1 /*
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
16 #include <linux/linkage.h>
17 #include <linux/irqflags.h>
18 #include <asm/cpu.h>
19 #include <asm/page.h>
20 #include <asm/ptrace.h>
21 #include <asm/setup.h>
22
23 #ifdef __KERNEL__
24 /*
25 * Default implementation of macro that returns current
26 * instruction pointer ("program counter").
27 */
28 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
29
get_cpu_id(struct cpuid * ptr)30 static inline void get_cpu_id(struct cpuid *ptr)
31 {
32 asm volatile("stidp %0" : "=Q" (*ptr));
33 }
34
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;
39
40 /*
41 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
42 */
43 #ifndef __s390x__
44
45 #define TASK_SIZE (1UL << 31)
46 #define TASK_UNMAPPED_BASE (1UL << 30)
47
48 #else /* __s390x__ */
49
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)
54
55 #endif /* __s390x__ */
56
57 #ifdef __KERNEL__
58
59 #ifndef __s390x__
60 #define STACK_TOP (1UL << 31)
61 #define STACK_TOP_MAX (1UL << 31)
62 #else /* __s390x__ */
63 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
64 #define STACK_TOP_MAX (1UL << 42)
65 #endif /* __s390x__ */
66
67
68 #endif
69
70 #define HAVE_ARCH_PICK_MMAP_LAYOUT
71
72 typedef struct {
73 __u32 ar4;
74 } mm_segment_t;
75
76 /*
77 * Thread structure
78 */
79 struct thread_struct {
80 s390_fp_regs fp_regs;
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;
90 };
91
92 typedef struct thread_struct thread_struct;
93
94 /*
95 * Stack layout of a C stack frame.
96 */
97 #ifndef __PACK_STACK
98 struct stack_frame {
99 unsigned long back_chain;
100 unsigned long empty1[5];
101 unsigned long gprs[10];
102 unsigned int empty2[8];
103 };
104 #else
105 struct stack_frame {
106 unsigned long empty1[5];
107 unsigned int empty2[8];
108 unsigned long gprs[10];
109 unsigned long back_chain;
110 };
111 #endif
112
113 #define ARCH_MIN_TASKALIGN 8
114
115 #define INIT_THREAD { \
116 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
117 }
118
119 /*
120 * Do necessary setup to start up a new thread.
121 */
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; \
126 } while (0)
127
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 __tlb_flush_mm(current->mm); \
133 crst_table_downgrade(current->mm, 1UL << 31); \
134 update_mm(current->mm, current); \
135 } while (0)
136
137 /* Forward declaration, a strange C thing */
138 struct task_struct;
139 struct mm_struct;
140 struct seq_file;
141
142 /* Free all resources held by a thread. */
143 extern void release_thread(struct task_struct *);
144 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
145
146 /* Prepare to copy thread state - unlazy all lazy status */
147 #define prepare_to_copy(tsk) do { } while (0)
148
149 /*
150 * Return saved PC of a blocked thread.
151 */
152 extern unsigned long thread_saved_pc(struct task_struct *t);
153
154 extern void show_code(struct pt_regs *regs);
155
156 unsigned long get_wchan(struct task_struct *p);
157 #define task_pt_regs(tsk) ((struct pt_regs *) \
158 (task_stack_page(tsk) + THREAD_SIZE) - 1)
159 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
160 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
161
stap(void)162 static inline unsigned short stap(void)
163 {
164 unsigned short cpu_address;
165
166 asm volatile("stap %0" : "=m" (cpu_address));
167 return cpu_address;
168 }
169
170 /*
171 * Give up the time slice of the virtual PU.
172 */
cpu_relax(void)173 static inline void cpu_relax(void)
174 {
175 if (MACHINE_HAS_DIAG44)
176 asm volatile("diag 0,0,68");
177 barrier();
178 }
179
psw_set_key(unsigned int key)180 static inline void psw_set_key(unsigned int key)
181 {
182 asm volatile("spka 0(%0)" : : "d" (key));
183 }
184
185 /*
186 * Set PSW to specified value.
187 */
__load_psw(psw_t psw)188 static inline void __load_psw(psw_t psw)
189 {
190 #ifndef __s390x__
191 asm volatile("lpsw %0" : : "Q" (psw) : "cc");
192 #else
193 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
194 #endif
195 }
196
197 /*
198 * Set PSW mask to specified value, while leaving the
199 * PSW addr pointing to the next instruction.
200 */
__load_psw_mask(unsigned long mask)201 static inline void __load_psw_mask (unsigned long mask)
202 {
203 unsigned long addr;
204 psw_t psw;
205
206 psw.mask = mask;
207
208 #ifndef __s390x__
209 asm volatile(
210 " basr %0,0\n"
211 "0: ahi %0,1f-0b\n"
212 " st %0,%O1+4(%R1)\n"
213 " lpsw %1\n"
214 "1:"
215 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
216 #else /* __s390x__ */
217 asm volatile(
218 " larl %0,1f\n"
219 " stg %0,%O1+8(%R1)\n"
220 " lpswe %1\n"
221 "1:"
222 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
223 #endif /* __s390x__ */
224 }
225
226 /*
227 * Rewind PSW instruction address by specified number of bytes.
