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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/asm-s390/processor.h
3 *
4 * S390 version
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)
8 *
9 * Derived from "include/asm-i386/processor.h"
10 * Copyright (C) 1994, Linus Torvalds
11 */
12
13#ifndef __ASM_S390_PROCESSOR_H
14#define __ASM_S390_PROCESSOR_H
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <asm/ptrace.h>
17
18#ifdef __KERNEL__
19/*
20 * Default implementation of macro that returns current
21 * instruction pointer ("program counter").
22 */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020023#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25/*
26 * CPU type and hardware bug flags. Kept separately for each CPU.
27 * Members of this structure are referenced in head.S, so think twice
28 * before touching them. [mj]
29 */
30
31typedef struct
32{
33 unsigned int version : 8;
34 unsigned int ident : 24;
35 unsigned int machine : 16;
36 unsigned int unused : 16;
37} __attribute__ ((packed)) cpuid_t;
38
Michael Holzheu72960a02007-02-21 10:55:18 +010039static inline void get_cpu_id(cpuid_t *ptr)
40{
41 asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
42}
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044struct cpuinfo_S390
45{
46 cpuid_t cpu_id;
47 __u16 cpu_addr;
48 __u16 cpu_nr;
49 unsigned long loops_per_jiffy;
50 unsigned long *pgd_quick;
51#ifdef __s390x__
52 unsigned long *pmd_quick;
53#endif /* __s390x__ */
54 unsigned long *pte_quick;
55 unsigned long pgtable_cache_sz;
56};
57
Martin Schwidefsky31ee4b22007-02-05 21:18:31 +010058extern void s390_adjust_jiffies(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059extern void print_cpu_info(struct cpuinfo_S390 *);
Heiko Carstens2fc2d1e2007-04-27 16:01:56 +020060extern int get_cpu_capability(unsigned int *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062/*
63 * User space process size: 2GB for 31 bit, 4TB for 64 bit.
64 */
65#ifndef __s390x__
66
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010067#define TASK_SIZE (1UL << 31)
68#define TASK_UNMAPPED_BASE (1UL << 30)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70#else /* __s390x__ */
71
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010072#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
73 (1UL << 31) : (1UL << 53))
74#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
75 (1UL << 30) : (1UL << 41))
76#define TASK_SIZE TASK_SIZE_OF(current)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78#endif /* __s390x__ */
79
David Howells922a70d2008-02-08 04:19:26 -080080#ifdef __KERNEL__
81
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010082#ifndef __s390x__
83#define STACK_TOP (1UL << 31)
Martin Schwidefsky6252d702008-02-09 18:24:37 +010084#define STACK_TOP_MAX (1UL << 31)
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010085#else /* __s390x__ */
Martin Schwidefsky6252d702008-02-09 18:24:37 +010086#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
87#define STACK_TOP_MAX (1UL << 42)
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010088#endif /* __s390x__ */
89
David Howells922a70d2008-02-08 04:19:26 -080090
91#endif
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#define HAVE_ARCH_PICK_MMAP_LAYOUT
94
95typedef struct {
96 __u32 ar4;
97} mm_segment_t;
98
99/*
100 * Thread structure
101 */
102struct thread_struct {
103 s390_fp_regs fp_regs;
104 unsigned int acrs[NUM_ACRS];
105 unsigned long ksp; /* kernel stack pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 mm_segment_t mm_segment;
107 unsigned long prot_addr; /* address of protection-excep. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 unsigned int trap_no;
109 per_struct per_info;
110 /* Used to give failing instruction back to user for ieee exceptions */
111 unsigned long ieee_instruction_pointer;
112 /* pfault_wait is used to block the process on a pfault event */
113 unsigned long pfault_wait;
114};
115
116typedef struct thread_struct thread_struct;
117
118/*
119 * Stack layout of a C stack frame.
120 */
121#ifndef __PACK_STACK
122struct stack_frame {
123 unsigned long back_chain;
124 unsigned long empty1[5];
125 unsigned long gprs[10];
126 unsigned int empty2[8];
127};
128#else
129struct stack_frame {
130 unsigned long empty1[5];
131 unsigned int empty2[8];
132 unsigned long gprs[10];
133 unsigned long back_chain;
134};
135#endif
136
137#define ARCH_MIN_TASKALIGN 8
138
Martin Schwidefsky6f3fa3f2007-10-22 12:52:45 +0200139#define INIT_THREAD { \
140 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
141}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143/*
144 * Do necessary setup to start up a new thread.
