summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/processor.h
blob: 14883b1562e0ffe425e3fe2a62774794c419921a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/processor.h"
 *    Copyright (C) 1994, Linus Torvalds
 */

#ifndef __ASM_S390_PROCESSOR_H
#define __ASM_S390_PROCESSOR_H

#include <linux/const.h>

#define CIF_MCCK_PENDING	0	/* machine check handling is pending */
#define CIF_ASCE_PRIMARY	1	/* primary asce needs fixup / uaccess */
#define CIF_ASCE_SECONDARY	2	/* secondary asce needs fixup / uaccess */
#define CIF_NOHZ_DELAY		3	/* delay HZ disable for a tick */
#define CIF_FPU			4	/* restore FPU registers */
#define CIF_IGNORE_IRQ		5	/* ignore interrupt (for udelay) */
#define CIF_ENABLED_WAIT	6	/* in enabled wait state */
#define CIF_MCCK_GUEST		7	/* machine check happening in guest */
#define CIF_DEDICATED_CPU	8	/* this CPU is dedicated */

#define _CIF_MCCK_PENDING	_BITUL(CIF_MCCK_PENDING)
#define _CIF_ASCE_PRIMARY	_BITUL(CIF_ASCE_PRIMARY)
#define _CIF_ASCE_SECONDARY	_BITUL(CIF_ASCE_SECONDARY)
#define _CIF_NOHZ_DELAY		_BITUL(CIF_NOHZ_DELAY)
#define _CIF_FPU		_BITUL(CIF_FPU)
#define _CIF_IGNORE_IRQ		_BITUL(CIF_IGNORE_IRQ)
#define _CIF_ENABLED_WAIT	_BITUL(CIF_ENABLED_WAIT)
#define _CIF_MCCK_GUEST		_BITUL(CIF_MCCK_GUEST)
#define _CIF_DEDICATED_CPU	_BITUL(CIF_DEDICATED_CPU)

#ifndef __ASSEMBLY__

#include <linux/cpumask.h>
#include <linux/linkage.h>
#include <linux/irqflags.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/runtime_instr.h>
#include <asm/fpu/types.h>
#include <asm/fpu/internal.h>

static inline void set_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags |= (1UL << flag);
}

static inline void clear_cpu_flag(int flag)
{
	S390_lowcore.cpu_flags &= ~(1UL << flag);
}

static inline int test_cpu_flag(int flag)
{
	return !!(S390_lowcore.cpu_flags & (1UL << flag));
}

/*
 * Test CIF flag of another CPU. The caller needs to ensure that
 * CPU hotplug can not happen, e.g. by disabling preemption.
 */
static inline int test_cpu_flag_of(int flag, int cpu)
{
	struct lowcore *lc = lowcore_ptr[cpu];
	return !!(lc->cpu_flags & (1UL << flag));
}

#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)

static inline void get_cpu_id(struct cpuid *ptr)
{
	asm volatile("stidp %0" : "=Q" (*ptr));
}

void s390_adjust_jiffies(void);
void s390_update_cpu_mhz(void);
void cpu_detect_mhz_feature(void);

extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;
extern void execve_tail(void);
extern void __bpon(void);

/*
 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
 */

#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_31BIT) ? \
					(1UL << 31) : -PAGE_SIZE)
#define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_31BIT) ? \
					(1UL << 30) : (1UL << 41))
#define TASK_SIZE		TASK_SIZE_OF(current)
#define TASK_SIZE_MAX		(-PAGE_SIZE)

#define STACK_TOP		(test_thread_flag(TIF_31BIT) ? \
					(1UL << 31) : (1UL << 42))
#define STACK_TOP_MAX		(1UL << 42)

#define HAVE_ARCH_PICK_MMAP_LAYOUT

typedef unsigned int mm_segment_t;

/*
 * Thread structure
 */
struct thread_struct {
	unsigned int  acrs[NUM_ACRS];
        unsigned long ksp;              /* kernel stack pointer             */
	unsigned long user_timer;	/* task cputime in user space */
	unsigned long guest_timer;	/* task cputime in kvm guest */
	unsigned long system_timer;	/* task cputime in kernel space */
	unsigned long hardirq_timer;	/* task cputime in hardirq context */
	unsigned long softirq_timer;	/* task cputime in softirq context */
	unsigned long sys_call_table;	/* system call table address */
	mm_segment_t mm_segment;
	unsigned long gmap_addr;	/* address of last gmap fault. */
	unsigned int gmap_write_flag;	/* gmap fault write indication */
	unsigned int gmap_int_code;	/* int code of last gmap fault */
	unsigned int gmap_pfault;	/* signal of a pending guest pfault */
	/* Per-thread information related to debugging */
	struct per_regs per_user;	/* User specified PER registers */
	struct per_event per_event;	/* Cause of the last PER trap */
	unsigned long per_flags;	/* Flags to control debug behavior */
	unsigned int system_call;	/* system call number in signal */
	unsigned long last_break;	/* last breaking-event-address. */
        /* pfault_wait is used to block the process on a pfault event */
	unsigned long pfault_wait;
	struct list_head list;
	/* cpu runtime instrumentation */
	struct runtime_instr_cb *ri_cb;
	struct gs_cb *gs_cb;		/* Current guarded storage cb */
	struct gs_cb *gs_bc_cb;		/* Broadcast guarded storage cb */
	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
	/*
	 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
	 * the end.
	 */
	struct fpu fpu;			/* FP and VX register save area */
};

