/* SPDX-License-Identifier: GPL-2.0 */
/*
 *    Copyright IBM Corp. 1999, 2012
 *    Author(s): Hartmut Penner <hp@de.ibm.com>,
 *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
 *               Denis Joseph Barrow,
 */

#ifndef _ASM_S390_LOWCORE_H
#define _ASM_S390_LOWCORE_H

#include <linux/types.h>
#include <asm/machine.h>
#include <asm/ptrace.h>
#include <asm/ctlreg.h>
#include <asm/cpu.h>
#include <asm/types.h>
#include <asm/alternative.h>

#define LC_ORDER 1
#define LC_PAGES 2

#define LOWCORE_ALT_ADDRESS     _AC(0x70000, UL)

#ifndef __ASSEMBLER__

struct pgm_tdb {
        u64 data[32];
};

struct lowcore {
        __u8    pad_0x0000[0x0014-0x0000];      /* 0x0000 */
        __u32   ipl_parmblock_ptr;              /* 0x0014 */
        __u8    pad_0x0018[0x0080-0x0018];      /* 0x0018 */
        __u32   ext_params;                     /* 0x0080 */
        union {
                struct {
                        __u16 ext_cpu_addr;     /* 0x0084 */
                        __u16 ext_int_code;     /* 0x0086 */
                };
                __u32 ext_int_code_addr;
        };
        __u32   svc_int_code;                   /* 0x0088 */
        union {
                struct {
                        __u16   pgm_ilc;        /* 0x008c */
                        __u16   pgm_code;       /* 0x008e */
                };
                __u32 pgm_int_code;
        };
        __u32   data_exc_code;                  /* 0x0090 */
        __u16   mon_class_num;                  /* 0x0094 */
        union {
                struct {
                        __u8    per_code;       /* 0x0096 */
                        __u8    per_atmid;      /* 0x0097 */
                };
                __u16 per_code_combined;
        };
        __u64   per_address;                    /* 0x0098 */
        __u8    exc_access_id;                  /* 0x00a0 */
        __u8    per_access_id;                  /* 0x00a1 */
        __u8    op_access_id;                   /* 0x00a2 */
        __u8    ar_mode_id;                     /* 0x00a3 */
        __u8    pad_0x00a4[0x00a8-0x00a4];      /* 0x00a4 */
        __u64   trans_exc_code;                 /* 0x00a8 */
        __u64   monitor_code;                   /* 0x00b0 */
        union {
                struct {
                        __u16   subchannel_id;  /* 0x00b8 */
                        __u16   subchannel_nr;  /* 0x00ba */
                        __u32   io_int_parm;    /* 0x00bc */
                        __u32   io_int_word;    /* 0x00c0 */
                };
                struct tpi_info tpi_info;       /* 0x00b8 */
        };
        __u8    pad_0x00c4[0x00c8-0x00c4];      /* 0x00c4 */
        __u32   stfl_fac_list;                  /* 0x00c8 */
        __u8    pad_0x00cc[0x00e8-0x00cc];      /* 0x00cc */
        __u64   mcck_interruption_code;         /* 0x00e8 */
        __u8    pad_0x00f0[0x00f4-0x00f0];      /* 0x00f0 */
        __u32   external_damage_code;           /* 0x00f4 */
        __u64   failing_storage_address;        /* 0x00f8 */
        __u8    pad_0x0100[0x0110-0x0100];      /* 0x0100 */
        __u64   pgm_last_break;                 /* 0x0110 */
        __u8    pad_0x0118[0x0120-0x0118];      /* 0x0118 */
        psw_t   restart_old_psw;                /* 0x0120 */
        psw_t   external_old_psw;               /* 0x0130 */
        psw_t   svc_old_psw;                    /* 0x0140 */
        psw_t   program_old_psw;                /* 0x0150 */
        psw_t   mcck_old_psw;                   /* 0x0160 */
        psw_t   io_old_psw;                     /* 0x0170 */
        __u8    pad_0x0180[0x01a0-0x0180];      /* 0x0180 */
        psw_t   restart_psw;                    /* 0x01a0 */
        psw_t   external_new_psw;               /* 0x01b0 */
        psw_t   svc_new_psw;                    /* 0x01c0 */
        psw_t   program_new_psw;                /* 0x01d0 */
        psw_t   mcck_new_psw;                   /* 0x01e0 */
        psw_t   io_new_psw;                     /* 0x01f0 */