145 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#define start_thread(regs, new_psw, new_stackp) do { \
Heiko Carstens9b241cc2007-02-05 21:17:38 +0100147 set_fs(USER_DS); \
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100148 regs->psw.mask = psw_user_bits; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
150 regs->gprs[15] = new_stackp ; \
151} while (0)
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/* Forward declaration, a strange C thing */
154struct task_struct;
155struct mm_struct;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800156struct seq_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158/* Free all resources held by a thread. */
159extern void release_thread(struct task_struct *);
160extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
161
162/* Prepare to copy thread state - unlazy all lazy status */
163#define prepare_to_copy(tsk) do { } while (0)
164
165/*
166 * Return saved PC of a blocked thread.
167 */
168extern unsigned long thread_saved_pc(struct task_struct *t);
169
170/*
171 * Print register of task into buffer. Used in fs/proc/array.c.
172 */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800173extern void task_show_regs(struct seq_file *m, struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Martin Schwidefskybb11e3b2007-04-27 16:01:41 +0200175extern void show_code(struct pt_regs *regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177unsigned long get_wchan(struct task_struct *p);
Al Viroc7584fb2006-01-12 01:05:49 -0800178#define task_pt_regs(tsk) ((struct pt_regs *) \
Al Viro30af7122006-01-12 01:05:50 -0800179 (task_stack_page(tsk) + THREAD_SIZE) - 1)
Al Viroc7584fb2006-01-12 01:05:49 -0800180#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
181#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
183/*
184 * Give up the time slice of the virtual PU.
185 */
Heiko Carstensabdba612006-07-12 16:39:58 +0200186static inline void cpu_relax(void)
187{
188 if (MACHINE_HAS_DIAG44)
Heiko Carstensc48e0912007-02-05 21:17:20 +0100189 asm volatile("diag 0,0,68");
190 barrier();
Heiko Carstensabdba612006-07-12 16:39:58 +0200191}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Heiko Carstensdc74d7f2007-06-19 13:10:06 +0200193static inline void psw_set_key(unsigned int key)
194{
195 asm volatile("spka 0(%0)" : : "d" (key));
196}
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/*
Heiko Carstens77fa2242005-06-25 14:55:30 -0700199 * Set PSW to specified value.
200 */
201static inline void __load_psw(psw_t psw)
202{
203#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200204 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
Heiko Carstens77fa2242005-06-25 14:55:30 -0700205#else
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200206 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
Heiko Carstens77fa2242005-06-25 14:55:30 -0700207#endif
208}
209
210/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * Set PSW mask to specified value, while leaving the
212 * PSW addr pointing to the next instruction.
213 */
214
215static inline void __load_psw_mask (unsigned long mask)
216{
217 unsigned long addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 psw_t psw;
Heiko Carstens77fa2242005-06-25 14:55:30 -0700219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 psw.mask = mask;
221
222#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200223 asm volatile(
224 " basr %0,0\n"
225 "0: ahi %0,1f-0b\n"
226 " st %0,4(%1)\n"
227 " lpsw 0(%1)\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 "1:"
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200229 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230#else /* __s390x__ */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200231 asm volatile(
232 " larl %0,1f\n"
233 " stg %0,8(%1)\n"
234 " lpswe 0(%1)\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 "1:"
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200236 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237#endif /* __s390x__ */
238}
239
240/*
241 * Function to stop a processor until an interruption occurred
242 */
243static inline void enabled_wait(void)
244{
Heiko Carstens77fa2242005-06-25 14:55:30 -0700245 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
