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/tod_types.h>
14 #include <asm/machine.h>
15 #include <asm/ptrace.h>
16 #include <asm/ctlreg.h>
17 #include <asm/cpu.h>
18 #include <asm/types.h>
19 #include <asm/alternative.h>
20
21 #define LC_ORDER 1
22 #define LC_PAGES 2
23
24 #define LOWCORE_ALT_ADDRESS 0x70000
25
26 #ifndef __ASSEMBLER__
27
28 struct pgm_tdb {
29 u64 data[32];
30 };
31
32 struct lowcore {
33 __u8 pad_0x0000[0x0014-0x0000]; /* 0x0000 */
34 __u32 ipl_parmblock_ptr; /* 0x0014 */
35 __u8 pad_0x0018[0x0080-0x0018]; /* 0x0018 */
36 __u32 ext_params; /* 0x0080 */
37 union {
38 struct {
39 __u16 ext_cpu_addr; /* 0x0084 */
40 __u16 ext_int_code; /* 0x0086 */
41 };
42 __u32 ext_int_code_addr;
43 };
44 __u32 svc_int_code; /* 0x0088 */
45 union {
46 struct {
47 __u16 pgm_ilc; /* 0x008c */
48 __u16 pgm_code; /* 0x008e */
49 };
50 __u32 pgm_int_code;
51 };
52 __u32 data_exc_code; /* 0x0090 */
53 __u16 mon_class_num; /* 0x0094 */
54 union {
55 struct {
56 __u8 per_code; /* 0x0096 */
57 __u8 per_atmid; /* 0x0097 */
58 };
59 __u16 per_code_combined;
60 };
61 __u64 per_address; /* 0x0098 */
62 __u8 exc_access_id; /* 0x00a0 */
63 __u8 per_access_id; /* 0x00a1 */
64 __u8 op_access_id; /* 0x00a2 */
65 __u8 ar_mode_id; /* 0x00a3 */
66 __u8 pad_0x00a4[0x00a8-0x00a4]; /* 0x00a4 */
67 __u64 trans_exc_code; /* 0x00a8 */
68 __u64 monitor_code; /* 0x00b0 */
69 union {
70 struct {
71 __u16 subchannel_id; /* 0x00b8 */
72 __u16 subchannel_nr; /* 0x00ba */
73 __u32 io_int_parm; /* 0x00bc */
74 __u32 io_int_word; /* 0x00c0 */
75 };
76 struct tpi_info tpi_info; /* 0x00b8 */
77 };
78 __u8 pad_0x00c4[0x00c8-0x00c4]; /* 0x00c4 */
79 __u32 stfl_fac_list; /* 0x00c8 */
80 __u8 pad_0x00cc[0x00e8-0x00cc]; /* 0x00cc */
81 __u64 mcck_interruption_code; /* 0x00e8 */
82 __u8 pad_0x00f0[0x00f4-0x00f0]; /* 0x00f0 */
83 __u32 external_damage_code; /* 0x00f4 */
84 __u64 failing_storage_address; /* 0x00f8 */
85 __u8 pad_0x0100[0x0110-0x0100]; /* 0x0100 */
86 __u64 pgm_last_break; /* 0x0110 */
87 __u8 pad_0x0118[0x0120-0x0118]; /* 0x0118 */
88 psw_t restart_old_psw; /* 0x0120 */
89 psw_t external_old_psw; /* 0x0130 */
90 psw_t svc_old_psw; /* 0x0140 */
91 psw_t program_old_psw; /* 0x0150 */
92 psw_t mcck_old_psw; /* 0x0160 */
93 psw_t io_old_psw; /* 0x0170 */
94 __u8 pad_0x0180[0x01a0-0x0180]; /* 0x0180 */
95 psw_t restart_psw; /* 0x01a0 */
96 psw_t external_new_psw; /* 0x01b0 */
97 psw_t svc_new_psw; /* 0x01c0 */
98 psw_t program_new_psw; /* 0x01d0 */
99 psw_t mcck_new_psw; /* 0x01e0 */
100 psw_t io_new_psw; /* 0x01f0 */
101
102 /* Save areas. */
103 __u64 save_area[8]; /* 0x0200 */
104 __u64 stack_canary; /* 0x0240 */
105 __u8 pad_0x0248[0x0280-0x0248]; /* 0x0248 */
106 __u64 save_area_restart[1]; /* 0x0280 */
107
108 __u64 pcpu; /* 0x0288 */
109
110 /* Return psws. */
111 psw_t return_psw; /* 0x0290 */
112 psw_t return_mcck_psw; /* 0x02a0 */
113
114 __u64 last_break; /* 0x02b0 */
115
116 /* CPU accounting and timing values. */
117 __u64 sys_enter_timer; /* 0x02b8 */
118 __u64 mcck_enter_timer; /* 0x02c0 */
119 __u64 exit_timer; /* 0x02c8 */
120 __u64 user_timer; /* 0x02d0 */
121 __u64 guest_timer; /* 0x02d8 */
122 __u64 system_timer; /* 0x02e0 */
123 __u64 hardirq_timer; /* 0x02e8 */
124 __u64 softirq_timer; /* 0x02f0 */
125 __u64 steal_timer; /* 0x02f8 */
126 __u64 avg_steal_timer; /* 0x0300 */
127 __u64 last_update_timer; /* 0x0308 */
128 __u64 last_update_clock; /* 0x0310 */
129 union tod_clock int_clock; /* 0x0318 */
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 union {
164 struct {
165 __u32 need_resched; /* 0x03a8 */
166 __u32 count; /* 0x03ac */
167 } preempt;
168 __u64 preempt_count; /* 0x03a8 */
169 };
170 __u32 spinlock_lockval; /* 0x03b0 */
171 __u32 spinlock_index; /* 0x03b4 */
172 __u64 percpu_offset; /* 0x03b8 */
173 __u8 percpu_register; /* 0x03c0 */
174 __u8 pad_0x03c1[0x0400-0x03c1]; /* 0x03c1 */
175
176 __u32 return_lpswe; /* 0x0400 */
177 __u32 return_mcck_lpswe; /* 0x0404 */
178 __u8 pad_0x040a[0x0e00-0x0408]; /* 0x0408 */
179
180 /*
181 * 0xe00 contains the address of the IPL Parameter Information
182 * block. Dump tools need IPIB for IPL after dump.