        /* Save areas. */
        __u64   save_area[8];                   /* 0x0200 */
        __u64   stack_canary;                   /* 0x0240 */
        __u8    pad_0x0248[0x0280-0x0248];      /* 0x0248 */
        __u64   save_area_restart[1];           /* 0x0280 */

        __u64   pcpu;                           /* 0x0288 */

        /* Return psws. */
        psw_t   return_psw;                     /* 0x0290 */
        psw_t   return_mcck_psw;                /* 0x02a0 */

        __u64   last_break;                     /* 0x02b0 */

        /* CPU accounting and timing values. */
        __u64   sys_enter_timer;                /* 0x02b8 */
        __u64   mcck_enter_timer;               /* 0x02c0 */
        __u64   exit_timer;                     /* 0x02c8 */
        __u64   user_timer;                     /* 0x02d0 */
        __u64   guest_timer;                    /* 0x02d8 */
        __u64   system_timer;                   /* 0x02e0 */
        __u64   hardirq_timer;                  /* 0x02e8 */
        __u64   softirq_timer;                  /* 0x02f0 */
        __u64   steal_timer;                    /* 0x02f8 */
        __u64   avg_steal_timer;                /* 0x0300 */
        __u64   last_update_timer;              /* 0x0308 */
        __u64   last_update_clock;              /* 0x0310 */
        __u64   int_clock;                      /* 0x0318 */
        __u8    pad_0x0320[0x0328-0x0320];      /* 0x0320 */
        __u64   clock_comparator;               /* 0x0328 */
        __u8    pad_0x0330[0x0340-0x0330];      /* 0x0330 */

        /* Current process. */
        __u64   current_task;                   /* 0x0340 */
        __u64   kernel_stack;                   /* 0x0348 */

        /* Interrupt, DAT-off and restartstack. */
        __u64   async_stack;                    /* 0x0350 */
        __u64   nodat_stack;                    /* 0x0358 */
        __u64   restart_stack;                  /* 0x0360 */
        __u64   mcck_stack;                     /* 0x0368 */
        /* Restart function and parameter. */
        __u64   restart_fn;                     /* 0x0370 */
        __u64   restart_data;                   /* 0x0378 */
        __u32   restart_source;                 /* 0x0380 */
        __u32   restart_flags;                  /* 0x0384 */

        /* Address space pointer. */
        struct ctlreg kernel_asce;              /* 0x0388 */
        struct ctlreg user_asce;                /* 0x0390 */

        /*
         * The lpp and current_pid fields form a
         * 64-bit value that is set as program
         * parameter with the LPP instruction.
         */
        __u32   lpp;                            /* 0x0398 */
        __u32   current_pid;                    /* 0x039c */

        /* SMP info area */
        __u32   cpu_nr;                         /* 0x03a0 */
        __u32   softirq_pending;                /* 0x03a4 */
        __s32   preempt_count;                  /* 0x03a8 */
        __u32   spinlock_lockval;               /* 0x03ac */
        __u32   spinlock_index;                 /* 0x03b0 */
        __u8    pad_0x03b4[0x03b8-0x03b4];      /* 0x03b4 */
        __u64   percpu_offset;                  /* 0x03b8 */
        __u8    pad_0x03c0[0x0400-0x03c0];      /* 0x03c0 */

        __u32   return_lpswe;                   /* 0x0400 */
        __u32   return_mcck_lpswe;              /* 0x0404 */
        __u8    pad_0x040a[0x0e00-0x0408];      /* 0x0408 */

