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1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <asm/ptrace.h> |
17 | ||
18 | #ifdef __KERNEL__ | |
19 | /* | |
20 | * Default implementation of macro that returns current | |
21 | * instruction pointer ("program counter"). | |
22 | */ | |
94c12cc7 | 23 | #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) |
1da177e4 LT |
24 | |
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 | ||
31 | typedef 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 | ||
39 | struct cpuinfo_S390 | |
40 | { | |
41 | cpuid_t cpu_id; | |
42 | __u16 cpu_addr; | |
43 | __u16 cpu_nr; | |
44 | unsigned long loops_per_jiffy; | |
45 | unsigned long *pgd_quick; | |
46 | #ifdef __s390x__ | |
47 | unsigned long *pmd_quick; | |
48 | #endif /* __s390x__ */ | |
49 | unsigned long *pte_quick; | |
50 | unsigned long pgtable_cache_sz; | |
51 | }; | |
52 | ||
31ee4b2f | 53 | extern void s390_adjust_jiffies(void); |
1da177e4 LT |
54 | extern void print_cpu_info(struct cpuinfo_S390 *); |
55 | ||
56 | /* Lazy FPU handling on uni-processor */ | |
57 | extern struct task_struct *last_task_used_math; | |
58 | ||
59 | /* | |
60 | * User space process size: 2GB for 31 bit, 4TB for 64 bit. | |
61 | */ | |
62 | #ifndef __s390x__ | |
63 | ||
64 | # define TASK_SIZE (0x80000000UL) | |
65 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
66 | # define DEFAULT_TASK_SIZE (0x80000000UL) | |
67 | ||
68 | #else /* __s390x__ */ | |
69 | ||
70 | # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ | |
71 | (0x80000000UL) : (0x40000000000UL)) | |
72 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
73 | # define DEFAULT_TASK_SIZE (0x40000000000UL) | |
74 | ||
75 | #endif /* __s390x__ */ | |
76 | ||
1da177e4 LT |
77 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
78 | ||
79 | typedef struct { | |
80 | __u32 ar4; | |
81 | } mm_segment_t; | |
82 | ||
83 | /* | |
84 | * Thread structure | |
85 | */ | |
86 | struct thread_struct { | |
87 | s390_fp_regs fp_regs; | |
88 | unsigned int acrs[NUM_ACRS]; | |
89 | unsigned long ksp; /* kernel stack pointer */ | |
90 | unsigned long user_seg; /* HSTD */ | |
91 | mm_segment_t mm_segment; | |
92 | unsigned long prot_addr; /* address of protection-excep. */ | |
93 | unsigned int error_code; /* error-code of last prog-excep. */ | |
94 | unsigned int trap_no; | |
95 | per_struct per_info; | |
96 | /* Used to give failing instruction back to user for ieee exceptions */ | |
97 | unsigned long ieee_instruction_pointer; | |
98 | /* pfault_wait is used to block the process on a pfault event */ | |
99 | unsigned long pfault_wait; | |
100 | }; | |
101 | ||
102 | typedef struct thread_struct thread_struct; | |
103 | ||
104 | /* | |
105 | * Stack layout of a C stack frame. | |
106 | */ | |
107 | #ifndef __PACK_STACK | |
108 | struct stack_frame { | |
109 | unsigned long back_chain; | |
110 | unsigned long empty1[5]; | |
111 | unsigned long gprs[10]; | |
112 | unsigned int empty2[8]; | |
113 | }; | |
114 | #else | |
115 | struct stack_frame { | |
116 | unsigned long empty1[5]; | |
117 | unsigned int empty2[8]; | |
118 | unsigned long gprs[10]; | |
119 | unsigned long back_chain; | |
120 | }; | |
121 | #endif | |
122 | ||
123 | #define ARCH_MIN_TASKALIGN 8 | |
124 | ||
125 | #ifndef __s390x__ | |
126 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE | |
127 | #else /* __s390x__ */ | |
128 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE | |
129 | #endif /* __s390x__ */ | |
130 | ||
131 | #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \ | |
132 | {0},{0},{0},{0},{0},{0}}}, \ | |
133 | {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \ | |
134 | sizeof(init_stack) + (unsigned long) &init_stack, \ | |
135 | __SWAPPER_PG_DIR, \ | |
136 | {0}, \ | |
137 | 0,0,0, \ | |
138 | (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \ | |
139 | 0, 0 \ | |
140 | } | |
141 | ||
142 | /* | |
143 | * Do necessary setup to start up a new thread. | |
144 | */ | |
145 | #ifndef __s390x__ | |
146 | ||
147 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 148 | set_fs(USER_DS); \ |
c1821c2e | 149 | regs->psw.mask = psw_user_bits; \ |
1da177e4 LT |
