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->context.asce_limit)
  93 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  94                                         (1UL << 30) : (1UL << 41))
  95 #define TASK_SIZE               TASK_SIZE_OF(current)
  96 #define TASK_MAX_SIZE           (1UL << 53)
  97
  98 #define STACK_TOP               (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
  99 #define STACK_TOP_MAX           (1UL << 42)
 100
 101 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 102
 103 typedef struct {
 104         __u32 ar4;
 105 } mm_segment_t;
 106
 107 /*
 108  * Thread structure
 109  */
 110 struct thread_struct {
 111         unsigned int  acrs[NUM_ACRS];
 112         unsigned long ksp;              /* kernel stack pointer             */
 113         mm_segment_t mm_segment;
 114         unsigned long gmap_addr;        /* address of last gmap fault. */
 115         unsigned int gmap_write_flag;   /* gmap fault write indication */
 116         unsigned int gmap_int_code;     /* int code of last gmap fault */
 117         unsigned int gmap_pfault;       /* signal of a pending guest pfault */
 118         struct per_regs per_user;       /* User specified PER registers */
 119         struct per_event per_event;     /* Cause of the last PER trap */
 120         unsigned long per_flags;        /* Flags to control debug behavior */
 121         /* pfault_wait is used to block the process on a pfault event */
 122         unsigned long pfault_wait;
 123         struct list_head list;
 124         /* cpu runtime instrumentation */
 125         struct runtime_instr_cb *ri_cb;
 126         unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
 127         /*
 128          * Warning: 'fpu' is dynamically-sized. It *MUST* be at
 129          * the end.
 130          */
 131         struct fpu fpu;                 /* FP and VX register save area */
 132 };
 133
 134 /* Flag to disable transactions. */
 135 #define PER_FLAG_NO_TE                  1UL
 136 /* Flag to enable random transaction aborts. */
 137 #define PER_FLAG_TE_ABORT_RAND          2UL
 138 /* Flag to specify random transaction abort mode:
 139  * - abort each transaction at a random instruction before TEND if set.
 140  * - abort random transactions at a random instruction if cleared.
 141  */
 142 #define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 143
 144 typedef struct thread_struct thread_struct;
 145
 146 /*
 147  * Stack layout of a C stack frame.
 148  */
 149 #ifndef __PACK_STACK
 150 struct stack_frame {
 151         unsigned long back_chain;
 152         unsigned long empty1[5];
 153         unsigned long gprs[10];
 154         unsigned int  empty2[8];
 155 };
 156 #else
 157 struct stack_frame {
 158         unsigned long empty1[5];
 159         unsigned int  empty2[8];
 160         unsigned long gprs[10];
 161         unsigned long back_chain;
 162 };
 163 #endif
 164
 165 #define ARCH_MIN_TASKALIGN      8
 166
 167 #define INIT_THREAD {                                                   \
 168         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 169         .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 170 }
 171
 172 /*
 173  * Do necessary setup to start up a new thread.
 174  */
 175 #define start_thread(regs, new_psw, new_stackp) do {                    \
 176         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 177         regs->psw.addr  = new_psw;                                      \
 178         regs->gprs[15]  = new_stackp;                                   \
 179         execve_tail();                                                  \
 180 } while (0)
 181
 182 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 183         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 184         regs->psw.addr  = new_psw;                                      \
 185         regs->gprs[15]  = new_stackp;                                   \
 186         crst_table_downgrade(current->mm);                              \
 187         execve_tail();                                                  \
 188 } while (0)
 189
 190 /* Forward declaration, a strange C thing */
 191 struct task_struct;
 192 struct mm_struct;
 193 struct seq_file;
 194
 195 typedef int (*dump_trace_func_t)(void *data, unsigned long address);
 196 void dump_trace(dump_trace_func_t func, void *data,
 197                 struct task_struct *task, unsigned long sp);
 198
 199 void show_cacheinfo(struct seq_file *m);
 200
 201 /* Free all resources held by a thread. */
 202 extern void release_thread(struct task_struct *);
 203
 204 /*
 205  * Return saved PC of a blocked thread.
