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 __ASSEMBLER__
 26
 27struct pgm_tdb {
 28	u64 data[32];
 29};
 30
 31struct 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	__u64	stack_canary;			/* 0x0240 */
104	__u8	pad_0x0248[0x0280-0x0248];	/* 0x0248 */
105	__u64	save_area_restart[1];		/* 0x0280 */
106
107	__u64	pcpu;				/* 0x0288 */
108
109	/* Return psws. */
110	psw_t	return_psw;			/* 0x0290 */
111	psw_t	return_mcck_psw;		/* 0x02a0 */
112
113	__u64	last_break;			/* 0x02b0 */
114
115	/* CPU accounting and timing values. */
116	__u64	sys_enter_timer;		/* 0x02b8 */
117	__u64	mcck_enter_timer;		/* 0x02c0 */
118	__u64	exit_timer;			/* 0x02c8 */
119	__u64	user_timer;			/* 0x02d0 */
120	__u64	guest_timer;			/* 0x02d8 */
121	__u64	system_timer;			/* 0x02e0 */
122	__u64	hardirq_timer;			/* 0x02e8 */
123	__u64	softirq_timer;			/* 0x02f0 */
124	__u64	steal_timer;			/* 0x02f8 */
125	__u64	avg_steal_timer;		/* 0x0300 */
126	__u64	last_update_timer;		/* 0x0308 */
127	__u64	last_update_clock;		/* 0x0310 */
128	__u64	int_clock;			/* 0x0318 */
129	__u8	pad_0x0320[0x0328-0x0320];	/* 0x0320 */
130	__u64	clock_comparator;		/* 0x0328 */
131	__u8	pad_0x0330[0x0340-0x0330];	/* 0x0330 */
132
133	/* Current process. */
134	__u64	current_task;			/* 0x0340 */
135	__u64	kernel_stack;			/* 0x0348 */
136
137	/* Interrupt, DAT-off and restartstack. */
138	__u64	async_stack;			/* 0x0350 */
139	__u64	nodat_stack;			/* 0x0358 */
140	__u64	restart_stack;			/* 0x0360 */
141	__u64	mcck_stack;			/* 0x0368 */
142	/* Restart function and parameter. */
143	__u64	restart_fn;			/* 0x0370 */
144	__u64	restart_data;			/* 0x0378 */
145	__u32	restart_source;			/* 0x0380 */
146	__u32	restart_flags;			/* 0x0384 */
147
148	/* Address space pointer. */
149	struct ctlreg kernel_asce;		/* 0x0388 */
150	struct ctlreg user_asce;		/* 0x0390 */
151
152	/*
153	 * The lpp and current_pid fields form a
154	 * 64-bit value that is set as program
155	 * parameter with the LPP instruction.
156	 */
157	__u32	lpp;				/* 0x0398 */
158	__u32	current_pid;			/* 0x039c */
159
160	/* SMP info area */
161	__u32	cpu_nr;				/* 0x03a0 */
162	__u32	softirq_pending;		/* 0x03a4 */
163	__s32	preempt_count;			/* 0x03a8 */
164	__u32	spinlock_lockval;		/* 0x03ac */
165	__u32	spinlock_index;			/* 0x03b0 */
166	__u8	pad_0x03b4[0x03b8-0x03b4];	/* 0x03b4 */
167	__u64	percpu_offset;			/* 0x03b8 */
168	__u8	pad_0x03c0[0x0400-0x03c0];	/* 0x03c0 */
169
170	__u32	return_lpswe;			/* 0x0400 */
171	__u32	return_mcck_lpswe;		/* 0x0404 */
172	__u8	pad_0x040a[0x0e00-0x0408];	/* 0x0408 */
173
174	/*
175	 * 0xe00 contains the address of the IPL Parameter Information
176	 * block. Dump tools need IPIB for IPL after dump.
