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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 | ||
53 | extern void print_cpu_info(struct cpuinfo_S390 *); | |
54 | ||
55 | /* Lazy FPU handling on uni-processor */ | |
56 | extern struct task_struct *last_task_used_math; | |
57 | ||
58 | /* | |
59 | * User space process size: 2GB for 31 bit, 4TB for 64 bit. | |
60 | */ | |
61 | #ifndef __s390x__ | |
62 | ||
63 | # define TASK_SIZE (0x80000000UL) | |
64 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
65 | # define DEFAULT_TASK_SIZE (0x80000000UL) | |
66 | ||
67 | #else /* __s390x__ */ | |
68 | ||
69 | # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \ | |
70 | (0x80000000UL) : (0x40000000000UL)) | |
71 | # define TASK_UNMAPPED_BASE (TASK_SIZE / 2) | |
72 | # define DEFAULT_TASK_SIZE (0x40000000000UL) | |
73 | ||
74 | #endif /* __s390x__ */ | |
75 | ||
1da177e4 LT |
76 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
77 | ||
78 | typedef struct { | |
79 | __u32 ar4; | |
80 | } mm_segment_t; | |
81 | ||
82 | /* | |
83 | * Thread structure | |
84 | */ | |
85 | struct thread_struct { | |
86 | s390_fp_regs fp_regs; | |
87 | unsigned int acrs[NUM_ACRS]; | |
88 | unsigned long ksp; /* kernel stack pointer */ | |
89 | unsigned long user_seg; /* HSTD */ | |
90 | mm_segment_t mm_segment; | |
91 | unsigned long prot_addr; /* address of protection-excep. */ | |
92 | unsigned int error_code; /* error-code of last prog-excep. */ | |
93 | unsigned int trap_no; | |
94 | per_struct per_info; | |
95 | /* Used to give failing instruction back to user for ieee exceptions */ | |
96 | unsigned long ieee_instruction_pointer; | |
97 | /* pfault_wait is used to block the process on a pfault event */ | |
98 | unsigned long pfault_wait; | |
99 | }; | |
100 | ||
101 | typedef struct thread_struct thread_struct; | |
102 | ||
103 | /* | |
104 | * Stack layout of a C stack frame. | |
105 | */ | |
106 | #ifndef __PACK_STACK | |
107 | struct stack_frame { | |
108 | unsigned long back_chain; | |
109 | unsigned long empty1[5]; | |
110 | unsigned long gprs[10]; | |
111 | unsigned int empty2[8]; | |
112 | }; | |
113 | #else | |
114 | struct stack_frame { | |
115 | unsigned long empty1[5]; | |
116 | unsigned int empty2[8]; | |
117 | unsigned long gprs[10]; | |
118 | unsigned long back_chain; | |
119 | }; | |
120 | #endif | |
121 | ||
122 | #define ARCH_MIN_TASKALIGN 8 | |
123 | ||
124 | #ifndef __s390x__ | |
125 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE | |
126 | #else /* __s390x__ */ | |
127 | # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE | |
128 | #endif /* __s390x__ */ | |
129 | ||
130 | #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \ | |
131 | {0},{0},{0},{0},{0},{0}}}, \ | |
132 | {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \ | |
133 | sizeof(init_stack) + (unsigned long) &init_stack, \ | |
134 | __SWAPPER_PG_DIR, \ | |
135 | {0}, \ | |
136 | 0,0,0, \ | |
137 | (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \ | |
138 | 0, 0 \ | |
139 | } | |
140 | ||
141 | /* | |
142 | * Do necessary setup to start up a new thread. | |
143 | */ | |
144 | #ifndef __s390x__ | |
145 | ||
146 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
147 | regs->psw.mask = PSW_USER_BITS; \ | |
148 | regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ | |
149 | regs->gprs[15] = new_stackp ; \ | |
150 | } while (0) | |
151 | ||
152 | #else /* __s390x__ */ | |
153 | ||
154 | #define start_thread(regs, new_psw, new_stackp) do { \ | |
155 | regs->psw.mask = PSW_USER_BITS; \ | |
156 | regs->psw.addr = new_psw; \ | |
157 | regs->gprs[15] = new_stackp; \ | |
158 | } while (0) | |
159 | ||
160 | #define start_thread31(regs, new_psw, new_stackp) do { \ | |
