2 * include/asm-s390/processor.h
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Derived from "include/asm-i386/processor.h"
10 * Copyright (C) 1994, Linus Torvalds
13 #ifndef __ASM_S390_PROCESSOR_H
14 #define __ASM_S390_PROCESSOR_H
16 #include <linux/linkage.h>
17 #include <linux/irqflags.h>
20 #include <asm/ptrace.h>
21 #include <asm/setup.h>
25 * Default implementation of macro that returns current
26 * instruction pointer ("program counter").
28 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
30 static inline void get_cpu_id(struct cpuid
*ptr
)
32 asm volatile("stidp %0" : "=Q" (*ptr
));
35 extern void s390_adjust_jiffies(void);
36 extern int get_cpu_capability(unsigned int *);
37 extern const struct seq_operations cpuinfo_op
;
38 extern int sysctl_ieee_emulation_warnings
;
41 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
45 #define TASK_SIZE (1UL << 31)
46 #define TASK_UNMAPPED_BASE (1UL << 30)
50 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
51 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
52 (1UL << 30) : (1UL << 41))
53 #define TASK_SIZE TASK_SIZE_OF(current)
55 #endif /* __s390x__ */
60 #define STACK_TOP (1UL << 31)
61 #define STACK_TOP_MAX (1UL << 31)
63 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
64 #define STACK_TOP_MAX (1UL << 42)
65 #endif /* __s390x__ */
70 #define HAVE_ARCH_PICK_MMAP_LAYOUT
79 struct thread_struct
{
81 unsigned int acrs
[NUM_ACRS
];
82 unsigned long ksp
; /* kernel stack pointer */
83 mm_segment_t mm_segment
;
84 unsigned long gmap_addr
; /* address of last gmap fault. */
85 struct per_regs per_user
; /* User specified PER registers */
86 struct per_event per_event
; /* Cause of the last PER trap */
87 /* pfault_wait is used to block the process on a pfault event */
88 unsigned long pfault_wait
;
89 struct list_head list
;
92 typedef struct thread_struct thread_struct
;
95 * Stack layout of a C stack frame.
99 unsigned long back_chain
;
100 unsigned long empty1
[5];
101 unsigned long gprs
[10];
102 unsigned int empty2
[8];
106 unsigned long empty1
[5];
107 unsigned int empty2
[8];
108 unsigned long gprs
[10];
109 unsigned long back_chain
;
113 #define ARCH_MIN_TASKALIGN 8
115 #define INIT_THREAD { \
116 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
120 * Do necessary setup to start up a new thread.
122 #define start_thread(regs, new_psw, new_stackp) do { \
123 regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
124 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
125 regs->gprs[15] = new_stackp; \
128 #define start_thread31(regs, new_psw, new_stackp) do { \
129 regs->psw.mask = psw_user_bits | PSW_MASK_BA; \
130 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
131 regs->gprs[15] = new_stackp; \
132 crst_table_downgrade(current->mm, 1UL << 31); \
135 /* Forward declaration, a strange C thing */
140 /* Free all resources held by a thread. */
141 extern void release_thread(struct task_struct
*);
142 extern int kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
);
144 /* Prepare to copy thread state - unlazy all lazy status */
145 #define prepare_to_copy(tsk) do { } while (0)
148 * Return saved PC of a blocked thread.
150 extern unsigned long thread_saved_pc(struct task_struct
*t
);
152 extern void show_code(struct pt_regs
*regs
);
154 unsigned long get_wchan(struct task_struct
*p
);
155 #define task_pt_regs(tsk) ((struct pt_regs *) \
156 (task_stack_page(tsk) + THREAD_SIZE) - 1)
157 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
158 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
160 static inline unsigned short stap(void)
162 unsigned short cpu_address
;
164 asm volatile("stap %0" : "=m" (cpu_address
));
169 * Give up the time slice of the virtual PU.
171 static inline void cpu_relax(void)
173 if (MACHINE_HAS_DIAG44
)
174 asm volatile("diag 0,0,68");
178 static inline void psw_set_key(unsigned int key
)
180 asm volatile("spka 0(%0)" : : "d" (key
));
184 * Set PSW to specified value.
186 static inline void __load_psw(psw_t psw
)
189 asm volatile("lpsw %0" : : "Q" (psw
) : "cc");
191 asm volatile("lpswe %0" : : "Q" (psw
) : "cc");
196 * Set PSW mask to specified value, while leaving the
197 * PSW addr pointing to the next instruction.
199 static inline void __load_psw_mask (unsigned long mask
)
210 " st %0,%O1+4(%R1)\n"
213 : "=&d" (addr
), "=Q" (psw
) : "Q" (psw
) : "memory", "cc");
214 #else /* __s390x__ */
217 " stg %0,%O1+8(%R1)\n"
220 : "=&d" (addr
), "=Q" (psw
) : "Q" (psw
) : "memory", "cc");
221 #endif /* __s390x__ */
225 * Rewind PSW instruction address by specified number of bytes.
