LXR linux/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
  50static inline void set_cpu_flag(int flag)
  51{
  52        S390_lowcore.cpu_flags |= (1UL << flag);
  53}
  54
  55static inline void clear_cpu_flag(int flag)
  56{
  57        S390_lowcore.cpu_flags &= ~(1UL << flag);
  58}
  59
  60static 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 */
  69static 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
  77static inline void get_cpu_id(struct cpuid *ptr)
  78{
  79        asm volatile("stidp %0" : "=Q" (*ptr));
  80}
  81
  82void s390_adjust_jiffies(void);
  83void s390_update_cpu_mhz(void);
  84void cpu_detect_mhz_feature(void);
  85
  86extern const struct seq_operations cpuinfo_op;
  87extern int sysctl_ieee_emulation_warnings;
  88extern void execve_tail(void);
  89extern void __bpon(void);
  90
  91/*
  92 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  93 */
  94
  95#define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
  96                                        (1UL << 31) : -PAGE_SIZE)
  97#define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  98                                        (1UL << 30) : (1UL << 41))
  99#define TASK_SIZE               TASK_SIZE_OF(current)
 100#define TASK_SIZE_MAX           (-PAGE_SIZE)
 101
 102#define STACK_TOP               (test_thread_flag(TIF_31BIT) ? \
 103                                        (1UL << 31) : (1UL << 42))
 104#define STACK_TOP_MAX           (1UL << 42)
 105
 106#define HAVE_ARCH_PICK_MMAP_LAYOUT
 107
 108typedef unsigned int mm_segment_t;
 109
 110/*
 111 * Thread structure
 112 */
 113struct thread_struct {
 114        unsigned int  acrs[NUM_ACRS];
 115        unsigned long ksp;              /* kernel stack pointer             */
 116        unsigned long user_timer;       /* task cputime in user space */
 117        unsigned long guest_timer;      /* task cputime in kvm guest */
 118        unsigned long system_timer;     /* task cputime in kernel space */
 119        unsigned long hardirq_timer;    /* task cputime in hardirq context */
 120        unsigned long softirq_timer;    /* task cputime in softirq context */
 121        unsigned long sys_call_table;   /* system call table address */
 122        mm_segment_t mm_segment;
 123        unsigned long gmap_addr;        /* address of last gmap fault. */
 124        unsigned int gmap_write_flag;   /* gmap fault write indication */
 125        unsigned int gmap_int_code;     /* int code of last gmap fault */
 126        unsigned int gmap_pfault;       /* signal of a pending guest pfault */
 127        /* Per-thread information related to debugging */
 128        struct per_regs per_user;       /* User specified PER registers */
 129        struct per_event per_event;     /* Cause of the last PER trap */
 130        unsigned long per_flags;        /* Flags to control debug behavior */
 131        unsigned int system_call;       /* system call number in signal */
 132        unsigned long last_break;       /* last breaking-event-address. */
 133        /* pfault_wait is used to block the process on a pfault event */
 134        unsigned long pfault_wait;
 135        struct list_head list;
 136        /* cpu runtime instrumentation */
 137        struct runtime_instr_cb *ri_cb;
 138        struct gs_cb *gs_cb;            /* Current guarded storage cb */
 139        struct gs_cb *gs_bc_cb;         /* Broadcast guarded storage cb */
 140        unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
 141        /*
 142         * Warning: 'fpu' is dynamically-sized. It *MUST* be at
 143         * the end.
 144         */
 145        struct fpu fpu;                 /* FP and VX register save area */
 146};
 147
 148/* Flag to disable transactions. */
 149#define PER_FLAG_NO_TE                  1UL
 150/* Flag to enable random transaction aborts. */
 151#define PER_FLAG_TE_ABORT_RAND          2UL
 152/* Flag to specify random transaction abort mode:
 153 * - abort each transaction at a random instruction before TEND if set.
 154 * - abort random transactions at a random instruction if cleared.
 155 */
 156#define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 157
 158typedef struct thread_struct thread_struct;
 159
 160#define ARCH_MIN_TASKALIGN      8
 161
 162#define INIT_THREAD {                                                   \
 163        .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 164        .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 165}
 166
 167/*
 168 * Do necessary setup to start up a new thread.