150 | regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ |
151 | regs->gprs[15] = new_stackp ; \ | |
152 | } while (0) | |
153 | ||
154 | #else /* __s390x__ */ | |
155 | ||
156 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 157 | set_fs(USER_DS); \ |
c1821c2e | 158 | regs->psw.mask = psw_user_bits; \ |
1da177e4 LT |
159 | regs->psw.addr = new_psw; \ |
160 | regs->gprs[15] = new_stackp; \ | |
161 | } while (0) | |
162 | ||
163 | #define start_thread31(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 164 | set_fs(USER_DS); \ |
c1821c2e | 165 | regs->psw.mask = psw_user32_bits; \ |
1da177e4 LT |
166 | regs->psw.addr = new_psw; \ |
167 | regs->gprs[15] = new_stackp; \ | |
168 | } while (0) | |
169 | ||
170 | #endif /* __s390x__ */ | |
171 | ||
172 | /* Forward declaration, a strange C thing */ | |
173 | struct task_struct; | |
174 | struct mm_struct; | |
175 | ||
176 | /* Free all resources held by a thread. */ | |
177 | extern void release_thread(struct task_struct *); | |
178 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
179 | ||
180 | /* Prepare to copy thread state - unlazy all lazy status */ | |
181 | #define prepare_to_copy(tsk) do { } while (0) | |
182 | ||
183 | /* | |
184 | * Return saved PC of a blocked thread. | |
185 | */ | |
186 | extern unsigned long thread_saved_pc(struct task_struct *t); | |
187 | ||
188 | /* | |
189 | * Print register of task into buffer. Used in fs/proc/array.c. | |
190 | */ | |
191 | extern char *task_show_regs(struct task_struct *task, char *buffer); | |
192 | ||
193 | extern void show_registers(struct pt_regs *regs); | |
194 | extern void show_trace(struct task_struct *task, unsigned long *sp); | |
195 | ||
196 | unsigned long get_wchan(struct task_struct *p); | |
c7584fb6 | 197 | #define task_pt_regs(tsk) ((struct pt_regs *) \ |
30af7120 | 198 | (task_stack_page(tsk) + THREAD_SIZE) - 1) |
c7584fb6 AV |
199 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) |
200 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) | |
1da177e4 LT |
201 | |
202 | /* | |
203 | * Give up the time slice of the virtual PU. | |
204 | */ | |
abdba61a HC |
205 | static inline void cpu_relax(void) |
206 | { | |
207 | if (MACHINE_HAS_DIAG44) | |
c48e0913 HC |
208 | asm volatile("diag 0,0,68"); |
209 | barrier(); | |
abdba61a | 210 | } |
1da177e4 | 211 | |
77fa2245 HC |
212 | /* |
213 | * Set PSW to specified value. | |
214 | */ | |
215 | static inline void __load_psw(psw_t psw) | |
216 | { | |
217 | #ifndef __s390x__ | |
94c12cc7 | 218 | asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 | 219 | #else |
94c12cc7 | 220 | asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 HC |
221 | #endif |
222 | } | |
223 | ||
1da177e4 LT |
224 | /* |
225 | * Set PSW mask to specified value, while leaving the | |
226 | * PSW addr pointing to the next instruction. | |
227 | */ | |
228 | ||
229 | static inline void __load_psw_mask (unsigned long mask) | |
230 | { | |
231 | unsigned long addr; | |
1da177e4 | 232 | psw_t psw; |
77fa2245 | 233 | |
1da177e4 LT |
234 | psw.mask = mask; |
235 | ||
236 | #ifndef __s390x__ | |
94c12cc7 MS |
237 | asm volatile( |
238 | " basr %0,0\n" | |
239 | "0: ahi %0,1f-0b\n" | |
240 | " st %0,4(%1)\n" | |
241 | " lpsw 0(%1)\n" | |
1da177e4 | 242 | "1:" |
94c12cc7 | 243 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 | 244 | #else /* __s390x__ */ |
94c12cc7 MS |
245 | asm volatile( |
246 | " larl %0,1f\n" | |
247 | " stg %0,8(%1)\n" | |
248 | " lpswe 0(%1)\n" | |
1da177e4 | 249 | "1:" |
94c12cc7 | 250 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 LT |
251 | #endif /* __s390x__ */ |
252 | } | |
253 | ||
254 | /* | |
255 | * Function to stop a processor until an interruption occurred | |
256 | */ | |
257 | static inline void enabled_wait(void) | |
258 | { | |
77fa2245 HC |
259 | __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | |
260 | PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); | |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
264 | * Function to drop a processor into disabled wait state | |
265 | */ | |
266 | ||
267 | static inline void disabled_wait(unsigned long code) | |
268 | { | |
1da177e4 | 269 | unsigned long ctl_buf; |
77fa2245 | 270 | psw_t dw_psw; |
