arch/s390/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  S390 version
   4  *    Copyright IBM Corp. 1999
   5  *    Author(s): Hartmut Penner (hp@de.ibm.com),
   6  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   7  *
   8  *  Derived from "include/asm-i386/processor.h"
   9  *    Copyright (C) 1994, Linus Torvalds
  10  */
  11
  12 #ifndef __ASM_S390_PROCESSOR_H
  13 #define __ASM_S390_PROCESSOR_H
  14
  15 #include <linux/bits.h>
  16
  17 #define CIF_MCCK_PENDING        0       /* machine check handling is pending */
  18 #define CIF_ASCE_PRIMARY        1       /* primary asce needs fixup / uaccess */
  19 #define CIF_ASCE_SECONDARY      2       /* secondary asce needs fixup / uaccess */
  20 #define CIF_NOHZ_DELAY          3       /* delay HZ disable for a tick */
  21 #define CIF_FPU                 4       /* restore FPU registers */
  22 #define CIF_IGNORE_IRQ          5       /* ignore interrupt (for udelay) */
  23 #define CIF_ENABLED_WAIT        6       /* in enabled wait state */
  24 #define CIF_MCCK_GUEST          7       /* machine check happening in guest */
  25 #define CIF_DEDICATED_CPU       8       /* this CPU is dedicated */
  26
  27 #define _CIF_MCCK_PENDING       BIT(CIF_MCCK_PENDING)
  28 #define _CIF_ASCE_PRIMARY       BIT(CIF_ASCE_PRIMARY)
  29 #define _CIF_ASCE_SECONDARY     BIT(CIF_ASCE_SECONDARY)
  30 #define _CIF_NOHZ_DELAY         BIT(CIF_NOHZ_DELAY)
  31 #define _CIF_FPU                BIT(CIF_FPU)
  32 #define _CIF_IGNORE_IRQ         BIT(CIF_IGNORE_IRQ)
  33 #define _CIF_ENABLED_WAIT       BIT(CIF_ENABLED_WAIT)
  34 #define _CIF_MCCK_GUEST         BIT(CIF_MCCK_GUEST)
  35 #define _CIF_DEDICATED_CPU      BIT(CIF_DEDICATED_CPU)
  36
  37 #ifndef __ASSEMBLY__
  38
  39 #include <linux/cpumask.h>
  40 #include <linux/linkage.h>
  41 #include <linux/irqflags.h>
  42 #include <asm/cpu.h>
  43 #include <asm/page.h>
  44 #include <asm/ptrace.h>
  45 #include <asm/setup.h>
  46 #include <asm/runtime_instr.h>
  47 #include <asm/fpu/types.h>
  48 #include <asm/fpu/internal.h>
  49
  50 static inline void set_cpu_flag(int flag)
  51 {
  52         S390_lowcore.cpu_flags |= (1UL << flag);
  53 }
  54
  55 static inline void clear_cpu_flag(int flag)
  56 {
  57         S390_lowcore.cpu_flags &= ~(1UL << flag);
  58 }
  59
  60 static inline int test_cpu_flag(int flag)
  61 {
  62         return !!(S390_lowcore.cpu_flags & (1UL << flag));
  63 }
  64
  65 /*
  66  * Test CIF flag of another CPU. The caller needs to ensure that
  67  * CPU hotplug can not happen, e.g. by disabling preemption.
