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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 | ||
72960a02 MH |
39 | static inline void get_cpu_id(cpuid_t *ptr) |
40 | { | |
41 | asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr)); | |
42 | } | |
43 | ||
1da177e4 LT |
44 | struct 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 | ||
31ee4b2f | 58 | extern void s390_adjust_jiffies(void); |
1da177e4 LT |
59 | extern void print_cpu_info(struct cpuinfo_S390 *); |
60 | ||
61 | /* Lazy FPU handling on uni-processor */ | |
62 | extern struct task_struct *last_task_used_math; | |
63 | ||
64 | /* | |
65 | * User space process size: 2GB for 31 bit, 4TB for 64 bit. | |
66 | */ | |
67 | #ifndef __s390x__ | |
68 | ||
69 | # define TASK_SIZE (0x80000000UL) | |
70 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
71 | # define DEFAULT_TASK_SIZE (0x80000000UL) | |
72 | ||
73 | #else /* __s390x__ */ | |
74 | ||
75 | # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ | |
76 | (0x80000000UL) : (0x40000000000UL)) | |
77 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
78 | # define DEFAULT_TASK_SIZE (0x40000000000UL) | |
79 | ||
80 | #endif /* __s390x__ */ | |
81 | ||
1da177e4 LT |
82 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
83 | ||
84 | typedef struct { | |
85 | __u32 ar4; | |
86 | } mm_segment_t; | |
87 | ||
88 | /* | |
89 | * Thread structure | |
90 | */ | |
91 | struct thread_struct { | |
92 | s390_fp_regs fp_regs; | |
93 | unsigned int acrs[NUM_ACRS]; | |
94 | unsigned long ksp; /* kernel stack pointer */ | |
95 | unsigned long user_seg; /* HSTD */ | |
96 | mm_segment_t mm_segment; | |
97 | unsigned long prot_addr; /* address of protection-excep. */ | |
98 | unsigned int error_code; /* error-code of last prog-excep. */ | |
99 | unsigned int trap_no; | |
100 | per_struct per_info; | |
101 | /* Used to give failing instruction back to user for ieee exceptions */ | |
102 | unsigned long ieee_instruction_pointer; | |
103 | /* pfault_wait is used to block the process on a pfault event */ | |
104 | unsigned long pfault_wait; | |
105 | }; | |
106 | ||
107 | typedef struct thread_struct thread_struct; | |
108 | ||
109 | /* | |
110 | * Stack layout of a C stack frame. | |
111 | */ | |
112 | #ifndef __PACK_STACK | |
113 | struct stack_frame { | |
114 | unsigned long back_chain; | |
115 | unsigned long empty1[5]; | |
116 | unsigned long gprs[10]; | |
117 | unsigned int empty2[8]; | |
118 | }; | |
119 | #else | |
120 | struct stack_frame { | |
121 | unsigned long empty1[5]; | |
122 | unsigned int empty2[8]; | |
123 | unsigned long gprs[10]; | |
124 | unsigned long back_chain; | |
125 | }; | |
126 | #endif | |
127 | ||
128 | #define ARCH_MIN_TASKALIGN 8 | |
129 | ||
130 | #ifndef __s390x__ | |
131 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE | |
132 | #else /* __s390x__ */ | |
133 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE | |
134 | #endif /* __s390x__ */ | |
135 | ||
136 | #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \ | |
137 | {0},{0},{0},{0},{0},{0}}}, \ | |
138 | {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \ | |
139 | sizeof(init_stack) + (unsigned long) &init_stack, \ | |
140 | __SWAPPER_PG_DIR, \ | |
141 | {0}, \ | |
142 | 0,0,0, \ | |
143 | (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \ | |
144 | 0, 0 \ | |
145 | } | |
146 | ||
147 | /* | |
148 | * Do necessary setup to start up a new thread. | |
149 | */ | |
150 | #ifndef __s390x__ | |
151 | ||
152 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 153 | set_fs(USER_DS); \ |
c1821c2e | 154 | regs->psw.mask = psw_user_bits; \ |
1da177e4 LT |
155 | regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ |
156 | regs->gprs[15] = new_stackp ; \ | |
157 | } while (0) | |
158 | ||
159 | #else /* __s390x__ */ | |
160 | ||
161 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 162 | set_fs(USER_DS); \ |
c1821c2e | 163 | regs->psw.mask = psw_user_bits; \ |
1da177e4 LT |
164 | regs->psw.addr = new_psw; \ |
