned long ieee_instruction_pointer;
  98         /* pfault_wait is used to block the process on a pfault event */
  99         unsigned long pfault_wait;
 100 };
 101
 102 typedef struct thread_struct thread_struct;
 103
 104 /*
 105  * Stack layout of a C stack frame.
 106  */
 107 #ifndef __PACK_STACK
 108 struct stack_frame {
 109         unsigned long back_chain;
 110         unsigned long empty1[5];
 111         unsigned long gprs[10];
 112         unsigned int  empty2[8];
 113 };
 114 #else
 115 struct stack_frame {
 116         unsigned long empty1[5];
 117         unsigned int  empty2[8];
 118         unsigned long gprs[10];
 119         unsigned long back_chain;
 120 };
 121 #endif
 122
 123 #define ARCH_MIN_TASKALIGN      8
 124
 125 #ifndef __s390x__
 126 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
 127 #else /* __s390x__ */
 128 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
 129 #endif /* __s390x__ */
 130
 131 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0},              \
 132                             {0},{0},{0},{0},{0},{0}}},                         \
 133                      {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},         \
 134                      sizeof(init_stack) + (unsigned long) &init_stack,         \
 135                      __SWAPPER_PG_DIR,                                         \
 136                      {0},                                                      \
 137                      0,0,0,                                                    \
 138                      (per_struct) {{{{0,}}},0,0,0,0,{{0,}}},                   \
 139                      0, 0                                                      \
 140 }
 141
 142 /*
 143  * Do necessary setup to start up a new thread.
 144  */
 145 #ifndef __s390x__
 146
 147 #define start_thread(regs, new_psw, new_stackp) do {            \
 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 #else /* __s390x__ */
 154
 155 #define start_thread(regs, new_psw, new_stackp) do {            \
 156         regs->psw.mask  = PSW_USER_BITS;                        \
 157         regs->psw.addr  = new_psw;                              \
 158         regs->gprs[15]  = new_stackp;                           \
 159 } while (0)
 160
 161 #define start_thread31(regs, new_psw, new_stackp) do {          \
 162         regs->psw.mask  = PSW_USER32_BITS;                      \
 163         regs->psw.addr  = new_psw;                              \
 164         regs->gprs[15]  = new_stackp;                           \
 165 } while (0)
 166
 167 #endif /* __s390x__ */
 168
 169 /* Forward declaration, a strange C thing */
 170 struct task_struct;
 171 struct mm_struct;
 172
 173 /* Free all resources held by a thread. */
 174 extern void release_thread(struct task_struct *);
 175 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 176
 177 /* Prepare to copy thread state - unlazy all lazy status */
 178 #define prepare_to_copy(tsk)    do { } while (0)
 179
 180 /*
 181  * Return saved PC of a blocked thread.
 182  */
 183 extern unsigned long thread_saved_pc(struct task_struct *t);
 184
 185 /*
 186  * Print register of task into buffer. Used in fs/proc/array.c.
 187  */
 188 extern char *task_show_regs(struct task_struct *task, char *buffer);
 189
 190 extern void show_registers(struct pt_regs *regs);
 191 extern void show_trace(struct task_struct *task, unsigned long *sp);
 192
 193 unsigned long get_wchan(struct task_struct *p);
 194 #define task_pt_regs(tsk) ((struct pt_regs *) \
 195         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 196 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 197 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 198
 199 /*
 200  * Give up the time slice of the virtual PU.
 201  */
 202 static inline void cpu_relax(void)
 203 {
 204         if (MACHINE_HAS_DIAG44)
 205                 asm volatile ("diag 0,0,68" : : : "memory");
 206         else
 207                 barrier();
 208 }
 209
 210 /*
 211  * Set PSW to specified value.
 212  */
 213 static inline void __load_psw(psw_t psw)
 214 {
 215 #ifndef __s390x__
 216         asm volatile ("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
 217 #else
 218         asm volatile ("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
 219 #endif
 220 }
 221
 222 /*
 223  * Set PSW mask to specified value, while leaving the
 224  * PSW addr pointing to the next instruction.