161 | regs->psw.mask = PSW_USER32_BITS; \ | |
162 | regs->psw.addr = new_psw; \ | |
163 | regs->gprs[15] = new_stackp; \ | |
164 | } while (0) | |
165 | ||
166 | #endif /* __s390x__ */ | |
167 | ||
168 | /* Forward declaration, a strange C thing */ | |
169 | struct task_struct; | |
170 | struct mm_struct; | |
171 | ||
172 | /* Free all resources held by a thread. */ | |
173 | extern void release_thread(struct task_struct *); | |
174 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
175 | ||
176 | /* Prepare to copy thread state - unlazy all lazy status */ | |
177 | #define prepare_to_copy(tsk) do { } while (0) | |
178 | ||
179 | /* | |
180 | * Return saved PC of a blocked thread. | |
181 | */ | |
182 | extern unsigned long thread_saved_pc(struct task_struct *t); | |
183 | ||
184 | /* | |
185 | * Print register of task into buffer. Used in fs/proc/array.c. | |
186 | */ | |
187 | extern char *task_show_regs(struct task_struct *task, char *buffer); | |
188 | ||
189 | extern void show_registers(struct pt_regs *regs); | |
190 | extern void show_trace(struct task_struct *task, unsigned long *sp); | |
191 | ||
192 | unsigned long get_wchan(struct task_struct *p); | |
c7584fb6 | 193 | #define task_pt_regs(tsk) ((struct pt_regs *) \ |
30af7120 | 194 | (task_stack_page(tsk) + THREAD_SIZE) - 1) |
c7584fb6 AV |
195 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) |
196 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) | |
1da177e4 LT |
197 | |
198 | /* | |
199 | * Give up the time slice of the virtual PU. | |
200 | */ | |
abdba61a HC |
201 | static inline void cpu_relax(void) |
202 | { | |
203 | if (MACHINE_HAS_DIAG44) | |
94c12cc7 | 204 | asm volatile("diag 0,0,68" : : : "memory"); |
abdba61a HC |
205 | else |
206 | barrier(); | |
207 | } | |
1da177e4 | 208 | |
77fa2245 HC |
209 | /* |
210 | * Set PSW to specified value. | |
211 | */ | |
212 | static inline void __load_psw(psw_t psw) | |
213 | { | |
214 | #ifndef __s390x__ | |
94c12cc7 | 215 | asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 | 216 | #else |
94c12cc7 | 217 | asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc"); |
77fa2245 HC |
218 | #endif |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* |
222 | * Set PSW mask to specified value, while leaving the | |
223 | * PSW addr pointing to the next instruction. | |
224 | */ | |
225 | ||
226 | static inline void __load_psw_mask (unsigned long mask) | |
227 | { | |
228 | unsigned long addr; | |
1da177e4 | 229 | psw_t psw; |
77fa2245 | 230 | |
1da177e4 LT |
231 | psw.mask = mask; |
232 | ||
233 | #ifndef __s390x__ | |
94c12cc7 MS |
234 | asm volatile( |
235 | " basr %0,0\n" | |
236 | "0: ahi %0,1f-0b\n" | |
237 | " st %0,4(%1)\n" | |
238 | " lpsw 0(%1)\n" | |
1da177e4 | 239 | "1:" |
94c12cc7 | 240 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 | 241 | #else /* __s390x__ */ |
94c12cc7 MS |
242 | asm volatile( |
243 | " larl %0,1f\n" | |
244 | " stg %0,8(%1)\n" | |
245 | " lpswe 0(%1)\n" | |
1da177e4 | 246 | "1:" |
94c12cc7 | 247 | : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc"); |
1da177e4 LT |
248 | #endif /* __s390x__ */ |
249 | } | |
250 | ||
251 | /* | |
252 | * Function to stop a processor until an interruption occurred | |
253 | */ | |
254 | static inline void enabled_wait(void) | |
255 | { | |
77fa2245 HC |
256 | __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | |
257 | PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); | |
1da177e4 LT |
258 | } |
259 | ||
260 | /* | |
261 | * Function to drop a processor into disabled wait state | |
262 | */ | |
263 | ||
264 | static inline void disabled_wait(unsigned long code) | |
265 | { | |
1da177e4 | 266 | unsigned long ctl_buf; |
77fa2245 | 267 | psw_t dw_psw; |