228 */
__rewind_psw(psw_t psw,unsigned long ilc)229 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
230 {
231 #ifndef __s390x__
232 if (psw.addr & PSW_ADDR_AMODE)
233 /* 31 bit mode */
234 return (psw.addr - ilc) | PSW_ADDR_AMODE;
235 /* 24 bit mode */
236 return (psw.addr - ilc) & ((1UL << 24) - 1);
237 #else
238 unsigned long mask;
239
240 mask = (psw.mask & PSW_MASK_EA) ? -1UL :
241 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
242 (1UL << 24) - 1;
243 return (psw.addr - ilc) & mask;
244 #endif
245 }
246
247 /*
248 * Function to drop a processor into disabled wait state
249 */
disabled_wait(unsigned long code)250 static inline void __noreturn disabled_wait(unsigned long code)
251 {
252 unsigned long ctl_buf;
253 psw_t dw_psw;
254
255 dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
256 dw_psw.addr = code;
257 /*
258 * Store status and then load disabled wait psw,
259 * the processor is dead afterwards
260 */
261 #ifndef __s390x__
262 asm volatile(
263 " stctl 0,0,0(%2)\n"
264 " ni 0(%2),0xef\n" /* switch off protection */
265 " lctl 0,0,0(%2)\n"
266 " stpt 0xd8\n" /* store timer */
267 " stckc 0xe0\n" /* store clock comparator */
268 " stpx 0x108\n" /* store prefix register */
269 " stam 0,15,0x120\n" /* store access registers */
270 " std 0,0x160\n" /* store f0 */
271 " std 2,0x168\n" /* store f2 */
272 " std 4,0x170\n" /* store f4 */
273 " std 6,0x178\n" /* store f6 */
274 " stm 0,15,0x180\n" /* store general registers */
275 " stctl 0,15,0x1c0\n" /* store control registers */
276 " oi 0x1c0,0x10\n" /* fake protection bit */
277 " lpsw 0(%1)"
278 : "=m" (ctl_buf)
279 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
280 #else /* __s390x__ */
281 asm volatile(
282 " stctg 0,0,0(%2)\n"
283 " ni 4(%2),0xef\n" /* switch off protection */
284 " lctlg 0,0,0(%2)\n"
285 " lghi 1,0x1000\n"
286 " stpt 0x328(1)\n" /* store timer */
287 " stckc 0x330(1)\n" /* store clock comparator */
288 " stpx 0x318(1)\n" /* store prefix register */
289 " stam 0,15,0x340(1)\n"/* store access registers */
290 " stfpc 0x31c(1)\n" /* store fpu control */
291 " std 0,0x200(1)\n" /* store f0 */
292 " std 1,0x208(1)\n" /* store f1 */
293 " std 2,0x210(1)\n" /* store f2 */
294 " std 3,0x218(1)\n" /* store f3 */
295 " std 4,0x220(1)\n" /* store f4 */
296 " std 5,0x228(1)\n" /* store f5 */
297 " std 6,0x230(1)\n" /* store f6 */
298 " std 7,0x238(1)\n" /* store f7 */
299 " std 8,0x240(1)\n" /* store f8 */
300 " std 9,0x248(1)\n" /* store f9 */
301 " std 10,0x250(1)\n" /* store f10 */
302 " std 11,0x258(1)\n" /* store f11 */
303 " std 12,0x260(1)\n" /* store f12 */
304 " std 13,0x268(1)\n" /* store f13 */
305 " std 14,0x270(1)\n" /* store f14 */
306 " std 15,0x278(1)\n" /* store f15 */
307 " stmg 0,15,0x280(1)\n"/* store general registers */
308 " stctg 0,15,0x380(1)\n"/* store control registers */
309 " oi 0x384(1),0x10\n"/* fake protection bit */
310 " lpswe 0(%1)"
311 : "=m" (ctl_buf)
312 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
313 #endif /* __s390x__ */
314 while (1);
315 }
316
317 /*
318 * Use to set psw mask except for the first byte which
319 * won't be changed by this function.
320 */
321 static inline void
__set_psw_mask(unsigned long mask)322 __set_psw_mask(unsigned long mask)
323 {
324 __load_psw_mask(mask | (arch_local_save_flags() & ~(-1UL >> 8)));
325 }
326
327 #define local_mcck_enable() \
328 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
329 #define local_mcck_disable() \
330 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)
331
332 /*
333 * Basic Machine Check/Program Check Handler.
334 */
335
336 extern void s390_base_mcck_handler(void);
337 extern void s390_base_pgm_handler(void);
338 extern void s390_base_ext_handler(void);
339
340 extern void (*s390_base_mcck_handler_fn)(void);
341 extern void (*s390_base_pgm_handler_fn)(void);
342 extern void (*s390_base_ext_handler_fn)(void);
343
344 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
345
346 #endif
347
348 /*
349 * Helper macro for exception table entries
350 */
351 #ifndef __s390x__
352 #define EX_TABLE(_fault,_target) \
353 ".section __ex_table,\"a\"\n" \
354 " .align 4\n" \
355 " .long " #_fault "," #_target "\n" \
356 ".previous\n"
357 #else
358 #define EX_TABLE(_fault,_target) \
359 ".section __ex_table,\"a\"\n" \
360 " .align 8\n" \
361 " .quad " #_fault "," #_target "\n" \
362 ".previous\n"
363 #endif
364
365 #endif /* __ASM_S390_PROCESSOR_H */
366