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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 | ||
edd53787 | 16 | #include <linux/linkage.h> |
e86a6ed6 | 17 | #include <asm/cpu.h> |
25097bf1 | 18 | #include <asm/page.h> |
1da177e4 | 19 | #include <asm/ptrace.h> |
25097bf1 | 20 | #include <asm/setup.h> |
1da177e4 LT |
21 | |
22 | #ifdef __KERNEL__ | |
23 | /* | |
24 | * Default implementation of macro that returns current | |
25 | * instruction pointer ("program counter"). | |
26 | */ | |
94c12cc7 | 27 | #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) |
1da177e4 | 28 | |
e86a6ed6 | 29 | static inline void get_cpu_id(struct cpuid *ptr) |
72960a02 | 30 | { |
987bcdac | 31 | asm volatile("stidp %0" : "=Q" (*ptr)); |
72960a02 MH |
32 | } |
33 | ||
31ee4b2f | 34 | extern void s390_adjust_jiffies(void); |
7b468488 | 35 | extern void print_cpu_info(void); |
2fc2d1e9 | 36 | extern int get_cpu_capability(unsigned int *); |
1da177e4 | 37 | |
1da177e4 | 38 | /* |
f481bfaf | 39 | * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. |
1da177e4 LT |
40 | */ |
41 | #ifndef __s390x__ | |
42 | ||
5a216a20 MS |
43 | #define TASK_SIZE (1UL << 31) |
44 | #define TASK_UNMAPPED_BASE (1UL << 30) | |
1da177e4 LT |
45 | |
46 | #else /* __s390x__ */ | |
47 | ||
f481bfaf | 48 | #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) |
5a216a20 MS |
49 | #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ |
50 | (1UL << 30) : (1UL << 41)) | |
51 | #define TASK_SIZE TASK_SIZE_OF(current) | |
1da177e4 LT |
52 | |
53 | #endif /* __s390x__ */ | |
54 | ||
922a70d3 DH |
55 | #ifdef __KERNEL__ |
56 | ||
5a216a20 MS |
57 | #ifndef __s390x__ |
58 | #define STACK_TOP (1UL << 31) | |
6252d702 | 59 | #define STACK_TOP_MAX (1UL << 31) |
5a216a20 | 60 | #else /* __s390x__ */ |
6252d702 MS |
61 | #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) |
62 | #define STACK_TOP_MAX (1UL << 42) | |
5a216a20 MS |
63 | #endif /* __s390x__ */ |
64 | ||
922a70d3 DH |
65 | |
66 | #endif | |
67 | ||
1da177e4 LT |
68 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
69 | ||
70 | typedef struct { | |
71 | __u32 ar4; | |
72 | } mm_segment_t; | |
73 | ||
74 | /* | |
75 | * Thread structure | |
76 | */ | |
77 | struct thread_struct { | |
78 | s390_fp_regs fp_regs; | |
79 | unsigned int acrs[NUM_ACRS]; | |
80 | unsigned long ksp; /* kernel stack pointer */ | |
1da177e4 LT |
81 | mm_segment_t mm_segment; |
82 | unsigned long prot_addr; /* address of protection-excep. */ | |
1da177e4 LT |
83 | unsigned int trap_no; |
84 | per_struct per_info; | |
1da177e4 LT |
85 | /* pfault_wait is used to block the process on a pfault event */ |
86 | unsigned long pfault_wait; | |
87 | }; | |
88 | ||
89 | typedef struct thread_struct thread_struct; | |
90 | ||
91 | /* | |
92 | * Stack layout of a C stack frame. | |
93 | */ | |
94 | #ifndef __PACK_STACK | |
95 | struct stack_frame { | |
96 | unsigned long back_chain; | |
97 | unsigned long empty1[5]; | |
98 | unsigned long gprs[10]; | |
99 | unsigned int empty2[8]; | |
100 | }; | |
101 | #else | |
102 | struct stack_frame { | |
103 | unsigned long empty1[5]; | |
104 | unsigned int empty2[8]; | |
105 | unsigned long gprs[10]; | |
106 | unsigned long back_chain; | |
107 | }; | |
108 | #endif | |
109 | ||
110 | #define ARCH_MIN_TASKALIGN 8 | |
111 | ||
6f3fa3f0 MS |
112 | #define INIT_THREAD { \ |
113 | .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ | |
114 | } | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Do necessary setup to start up a new thread. | |
118 | */ | |
63506c41 | 119 | #define start_thread(regs, new_psw, new_stackp) do { \ |
9b241cc8 | 120 | set_fs(USER_DS); \ |
c1821c2e | 121 | regs->psw.mask = psw_user_bits; \ |
63506c41 MS |
122 | regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ |
123 | regs->gprs[15] = new_stackp; \ | |
124 | } while (0) | |
125 | ||
126 | #define start_thread31(regs, new_psw, new_stackp) do { \ | |