183 * Note: do not change the position of any fields in 0x0e00-0x0f00
184 */
185 __u64 ipib; /* 0x0e00 */
186 __u32 ipib_checksum; /* 0x0e08 */
187 __u64 vmcore_info; /* 0x0e0c */
188 __u8 pad_0x0e14[0x0e18-0x0e14]; /* 0x0e14 */
189 __u64 os_info; /* 0x0e18 */
190 __u8 pad_0x0e20[0x11b0-0x0e20]; /* 0x0e20 */
191
192 /* Pointer to the machine check extended save area */
193 __u64 mcesad; /* 0x11b0 */
194
195 /* 64 bit extparam used for pfault/diag 250: defined by architecture */
196 __u64 ext_params2; /* 0x11B8 */
197 __u8 pad_0x11c0[0x1200-0x11C0]; /* 0x11C0 */
198
199 /* CPU register save area: defined by architecture */
200 __u64 floating_pt_save_area[16]; /* 0x1200 */
201 __u64 gpregs_save_area[16]; /* 0x1280 */
202 psw_t psw_save_area; /* 0x1300 */
203 __u8 pad_0x1310[0x1318-0x1310]; /* 0x1310 */
204 __u32 prefixreg_save_area; /* 0x1318 */
205 __u32 fpt_creg_save_area; /* 0x131c */
206 __u8 pad_0x1320[0x1324-0x1320]; /* 0x1320 */
207 __u32 tod_progreg_save_area; /* 0x1324 */
208 __u32 cpu_timer_save_area[2]; /* 0x1328 */
209 __u32 clock_comp_save_area[2]; /* 0x1330 */
210 __u64 last_break_save_area; /* 0x1338 */
211 __u32 access_regs_save_area[16]; /* 0x1340 */
212 struct ctlreg cregs_save_area[16]; /* 0x1380 */
213 __u8 pad_0x1400[0x1500-0x1400]; /* 0x1400 */
214 /* Cryptography-counter designation */
215 __u64 ccd; /* 0x1500 */
216 /* AI-extension counter designation */
217 __u64 aicd; /* 0x1508 */
218 __u8 pad_0x1510[0x1800-0x1510]; /* 0x1510 */
219
220 /* Transaction abort diagnostic block */
221 struct pgm_tdb pgm_tdb; /* 0x1800 */
222 __u8 pad_0x1900[0x2000-0x1900]; /* 0x1900 */
223 } __packed __aligned(8192);
224
225 #define LC_PERCPU_OFFSET offsetof(struct lowcore, percpu_offset)
226 #define LC_PERCPU_REGISTER offsetof(struct lowcore, percpu_register)
227
get_lowcore(void)228 static __always_inline struct lowcore *get_lowcore(void)
229 {
230 struct lowcore *lc;
231
232 if (__is_defined(__DECOMPRESSOR))
233 return NULL;
234 asm_inline(
235 ALTERNATIVE(" lghi %[lc],0",
236 " llilh %[lc],%[alt]",
237 ALT_FEATURE(MFEATURE_LOWCORE))
238 : [lc] "=d" (lc)
239 : [alt] "i" (LOWCORE_ALT_ADDRESS >> 16));
240 return lc;
241 }
242
243 extern struct lowcore *lowcore_ptr[];
244
set_prefix(__u32 address)245 static inline void set_prefix(__u32 address)
246 {
247 asm volatile("spx %0" : : "Q" (address) : "memory");
248 }
249
250 #else /* __ASSEMBLER__ */
251
252 .macro GET_LC reg
253 ALTERNATIVE "lghi \reg,0", \
254 __stringify(llilh \reg, LOWCORE_ALT_ADDRESS >> 16), \
255 ALT_FEATURE(MFEATURE_LOWCORE)
256 .endm
257
258 .macro STMG_LC start, end, savearea
259 ALTERNATIVE "stmg \start, \end, \savearea", \
260 __stringify(stmg \start, \end, LOWCORE_ALT_ADDRESS + \savearea), \
261 ALT_FEATURE(MFEATURE_LOWCORE)
262 .endm
263
264 #endif /* __ASSEMBLER__ */
265 #endif /* _ASM_S390_LOWCORE_H */
266