165 | regs->gprs[15] = new_stackp; \ | |
166 | } while (0) | |
167 | ||
168 | #define start_thread31(regs, new_psw, new_stackp) do { \ | |
9b241cc8 | 169 | set_fs(USER_DS); \ |
c1821c2e | 170 | regs->psw.mask = psw_user32_bits; \ |
1da177e4 LT |
171 | regs->psw.addr = new_psw; \ |
172 | regs->gprs[15] = new_stackp; \ | |
173 | } while (0) | |
174 | ||
175 | #endif /* __s390x__ */ | |
176 | ||
177 | /* Forward declaration, a strange C thing */ | |
178 | struct task_struct; | |
179 | struct mm_struct; | |
180 | ||
181 | /* Free all resources held by a thread. */ | |
182 | extern void release_thread(struct task_struct *); | |
183 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
184 | ||
185 | /* Prepare to copy thread state - unlazy all lazy status */ | |
186 | #define prepare_to_copy(tsk) do { } while (0) | |
187 | ||
188 | /* | |
189 | * Return saved PC of a blocked thread. | |
190 | */ | |
191 | extern unsigned long thread_saved_pc(struct task_struct *t); | |
192 | ||
193 | /* | |
194 | * Print register of task into buffer. Used in fs/proc/array.c. | |
195 | */ | |
196 | extern char *task_show_regs(struct task_struct *task, char *buffer); | |
197 | ||
198 | extern void show_registers(struct pt_regs *regs); | |
199 | extern void show_trace(struct task_struct *task, unsigned long *sp); | |
200 | ||
201 | unsigned long get_wchan(struct task_struct *p); | |
c7584fb6 | 202 | #define task_pt_regs(tsk) ((struct pt_regs *) \ |
30af7120 | 203 | (task_stack_page(tsk) + THREAD_SIZE) - 1) |
c7584fb6 AV |
204 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) |
205 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) | |
1da177e4 LT |
206 | |
207 | /* | |
208 | * Give up the time slice of the virtual PU. | |
209 | */ | |
abdba61a HC |
210 | static inline void cpu_relax(void) |
211 | { | |
212 | if (MACHINE_HAS_DIAG44) | |
c48e0913 HC |
213 | asm volatile("diag 0,0,68"); |
214 | barrier(); | |
abdba61a | 215 | } |
1da177e4 | 216 | |
77fa2245 HC |
217 | /* |
218 | * Set PSW to specified value. | |
219 | */ | |
220 | static inline void __load_psw(psw_t psw) | |
221 | { | |
222 | #ifndef __s390x__ | |
94c12cc7 | 223 | asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 | 224 | #else |
94c12cc7 | 225 | asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 HC |
226 | #endif |
227 | } | |
228 | ||
1da177e4 LT |
229 | /* |
230 | * Set PSW mask to specified value, while leaving the | |
231 | * PSW addr pointing to the next instruction. | |
232 | */ | |
233 | ||
234 | static inline void __load_psw_mask (unsigned long mask) | |
235 | { | |
236 | unsigned long addr; | |
1da177e4 | 237 | psw_t psw; |
77fa2245 | 238 | |
1da177e4 LT |
239 | psw.mask = mask; |
240 | ||
241 | #ifndef __s390x__ | |
94c12cc7 MS |
242 | asm volatile( |
243 | " basr %0,0\n" | |
244 | "0: ahi %0,1f-0b\n" | |
245 | " st %0,4(%1)\n" | |
246 | " lpsw 0(%1)\n" | |
1da177e4 | 247 | "1:" |
94c12cc7 | 248 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 | 249 | #else /* __s390x__ */ |
94c12cc7 MS |
250 | asm volatile( |
251 | " larl %0,1f\n" | |
252 | " stg %0,8(%1)\n" | |
253 | " lpswe 0(%1)\n" | |
1da177e4 | 254 | "1:" |
94c12cc7 | 255 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 LT |
256 | #endif /* __s390x__ */ |
257 | } | |
258 | ||
259 | /* | |
260 | * Function to stop a processor until an interruption occurred | |
261 | */ | |
262 | static inline void enabled_wait(void) | |
263 | { | |
77fa2245 HC |
264 | __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | |
265 | PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); | |
1da177e4 LT |
266 | } |
267 | ||
268 | /* | |
269 | * Function to drop a processor into disabled wait state | |
270 | */ | |
271 | ||
272 | static inline void disabled_wait(unsigned long code) | |
273 | { | |
1da177e4 | 274 | unsigned long ctl_buf; |
77fa2245 | 275 | psw_t dw_psw; |
1da177e4 | 276 | |
77fa2245 HC |
277 | dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
278 | dw_psw.addr = code; | |
1da177e4 LT |
279 | /* |
