linux/arch/s390/include/asm/lowcore.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *    Copyright IBM Corp. 1999, 2012
   4 *    Author(s): Hartmut Penner <hp@de.ibm.com>,
   5 *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
   6 *               Denis Joseph Barrow,
   7 */
   8
   9#ifndef _ASM_S390_LOWCORE_H
  10#define _ASM_S390_LOWCORE_H
  11
  12#include <linux/types.h>
  13#include <asm/ptrace.h>
  14#include <asm/cpu.h>
  15#include <asm/types.h>
  16
  17#define LC_ORDER 1
  18#define LC_PAGES 2
  19
  20struct pgm_tdb {
  21        u64 data[32];
  22};
  23
  24struct lowcore {
  25        __u8    pad_0x0000[0x0014-0x0000];      /* 0x0000 */
  26        __u32   ipl_parmblock_ptr;              /* 0x0014 */
  27        __u8    pad_0x0018[0x0080-0x0018];      /* 0x0018 */
  28        __u32   ext_params;                     /* 0x0080 */
  29        union {
  30                struct {
  31                        __u16 ext_cpu_addr;     /* 0x0084 */
  32                        __u16 ext_int_code;     /* 0x0086 */
  33                };
  34                __u32 ext_int_code_addr;
  35        };
  36        __u32   svc_int_code;                   /* 0x0088 */
  37        __u16   pgm_ilc;                        /* 0x008c */
  38        __u16   pgm_code;                       /* 0x008e */
  39        __u32   data_exc_code;                  /* 0x0090 */
  40        __u16   mon_class_num;                  /* 0x0094 */
  41        __u8    per_code;                       /* 0x0096 */
  42        __u8    per_atmid;                      /* 0x0097 */
  43        __u64   per_address;                    /* 0x0098 */
  44        __u8    exc_access_id;                  /* 0x00a0 */
  45        __u8    per_access_id;                  /* 0x00a1 */
  46        __u8    op_access_id;                   /* 0x00a2 */
  47        __u8    ar_mode_id;                     /* 0x00a3 */
  48        __u8    pad_0x00a4[0x00a8-0x00a4];      /* 0x00a4 */
  49        __u64   trans_exc_code;                 /* 0x00a8 */
  50        __u64   monitor_code;                   /* 0x00b0 */
  51        union {
  52                struct {
  53                        __u16   subchannel_id;  /* 0x00b8 */
  54                        __u16   subchannel_nr;  /* 0x00ba */
  55                        __u32   io_int_parm;    /* 0x00bc */
  56                        __u32   io_int_word;    /* 0x00c0 */
  57                };
  58                struct tpi_info tpi_info;       /* 0x00b8 */
  59        };
  60        __u8    pad_0x00c4[0x00c8-0x00c4];      /* 0x00c4 */
  61        __u32   stfl_fac_list;                  /* 0x00c8 */
  62        __u8    pad_0x00cc[0x00e8-0x00cc];      /* 0x00cc */
  63        __u64   mcck_interruption_code;         /* 0x00e8 */
  64        __u8    pad_0x00f0[0x00f4-0x00f0];      /* 0x00f0 */
  65        __u32   external_damage_code;           /* 0x00f4 */
  66        __u64   failing_storage_address;        /* 0x00f8 */
  67        __u8    pad_0x0100[0x0110-0x0100];      /* 0x0100 */
  68        __u64   breaking_event_addr;            /* 0x0110 */
  69        __u8    pad_0x0118[0x0120-0x0118];      /* 0x0118 */
  70        psw_t   restart_old_psw;                /* 0x0120 */
  71        psw_t   external_old_psw;               /* 0x0130 */
  72        psw_t   svc_old_psw;                    /* 0x0140 */
  73        psw_t   program_old_psw;                /* 0x0150 */
  74        psw_t   mcck_old_psw;                   /* 0x0160 */
  75        psw_t   io_old_psw;                     /* 0x0170 */
  76        __u8    pad_0x0180[0x01a0-0x0180];      /* 0x0180 */
  77        psw_t   restart_psw;                    /* 0x01a0 */
  78        psw_t   external_new_psw;               /* 0x01b0 */
  79        psw_t   svc_new_psw;                    /* 0x01c0 */
  80        psw_t   program_new_psw;                /* 0x01d0 */
  81        psw_t   mcck_new_psw;                   /* 0x01e0 */
  82        psw_t   io_new_psw;                     /* 0x01f0 */
  83
  84        /* Save areas. */
  85        __u64   save_area_sync[8];              /* 0x0200 */
  86        __u64   save_area_async[8];             /* 0x0240 */
  87        __u64   save_area_restart[1];           /* 0x0280 */
  88
  89        /* CPU flags. */
  90        __u64   cpu_flags;                      /* 0x0288 */
  91
  92        /* Return psws. */
  93        psw_t   return_psw;                     /* 0x0290 */
  94        psw_t   return_mcck_psw;                /* 0x02a0 */
  95
  96        /* CPU accounting and timing values. */
  97        __u64   sys_enter_timer;                /* 0x02b0 */
  98        __u8    pad_0x02b8[0x02c0-0x02b8];      /* 0x02b8 */
  99        __u64   mcck_enter_timer;               /* 0x02c0 */
 100        __u64   exit_timer;                     /* 0x02c8 */
 101        __u64   user_timer;                     /* 0x02d0 */
 102        __u64   guest_timer;                    /* 0x02d8 */
 103        __u64   system_timer;                   /* 0x02e0 */
 104        __u64   hardirq_timer;                  /* 0x02e8 */
 105        __u64   softirq_timer;                  /* 0x02f0 */
 106        __u64   steal_timer;                    /* 0x02f8 */
 107        __u64   avg_steal_timer;                /* 0x0300 */
 108        __u64   last_update_timer;              /* 0x0308 */
 109        __u64   last_update_clock;              /* 0x0310 */
 110        __u64   int_clock;                      /* 0x0318*/
 111        __u64   mcck_clock;                     /* 0x0320 */
 112        __u64   clock_comparator;               /* 0x0328 */
 113        __u64   boot_clock[2];                  /* 0x0330 */
 114
 115        /* Current process. */
 116        __u64   current_task;                   /* 0x0340 */
 117        __u64   kernel_stack;                   /* 0x0348 */
 118
 119        /* Interrupt, DAT-off and restartstack. */
 120        __u64   async_stack;                    /* 0x0350 */
 121        __u64   nodat_stack;                    /* 0x0358 */
 122        __u64   restart_stack;                  /* 0x0360 */
 123        __u64   mcck_stack;                     /* 0x0368 */
 124        /* Restart function and parameter. */
 125        __u64   restart_fn;                     /* 0x0370 */
 126        __u64   restart_data;                   /* 0x0378 */
 127        __u64   restart_source;                 /* 0x0380 */
 128
 129        /* Address space pointer. */
 130        __u64   kernel_asce;                    /* 0x0388 */
 131        __u64   user_asce;                      /* 0x0390 */
 132
 133        /*
 134         * The lpp and current_pid fields form a
 135         * 64-bit value that is set as program
 136         * parameter with the LPP instruction.