  68  */
  69 static inline int test_cpu_flag_of(int flag, int cpu)
  70 {
  71         struct lowcore *lc = lowcore_ptr[cpu];
  72         return !!(lc->cpu_flags & (1UL << flag));
  73 }
  74
  75 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
  76
  77 static inline void get_cpu_id(struct cpuid *ptr)
  78 {
  79         asm volatile("stidp %0" : "=Q" (*ptr));
  80 }
  81
  82 void s390_adjust_jiffies(void);
  83 void s390_update_cpu_mhz(void);
  84 void cpu_detect_mhz_feature(void);
  85
  86 extern const struct seq_operations cpuinfo_op;
  87 extern void execve_tail(void);
  88 extern void __bpon(void);
  89
  90 /*
  91  * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  92  */
  93
  94 #define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
  95                                         (1UL << 31) : -PAGE_SIZE)
  96 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  97                                         (1UL << 30) : (1UL << 41))
  98 #define TASK_SIZE               TASK_SIZE_OF(current)
  99 #define TASK_SIZE_MAX           (-PAGE_SIZE)
 100
 101 #define STACK_TOP               (test_thread_flag(TIF_31BIT) ? \
 102                                         (1UL << 31) : (1UL << 42))
 103 #define STACK_TOP_MAX           (1UL << 42)
 104
 105 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 106
 107 typedef unsigned int mm_segment_t;
 108
 109 /*
 110  * Thread structure
 111  */
 112 struct thread_struct {
 113         unsigned int  acrs[NUM_ACRS];
 114         unsigned long ksp;              /* kernel stack pointer             */
 115         unsigned long user_timer;       /* task cputime in user space */
 116         unsigned long guest_timer;      /* task cputime in kvm guest */
 117         unsigned long system_timer;     /* task cputime in kernel space */
 118         unsigned long hardirq_timer;    /* task cputime in hardirq context */
 119         unsigned long softirq_timer;    /* task cputime in softirq context */
 120         unsigned long sys_call_table;   /* system call table address */
 121         mm_segment_t mm_segment;
 122         unsigned long gmap_addr;        /* address of last gmap fault. */
 123         unsigned int gmap_write_flag;   /* gmap fault write indication */
 124         unsigned int gmap_int_code;     /* int code of last gmap fault */
 125         unsigned int gmap_pfault;       /* signal of a pending guest pfault */
 126         /* Per-thread information related to debugging */
 127         struct per_regs per_user;       /* User specified PER registers */
 128         struct per_event per_event;     /* Cause of the last PER trap */
 129         unsigned long per_flags;        /* Flags to control debug behavior */
 130         unsigned int system_call;       /* system call number in signal */
 131         unsigned long last_break;       /* last breaking-event-address. */
 132         /* pfault_wait is used to block the process on a pfault event */
 133         unsigned long pfault_wait;
 134         struct list_head list;
 135         /* cpu runtime instrumentation */
 136         struct runtime_instr_cb *ri_cb;
 137         struct gs_cb *gs_cb;            /* Current guarded storage cb */
 138         struct gs_cb *gs_bc_cb;         /* Broadcast guarded storage cb */
 139         unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
 140         /*
 141          * Warning: 'fpu' is dynamically-sized. It *MUST* be at
 142          * the end.
 143          */
 144         struct fpu fpu;                 /* FP and VX register save area */
 145 };
 146
 147 /* Flag to disable transactions. */
 148 #define PER_FLAG_NO_TE                  1UL
 149 /* Flag to enable random transaction aborts. */
 150 #define PER_FLAG_TE_ABORT_RAND          2UL
 151 /* Flag to specify random transaction abort mode:
 152  * - abort each transaction at a random instruction before TEND if set.
 153  * - abort random transactions at a random instruction if cleared.
 154  */
 155 #define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 156
 157 typedef struct thread_struct thread_struct;
 158
 159 #define ARCH_MIN_TASKALIGN      8
 160
 161 #define INIT_THREAD {                                                   \
 162         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 163         .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 164 }
 165
 166 /*
 167  * Do necessary setup to start up a new thread.