127 | set_fs(USER_DS); \ | |
128 | regs->psw.mask = psw_user32_bits; \ | |
129 | regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ | |
130 | regs->gprs[15] = new_stackp; \ | |
131 | crst_table_downgrade(current->mm, 1UL << 31); \ | |
1da177e4 LT |
132 | } while (0) |
133 | ||
1da177e4 LT |
134 | /* Forward declaration, a strange C thing */ |
135 | struct task_struct; | |
136 | struct mm_struct; | |
df5f8314 | 137 | struct seq_file; |
1da177e4 LT |
138 | |
139 | /* Free all resources held by a thread. */ | |
140 | extern void release_thread(struct task_struct *); | |
141 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
142 | ||
143 | /* Prepare to copy thread state - unlazy all lazy status */ | |
144 | #define prepare_to_copy(tsk) do { } while (0) | |
145 | ||
146 | /* | |
147 | * Return saved PC of a blocked thread. | |
148 | */ | |
149 | extern unsigned long thread_saved_pc(struct task_struct *t); | |
150 | ||
151 | /* | |
152 | * Print register of task into buffer. Used in fs/proc/array.c. | |
153 | */ | |
df5f8314 | 154 | extern void task_show_regs(struct seq_file *m, struct task_struct *task); |
1da177e4 | 155 | |
bb11e3bd | 156 | extern void show_code(struct pt_regs *regs); |
1da177e4 LT |
157 | |
158 | unsigned long get_wchan(struct task_struct *p); | |
c7584fb6 | 159 | #define task_pt_regs(tsk) ((struct pt_regs *) \ |
30af7120 | 160 | (task_stack_page(tsk) + THREAD_SIZE) - 1) |
c7584fb6 AV |
161 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) |
162 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) | |
1da177e4 LT |
163 | |
164 | /* | |
165 | * Give up the time slice of the virtual PU. | |
166 | */ | |
abdba61a HC |
167 | static inline void cpu_relax(void) |
168 | { | |
169 | if (MACHINE_HAS_DIAG44) | |
c48e0913 HC |
170 | asm volatile("diag 0,0,68"); |
171 | barrier(); | |
abdba61a | 172 | } |
1da177e4 | 173 | |
dc74d7f9 HC |
174 | static inline void psw_set_key(unsigned int key) |
175 | { | |
176 | asm volatile("spka 0(%0)" : : "d" (key)); | |
177 | } | |
178 | ||
77fa2245 HC |
179 | /* |
180 | * Set PSW to specified value. | |
181 | */ | |
182 | static inline void __load_psw(psw_t psw) | |
183 | { | |
184 | #ifndef __s390x__ | |
987bcdac | 185 | asm volatile("lpsw %0" : : "Q" (psw) : "cc"); |
77fa2245 | 186 | #else |
987bcdac | 187 | asm volatile("lpswe %0" : : "Q" (psw) : "cc"); |
77fa2245 HC |
188 | #endif |
189 | } | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Set PSW mask to specified value, while leaving the | |
193 | * PSW addr pointing to the next instruction. | |
194 | */ | |
195 | ||
196 | static inline void __load_psw_mask (unsigned long mask) | |
197 | { | |
198 | unsigned long addr; | |
1da177e4 | 199 | psw_t psw; |
77fa2245 | 200 | |
1da177e4 LT |
201 | psw.mask = mask; |
202 | ||
203 | #ifndef __s390x__ | |
94c12cc7 MS |
204 | asm volatile( |
205 | " basr %0,0\n" | |
206 | "0: ahi %0,1f-0b\n" | |
987bcdac MS |
207 | " st %0,%O1+4(%R1)\n" |
208 | " lpsw %1\n" | |
1da177e4 | 209 | "1:" |
987bcdac | 210 | : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); |
1da177e4 | 211 | #else /* __s390x__ */ |
94c12cc7 MS |
212 | asm volatile( |
213 | " larl %0,1f\n" | |
987bcdac MS |
214 | " stg %0,%O1+8(%R1)\n" |
215 | " lpswe %1\n" | |
1da177e4 | 216 | "1:" |
987bcdac | 217 | : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); |
1da177e4 LT |
218 | #endif /* __s390x__ */ |
219 | } | |
220 | ||
221 | /* | |
222 | * Function to stop a processor until an interruption occurred | |
223 | */ | |
224 | static inline void enabled_wait(void) | |
225 | { | |
77fa2245 HC |
226 | __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | |
227 | PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); | |
1da177e4 LT |
228 | } |
229 | ||
230 | /* | |
231 | * Function to drop a processor into disabled wait state | |
232 | */ | |
233 | ||