/* Flag to disable transactions. */
#define PER_FLAG_NO_TE			1UL
/* Flag to enable random transaction aborts. */
#define PER_FLAG_TE_ABORT_RAND		2UL
/* Flag to specify random transaction abort mode:
 * - abort each transaction at a random instruction before TEND if set.
 * - abort random transactions at a random instruction if cleared.
 */
#define PER_FLAG_TE_ABORT_RAND_TEND	4UL

typedef struct thread_struct thread_struct;

#define ARCH_MIN_TASKALIGN	8

#define INIT_THREAD {							\
	.ksp = sizeof(init_stack) + (unsigned long) &init_stack,	\
	.fpu.regs = (void *) init_task.thread.fpu.fprs,			\
}

/*
 * Do necessary setup to start up a new thread.
 */
#define start_thread(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;	\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	execve_tail();							\
} while (0)

#define start_thread31(regs, new_psw, new_stackp) do {			\
	regs->psw.mask	= PSW_USER_BITS | PSW_MASK_BA;			\
	regs->psw.addr	= new_psw;					\
	regs->gprs[15]	= new_stackp;					\
	crst_table_downgrade(current->mm);				\
	execve_tail();							\
} while (0)

/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
struct seq_file;
struct pt_regs;

void show_registers(struct pt_regs *regs);
void show_cacheinfo(struct seq_file *m);

/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *tsk) { }

/* Free guarded storage control block */
void guarded_storage_release(struct task_struct *tsk);

unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \
        (task_stack_page(tsk) + THREAD_SIZE) - 1)
#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)
#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15])

/* Has task runtime instrumentation enabled ? */
#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)

static inline unsigned long current_stack_pointer(void)
{
	unsigned long sp;

	asm volatile("la %0,0(15)" : "=a" (sp));
	return sp;
}

static __no_kasan_or_inline unsigned short stap(void)
{
	unsigned short cpu_address;

	asm volatile("stap %0" : "=Q" (cpu_address));
	return cpu_address;
}

#define cpu_relax() barrier()

#define ECAG_CACHE_ATTRIBUTE	0
#define ECAG_CPU_ATTRIBUTE	1

static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
{
	unsigned long val;

	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
		     : "=d" (val) : "a" (asi << 8 | parm));
	return val;
}

static inline void psw_set_key(unsigned int key)
{
	asm volatile("spka 0(%0)" : : "d" (key));
}

/*
 * Set PSW to specified value.
 */
static inline void __load_psw(psw_t psw)
{
	asm volatile("lpswe %0" : : "Q" (psw) : "cc");
}

/*
 * Set PSW mask to specified value, while leaving the
 * PSW addr pointing to the next instruction.
 */
static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
{
	unsigned long addr;
	psw_t psw;

	psw.mask = mask;

	asm volatile(
		"	larl	%0,1f\n"
		"	stg	%0,%1\n"
		"	lpswe	%2\n"
		"1:"
		: "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc");
}

/*
 * Extract current PSW mask
 */
static inline unsigned long __extract_psw(void)
{
	unsigned int reg1, reg2;

	asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
	return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
}

static inline void local_mcck_enable(void)
{
	__load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
}

static inline void local_mcck_disable(void)
{
	__load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
}

/*
 * Rewind PSW instruction address by specified number of bytes.
 */
static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
{
	unsigned long mask;

	mask = (psw.mask & PSW_MASK_EA) ? -1UL :
	       (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
					  (1UL << 24) - 1;
	return (psw.addr - ilc) & mask;
}

/*
 * Function to stop a processor until the next interrupt occurs
 */
void enabled_wait(void);

/*
 * Function to drop a processor into disabled wait state
 */
static inline void __noreturn disabled_wait(void)
{
	psw_t psw;

	psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
	psw.addr = _THIS_IP_;
	__load_psw(psw);
	while (1);
}

/*
 * Basic Machine Check/Program Check Handler.
 */

extern void s390_base_mcck_handler(void);
extern void s390_base_pgm_handler(void);
extern void s390_base_ext_handler(void);

extern void (*s390_base_mcck_handler_fn)(void);
extern void (*s390_base_pgm_handler_fn)(void);
extern void (*s390_base_ext_handler_fn)(void);

#define ARCH_LOW_ADDRESS_LIMIT	0x7fffffffUL

extern int memcpy_real(void *, void *, size_t);
extern void memcpy_absolute(void *, void *, size_t);

#define mem_assign_absolute(dest, val) do {			\
	__typeof__(dest) __tmp = (val);				\
								\
	BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));		\
	memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));	\
} while (0)

extern int s390_isolate_bp(void);
extern int s390_isolate_bp_guest(void);

#endif /* __ASSEMBLY__ */

#endif /* __ASM_S390_PROCESSOR_H */