227 static inline unsigned long __rewind_psw(psw_t psw
, unsigned long ilc
)
230 if (psw
.addr
& PSW_ADDR_AMODE
)
232 return (psw
.addr
- ilc
) | PSW_ADDR_AMODE
;
234 return (psw
.addr
- ilc
) & ((1UL << 24) - 1);
238 mask
= (psw
.mask
& PSW_MASK_EA
) ? -1UL :
239 (psw
.mask
& PSW_MASK_BA
) ? (1UL << 31) - 1 :
241 return (psw
.addr
- ilc
) & mask
;
246 * Function to drop a processor into disabled wait state
248 static inline void __noreturn
disabled_wait(unsigned long code
)
250 unsigned long ctl_buf
;
253 dw_psw
.mask
= PSW_MASK_BASE
| PSW_MASK_WAIT
| PSW_MASK_BA
| PSW_MASK_EA
;
256 * Store status and then load disabled wait psw,
257 * the processor is dead afterwards
262 " ni 0(%2),0xef\n" /* switch off protection */
264 " stpt 0xd8\n" /* store timer */
265 " stckc 0xe0\n" /* store clock comparator */
266 " stpx 0x108\n" /* store prefix register */
267 " stam 0,15,0x120\n" /* store access registers */
268 " std 0,0x160\n" /* store f0 */
269 " std 2,0x168\n" /* store f2 */
270 " std 4,0x170\n" /* store f4 */
271 " std 6,0x178\n" /* store f6 */
272 " stm 0,15,0x180\n" /* store general registers */
273 " stctl 0,15,0x1c0\n" /* store control registers */
274 " oi 0x1c0,0x10\n" /* fake protection bit */
277 : "a" (&dw_psw
), "a" (&ctl_buf
), "m" (dw_psw
) : "cc");
278 #else /* __s390x__ */
281 " ni 4(%2),0xef\n" /* switch off protection */
284 " stpt 0x328(1)\n" /* store timer */
285 " stckc 0x330(1)\n" /* store clock comparator */
286 " stpx 0x318(1)\n" /* store prefix register */
287 " stam 0,15,0x340(1)\n"/* store access registers */
288 " stfpc 0x31c(1)\n" /* store fpu control */
289 " std 0,0x200(1)\n" /* store f0 */
290 " std 1,0x208(1)\n" /* store f1 */
291 " std 2,0x210(1)\n" /* store f2 */
292 " std 3,0x218(1)\n" /* store f3 */
293 " std 4,0x220(1)\n" /* store f4 */
294 " std 5,0x228(1)\n" /* store f5 */
295 " std 6,0x230(1)\n" /* store f6 */
296 " std 7,0x238(1)\n" /* store f7 */
297 " std 8,0x240(1)\n" /* store f8 */
298 " std 9,0x248(1)\n" /* store f9 */
299 " std 10,0x250(1)\n" /* store f10 */
300 " std 11,0x258(1)\n" /* store f11 */
301 " std 12,0x260(1)\n" /* store f12 */
302 " std 13,0x268(1)\n" /* store f13 */
303 " std 14,0x270(1)\n" /* store f14 */
304 " std 15,0x278(1)\n" /* store f15 */
305 " stmg 0,15,0x280(1)\n"/* store general registers */
306 " stctg 0,15,0x380(1)\n"/* store control registers */
307 " oi 0x384(1),0x10\n"/* fake protection bit */
310 : "a" (&dw_psw
), "a" (&ctl_buf
), "m" (dw_psw
) : "cc", "0", "1");
311 #endif /* __s390x__ */
316 * Use to set psw mask except for the first byte which
317 * won't be changed by this function.
320 __set_psw_mask(unsigned long mask
)
322 __load_psw_mask(mask
| (arch_local_save_flags() & ~(-1UL >> 8)));
325 #define local_mcck_enable() \
326 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
327 #define local_mcck_disable() \
328 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)
331 * Basic Machine Check/Program Check Handler.
334 extern void s390_base_mcck_handler(void);
335 extern void s390_base_pgm_handler(void);
336 extern void s390_base_ext_handler(void);
338 extern void (*s390_base_mcck_handler_fn
)(void);
339 extern void (*s390_base_pgm_handler_fn
)(void);
340 extern void (*s390_base_ext_handler_fn
)(void);
342 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
347 * Helper macro for exception table entries
350 #define EX_TABLE(_fault,_target) \
351 ".section __ex_table,\"a\"\n" \
353 " .long " #_fault "," #_target "\n" \
356 #define EX_TABLE(_fault,_target) \
357 ".section __ex_table,\"a\"\n" \
359 " .quad " #_fault "," #_target "\n" \
363 #endif /* __ASM_S390_PROCESSOR_H */