        /*
         * 0xe00 contains the address of the IPL Parameter Information
         * block. Dump tools need IPIB for IPL after dump.
         * Note: do not change the position of any fields in 0x0e00-0x0f00
         */
        __u64   ipib;                           /* 0x0e00 */
        __u32   ipib_checksum;                  /* 0x0e08 */
        __u64   vmcore_info;                    /* 0x0e0c */
        __u8    pad_0x0e14[0x0e18-0x0e14];      /* 0x0e14 */
        __u64   os_info;                        /* 0x0e18 */
        __u8    pad_0x0e20[0x11b0-0x0e20];      /* 0x0e20 */

        /* Pointer to the machine check extended save area */
        __u64   mcesad;                         /* 0x11b0 */

        /* 64 bit extparam used for pfault/diag 250: defined by architecture */
        __u64   ext_params2;                    /* 0x11B8 */
        __u8    pad_0x11c0[0x1200-0x11C0];      /* 0x11C0 */

        /* CPU register save area: defined by architecture */
        __u64   floating_pt_save_area[16];      /* 0x1200 */
        __u64   gpregs_save_area[16];           /* 0x1280 */
        psw_t   psw_save_area;                  /* 0x1300 */
        __u8    pad_0x1310[0x1318-0x1310];      /* 0x1310 */
        __u32   prefixreg_save_area;            /* 0x1318 */
        __u32   fpt_creg_save_area;             /* 0x131c */
        __u8    pad_0x1320[0x1324-0x1320];      /* 0x1320 */
        __u32   tod_progreg_save_area;          /* 0x1324 */
        __u32   cpu_timer_save_area[2];         /* 0x1328 */
        __u32   clock_comp_save_area[2];        /* 0x1330 */
        __u64   last_break_save_area;           /* 0x1338 */
        __u32   access_regs_save_area[16];      /* 0x1340 */
        struct ctlreg cregs_save_area[16];      /* 0x1380 */
        __u8    pad_0x1400[0x1500-0x1400];      /* 0x1400 */
        /* Cryptography-counter designation */
        __u64   ccd;                            /* 0x1500 */
        /* AI-extension counter designation */
        __u64   aicd;                           /* 0x1508 */
        __u8    pad_0x1510[0x1800-0x1510];      /* 0x1510 */

        /* Transaction abort diagnostic block */
        struct pgm_tdb pgm_tdb;                 /* 0x1800 */
        __u8    pad_0x1900[0x2000-0x1900];      /* 0x1900 */
} __packed __aligned(8192);

static __always_inline struct lowcore *get_lowcore(void)
{
        struct lowcore *lc;

        if (__is_defined(__DECOMPRESSOR))
                return NULL;
        asm_inline(
                ALTERNATIVE("   lghi    %[lc],0",
                            "   llilh   %[lc],%[alt]",
                            ALT_FEATURE(MFEATURE_LOWCORE))
                : [lc] "=d" (lc)
                : [alt] "i" (LOWCORE_ALT_ADDRESS >> 16));
        return lc;
}

extern struct lowcore *lowcore_ptr[];

static inline void set_prefix(__u32 address)
{
        asm volatile("spx %0" : : "Q" (address) : "memory");
}

#else /* __ASSEMBLER__ */

.macro GET_LC reg
        ALTERNATIVE "lghi       \reg,0",                                        \
                __stringify(llilh       \reg, LOWCORE_ALT_ADDRESS >> 16),       \
                ALT_FEATURE(MFEATURE_LOWCORE)
.endm

.macro STMG_LC start, end, savearea
        ALTERNATIVE "stmg       \start, \end, \savearea",                               \
                __stringify(stmg        \start, \end, LOWCORE_ALT_ADDRESS + \savearea), \
                ALT_FEATURE(MFEATURE_LOWCORE)
.endm

#endif /* __ASSEMBLER__ */
#endif /* _ASM_S390_LOWCORE_H */