280 | * Store status and then load disabled wait psw, | |
281 | * the processor is dead afterwards | |
282 | */ | |
283 | #ifndef __s390x__ | |
94c12cc7 MS |
284 | asm volatile( |
285 | " stctl 0,0,0(%2)\n" | |
286 | " ni 0(%2),0xef\n" /* switch off protection */ | |
287 | " lctl 0,0,0(%2)\n" | |
288 | " stpt 0xd8\n" /* store timer */ | |
289 | " stckc 0xe0\n" /* store clock comparator */ | |
290 | " stpx 0x108\n" /* store prefix register */ | |
291 | " stam 0,15,0x120\n" /* store access registers */ | |
292 | " std 0,0x160\n" /* store f0 */ | |
293 | " std 2,0x168\n" /* store f2 */ | |
294 | " std 4,0x170\n" /* store f4 */ | |
295 | " std 6,0x178\n" /* store f6 */ | |
296 | " stm 0,15,0x180\n" /* store general registers */ | |
297 | " stctl 0,15,0x1c0\n" /* store control registers */ | |
298 | " oi 0x1c0,0x10\n" /* fake protection bit */ | |
299 | " lpsw 0(%1)" | |
300 | : "=m" (ctl_buf) | |
301 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); | |
1da177e4 | 302 | #else /* __s390x__ */ |
94c12cc7 MS |
303 | asm volatile( |
304 | " stctg 0,0,0(%2)\n" | |
305 | " ni 4(%2),0xef\n" /* switch off protection */ | |
306 | " lctlg 0,0,0(%2)\n" | |
307 | " lghi 1,0x1000\n" | |
308 | " stpt 0x328(1)\n" /* store timer */ | |
309 | " stckc 0x330(1)\n" /* store clock comparator */ | |
310 | " stpx 0x318(1)\n" /* store prefix register */ | |
311 | " stam 0,15,0x340(1)\n"/* store access registers */ | |
312 | " stfpc 0x31c(1)\n" /* store fpu control */ | |
313 | " std 0,0x200(1)\n" /* store f0 */ | |
314 | " std 1,0x208(1)\n" /* store f1 */ | |
315 | " std 2,0x210(1)\n" /* store f2 */ | |
316 | " std 3,0x218(1)\n" /* store f3 */ | |
317 | " std 4,0x220(1)\n" /* store f4 */ | |
318 | " std 5,0x228(1)\n" /* store f5 */ | |
319 | " std 6,0x230(1)\n" /* store f6 */ | |
320 | " std 7,0x238(1)\n" /* store f7 */ | |
321 | " std 8,0x240(1)\n" /* store f8 */ | |
322 | " std 9,0x248(1)\n" /* store f9 */ | |
323 | " std 10,0x250(1)\n" /* store f10 */ | |
324 | " std 11,0x258(1)\n" /* store f11 */ | |
325 | " std 12,0x260(1)\n" /* store f12 */ | |
326 | " std 13,0x268(1)\n" /* store f13 */ | |
327 | " std 14,0x270(1)\n" /* store f14 */ | |
328 | " std 15,0x278(1)\n" /* store f15 */ | |
329 | " stmg 0,15,0x280(1)\n"/* store general registers */ | |
330 | " stctg 0,15,0x380(1)\n"/* store control registers */ | |
331 | " oi 0x384(1),0x10\n"/* fake protection bit */ | |
332 | " lpswe 0(%1)" | |
333 | : "=m" (ctl_buf) | |
334 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0"); | |
1da177e4 LT |
335 | #endif /* __s390x__ */ |
336 | } | |
337 | ||
ab14de6c HC |
338 | /* |
339 | * Basic Machine Check/Program Check Handler. | |
340 | */ | |
341 | ||
342 | extern void s390_base_mcck_handler(void); | |
343 | extern void s390_base_pgm_handler(void); | |
344 | extern void s390_base_ext_handler(void); | |
345 | ||
346 | extern void (*s390_base_mcck_handler_fn)(void); | |
347 | extern void (*s390_base_pgm_handler_fn)(void); | |
348 | extern void (*s390_base_ext_handler_fn)(void); | |
349 | ||
1da177e4 LT |
350 | /* |
351 | * CPU idle notifier chain. | |
352 | */ | |
353 | #define CPU_IDLE 0 | |
354 | #define CPU_NOT_IDLE 1 | |
355 | ||
356 | struct notifier_block; | |
357 | int register_idle_notifier(struct notifier_block *nb); | |
358 | int unregister_idle_notifier(struct notifier_block *nb); | |
359 | ||
dfd54cbc HC |
360 | #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL |
361 | ||
1da177e4 LT |
362 | #endif |
363 | ||
de1a3f1c MS |
364 | /* |
365 | * Helper macro for exception table entries | |
366 | */ | |
367 | #ifndef __s390x__ | |
368 | #define EX_TABLE(_fault,_target) \ | |
369 | ".section __ex_table,\"a\"\n" \ | |
370 | " .align 4\n" \ | |
371 | " .long " #_fault "," #_target "\n" \ | |
372 | ".previous\n" | |
373 | #else | |
374 | #define EX_TABLE(_fault,_target) \ | |
375 | ".section __ex_table,\"a\"\n" \ | |
376 | " .align 8\n" \ | |
377 | " .quad " #_fault "," #_target "\n" \ | |
378 | ".previous\n" | |
379 | #endif | |
380 | ||
1da177e4 | 381 | #endif /* __ASM_S390_PROCESSOR_H */ |