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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
Heiko Carstensedd53782008-12-25 13:39:16 +010016#include <linux/linkage.h>
Christian Ehrhardt25097bf2009-04-14 15:36:16 +020017#include <asm/cpuid.h>
18#include <asm/page.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/ptrace.h>
Christian Ehrhardt25097bf2009-04-14 15:36:16 +020020#include <asm/setup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#ifdef __KERNEL__
23/*
24 * Default implementation of macro that returns current
25 * instruction pointer ("program counter").
26 */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +020027#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Michael Holzheu72960a02007-02-21 10:55:18 +010029static inline void get_cpu_id(cpuid_t *ptr)
30{
31 asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
32}
33
Martin Schwidefsky31ee4b22007-02-05 21:18:31 +010034extern void s390_adjust_jiffies(void);
Martin Schwidefsky7b468482009-03-26 15:24:42 +010035extern void print_cpu_info(void);
Heiko Carstens2fc2d1e2007-04-27 16:01:56 +020036extern int get_cpu_capability(unsigned int *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/*
Martin Schwidefskyf481bfa2009-03-18 13:27:36 +010039 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 */
41#ifndef __s390x__
42
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010043#define TASK_SIZE (1UL << 31)
44#define TASK_UNMAPPED_BASE (1UL << 30)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#else /* __s390x__ */
47
Martin Schwidefskyf481bfa2009-03-18 13:27:36 +010048#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010049#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
50 (1UL << 30) : (1UL << 41))
51#define TASK_SIZE TASK_SIZE_OF(current)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53#endif /* __s390x__ */
54
David Howells922a70d2008-02-08 04:19:26 -080055#ifdef __KERNEL__
56
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010057#ifndef __s390x__
58#define STACK_TOP (1UL << 31)
Martin Schwidefsky6252d702008-02-09 18:24:37 +010059#define STACK_TOP_MAX (1UL << 31)
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010060#else /* __s390x__ */
Martin Schwidefsky6252d702008-02-09 18:24:37 +010061#define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
62#define STACK_TOP_MAX (1UL << 42)
Martin Schwidefsky5a216a22008-02-09 18:24:36 +010063#endif /* __s390x__ */
64
David Howells922a70d2008-02-08 04:19:26 -080065
66#endif
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#define HAVE_ARCH_PICK_MMAP_LAYOUT
69
70typedef struct {
71 __u32 ar4;
72} mm_segment_t;
73
74/*
75 * Thread structure
76 */
77struct thread_struct {
78 s390_fp_regs fp_regs;
79 unsigned int acrs[NUM_ACRS];
80 unsigned long ksp; /* kernel stack pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 mm_segment_t mm_segment;
82 unsigned long prot_addr; /* address of protection-excep. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 unsigned int trap_no;
84 per_struct per_info;
85 /* Used to give failing instruction back to user for ieee exceptions */
86 unsigned long ieee_instruction_pointer;
87 /* pfault_wait is used to block the process on a pfault event */
88 unsigned long pfault_wait;
89};
90
91typedef struct thread_struct thread_struct;
92
93/*
94 * Stack layout of a C stack frame.
95 */
96#ifndef __PACK_STACK
97struct stack_frame {
98 unsigned long back_chain;
99 unsigned long empty1[5];
100 unsigned long gprs[10];
101 unsigned int empty2[8];
102};
103#else
104struct stack_frame {
105 unsigned long empty1[5];
106 unsigned int empty2[8];
107 unsigned long gprs[10];
108 unsigned long back_chain;
109};
110#endif
111
112#define ARCH_MIN_TASKALIGN 8
113
Martin Schwidefsky6f3fa3f2007-10-22 12:52:45 +0200114#define INIT_THREAD { \
115 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
116}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118/*
119 * Do necessary setup to start up a new thread.
