arch/s390/include/asm/processor.h

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  *  Derived from "include/asm-i386/processor.h"
   8  *    Copyright (C) 1994, Linus Torvalds
   9  */
  10
  11 #ifndef __ASM_S390_PROCESSOR_H
  12 #define __ASM_S390_PROCESSOR_H
  13
  14 #include <linux/const.h>
  15
  16 #define CIF_MCCK_PENDING        0       /* machine check handling is pending */
  17 #define CIF_ASCE                1       /* user asce needs fixup / uaccess */
  18 #define CIF_NOHZ_DELAY          2       /* delay HZ disable for a tick */
  19 #define CIF_FPU                 3       /* restore FPU registers */
  20 #define CIF_IGNORE_IRQ          4       /* ignore interrupt (for udelay) */
  21 #define CIF_ENABLED_WAIT        5       /* in enabled wait state */
  22
  23 #define _CIF_MCCK_PENDING       _BITUL(CIF_MCCK_PENDING)
  24 #define _CIF_ASCE               _BITUL(CIF_ASCE)
  25 #define _CIF_NOHZ_DELAY         _BITUL(CIF_NOHZ_DELAY)
  26 #define _CIF_FPU                _BITUL(CIF_FPU)
  27 #define _CIF_IGNORE_IRQ         _BITUL(CIF_IGNORE_IRQ)
  28 #define _CIF_ENABLED_WAIT       _BITUL(CIF_ENABLED_WAIT)
  29
  30 #ifndef __ASSEMBLY__
  31
  32 #include <linux/linkage.h>
  33 #include <linux/irqflags.h>
  34 #include <asm/cpu.h>
  35 #include <asm/page.h>
  36 #include <asm/ptrace.h>
  37 #include <asm/setup.h>
  38 #include <asm/runtime_instr.h>
  39 #include <asm/fpu/types.h>
  40 #include <asm/fpu/internal.h>
  41
  42 static inline void set_cpu_flag(int flag)
  43 {
  44         S390_lowcore.cpu_flags |= (1UL << flag);
  45 }
  46
  47 static inline void clear_cpu_flag(int flag)
  48 {
  49         S390_lowcore.cpu_flags &= ~(1UL << flag);
  50 }
  51
  52 static inline int test_cpu_flag(int flag)
  53 {
  54         return !!(S390_lowcore.cpu_flags & (1UL << flag));
  55 }
  56
  57 /*
  58  * Test CIF flag of another CPU. The caller needs to ensure that
  59  * CPU hotplug can not happen, e.g. by disabling preemption.
  60  */
  61 static inline int test_cpu_flag_of(int flag, int cpu)
  62 {
  63         struct lowcore *lc = lowcore_ptr[cpu];
  64         return !!(lc->cpu_flags & (1UL << flag));
  65 }
  66
  67 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
  68
  69 /*
  70  * Default implementation of macro that returns current
  71  * instruction pointer ("program counter").