 137         */
 138        __u32   lpp;                            /* 0x0398 */
 139        __u32   current_pid;                    /* 0x039c */
 140
 141        /* SMP info area */
 142        __u32   cpu_nr;                         /* 0x03a0 */
 143        __u32   softirq_pending;                /* 0x03a4 */
 144        __s32   preempt_count;                  /* 0x03a8 */
 145        __u32   spinlock_lockval;               /* 0x03ac */
 146        __u32   spinlock_index;                 /* 0x03b0 */
 147        __u32   fpu_flags;                      /* 0x03b4 */
 148        __u64   percpu_offset;                  /* 0x03b8 */
 149        __u8    pad_0x03c0[0x03c8-0x03c0];      /* 0x03c0 */
 150        __u64   machine_flags;                  /* 0x03c8 */
 151        __u64   gmap;                           /* 0x03d0 */
 152        __u8    pad_0x03d8[0x0400-0x03d8];      /* 0x03d8 */
 153
 154        /* br %r1 trampoline */
 155        __u16   br_r1_trampoline;               /* 0x0400 */
 156        __u32   return_lpswe;                   /* 0x0402 */
 157        __u32   return_mcck_lpswe;              /* 0x0406 */
 158        __u8    pad_0x040a[0x0e00-0x040a];      /* 0x040a */
 159
 160        /*
 161         * 0xe00 contains the address of the IPL Parameter Information
 162         * block. Dump tools need IPIB for IPL after dump.
 163         * Note: do not change the position of any fields in 0x0e00-0x0f00
 164         */
 165        __u64   ipib;                           /* 0x0e00 */
 166        __u32   ipib_checksum;                  /* 0x0e08 */
 167        __u64   vmcore_info;                    /* 0x0e0c */
 168        __u8    pad_0x0e14[0x0e18-0x0e14];      /* 0x0e14 */
 169        __u64   os_info;                        /* 0x0e18 */
 170        __u8    pad_0x0e20[0x11b0-0x0e20];      /* 0x0e20 */
 171
 172        /* Pointer to the machine check extended save area */
 173        __u64   mcesad;                         /* 0x11b0 */
 174
 175        /* 64 bit extparam used for pfault/diag 250: defined by architecture */
 176        __u64   ext_params2;                    /* 0x11B8 */
 177        __u8    pad_0x11c0[0x1200-0x11C0];      /* 0x11C0 */
 178
 179        /* CPU register save area: defined by architecture */
 180        __u64   floating_pt_save_area[16];      /* 0x1200 */
 181        __u64   gpregs_save_area[16];           /* 0x1280 */
 182        psw_t   psw_save_area;                  /* 0x1300 */
 183        __u8    pad_0x1310[0x1318-0x1310];      /* 0x1310 */
 184        __u32   prefixreg_save_area;            /* 0x1318 */
 185        __u32   fpt_creg_save_area;             /* 0x131c */
 186        __u8    pad_0x1320[0x1324-0x1320];      /* 0x1320 */
 187        __u32   tod_progreg_save_area;          /* 0x1324 */
 188        __u32   cpu_timer_save_area[2];         /* 0x1328 */
 189        __u32   clock_comp_save_area[2];        /* 0x1330 */
 190        __u8    pad_0x1338[0x1340-0x1338];      /* 0x1338 */
 191        __u32   access_regs_save_area[16];      /* 0x1340 */
 192        __u64   cregs_save_area[16];            /* 0x1380 */
 193        __u8    pad_0x1400[0x1800-0x1400];      /* 0x1400 */
 194
 195        /* Transaction abort diagnostic block */
 196        struct pgm_tdb pgm_tdb;                 /* 0x1800 */
 197        __u8    pad_0x1900[0x2000-0x1900];      /* 0x1900 */
 198} __packed __aligned(8192);
 199
 200#define S390_lowcore (*((struct lowcore *) 0))
 201
 202extern struct lowcore *lowcore_ptr[];
 203
 204static inline void set_prefix(__u32 address)
 205{
 206        asm volatile("spx %0" : : "Q" (address) : "memory");
 207}
 208
 209static inline __u32 store_prefix(void)
 210{
 211        __u32 address;
 212
 213        asm volatile("stpx %0" : "=Q" (address));
 214        return address;
 215}
 216
 217#endif /* _ASM_S390_LOWCORE_H */
 218