 206  */
 207 extern unsigned long thread_saved_pc(struct task_struct *t);
 208
 209 unsigned long get_wchan(struct task_struct *p);
 210 #define task_pt_regs(tsk) ((struct pt_regs *) \
 211         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 212 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 213 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 214
 215 /* Has task runtime instrumentation enabled ? */
 216 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 217
 218 static inline unsigned long current_stack_pointer(void)
 219 {
 220         unsigned long sp;
 221
 222         asm volatile("la %0,0(15)" : "=a" (sp));
 223         return sp;
 224 }
 225
 226 static inline unsigned short stap(void)
 227 {
 228         unsigned short cpu_address;
 229
 230         asm volatile("stap %0" : "=m" (cpu_address));
 231         return cpu_address;
 232 }
 233
 234 /*
 235  * Give up the time slice of the virtual PU.
 236  */
 237 void cpu_relax(void);
 238
 239 #define cpu_relax_lowlatency()  barrier()
 240
 241 #define ECAG_CACHE_ATTRIBUTE    0
 242 #define ECAG_CPU_ATTRIBUTE      1
 243
 244 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 245 {
 246         unsigned long val;
 247
 248         asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 249                      : "=d" (val) : "a" (asi << 8 | parm));
 250         return val;
 251 }
 252
 253 static inline void psw_set_key(unsigned int key)
 254 {
 255         asm volatile("spka 0(%0)" : : "d" (key));
 256 }
 257
 258 /*
 259  * Set PSW to specified value.
 260  */
 261 static inline void __load_psw(psw_t psw)
 262 {
 263         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 264 }
 265
 266 /*
 267  * Set PSW mask to specified value, while leaving the
 268  * PSW addr pointing to the next instruction.
 269  */
 270 static inline void __load_psw_mask(unsigned long mask)
 271 {
 272         unsigned long addr;
 273         psw_t psw;
 274
 275         psw.mask = mask;
 276
 277         asm volatile(
 278                 "       larl    %0,1f\n"
 279                 "       stg     %0,%O1+8(%R1)\n"
 280                 "       lpswe   %1\n"
 281                 "1:"
 282                 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 283 }
 284
 285 /*
 286  * Extract current PSW mask
 287  */
 288 static inline unsigned long __extract_psw(void)
 289 {
 290         unsigned int reg1, reg2;
 291
 292         asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 293         return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 294 }
 295
 296 static inline void local_mcck_enable(void)
 297 {
 298         __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 299 }
 300
 301 static inline void local_mcck_disable(void)
 302 {
 303         __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 304 }
 305
 306 /*
 307  * Rewind PSW instruction address by specified number of bytes.
 308  */
 309 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 310 {
 311         unsigned long mask;
 312
 313         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 314                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 315                                           (1UL << 24) - 1;
 316         return (psw.addr - ilc) & mask;
 317 }
 318
 319 /*
 320  * Function to stop a processor until the next interrupt occurs
 321  */
 322 void enabled_wait(void);
 323
 324 /*
 325  * Function to drop a processor into disabled wait state
 326  */
 327 static inline void __noreturn disabled_wait(unsigned long code)
 328 {
 329         psw_t psw;
 330
 331         psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 332         psw.addr = code;
 333         __load_psw(psw);
 334         while (1);
 335 }
 336
 337 /*
 338  * Basic Machine Check/Program Check Handler.
 339  */
 340
 341 extern void s390_base_mcck_handler(void);
 342 extern void s390_base_pgm_handler(void);
 343 extern void s390_base_ext_handler(void);
 344
 345 extern void (*s390_base_mcck_handler_fn)(void);
 346 extern void (*s390_base_pgm_handler_fn)(void);
 347 extern void (*s390_base_ext_handler_fn)(void);
 348
 349 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 350
 351 extern int memcpy_real(void *, void *, size_t);
 352 extern void memcpy_absolute(void *, void *, size_t);
 353
 354 #define mem_assign_absolute(dest, val) {                        \
 355         __typeof__(dest) __tmp = (val);                         \
 356                                                                 \
 357         BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 358         memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 359 }
 360
 361 #endif /* __ASSEMBLY__ */
 362
 363 #endif /* __ASM_S390_PROCESSOR_H */