177	 * Note: do not change the position of any fields in 0x0e00-0x0f00
178	 */
179	__u64	ipib;				/* 0x0e00 */
180	__u32	ipib_checksum;			/* 0x0e08 */
181	__u64	vmcore_info;			/* 0x0e0c */
182	__u8	pad_0x0e14[0x0e18-0x0e14];	/* 0x0e14 */
183	__u64	os_info;			/* 0x0e18 */
184	__u8	pad_0x0e20[0x11b0-0x0e20];	/* 0x0e20 */
185
186	/* Pointer to the machine check extended save area */
187	__u64	mcesad;				/* 0x11b0 */
188
189	/* 64 bit extparam used for pfault/diag 250: defined by architecture */
190	__u64	ext_params2;			/* 0x11B8 */
191	__u8	pad_0x11c0[0x1200-0x11C0];	/* 0x11C0 */
192
193	/* CPU register save area: defined by architecture */
194	__u64	floating_pt_save_area[16];	/* 0x1200 */
195	__u64	gpregs_save_area[16];		/* 0x1280 */
196	psw_t	psw_save_area;			/* 0x1300 */
197	__u8	pad_0x1310[0x1318-0x1310];	/* 0x1310 */
198	__u32	prefixreg_save_area;		/* 0x1318 */
199	__u32	fpt_creg_save_area;		/* 0x131c */
200	__u8	pad_0x1320[0x1324-0x1320];	/* 0x1320 */
201	__u32	tod_progreg_save_area;		/* 0x1324 */
202	__u32	cpu_timer_save_area[2];		/* 0x1328 */
203	__u32	clock_comp_save_area[2];	/* 0x1330 */
204	__u64	last_break_save_area;		/* 0x1338 */
205	__u32	access_regs_save_area[16];	/* 0x1340 */
206	struct ctlreg cregs_save_area[16];	/* 0x1380 */
207	__u8	pad_0x1400[0x1500-0x1400];	/* 0x1400 */
208	/* Cryptography-counter designation */
209	__u64	ccd;				/* 0x1500 */
210	/* AI-extension counter designation */
211	__u64	aicd;				/* 0x1508 */
212	__u8	pad_0x1510[0x1800-0x1510];	/* 0x1510 */
213
214	/* Transaction abort diagnostic block */
215	struct pgm_tdb pgm_tdb;			/* 0x1800 */
216	__u8	pad_0x1900[0x2000-0x1900];	/* 0x1900 */
217} __packed __aligned(8192);
218
219static __always_inline struct lowcore *get_lowcore(void)
220{
221	struct lowcore *lc;
222
223	if (__is_defined(__DECOMPRESSOR))
224		return NULL;
225	asm_inline(
226		ALTERNATIVE("	lghi	%[lc],0",
227			    "	llilh	%[lc],%[alt]",
228			    ALT_FEATURE(MFEATURE_LOWCORE))
229		: [lc] "=d" (lc)
230		: [alt] "i" (LOWCORE_ALT_ADDRESS >> 16));
231	return lc;
232}
233
234extern struct lowcore *lowcore_ptr[];
235
236static inline void set_prefix(__u32 address)
237{
238	asm volatile("spx %0" : : "Q" (address) : "memory");
239}
240
241#else /* __ASSEMBLER__ */
242
243.macro GET_LC reg
244	ALTERNATIVE "lghi	\reg,0",					\
245		__stringify(llilh	\reg, LOWCORE_ALT_ADDRESS >> 16),	\
246		ALT_FEATURE(MFEATURE_LOWCORE)
247.endm
248
249.macro STMG_LC start, end, savearea
250	ALTERNATIVE "stmg	\start, \end, \savearea",				\
251		__stringify(stmg	\start, \end, LOWCORE_ALT_ADDRESS + \savearea),	\
252		ALT_FEATURE(MFEATURE_LOWCORE)
253.endm
254
255#endif /* __ASSEMBLER__ */
256#endif /* _ASM_S390_LOWCORE_H */