 225  */
 226
 227 static inline void __load_psw_mask (unsigned long mask)
 228 {
 229         unsigned long addr;
 230         psw_t psw;
 231
 232         psw.mask = mask;
 233
 234 #ifndef __s390x__
 235         asm volatile (
 236                 "    basr %0,0\n"
 237                 "0:  ahi  %0,1f-0b\n"
 238                 "    st   %0,4(%1)\n"
 239                 "    lpsw 0(%1)\n"
 240                 "1:"
 241                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
 242 #else /* __s390x__ */
 243         asm volatile (
 244                 "    larl  %0,1f\n"
 245                 "    stg   %0,8(%1)\n"
 246                 "    lpswe 0(%1)\n"
 247                 "1:"
 248                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
 249 #endif /* __s390x__ */
 250 }
 251
 252 /*
 253  * Function to stop a processor until an interruption occurred
 254  */
 255 static inline void enabled_wait(void)
 256 {
 257         __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 258                         PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
 259 }
 260
 261 /*
 262  * Function to drop a processor into disabled wait state
 263  */
 264
 265 static inline void disabled_wait(unsigned long code)
 266 {
 267         unsigned long ctl_buf;
 268         psw_t dw_psw;
 269
 270         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 271         dw_psw.addr = code;
 272         /*
 273          * Store status and then load disabled wait psw,
 274          * the processor is dead afterwards
 275          */
 276 #ifndef __s390x__
 277         asm volatile ("    stctl 0,0,0(%2)\n"
 278                       "    ni    0(%2),0xef\n" /* switch off protection */
 279                       "    lctl  0,0,0(%2)\n"
 280                       "    stpt  0xd8\n"       /* store timer */
 281                       "    stckc 0xe0\n"       /* store clock comparator */
 282                       "    stpx  0x108\n"      /* store prefix register */
 283                       "    stam  0,15,0x120\n" /* store access registers */
 284                       "    std   0,0x160\n"    /* store f0 */
 285                       "    std   2,0x168\n"    /* store f2 */
 286                       "    std   4,0x170\n"    /* store f4 */
 287                       "    std   6,0x178\n"    /* store f6 */
 288                       "    stm   0,15,0x180\n" /* store general registers */
 289                       "    stctl 0,15,0x1c0\n" /* store control registers */
 290                       "    oi    0x1c0,0x10\n" /* fake protection bit */
 291                       "    lpsw 0(%1)"
 292                       : "=m" (ctl_buf)
 293                       : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
 294 #else /* __s390x__ */
 295         asm volatile ("    stctg 0,0,0(%2)\n"
 296                       "    ni    4(%2),0xef\n" /* switch off protection */
 297                       "    lctlg 0,0,0(%2)\n"
 298                       "    lghi  1,0x1000\n"
 299                       "    stpt  0x328(1)\n"      /* store timer */
 300                       "    stckc 0x330(1)\n"      /* store clock comparator */
 301                       "    stpx  0x318(1)\n"      /* store prefix register */
 302                       "    stam  0,15,0x340(1)\n" /* store access registers */
 303                       "    stfpc 0x31c(1)\n"      /* store fpu control */
 304                       "    std   0,0x200(1)\n"    /* store f0 */
 305                       "    std   1,0x208(1)\n"    /* store f1 */
 306                       "    std   2,0x210(1)\n"    /* store f2 */
 307                       "    std   3,0x218(1)\n"    /* store f3 */
 308                       "    std   4,0x220(1)\n"    /* store f4 */
 309                       "    std   5,0x228(1)\n"    /* store f5 */
 310                       "    std   6,0x230(1)\n"    /* store f6 */
 311                       "    std   7,0x238(1)\n"    /* store f7 */
 312                       "    std   8,0x240(1)\n"    /* store f8 */
 313                       "    std   9,0x248(1)\n"    /* store f9 */
 314                       "    std   10,0x250(1)\n"   /* store f10 */
 315                       "    std   11,0x258(1)\n"   /* store f11 */
 316                       "    std   12,0x260(1)\n"   /* store f12 */
 317                       "    std   13,0x268(1)\n"   /* store f13 */
 318                       "    std   14,0x270(1)\n"   /* store f14 */
 319                       "    std   15,0x278(1)\n"   /* store f15 */
 320                       "    stmg  0,15,0x280(1)\n" /* store general registers */
 321                       "    stctg 0,15,0x380(1)\n" /* store control registers */
 322                       "    oi    0x384(1),0x10\n" /* fake protection bit */
 323                       "    lpswe 0(%1)"
 324                       : "=m" (ctl_buf)
 325                       : "a" (&dw_psw), "a" (&ctl_buf),
 326                         "m" (dw_psw) : "cc", "0", "1");
 327 #endif /* __s390x__ */
 328 }
 329
 330 /*
 331  * CPU idle notifier chain.
 332  */
 333 #define CPU_IDLE        0
 334 #define CPU_NOT_IDLE    1
 335
 336 struct notifier_block;
 337 int register_idle_notifier(struct notifier_block *nb);
 338 int unregister_idle_notifier(struct notifier_block *nb);
 339
 340 #endif
 341
 342 #endif                                 /* __ASM_S390_PROCESSOR_H           */