120 */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200121#define start_thread(regs, new_psw, new_stackp) do { \
Heiko Carstens9b241cc2007-02-05 21:17:38 +0100122 set_fs(USER_DS); \
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100123 regs->psw.mask = psw_user_bits; \
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200124 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
125 regs->gprs[15] = new_stackp; \
126} while (0)
127
128#define start_thread31(regs, new_psw, new_stackp) do { \
129 set_fs(USER_DS); \
130 regs->psw.mask = psw_user32_bits; \
131 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
132 regs->gprs[15] = new_stackp; \
133 crst_table_downgrade(current->mm, 1UL << 31); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134} while (0)
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136/* Forward declaration, a strange C thing */
137struct task_struct;
138struct mm_struct;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800139struct seq_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141/* Free all resources held by a thread. */
142extern void release_thread(struct task_struct *);
143extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
144
145/* Prepare to copy thread state - unlazy all lazy status */
146#define prepare_to_copy(tsk) do { } while (0)
147
148/*
149 * Return saved PC of a blocked thread.
150 */
151extern unsigned long thread_saved_pc(struct task_struct *t);
152
153/*
154 * Print register of task into buffer. Used in fs/proc/array.c.
155 */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -0800156extern void task_show_regs(struct seq_file *m, struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Martin Schwidefskybb11e3b2007-04-27 16:01:41 +0200158extern void show_code(struct pt_regs *regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160unsigned long get_wchan(struct task_struct *p);
Al Viroc7584fb2006-01-12 01:05:49 -0800161#define task_pt_regs(tsk) ((struct pt_regs *) \
Al Viro30af7122006-01-12 01:05:50 -0800162 (task_stack_page(tsk) + THREAD_SIZE) - 1)
Al Viroc7584fb2006-01-12 01:05:49 -0800163#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
164#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166/*
167 * Give up the time slice of the virtual PU.
168 */
Heiko Carstensabdba612006-07-12 16:39:58 +0200169static inline void cpu_relax(void)
170{
171 if (MACHINE_HAS_DIAG44)
Heiko Carstensc48e0912007-02-05 21:17:20 +0100172 asm volatile("diag 0,0,68");
173 barrier();
Heiko Carstensabdba612006-07-12 16:39:58 +0200174}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Heiko Carstensdc74d7f2007-06-19 13:10:06 +0200176static inline void psw_set_key(unsigned int key)
177{
178 asm volatile("spka 0(%0)" : : "d" (key));
179}
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/*
Heiko Carstens77fa2242005-06-25 14:55:30 -0700182 * Set PSW to specified value.
183 */
184static inline void __load_psw(psw_t psw)
185{
186#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200187 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
Heiko Carstens77fa2242005-06-25 14:55:30 -0700188#else
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200189 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
Heiko Carstens77fa2242005-06-25 14:55:30 -0700190#endif
191}
192
193/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 * Set PSW mask to specified value, while leaving the
195 * PSW addr pointing to the next instruction.
196 */
197
198static inline void __load_psw_mask (unsigned long mask)
199{
200 unsigned long addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 psw_t psw;
Heiko Carstens77fa2242005-06-25 14:55:30 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 psw.mask = mask;
204
205#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200206 asm volatile(
207 " basr %0,0\n"
208 "0: ahi %0,1f-0b\n"
209 " st %0,4(%1)\n"
210 " lpsw 0(%1)\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 "1:"
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200212 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213#else /* __s390x__ */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200214 asm volatile(
215 " larl %0,1f\n"
216 " stg %0,8(%1)\n"
217 " lpswe 0(%1)\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 "1:"
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200219 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220#endif /* __s390x__ */