1da177e4 | 268 | |
77fa2245 HC |
269 | dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
270 | dw_psw.addr = code; | |
1da177e4 LT |
271 | /* |
272 | * Store status and then load disabled wait psw, | |
273 | * the processor is dead afterwards | |
274 | */ | |
275 | #ifndef __s390x__ | |
94c12cc7 MS |
276 | asm volatile( |
277 | " stctl 0,0,0(%2)\n" | |
278 | " ni 0(%2),0xef\n" /* switch off protection */ | |
279 | " lctl 0,0,0(%2)\n" | |
280 | " stpt 0xd8\n" /* store timer */ | |
281 | " stckc 0xe0\n" /* store clock comparator */ | |
282 | " stpx 0x108\n" /* store prefix register */ | |
283 | " stam 0,15,0x120\n" /* store access registers */ | |
284 | " std 0,0x160\n" /* store f0 */ | |
285 | " std 2,0x168\n" /* store f2 */ | |
286 | " std 4,0x170\n" /* store f4 */ | |
287 | " std 6,0x178\n" /* store f6 */ | |
288 | " stm 0,15,0x180\n" /* store general registers */ | |
289 | " stctl 0,15,0x1c0\n" /* store control registers */ | |
290 | " oi 0x1c0,0x10\n" /* fake protection bit */ | |
291 | " lpsw 0(%1)" | |
292 | : "=m" (ctl_buf) | |
293 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); | |
1da177e4 | 294 | #else /* __s390x__ */ |
94c12cc7 MS |
295 | asm volatile( |
296 | " stctg 0,0,0(%2)\n" | |
297 | " ni 4(%2),0xef\n" /* switch off protection */ | |
298 | " lctlg 0,0,0(%2)\n" | |
299 | " lghi 1,0x1000\n" | |
300 | " stpt 0x328(1)\n" /* store timer */ | |
301 | " stckc 0x330(1)\n" /* store clock comparator */ | |
302 | " stpx 0x318(1)\n" /* store prefix register */ | |
303 | " stam 0,15,0x340(1)\n"/* store access registers */ | |
304 | " stfpc 0x31c(1)\n" /* store fpu control */ | |
305 | " std 0,0x200(1)\n" /* store f0 */ | |
306 | " std 1,0x208(1)\n" /* store f1 */ | |
307 | " std 2,0x210(1)\n" /* store f2 */ | |
308 | " std 3,0x218(1)\n" /* store f3 */ | |
309 | " std 4,0x220(1)\n" /* store f4 */ | |
310 | " std 5,0x228(1)\n" /* store f5 */ | |
311 | " std 6,0x230(1)\n" /* store f6 */ | |
312 | " std 7,0x238(1)\n" /* store f7 */ | |
313 | " std 8,0x240(1)\n" /* store f8 */ | |
314 | " std 9,0x248(1)\n" /* store f9 */ | |
315 | " std 10,0x250(1)\n" /* store f10 */ | |
316 | " std 11,0x258(1)\n" /* store f11 */ | |
317 | " std 12,0x260(1)\n" /* store f12 */ | |
318 | " std 13,0x268(1)\n" /* store f13 */ | |
319 | " std 14,0x270(1)\n" /* store f14 */ | |
320 | " std 15,0x278(1)\n" /* store f15 */ | |
321 | " stmg 0,15,0x280(1)\n"/* store general registers */ | |
322 | " stctg 0,15,0x380(1)\n"/* store control registers */ | |
323 | " oi 0x384(1),0x10\n"/* fake protection bit */ | |
324 | " lpswe 0(%1)" | |
325 | : "=m" (ctl_buf) | |
326 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0"); | |
1da177e4 LT |
327 | #endif /* __s390x__ */ |
328 | } | |
329 | ||
330 | /* | |
331 | * CPU idle notifier chain. | |
332 | */ | |
333 | #define CPU_IDLE 0 | |
334 | #define CPU_NOT_IDLE 1 | |
335 | ||
336 | struct notifier_block; | |
337 | int register_idle_notifier(struct notifier_block *nb); | |
338 | int unregister_idle_notifier(struct notifier_block *nb); | |
339 | ||
dfd54cbc HC |
340 | #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL |
341 | ||
1da177e4 LT |
342 | #endif |
343 | ||
de1a3f1c MS |
344 | /* |
345 | * Helper macro for exception table entries | |
346 | */ | |
347 | #ifndef __s390x__ | |
348 | #define EX_TABLE(_fault,_target) \ | |
349 | ".section __ex_table,\"a\"\n" \ | |
350 | " .align 4\n" \ | |
351 | " .long " #_fault "," #_target "\n" \ | |
352 | ".previous\n" | |
353 | #else | |
354 | #define EX_TABLE(_fault,_target) \ | |
355 | ".section __ex_table,\"a\"\n" \ | |
356 | " .align 8\n" \ | |
357 | " .quad " #_fault "," #_target "\n" \ | |
358 | ".previous\n" | |
359 | #endif | |
360 | ||
1da177e4 | 361 | #endif /* __ASM_S390_PROCESSOR_H */ |