  72  */
  73 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
  74
  75 static inline void get_cpu_id(struct cpuid *ptr)
  76 {
  77         asm volatile("stidp %0" : "=Q" (*ptr));
  78 }
  79
  80 void s390_adjust_jiffies(void);
  81 void s390_update_cpu_mhz(void);
  82 void cpu_detect_mhz_feature(void);
  83
  84 extern const struct seq_operations cpuinfo_op;
  85 extern int sysctl_ieee_emulation_warnings;
  86 extern void execve_tail(void);
  87
  88 /*
  89  * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  90  */
  91
  92 #define TASK_SIZE_OF(tsk)       ((tsk)->mm ? \
  93                                  (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
  94 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  95                                         (1UL << 30) : (1UL << 41))
  96 #define TASK_SIZE               TASK_SIZE_OF(current)
  97 #define TASK_MAX_SIZE           (1UL << 53)
  98
  99 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
 100 #define STACK_TOP_MAX           (1UL << 42)
 101
 102 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 103
 104 typedef struct {
 105         __u32 ar4;
 106 } mm_segment_t;
 107
 108 /*
 109  * Thread structure
 110  */
 111 struct thread_struct {
 112         unsigned int  acrs[NUM_ACRS];
 113         unsigned long ksp;              /* kernel stack pointer             */
 114         unsigned long user_timer;       /* task cputime in user space */
 115         unsigned long system_timer;     /* task cputime in kernel space */
 116         unsigned long sys_call_table;   /* system call table address */
 117         mm_segment_t mm_segment;
 118         unsigned long gmap_addr;        /* address of last gmap fault. */
 119         unsigned int gmap_write_flag;   /* gmap fault write indication */
 120         unsigned int gmap_int_code;     /* int code of last gmap fault */
 121         unsigned int gmap_pfault;       /* signal of a pending guest pfault */
 122         /* Per-thread information related to debugging */
 123         struct per_regs per_user;       /* User specified PER registers */
 124         struct per_event per_event;     /* Cause of the last PER trap */
 125         unsigned long per_flags;        /* Flags to control debug behavior */
 126         unsigned int system_call;       /* system call number in signal */
 127         unsigned long last_break;       /* last breaking-event-address. */
 128         /* pfault_wait is used to block the process on a pfault event */
 129         unsigned long pfault_wait;
 130         struct list_head list;
 131         /* cpu runtime instrumentation */
 132         struct runtime_instr_cb *ri_cb;
 133         unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
 134         /*
 135          * Warning: 'fpu' is dynamically-sized. It *MUST* be at
 136          * the end.
 137          */
 138         struct fpu fpu;                 /* FP and VX register save area */
 139 };
 140
 141 /* Flag to disable transactions. */
 142 #define PER_FLAG_NO_TE                  1UL
 143 /* Flag to enable random transaction aborts. */
 144 #define PER_FLAG_TE_ABORT_RAND          2UL
 145 /* Flag to specify random transaction abort mode:
 146  * - abort each transaction at a random instruction before TEND if set.
 147  * - abort random transactions at a random instruction if cleared.
 148  */
 149 #define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 150
 151 typedef struct thread_struct thread_struct;
 152
 153 /*
 154  * Stack layout of a C stack frame.
 155  */
 156 #ifndef __PACK_STACK
 157 struct stack_frame {
 158         unsigned long back_chain;
 159         unsigned long empty1[5];
 160         unsigned long gprs[10];
 161         unsigned int  empty2[8];
 162 };
 163 #else
 164 struct stack_frame {
 165         unsigned long empty1[5];
 166         unsigned int  empty2[8];
 167         unsigned long gprs[10];
 168         unsigned long back_chain;
 169 };
 170 #endif
 171
 172 #define ARCH_MIN_TASKALIGN      8
 173
 174 #define INIT_THREAD {                                                   \
 175         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 176         .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 177 }
 178
 179 /*
 180  * Do necessary setup to start up a new thread.
 181  */
 182 #define start_thread(regs, new_psw, new_stackp) do {                    \
 183         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 184         regs->psw.addr  = new_psw;                                      \
 185         regs->gprs[15]  = new_stackp;                                   \
 186         execve_tail();                                                  \
 187 } while (0)
 188
 189 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 190         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 191         regs->psw.addr  = new_psw;                                      \
 192         regs->gprs[15]  = new_stackp;                                   \
 193         crst_table_downgrade(current->mm);                              \
 194         execve_tail();                                                  \
 195 } while (0)
 196
 197 /* Forward declaration, a strange C thing */
 198 struct task_struct;
 199 struct mm_struct;
 200 struct seq_file;
 201
 202 typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
 203 void dump_trace(dump_trace_func_t func, void *data,
 204                 struct task_struct *task, unsigned long sp);
 205
 206 void show_cacheinfo(struct seq_file *m);
 207
 208 /* Free all resources held by a thread. */
 209 extern void release_thread(struct task_struct *);
 210
 211 /*
 212  * Return saved PC of a blocked thread.