1da177e4 | 271 | |
77fa2245 HC |
272 | dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
273 | dw_psw.addr = code; | |
1da177e4 LT |
274 | /* |
275 | * Store status and then load disabled wait psw, | |
276 | * the processor is dead afterwards | |
277 | */ | |
278 | #ifndef __s390x__ | |
94c12cc7 MS |
279 | asm volatile( |
280 | " stctl 0,0,0(%2)\n" | |
281 | " ni 0(%2),0xef\n" /* switch off protection */ | |
282 | " lctl 0,0,0(%2)\n" | |
283 | " stpt 0xd8\n" /* store timer */ | |
284 | " stckc 0xe0\n" /* store clock comparator */ | |
285 | " stpx 0x108\n" /* store prefix register */ | |
286 | " stam 0,15,0x120\n" /* store access registers */ | |
287 | " std 0,0x160\n" /* store f0 */ | |
288 | " std 2,0x168\n" /* store f2 */ | |
289 | " std 4,0x170\n" /* store f4 */ | |
290 | " std 6,0x178\n" /* store f6 */ | |
291 | " stm 0,15,0x180\n" /* store general registers */ | |
292 | " stctl 0,15,0x1c0\n" /* store control registers */ | |
293 | " oi 0x1c0,0x10\n" /* fake protection bit */ | |
294 | " lpsw 0(%1)" | |
295 | : "=m" (ctl_buf) | |
296 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); | |
1da177e4 | 297 | #else /* __s390x__ */ |
94c12cc7 MS |
298 | asm volatile( |
299 | " stctg 0,0,0(%2)\n" | |
300 | " ni 4(%2),0xef\n" /* switch off protection */ | |
301 | " lctlg 0,0,0(%2)\n" | |
302 | " lghi 1,0x1000\n" | |
303 | " stpt 0x328(1)\n" /* store timer */ | |
304 | " stckc 0x330(1)\n" /* store clock comparator */ | |
305 | " stpx 0x318(1)\n" /* store prefix register */ | |
306 | " stam 0,15,0x340(1)\n"/* store access registers */ | |
307 | " stfpc 0x31c(1)\n" /* store fpu control */ | |
308 | " std 0,0x200(1)\n" /* store f0 */ | |
309 | " std 1,0x208(1)\n" /* store f1 */ | |
310 | " std 2,0x210(1)\n" /* store f2 */ | |
311 | " std 3,0x218(1)\n" /* store f3 */ | |
312 | " std 4,0x220(1)\n" /* store f4 */ | |
313 | " std 5,0x228(1)\n" /* store f5 */ | |
314 | " std 6,0x230(1)\n" /* store f6 */ | |
315 | " std 7,0x238(1)\n" /* store f7 */ | |
316 | " std 8,0x240(1)\n" /* store f8 */ | |
317 | " std 9,0x248(1)\n" /* store f9 */ | |
318 | " std 10,0x250(1)\n" /* store f10 */ | |
319 | " std 11,0x258(1)\n" /* store f11 */ | |
320 | " std 12,0x260(1)\n" /* store f12 */ | |
321 | " std 13,0x268(1)\n" /* store f13 */ | |
322 | " std 14,0x270(1)\n" /* store f14 */ | |
323 | " std 15,0x278(1)\n" /* store f15 */ | |
324 | " stmg 0,15,0x280(1)\n"/* store general registers */ | |
325 | " stctg 0,15,0x380(1)\n"/* store control registers */ | |
326 | " oi 0x384(1),0x10\n"/* fake protection bit */ | |
327 | " lpswe 0(%1)" | |
328 | : "=m" (ctl_buf) | |
329 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0"); | |
1da177e4 LT |
330 | #endif /* __s390x__ */ |
331 | } | |
332 | ||
ab14de6c HC |
333 | /* |
334 | * Basic Machine Check/Program Check Handler. | |
335 | */ | |
336 | ||
337 | extern void s390_base_mcck_handler(void); | |
338 | extern void s390_base_pgm_handler(void); | |
339 | extern void s390_base_ext_handler(void); | |
340 | ||
341 | extern void (*s390_base_mcck_handler_fn)(void); | |
342 | extern void (*s390_base_pgm_handler_fn)(void); | |
343 | extern void (*s390_base_ext_handler_fn)(void); | |
344 | ||
1da177e4 LT |
345 | /* |
346 | * CPU idle notifier chain. | |
347 | */ | |
348 | #define CPU_IDLE 0 | |
349 | #define CPU_NOT_IDLE 1 | |
350 | ||
351 | struct notifier_block; | |
352 | int register_idle_notifier(struct notifier_block *nb); | |
353 | int unregister_idle_notifier(struct notifier_block *nb); | |
354 | ||
dfd54cbc HC |
355 | #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL |
356 | ||
1da177e4 LT |
357 | #endif |
358 | ||
de1a3f1c MS |
359 | /* |
360 | * Helper macro for exception table entries | |
361 | */ | |
362 | #ifndef __s390x__ | |
363 | #define EX_TABLE(_fault,_target) \ | |
364 | ".section __ex_table,\"a\"\n" \ | |
365 | " .align 4\n" \ | |
366 | " .long " #_fault "," #_target "\n" \ | |
367 | ".previous\n" | |
368 | #else | |
369 | #define EX_TABLE(_fault,_target) \ | |
370 | ".section __ex_table,\"a\"\n" \ | |
371 | " .align 8\n" \ | |
372 | " .quad " #_fault "," #_target "\n" \ | |
373 | ".previous\n" | |
374 | #endif | |
375 | ||
1da177e4 | 376 | #endif /* __ASM_S390_PROCESSOR_H */ |