 168  */
 169 #define start_thread(regs, new_psw, new_stackp) do {                    \
 170         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 171         regs->psw.addr  = new_psw;                                      \
 172         regs->gprs[15]  = new_stackp;                                   \
 173         execve_tail();                                                  \
 174 } while (0)
 175
 176 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 177         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 178         regs->psw.addr  = new_psw;                                      \
 179         regs->gprs[15]  = new_stackp;                                   \
 180         crst_table_downgrade(current->mm);                              \
 181         execve_tail();                                                  \
 182 } while (0)
 183
 184 /* Forward declaration, a strange C thing */
 185 struct task_struct;
 186 struct mm_struct;
 187 struct seq_file;
 188 struct pt_regs;
 189
 190 void show_registers(struct pt_regs *regs);
 191 void show_cacheinfo(struct seq_file *m);
 192
 193 /* Free all resources held by a thread. */
 194 static inline void release_thread(struct task_struct *tsk) { }
 195
 196 /* Free guarded storage control block */
 197 void guarded_storage_release(struct task_struct *tsk);
 198
 199 unsigned long get_wchan(struct task_struct *p);
 200 #define task_pt_regs(tsk) ((struct pt_regs *) \
 201         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 202 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 203 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 204
 205 /* Has task runtime instrumentation enabled ? */
 206 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 207
 208 static __always_inline unsigned long current_stack_pointer(void)
 209 {
 210         unsigned long sp;
 211
 212         asm volatile("la %0,0(15)" : "=a" (sp));
 213         return sp;
 214 }
 215
 216 static __no_kasan_or_inline unsigned short stap(void)
 217 {
 218         unsigned short cpu_address;
 219
 220         asm volatile("stap %0" : "=Q" (cpu_address));
 221         return cpu_address;
 222 }
 223
 224 #define cpu_relax() barrier()
 225
 226 #define ECAG_CACHE_ATTRIBUTE    0
 227 #define ECAG_CPU_ATTRIBUTE      1
 228
 229 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 230 {
 231         unsigned long val;
 232
 233         asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 234                      : "=d" (val) : "a" (asi << 8 | parm));
 235         return val;
 236 }
 237
 238 static inline void psw_set_key(unsigned int key)
 239 {
 240         asm volatile("spka 0(%0)" : : "d" (key));
 241 }
 242
 243 /*
 244  * Set PSW to specified value.
 245  */
 246 static inline void __load_psw(psw_t psw)
 247 {
 248         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 249 }
 250
 251 /*
 252  * Set PSW mask to specified value, while leaving the
 253  * PSW addr pointing to the next instruction.
 254  */
 255 static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
 256 {
 257         unsigned long addr;
 258         psw_t psw;
 259
 260         psw.mask = mask;
 261
 262         asm volatile(
 263                 "       larl    %0,1f\n"
 264                 "       stg     %0,%1\n"
 265                 "       lpswe   %2\n"
 266                 "1:"
 267                 : "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc");
 268 }
 269
 270 /*
 271  * Extract current PSW mask
 272  */
 273 static inline unsigned long __extract_psw(void)
 274 {
 275         unsigned int reg1, reg2;
 276
 277         asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 278         return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 279 }
 280
 281 static inline void local_mcck_enable(void)
 282 {
 283         __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 284 }
 285
 286 static inline void local_mcck_disable(void)
 287 {
 288         __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 289 }
 290
 291 /*
 292  * Rewind PSW instruction address by specified number of bytes.
 293  */
 294 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 295 {
 296         unsigned long mask;
 297
 298         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 299                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 300                                           (1UL << 24) - 1;
 301         return (psw.addr - ilc) & mask;
 302 }
 303
 304 /*
 305  * Function to stop a processor until the next interrupt occurs
 306  */
 307 void enabled_wait(void);
 308
 309 /*
 310  * Function to drop a processor into disabled wait state
 311  */
 312 static __always_inline void __noreturn disabled_wait(void)
 313 {
 314         psw_t psw;
 315
 316         psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 317         psw.addr = _THIS_IP_;
 318         __load_psw(psw);
 319         while (1);
 320 }
 321
 322 /*
 323  * Basic Machine Check/Program Check Handler.
 324  */
 325
 326 extern void s390_base_pgm_handler(void);
 327 extern void s390_base_ext_handler(void);
 328
 329 extern void (*s390_base_pgm_handler_fn)(void);
 330 extern void (*s390_base_ext_handler_fn)(void);
 331
 332 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 333
 334 extern int memcpy_real(void *, void *, size_t);
 335 extern void memcpy_absolute(void *, void *, size_t);
 336
 337 #define mem_assign_absolute(dest, val) do {                     \
 338         __typeof__(dest) __tmp = (val);                         \
 339                                                                 \
 340         BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 341         memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 342 } while (0)
 343
 344 extern int s390_isolate_bp(void);
 345 extern int s390_isolate_bp_guest(void);
 346
 347 #endif /* __ASSEMBLY__ */
 348
 349 #endif /* __ASM_S390_PROCESSOR_H */