 213  */
 214 extern unsigned long thread_saved_pc(struct task_struct *t);
 215
 216 unsigned long get_wchan(struct task_struct *p);
 217 #define task_pt_regs(tsk) ((struct pt_regs *) \
 218         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 219 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 220 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 221
 222 /* Has task runtime instrumentation enabled ? */
 223 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 224
 225 static inline unsigned long current_stack_pointer(void)
 226 {
 227         unsigned long sp;
 228
 229         asm volatile("la %0,0(15)" : "=a" (sp));
 230         return sp;
 231 }
 232
 233 static inline unsigned short stap(void)
 234 {
 235         unsigned short cpu_address;
 236
 237         asm volatile("stap %0" : "=m" (cpu_address));
 238         return cpu_address;
 239 }
 240
 241 /*
 242  * Give up the time slice of the virtual PU.
 243  */
 244 #define cpu_relax_yield cpu_relax_yield
 245 void cpu_relax_yield(void);
 246
 247 #define cpu_relax() barrier()
 248
 249 #define ECAG_CACHE_ATTRIBUTE    0
 250 #define ECAG_CPU_ATTRIBUTE      1
 251
 252 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 253 {
 254         unsigned long val;
 255
 256         asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 257                      : "=d" (val) : "a" (asi << 8 | parm));
 258         return val;
 259 }
 260
 261 static inline void psw_set_key(unsigned int key)
 262 {
 263         asm volatile("spka 0(%0)" : : "d" (key));
 264 }
 265
 266 /*
 267  * Set PSW to specified value.
 268  */
 269 static inline void __load_psw(psw_t psw)
 270 {
 271         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 272 }
 273
 274 /*
 275  * Set PSW mask to specified value, while leaving the
 276  * PSW addr pointing to the next instruction.
 277  */
 278 static inline void __load_psw_mask(unsigned long mask)
 279 {
 280         unsigned long addr;
 281         psw_t psw;
 282
 283         psw.mask = mask;
 284
 285         asm volatile(
 286                 "       larl    %0,1f\n"
 287                 "       stg     %0,%O1+8(%R1)\n"
 288                 "       lpswe   %1\n"
 289                 "1:"
 290                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 291 }
 292
 293 /*
 294  * Extract current PSW mask
 295  */
 296 static inline unsigned long __extract_psw(void)
 297 {
 298         unsigned int reg1, reg2;
 299
 300         asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 301         return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 302 }
 303
 304 static inline void local_mcck_enable(void)
 305 {
 306         __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 307 }
 308
 309 static inline void local_mcck_disable(void)
 310 {
 311         __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 312 }
 313
 314 /*
 315  * Rewind PSW instruction address by specified number of bytes.
 316  */
 317 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 318 {
 319         unsigned long mask;
 320
 321         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 322                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 323                                           (1UL << 24) - 1;
 324         return (psw.addr - ilc) & mask;
 325 }
 326
 327 /*
 328  * Function to stop a processor until the next interrupt occurs
 329  */
 330 void enabled_wait(void);
 331
 332 /*
 333  * Function to drop a processor into disabled wait state
 334  */
 335 static inline void __noreturn disabled_wait(unsigned long code)
 336 {
 337         psw_t psw;
 338
 339         psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 340         psw.addr = code;
 341         __load_psw(psw);
 342         while (1);
 343 }
 344
 345 /*
 346  * Basic Machine Check/Program Check Handler.
 347  */
 348
 349 extern void s390_base_mcck_handler(void);
 350 extern void s390_base_pgm_handler(void);
 351 extern void s390_base_ext_handler(void);
 352
 353 extern void (*s390_base_mcck_handler_fn)(void);
 354 extern void (*s390_base_pgm_handler_fn)(void);
 355 extern void (*s390_base_ext_handler_fn)(void);
 356
 357 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 358
 359 extern int memcpy_real(void *, void *, size_t);
 360 extern void memcpy_absolute(void *, void *, size_t);
 361
 362 #define mem_assign_absolute(dest, val) {                        \
 363         __typeof__(dest) __tmp = (val);                         \
 364                                                                 \
 365         BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 366         memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 367 }
 368
 369 #endif /* __ASSEMBLY__ */
 370
 371 #endif /* __ASM_S390_PROCESSOR_H */