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 MM_VM_SIZE(mm)          DEFAULT_TASK_SIZE
  78
  79 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  80
  81 typedef struct {
  82         __u32 ar4;
  83 } mm_segment_t;
  84
  85 /*
  86  * Thread structure
  87  */
  88 struct thread_struct {
  89         s390_fp_regs fp_regs;
  90         unsigned int  acrs[NUM_ACRS];
  91         unsigned long ksp;              /* kernel stack pointer             */
  92         unsigned long user_seg;         /* HSTD                             */
  93         mm_segment_t mm_segment;
  94         unsigned long prot_addr;        /* address of protection-excep.     */
  95         unsigned int error_code;        /* error-code of last prog-excep.   */
  96         unsigned int trap_no;
  97         per_struct per_info;
  98         /* Used to give failing instruction back to user for ieee exceptions */
  99         unsigned long ieee_instruction_pointer;
 100         /* pfault_wait is used to block the process on a pfault event */
 101         unsigned long pfault_wait;
 102 };
 103
 104 typedef struct thread_struct thread_struct;
 105
 106 /*
 107  * Stack layout of a C stack frame.
 108  */
 109 #ifndef __PACK_STACK
 110 struct stack_frame {
 111         unsigned long back_chain;
 112         unsigned long empty1[5];
 113         unsigned long gprs[10];
 114         unsigned int  empty2[8];
 115 };
 116 #else
 117 struct stack_frame {
 118         unsigned long empty1[5];
 119         unsigned int  empty2[8];
 120         unsigned long gprs[10];
 121         unsigned long back_chain;
 122 };
 123 #endif
 124
 125 #define ARCH_MIN_TASKALIGN      8
 126
 127 #ifndef __s390x__
 128 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
 129 #else /* __s390x__ */
 130 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
 131 #endif /* __s390x__ */
 132
 133 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0},              \
 134                             {0},{0},{0},{0},{0},{0}}},                         \
 135                      {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},         \
 136                      sizeof(init_stack) + (unsigned long) &init_stack,         \
 137                      __SWAPPER_PG_DIR,                                         \
 138                      {0},                                                      \
 139                      0,0,0,                                                    \
 140                      (per_struct) {{{{0,}}},0,0,0,0,{{0,}}},                   \
 141                      0, 0                                                      \
 142 }
 143
 144 /*
 145  * Do necessary setup to start up a new thread.
 146  */
 147 #ifndef __s390x__
 148
 149 #define start_thread(regs, new_psw, new_stackp) do {            \
 150         regs->psw.mask  = PSW_USER_BITS;                        \
 151         regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \
 152         regs->gprs[15]  = new_stackp ;                          \
 153 } while (0)
 154
 155 #else /* __s390x__ */
 156
 157 #define start_thread(regs, new_psw, new_stackp) do {            \
 158         regs->psw.mask  = PSW_USER_BITS;                        \
 159         regs->psw.addr  = new_psw;                              \
 160         regs->gprs[15]  = new_stackp;                           \
 161 } while (0)
 162
 163 #define start_thread31(regs, new_psw, new_stackp) do {          \
 164         regs->psw.mask  = PSW_USER32_BITS;                      \
 165         regs->psw.addr  = new_psw;                              \
 166         regs->gprs[15]  = new_stackp;                           \
 167 } while (0)
 168
 169 #endif /* __s390x__ */
 170
 171 /* Forward declaration, a strange C thing */
 172 struct task_struct;
 173 struct mm_struct;
 174
 175 /* Free all resources held by a thread. */
 176 extern void release_thread(struct task_struct *);
 177 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 178
 179 /* Prepare to copy thread state - unlazy all lazy status */
 180 #define prepare_to_copy(tsk)    do { } while (0)
 181
 182 /*
 183  * Return saved PC of a blocked thread.
 184  */
 185 extern unsigned long thread_saved_pc(struct task_struct *t);
 186
 187 /*
 188  * Print register of task into buffer. Used in fs/proc/array.c.
 189  */
 190 extern char *task_show_regs(struct task_struct *task, char *buffer);
 191
 192 extern void show_registers(struct pt_regs *regs);
 193 extern void show_trace(struct task_struct *task, unsigned long *sp);
 194
 195 unsigned long get_wchan(struct task_struct *p);
 196 #define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
 197         ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
 198 #define KSTK_EIP(tsk)   (__KSTK_PTREGS(tsk)->psw.addr)
 199 #define KSTK_ESP(tsk)   (__KSTK_PTREGS(tsk)->gprs[15])
 200
 201 /*
 202  * Give up the time slice of the virtual PU.
 203  */
 204 #ifndef __s390x__
 205 # define cpu_relax()    asm volatile ("diag 0,0,68" : : : "memory")
 206 #else /* __s390x__ */
 207 # define cpu_relax() \
 208         asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory")
 209 #endif /* __s390x__ */
 210
 211 /*
 212  * Set PSW mask to specified value, while leaving the
 213  * PSW addr pointing to the next instruction.
