arch/s390/include/asm/lowcore.h

   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/machine.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/ctlreg.h>
  16 #include <asm/cpu.h>
  17 #include <asm/types.h>
  18 #include <asm/alternative.h>
  19
  20 #define LC_ORDER 1
  21 #define LC_PAGES 2
  22
  23 #define LOWCORE_ALT_ADDRESS     _AC(0x70000, UL)
  24
  25 #ifndef __ASSEMBLY__
  26
  27 struct pgm_tdb {
  28         u64 data[32];
  29 };
  30
  31 struct lowcore {
  32         __u8    pad_0x0000[0x0014-0x0000];      /* 0x0000 */
  33         __u32   ipl_parmblock_ptr;              /* 0x0014 */
  34         __u8    pad_0x0018[0x0080-0x0018];      /* 0x0018 */
  35         __u32   ext_params;                     /* 0x0080 */
  36         union {
  37                 struct {
  38                         __u16 ext_cpu_addr;     /* 0x0084 */
  39                         __u16 ext_int_code;     /* 0x0086 */
  40                 };
  41                 __u32 ext_int_code_addr;
  42         };
  43         __u32   svc_int_code;                   /* 0x0088 */
  44         union {
  45                 struct {
  46                         __u16   pgm_ilc;        /* 0x008c */
  47                         __u16   pgm_code;       /* 0x008e */
  48                 };
  49                 __u32 pgm_int_code;
  50         };
  51         __u32   data_exc_code;                  /* 0x0090 */
  52         __u16   mon_class_num;                  /* 0x0094 */
  53         union {
  54                 struct {
  55                         __u8    per_code;       /* 0x0096 */
  56                         __u8    per_atmid;      /* 0x0097 */
  57                 };
  58                 __u16 per_code_combined;
  59         };
  60         __u64   per_address;                    /* 0x0098 */
  61         __u8    exc_access_id;                  /* 0x00a0 */
  62         __u8    per_access_id;                  /* 0x00a1 */
  63         __u8    op_access_id;                   /* 0x00a2 */
  64         __u8    ar_mode_id;                     /* 0x00a3 */
  65         __u8    pad_0x00a4[0x00a8-0x00a4];      /* 0x00a4 */
  66         __u64   trans_exc_code;                 /* 0x00a8 */
  67         __u64   monitor_code;                   /* 0x00b0 */
  68         union {
  69                 struct {
  70                         __u16   subchannel_id;  /* 0x00b8 */
  71                         __u16   subchannel_nr;  /* 0x00ba */
  72                         __u32   io_int_parm;    /* 0x00bc */
  73                         __u32   io_int_word;    /* 0x00c0 */
  74                 };
  75                 struct tpi_info tpi_info;       /* 0x00b8 */
  76         };
  77         __u8    pad_0x00c4[0x00c8-0x00c4];      /* 0x00c4 */
  78         __u32   stfl_fac_list;                  /* 0x00c8 */
  79         __u8    pad_0x00cc[0x00e8-0x00cc];      /* 0x00cc */
  80         __u64   mcck_interruption_code;         /* 0x00e8 */
  81         __u8    pad_0x00f0[0x00f4-0x00f0];      /* 0x00f0 */
  82         __u32   external_damage_code;           /* 0x00f4 */
  83         __u64   failing_storage_address;        /* 0x00f8 */
  84         __u8    pad_0x0100[0x0110-0x0100];      /* 0x0100 */
  85         __u64   pgm_last_break;                 /* 0x0110 */
  86         __u8    pad_0x0118[0x0120-0x0118];      /* 0x0118 */
  87         psw_t   restart_old_psw;                /* 0x0120 */
  88         psw_t   external_old_psw;               /* 0x0130 */
  89         psw_t   svc_old_psw;                    /* 0x0140 */
  90         psw_t   program_old_psw;                /* 0x0150 */
  91         psw_t   mcck_old_psw;                   /* 0x0160 */
  92         psw_t   io_old_psw;                     /* 0x0170 */
  93         __u8    pad_0x0180[0x01a0-0x0180];      /* 0x0180 */
  94         psw_t   restart_psw;                    /* 0x01a0 */
  95         psw_t   external_new_psw;               /* 0x01b0 */
  96         psw_t   svc_new_psw;                    /* 0x01c0 */
  97         psw_t   program_new_psw;                /* 0x01d0 */