221}
222
223/*
224 * Function to stop a processor until an interruption occurred
225 */
226static inline void enabled_wait(void)
227{
Heiko Carstens77fa2242005-06-25 14:55:30 -0700228 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
229 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/*
233 * Function to drop a processor into disabled wait state
234 */
235
Heiko Carstensedd53782008-12-25 13:39:16 +0100236static inline void ATTRIB_NORET disabled_wait(unsigned long code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 unsigned long ctl_buf;
Heiko Carstens77fa2242005-06-25 14:55:30 -0700239 psw_t dw_psw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Heiko Carstens77fa2242005-06-25 14:55:30 -0700241 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
242 dw_psw.addr = code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 /*
244 * Store status and then load disabled wait psw,
245 * the processor is dead afterwards
246 */
247#ifndef __s390x__
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200248 asm volatile(
249 " stctl 0,0,0(%2)\n"
250 " ni 0(%2),0xef\n" /* switch off protection */
251 " lctl 0,0,0(%2)\n"
252 " stpt 0xd8\n" /* store timer */
253 " stckc 0xe0\n" /* store clock comparator */
254 " stpx 0x108\n" /* store prefix register */
255 " stam 0,15,0x120\n" /* store access registers */
256 " std 0,0x160\n" /* store f0 */
257 " std 2,0x168\n" /* store f2 */
258 " std 4,0x170\n" /* store f4 */
259 " std 6,0x178\n" /* store f6 */
260 " stm 0,15,0x180\n" /* store general registers */
261 " stctl 0,15,0x1c0\n" /* store control registers */
262 " oi 0x1c0,0x10\n" /* fake protection bit */
263 " lpsw 0(%1)"
264 : "=m" (ctl_buf)
265 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266#else /* __s390x__ */
Martin Schwidefsky94c12cc2006-09-28 16:56:43 +0200267 asm volatile(
268 " stctg 0,0,0(%2)\n"
269 " ni 4(%2),0xef\n" /* switch off protection */
270 " lctlg 0,0,0(%2)\n"
271 " lghi 1,0x1000\n"
272 " stpt 0x328(1)\n" /* store timer */
273 " stckc 0x330(1)\n" /* store clock comparator */
274 " stpx 0x318(1)\n" /* store prefix register */
275 " stam 0,15,0x340(1)\n"/* store access registers */
276 " stfpc 0x31c(1)\n" /* store fpu control */
277 " std 0,0x200(1)\n" /* store f0 */
278 " std 1,0x208(1)\n" /* store f1 */
279 " std 2,0x210(1)\n" /* store f2 */
280 " std 3,0x218(1)\n" /* store f3 */
281 " std 4,0x220(1)\n" /* store f4 */
282 " std 5,0x228(1)\n" /* store f5 */
283 " std 6,0x230(1)\n" /* store f6 */
284 " std 7,0x238(1)\n" /* store f7 */
285 " std 8,0x240(1)\n" /* store f8 */
286 " std 9,0x248(1)\n" /* store f9 */
287 " std 10,0x250(1)\n" /* store f10 */
288 " std 11,0x258(1)\n" /* store f11 */
289 " std 12,0x260(1)\n" /* store f12 */
290 " std 13,0x268(1)\n" /* store f13 */
291 " std 14,0x270(1)\n" /* store f14 */
292 " std 15,0x278(1)\n" /* store f15 */
293 " stmg 0,15,0x280(1)\n"/* store general registers */
294 " stctg 0,15,0x380(1)\n"/* store control registers */
295 " oi 0x384(1),0x10\n"/* fake protection bit */
296 " lpswe 0(%1)"
297 : "=m" (ctl_buf)
298 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299#endif /* __s390x__ */
Heiko Carstensedd53782008-12-25 13:39:16 +0100300 while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303/*
Heiko Carstensab14de62007-02-05 21:18:37 +0100304 * Basic Machine Check/Program Check Handler.
305 */
306
307extern void s390_base_mcck_handler(void);
308extern void s390_base_pgm_handler(void);
309extern void s390_base_ext_handler(void);
310
311extern void (*s390_base_mcck_handler_fn)(void);
312extern void (*s390_base_pgm_handler_fn)(void);
313extern void (*s390_base_ext_handler_fn)(void);
314
Heiko Carstensdfd54cb2006-09-25 23:31:33 -0700315#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317#endif
318
Martin Schwidefskyde1a3f12006-09-20 15:58:20 +0200319/*
320 * Helper macro for exception table entries
321 */
322#ifndef __s390x__
323#define EX_TABLE(_fault,_target) \
324 ".section __ex_table,\"a\"\n" \
325 " .align 4\n" \
326 " .long " #_fault "," #_target "\n" \
327 ".previous\n"
328#else
329#define EX_TABLE(_fault,_target) \
330 ".section __ex_table,\"a\"\n" \
331 " .align 8\n" \
332 " .quad " #_fault "," #_target "\n" \
333 ".previous\n"
334#endif
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336#endif /* __ASM_S390_PROCESSOR_H */