/* 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/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 __ASSEMBLY__

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 */
	__u8	pad_0x0240[0x0280-0x0240];	/* 0x0240 */
	__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 */
	__u64	boot_clock[2];			/* 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[0x03c8-0x03c0];	/* 0x03c0 */
	__u64	machine_flags;			/* 0x03c8 */
	__u64	gmap;				/* 0x03d0 */
	__u8	pad_0x03d8[0x0400-0x03d8];	/* 0x03d8 */

	__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(ALTERNATIVE("llilh %[lc],0", "llilh %[lc],%[alt]", ALT_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 /* __ASSEMBLY__ */

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

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

#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_LOWCORE_H */