  98         psw_t   mcck_new_psw;                   /* 0x01e0 */
  99         psw_t   io_new_psw;                     /* 0x01f0 */
 100
 101         /* Save areas. */
 102         __u64   save_area[8];                   /* 0x0200 */
 103         __u8    pad_0x0240[0x0280-0x0240];      /* 0x0240 */
 104         __u64   save_area_restart[1];           /* 0x0280 */
 105
 106         __u64   pcpu;                           /* 0x0288 */
 107
 108         /* Return psws. */
 109         psw_t   return_psw;                     /* 0x0290 */
 110         psw_t   return_mcck_psw;                /* 0x02a0 */
 111
 112         __u64   last_break;                     /* 0x02b0 */
 113
 114         /* CPU accounting and timing values. */
 115         __u64   sys_enter_timer;                /* 0x02b8 */
 116         __u64   mcck_enter_timer;               /* 0x02c0 */
 117         __u64   exit_timer;                     /* 0x02c8 */
 118         __u64   user_timer;                     /* 0x02d0 */
 119         __u64   guest_timer;                    /* 0x02d8 */
 120         __u64   system_timer;                   /* 0x02e0 */
 121         __u64   hardirq_timer;                  /* 0x02e8 */
 122         __u64   softirq_timer;                  /* 0x02f0 */
 123         __u64   steal_timer;                    /* 0x02f8 */
 124         __u64   avg_steal_timer;                /* 0x0300 */
 125         __u64   last_update_timer;              /* 0x0308 */
 126         __u64   last_update_clock;              /* 0x0310 */
 127         __u64   int_clock;                      /* 0x0318 */
 128         __u8    pad_0x0320[0x0328-0x0320];      /* 0x0320 */
 129         __u64   clock_comparator;               /* 0x0328 */
 130         __u8    pad_0x0330[0x0340-0x0330];      /* 0x0330 */
 131
 132         /* Current process. */
 133         __u64   current_task;                   /* 0x0340 */
 134         __u64   kernel_stack;                   /* 0x0348 */
 135
 136         /* Interrupt, DAT-off and restartstack. */
 137         __u64   async_stack;                    /* 0x0350 */
 138         __u64   nodat_stack;                    /* 0x0358 */
 139         __u64   restart_stack;                  /* 0x0360 */
 140         __u64   mcck_stack;                     /* 0x0368 */
 141         /* Restart function and parameter. */
 142         __u64   restart_fn;                     /* 0x0370 */
 143         __u64   restart_data;                   /* 0x0378 */
 144         __u32   restart_source;                 /* 0x0380 */
 145         __u32   restart_flags;                  /* 0x0384 */
 146
 147         /* Address space pointer. */
 148         struct ctlreg kernel_asce;              /* 0x0388 */
 149         struct ctlreg user_asce;                /* 0x0390 */
 150
 151         /*
 152          * The lpp and current_pid fields form a
 153          * 64-bit value that is set as program
 154          * parameter with the LPP instruction.
 155          */
 156         __u32   lpp;                            /* 0x0398 */
 157         __u32   current_pid;                    /* 0x039c */
 158
 159         /* SMP info area */
 160         __u32   cpu_nr;                         /* 0x03a0 */
 161         __u32   softirq_pending;                /* 0x03a4 */
 162         __s32   preempt_count;                  /* 0x03a8 */
 163         __u32   spinlock_lockval;               /* 0x03ac */
 164         __u32   spinlock_index;                 /* 0x03b0 */
 165         __u8    pad_0x03b4[0x03b8-0x03b4];      /* 0x03b4 */
 166         __u64   percpu_offset;                  /* 0x03b8 */
 167         __u8    pad_0x03c0[0x0400-0x03c0];      /* 0x03c0 */
 168
 169         __u32   return_lpswe;                   /* 0x0400 */
 170         __u32   return_mcck_lpswe;              /* 0x0404 */
 171         __u8    pad_0x040a[0x0e00-0x0408];      /* 0x0408 */
 172
 173         /*
 174          * 0xe00 contains the address of the IPL Parameter Information
 175          * block. Dump tools need IPIB for IPL after dump.