246 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
249/*
250 * Function to drop a processor into disabled wait state
251 */
252
253static inline void disabled_wait(unsigned long code)
254{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 unsigned long ctl_buf;
Heiko Carstens77fa2242005-06-25 14:55:30 -0700256 psw_t dw_psw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Heiko Carstens77fa2242005-06-25 14:55:30 -0700258 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
259 dw_psw.addr = code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 /*
261 * Store status and then load disabled wait psw,
262 * the processor is dead afterwards
263 */
264#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200265 asm volatile(
266 " stctl 0,0,0(%2)\n"
267 " ni 0(%2),0xef\n" /* switch off protection */
268 " lctl 0,0,0(%2)\n"
269 " stpt 0xd8\n" /* store timer */
270 " stckc 0xe0\n" /* store clock comparator */
271 " stpx 0x108\n" /* store prefix register */
272 " stam 0,15,0x120\n" /* store access registers */
273 " std 0,0x160\n" /* store f0 */
274 " std 2,0x168\n" /* store f2 */
275 " std 4,0x170\n" /* store f4 */
276 " std 6,0x178\n" /* store f6 */
277 " stm 0,15,0x180\n" /* store general registers */
278 " stctl 0,15,0x1c0\n" /* store control registers */
279 " oi 0x1c0,0x10\n" /* fake protection bit */
280 " lpsw 0(%1)"
281 : "=m" (ctl_buf)
282 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283#else /* __s390x__ */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200284 asm volatile(
285 " stctg 0,0,0(%2)\n"
286 " ni 4(%2),0xef\n" /* switch off protection */
287 " lctlg 0,0,0(%2)\n"
288 " lghi 1,0x1000\n"
289 " stpt 0x328(1)\n" /* store timer */
290 " stckc 0x330(1)\n" /* store clock comparator */
291 " stpx 0x318(1)\n" /* store prefix register */
292 " stam 0,15,0x340(1)\n"/* store access registers */
293 " stfpc 0x31c(1)\n" /* store fpu control */
294 " std 0,0x200(1)\n" /* store f0 */
295 " std 1,0x208(1)\n" /* store f1 */
296 " std 2,0x210(1)\n" /* store f2 */
297 " std 3,0x218(1)\n" /* store f3 */
298 " std 4,0x220(1)\n" /* store f4 */
299 " std 5,0x228(1)\n" /* store f5 */
300 " std 6,0x230(1)\n" /* store f6 */
301 " std 7,0x238(1)\n" /* store f7 */
302 " std 8,0x240(1)\n" /* store f8 */
303 " std 9,0x248(1)\n" /* store f9 */
304 " std 10,0x250(1)\n" /* store f10 */
305 " std 11,0x258(1)\n" /* store f11 */
306 " std 12,0x260(1)\n" /* store f12 */
307 " std 13,0x268(1)\n" /* store f13 */
308 " std 14,0x270(1)\n" /* store f14 */
309 " std 15,0x278(1)\n" /* store f15 */
310 " stmg 0,15,0x280(1)\n"/* store general registers */
311 " stctg 0,15,0x380(1)\n"/* store control registers */
312 " oi 0x384(1),0x10\n"/* fake protection bit */
313 " lpswe 0(%1)"
314 : "=m" (ctl_buf)
315 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316#endif /* __s390x__ */
317}
318
319/*
Heiko Carstensab14de62007-02-05 21:18:37 +0100320 * Basic Machine Check/Program Check Handler.
321 */
322
323extern void s390_base_mcck_handler(void);
324extern void s390_base_pgm_handler(void);
325extern void s390_base_ext_handler(void);
326
327extern void (*s390_base_mcck_handler_fn)(void);
328extern void (*s390_base_pgm_handler_fn)(void);
329extern void (*s390_base_ext_handler_fn)(void);
330
331/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 * CPU idle notifier chain.
333 */
Heiko Carstensdce55472007-07-10 11:24:21 +0200334#define S390_CPU_IDLE 0
335#define S390_CPU_NOT_IDLE 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337struct notifier_block;
338int register_idle_notifier(struct notifier_block *nb);
339int unregister_idle_notifier(struct notifier_block *nb);
340
Heiko Carstensdfd54cb2006-09-25 23:31:33 -0700341#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343#endif
344
Martin Schwidefskyde1a3f12006-09-20 15:58:20 +0200345/*
346 * Helper macro for exception table entries
347 */
348#ifndef __s390x__
349#define EX_TABLE(_fault,_target) \
350 ".section __ex_table,\"a\"\n" \
351 " .align 4\n" \
352 " .long " #_fault "," #_target "\n" \
353 ".previous\n"
354#else
355#define EX_TABLE(_fault,_target) \
356 ".section __ex_table,\"a\"\n" \
357 " .align 8\n" \
358 " .quad " #_fault "," #_target "\n" \
359 ".previous\n"
360#endif
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362#endif /* __ASM_S390_PROCESSOR_H */