 214  */
 215
 216 static inline void __load_psw_mask (unsigned long mask)
 217 {
 218         unsigned long addr;
 219
 220         psw_t psw;
 221         psw.mask = mask;
 222
 223 #ifndef __s390x__
 224         asm volatile (
 225                 "    basr %0,0\n"
 226                 "0:  ahi  %0,1f-0b\n"
 227                 "    st   %0,4(%1)\n"
 228                 "    lpsw 0(%1)\n"
 229                 "1:"
 230                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
 231 #else /* __s390x__ */
 232         asm volatile (
 233                 "    larl  %0,1f\n"
 234                 "    stg   %0,8(%1)\n"
 235                 "    lpswe 0(%1)\n"
 236                 "1:"
 237                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
 238 #endif /* __s390x__ */
 239 }
 240
 241 /*
 242  * Function to stop a processor until an interruption occurred
 243  */
 244 static inline void enabled_wait(void)
 245 {
 246         unsigned long reg;
 247         psw_t wait_psw;
 248
 249         wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
 250                 PSW_MASK_MCHECK | PSW_MASK_WAIT;
 251 #ifndef __s390x__
 252         asm volatile (
 253                 "    basr %0,0\n"
 254                 "0:  la   %0,1f-0b(%0)\n"
 255                 "    st   %0,4(%1)\n"
 256                 "    oi   4(%1),0x80\n"
 257                 "    lpsw 0(%1)\n"
 258                 "1:"
 259                 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
 260                 : "memory", "cc" );
 261 #else /* __s390x__ */
 262         asm volatile (
 263                 "    larl  %0,0f\n"
 264                 "    stg   %0,8(%1)\n"
 265                 "    lpswe 0(%1)\n"
 266                 "0:"
 267                 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
 268                 : "memory", "cc" );
 269 #endif /* __s390x__ */
 270 }
 271
 272 /*
 273  * Function to drop a processor into disabled wait state
 274  */
 275
 276 static inline void disabled_wait(unsigned long code)
 277 {
 278         char psw_buffer[2*sizeof(psw_t)];
 279         unsigned long ctl_buf;
 280         psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
 281                                   & -sizeof(psw_t));
 282
 283         dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 284         dw_psw->addr = code;
 285         /*
 286          * Store status and then load disabled wait psw,
 287          * the processor is dead afterwards
 288          */
 289 #ifndef __s390x__
 290         asm volatile ("    stctl 0,0,0(%2)\n"
 291                       "    ni    0(%2),0xef\n" /* switch off protection */
 292                       "    lctl  0,0,0(%2)\n"
 293                       "    stpt  0xd8\n"       /* store timer */
 294                       "    stckc 0xe0\n"       /* store clock comparator */
 295                       "    stpx  0x108\n"      /* store prefix register */
 296                       "    stam  0,15,0x120\n" /* store access registers */
 297                       "    std   0,0x160\n"    /* store f0 */
 298                       "    std   2,0x168\n"    /* store f2 */
 299                       "    std   4,0x170\n"    /* store f4 */
 300                       "    std   6,0x178\n"    /* store f6 */
 301                       "    stm   0,15,0x180\n" /* store general registers */
 302                       "    stctl 0,15,0x1c0\n" /* store control registers */
 303                       "    oi    0x1c0,0x10\n" /* fake protection bit */
 304                       "    lpsw 0(%1)"
 305                       : "=m" (ctl_buf)
 306                       : "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
 307 #else /* __s390x__ */
 308         asm volatile ("    stctg 0,0,0(%2)\n"
 309                       "    ni    4(%2),0xef\n" /* switch off protection */
 310                       "    lctlg 0,0,0(%2)\n"
 311                       "    lghi  1,0x1000\n"
 312                       "    stpt  0x328(1)\n"      /* store timer */
 313                       "    stckc 0x330(1)\n"      /* store clock comparator */
 314                       "    stpx  0x318(1)\n"      /* store prefix register */
 315                       "    stam  0,15,0x340(1)\n" /* store access registers */
 316                       "    stfpc 0x31c(1)\n"      /* store fpu control */
 317                       "    std   0,0x200(1)\n"    /* store f0 */
 318                       "    std   1,0x208(1)\n"    /* store f1 */
 319                       "    std   2,0x210(1)\n"    /* store f2 */
 320                       "    std   3,0x218(1)\n"    /* store f3 */
 321                       "    std   4,0x220(1)\n"    /* store f4 */
 322                       "    std   5,0x228(1)\n"    /* store f5 */
 323                       "    std   6,0x230(1)\n"    /* store f6 */
 324                       "    std   7,0x238(1)\n"    /* store f7 */
 325                       "    std   8,0x240(1)\n"    /* store f8 */
 326                       "    std   9,0x248(1)\n"    /* store f9 */
 327                       "    std   10,0x250(1)\n"   /* store f10 */
 328                       "    std   11,0x258(1)\n"   /* store f11 */
 329                       "    std   12,0x260(1)\n"   /* store f12 */
 330                       "    std   13,0x268(1)\n"   /* store f13 */
 331                       "    std   14,0x270(1)\n"   /* store f14 */
 332                       "    std   15,0x278(1)\n"   /* store f15 */
 333                       "    stmg  0,15,0x280(1)\n" /* store general registers */
 334                       "    stctg 0,15,0x380(1)\n" /* store control registers */
 335                       "    oi    0x384(1),0x10\n" /* fake protection bit */
 336                       "    lpswe 0(%1)"
 337                       : "=m" (ctl_buf)
 338                       : "a" (dw_psw), "a" (&ctl_buf),
 339                         "m" (dw_psw) : "cc", "0", "1");
 340 #endif /* __s390x__ */
 341 }
 342
 343 /*
 344  * CPU idle notifier chain.
 345  */
 346 #define CPU_IDLE        0
 347 #define CPU_NOT_IDLE    1
 348
 349 struct notifier_block;
 350 int register_idle_notifier(struct notifier_block *nb);
 351 int unregister_idle_notifier(struct notifier_block *nb);
 352
 353 #endif
 354
 355 #endif                                 /* __ASM_S390_PROCESSOR_H           */