 176          * Note: do not change the position of any fields in 0x0e00-0x0f00
 177          */
 178         __u64   ipib;                           /* 0x0e00 */
 179         __u32   ipib_checksum;                  /* 0x0e08 */
 180         __u64   vmcore_info;                    /* 0x0e0c */
 181         __u8    pad_0x0e14[0x0e18-0x0e14];      /* 0x0e14 */
 182         __u64   os_info;                        /* 0x0e18 */
 183         __u8    pad_0x0e20[0x11b0-0x0e20];      /* 0x0e20 */
 184
 185         /* Pointer to the machine check extended save area */
 186         __u64   mcesad;                         /* 0x11b0 */
 187
 188         /* 64 bit extparam used for pfault/diag 250: defined by architecture */
 189         __u64   ext_params2;                    /* 0x11B8 */
 190         __u8    pad_0x11c0[0x1200-0x11C0];      /* 0x11C0 */
 191
 192         /* CPU register save area: defined by architecture */
 193         __u64   floating_pt_save_area[16];      /* 0x1200 */
 194         __u64   gpregs_save_area[16];           /* 0x1280 */
 195         psw_t   psw_save_area;                  /* 0x1300 */
 196         __u8    pad_0x1310[0x1318-0x1310];      /* 0x1310 */
 197         __u32   prefixreg_save_area;            /* 0x1318 */
 198         __u32   fpt_creg_save_area;             /* 0x131c */
 199         __u8    pad_0x1320[0x1324-0x1320];      /* 0x1320 */
 200         __u32   tod_progreg_save_area;          /* 0x1324 */
 201         __u32   cpu_timer_save_area[2];         /* 0x1328 */
 202         __u32   clock_comp_save_area[2];        /* 0x1330 */
 203         __u64   last_break_save_area;           /* 0x1338 */
 204         __u32   access_regs_save_area[16];      /* 0x1340 */
 205         struct ctlreg cregs_save_area[16];      /* 0x1380 */
 206         __u8    pad_0x1400[0x1500-0x1400];      /* 0x1400 */
 207         /* Cryptography-counter designation */
 208         __u64   ccd;                            /* 0x1500 */
 209         /* AI-extension counter designation */
 210         __u64   aicd;                           /* 0x1508 */
 211         __u8    pad_0x1510[0x1800-0x1510];      /* 0x1510 */
 212
 213         /* Transaction abort diagnostic block */
 214         struct pgm_tdb pgm_tdb;                 /* 0x1800 */
 215         __u8    pad_0x1900[0x2000-0x1900];      /* 0x1900 */
 216 } __packed __aligned(8192);
 217
 218 static __always_inline struct lowcore *get_lowcore(void)
 219 {
 220         struct lowcore *lc;
 221
 222         if (__is_defined(__DECOMPRESSOR))
 223                 return NULL;
 224         asm_inline(
 225                 ALTERNATIVE("   lghi    %[lc],0",
 226                             "   llilh   %[lc],%[alt]",
 227                             ALT_FEATURE(MFEATURE_LOWCORE))
 228                 : [lc] "=d" (lc)
 229                 : [alt] "i" (LOWCORE_ALT_ADDRESS >> 16));
 230         return lc;
 231 }
 232
 233 extern struct lowcore *lowcore_ptr[];
 234
 235 static inline void set_prefix(__u32 address)
 236 {
 237         asm volatile("spx %0" : : "Q" (address) : "memory");
 238 }
 239
 240 #else /* __ASSEMBLY__ */
 241
 242 .macro GET_LC reg
 243         ALTERNATIVE "lghi       \reg,0",                                        \
 244                 __stringify(llilh       \reg, LOWCORE_ALT_ADDRESS >> 16),       \
 245                 ALT_FEATURE(MFEATURE_LOWCORE)
 246 .endm
 247
 248 .macro STMG_LC start, end, savearea
 249         ALTERNATIVE "stmg       \start, \end, \savearea",                               \
 250                 __stringify(stmg        \start, \end, LOWCORE_ALT_ADDRESS + \savearea), \
 251                 ALT_FEATURE(MFEATURE_LOWCORE)
 252 .endm
 253
 254 #endif /* __ASSEMBLY__ */
 255 #endif /* _ASM_S390_LOWCORE_H */