 169 */
 170#define start_thread(regs, new_psw, new_stackp) do {                    \
 171        regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 172        regs->psw.addr  = new_psw;                                      \
 173        regs->gprs[15]  = new_stackp;                                   \
 174        execve_tail();                                                  \
 175} while (0)
 176
 177#define start_thread31(regs, new_psw, new_stackp) do {                  \
 178        regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 179        regs->psw.addr  = new_psw;                                      \
 180        regs->gprs[15]  = new_stackp;                                   \
 181        crst_table_downgrade(current->mm);                              \
 182        execve_tail();                                                  \
 183} while (0)
 184
 185/* Forward declaration, a strange C thing */
 186struct task_struct;
 187struct mm_struct;
 188struct seq_file;
 189struct pt_regs;
 190
 191void show_registers(struct pt_regs *regs);
 192void show_cacheinfo(struct seq_file *m);
 193
 194/* Free all resources held by a thread. */
 195static inline void release_thread(struct task_struct *tsk) { }
 196
 197/* Free guarded storage control block */
 198void guarded_storage_release(struct task_struct *tsk);
 199
 200unsigned long get_wchan(struct task_struct *p);
 201#define task_pt_regs(tsk) ((struct pt_regs *) \
 202        (task_stack_page(tsk) + THREAD_SIZE) - 1)
 203#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 204#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 205
 206/* Has task runtime instrumentation enabled ? */
 207#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 208
 209static __always_inline unsigned long current_stack_pointer(void)
 210{
 211        unsigned long sp;
 212
 213        asm volatile("la %0,0(15)" : "=a" (sp));
 214        return sp;
 215}
 216
 217static __no_kasan_or_inline unsigned short stap(void)
 218{
 219        unsigned short cpu_address;
 220
 221        asm volatile("stap %0" : "=Q" (cpu_address));
 222        return cpu_address;
 223}
 224
 225#define cpu_relax() barrier()
 226
 227#define ECAG_CACHE_ATTRIBUTE    0
 228#define ECAG_CPU_ATTRIBUTE      1
 229
 230static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 231{
 232        unsigned long val;
 233
 234        asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 235                     : "=d" (val) : "a" (asi << 8 | parm));
 236        return val;
 237}
 238
 239static inline void psw_set_key(unsigned int key)
 240{
 241        asm volatile("spka 0(%0)" : : "d" (key));
 242}
 243
 244/*
 245 * Set PSW to specified value.
 246 */
 247static inline void __load_psw(psw_t psw)
 248{
 249        asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 250}
 251
 252/*
 253 * Set PSW mask to specified value, while leaving the
 254 * PSW addr pointing to the next instruction.
 255 */
 256static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
 257{
 258        unsigned long addr;
 259        psw_t psw;
 260
 261        psw.mask = mask;
 262
 263        asm volatile(
 264                "       larl    %0,1f\n"
 265                "       stg     %0,%1\n"
 266                "       lpswe   %2\n"
 267                "1:"
 268                : "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc");
 269}
 270
 271/*
 272 * Extract current PSW mask
 273 */
 274static inline unsigned long __extract_psw(void)
 275{
 276        unsigned int reg1, reg2;
 277
 278        asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 279        return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 280}
 281
 282static inline void local_mcck_enable(void)
 283{
 284        __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 285}
 286
 287static inline void local_mcck_disable(void)
 288{
 289        __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 290}
 291
 292/*
 293 * Rewind PSW instruction address by specified number of bytes.
 294 */
 295static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 296{
 297        unsigned long mask;
 298
 299        mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 300               (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 301                                          (1UL << 24) - 1;
 302        return (psw.addr - ilc) & mask;
 303}
 304
 305/*
 306 * Function to stop a processor until the next interrupt occurs
 307 */
 308void enabled_wait(void);
 309
 310/*
 311 * Function to drop a processor into disabled wait state
 312 */
 313static __always_inline void __noreturn disabled_wait(void)
 314{
 315        psw_t psw;
 316
 317        psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 318        psw.addr = _THIS_IP_;
 319        __load_psw(psw);
 320        while (1);
 321}
 322
 323/*
 324 * Basic Machine Check/Program Check Handler.
 325 */
 326
 327extern void s390_base_pgm_handler(void);
 328extern void s390_base_ext_handler(void);
 329
 330extern void (*s390_base_pgm_handler_fn)(void);
 331extern void (*s390_base_ext_handler_fn)(void);
 332
 333#define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 334
 335extern int memcpy_real(void *, void *, size_t);
 336extern void memcpy_absolute(void *, void *, size_t);
 337
 338#define mem_assign_absolute(dest, val) do {                     \
 339        __typeof__(dest) __tmp = (val);                         \
 340                                                                \
 341        BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 342        memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 343} while (0)
 344
 345extern int s390_isolate_bp(void);
 346extern int s390_isolate_bp_guest(void);
 347
 348#endif /* __ASSEMBLY__ */
 349
 350#endif /* __ASM_S390_PROCESSOR_H */
 351