edd53787 | 234 | static inline void ATTRIB_NORET disabled_wait(unsigned long code) |
1da177e4 | 235 | { |
1da177e4 | 236 | unsigned long ctl_buf; |
77fa2245 | 237 | psw_t dw_psw; |
1da177e4 | 238 | |
77fa2245 HC |
239 | dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
240 | dw_psw.addr = code; | |
1da177e4 LT |
241 | /* |
242 | * Store status and then load disabled wait psw, | |
243 | * the processor is dead afterwards | |
244 | */ | |
245 | #ifndef __s390x__ | |
94c12cc7 MS |
246 | asm volatile( |
247 | " stctl 0,0,0(%2)\n" | |
248 | " ni 0(%2),0xef\n" /* switch off protection */ | |
249 | " lctl 0,0,0(%2)\n" | |
250 | " stpt 0xd8\n" /* store timer */ | |
251 | " stckc 0xe0\n" /* store clock comparator */ | |
252 | " stpx 0x108\n" /* store prefix register */ | |
253 | " stam 0,15,0x120\n" /* store access registers */ | |
254 | " std 0,0x160\n" /* store f0 */ | |
255 | " std 2,0x168\n" /* store f2 */ | |
256 | " std 4,0x170\n" /* store f4 */ | |
257 | " std 6,0x178\n" /* store f6 */ | |
258 | " stm 0,15,0x180\n" /* store general registers */ | |
259 | " stctl 0,15,0x1c0\n" /* store control registers */ | |
260 | " oi 0x1c0,0x10\n" /* fake protection bit */ | |
261 | " lpsw 0(%1)" | |
262 | : "=m" (ctl_buf) | |
263 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); | |
1da177e4 | 264 | #else /* __s390x__ */ |
94c12cc7 MS |
265 | asm volatile( |
266 | " stctg 0,0,0(%2)\n" | |
267 | " ni 4(%2),0xef\n" /* switch off protection */ | |
268 | " lctlg 0,0,0(%2)\n" | |
269 | " lghi 1,0x1000\n" | |
270 | " stpt 0x328(1)\n" /* store timer */ | |
271 | " stckc 0x330(1)\n" /* store clock comparator */ | |
272 | " stpx 0x318(1)\n" /* store prefix register */ | |
273 | " stam 0,15,0x340(1)\n"/* store access registers */ | |
274 | " stfpc 0x31c(1)\n" /* store fpu control */ | |
275 | " std 0,0x200(1)\n" /* store f0 */ | |
276 | " std 1,0x208(1)\n" /* store f1 */ | |
277 | " std 2,0x210(1)\n" /* store f2 */ | |
278 | " std 3,0x218(1)\n" /* store f3 */ | |
279 | " std 4,0x220(1)\n" /* store f4 */ | |
280 | " std 5,0x228(1)\n" /* store f5 */ | |
281 | " std 6,0x230(1)\n" /* store f6 */ | |
282 | " std 7,0x238(1)\n" /* store f7 */ | |
283 | " std 8,0x240(1)\n" /* store f8 */ | |
284 | " std 9,0x248(1)\n" /* store f9 */ | |
285 | " std 10,0x250(1)\n" /* store f10 */ | |
286 | " std 11,0x258(1)\n" /* store f11 */ | |
287 | " std 12,0x260(1)\n" /* store f12 */ | |
288 | " std 13,0x268(1)\n" /* store f13 */ | |
289 | " std 14,0x270(1)\n" /* store f14 */ | |
290 | " std 15,0x278(1)\n" /* store f15 */ | |
291 | " stmg 0,15,0x280(1)\n"/* store general registers */ | |
292 | " stctg 0,15,0x380(1)\n"/* store control registers */ | |
293 | " oi 0x384(1),0x10\n"/* fake protection bit */ | |
294 | " lpswe 0(%1)" | |
295 | : "=m" (ctl_buf) | |
bdd42b28 | 296 | : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); |
1da177e4 | 297 | #endif /* __s390x__ */ |
edd53787 | 298 | while (1); |
1da177e4 LT |
299 | } |
300 | ||
ab14de6c HC |
301 | /* |
302 | * Basic Machine Check/Program Check Handler. | |
303 | */ | |
304 | ||
305 | extern void s390_base_mcck_handler(void); | |
306 | extern void s390_base_pgm_handler(void); | |
307 | extern void s390_base_ext_handler(void); | |
308 | ||
309 | extern void (*s390_base_mcck_handler_fn)(void); | |
310 | extern void (*s390_base_pgm_handler_fn)(void); | |
311 | extern void (*s390_base_ext_handler_fn)(void); | |
312 | ||
dfd54cbc HC |
313 | #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL |
314 | ||
1da177e4 LT |
315 | #endif |
316 | ||
de1a3f1c MS |
317 | /* |
318 | * Helper macro for exception table entries | |
319 | */ | |
320 | #ifndef __s390x__ | |
321 | #define EX_TABLE(_fault,_target) \ | |
322 | ".section __ex_table,\"a\"\n" \ | |
323 | " .align 4\n" \ | |
324 | " .long " #_fault "," #_target "\n" \ | |
325 | ".previous\n" | |
326 | #else | |
327 | #define EX_TABLE(_fault,_target) \ | |
328 | ".section __ex_table,\"a\"\n" \ | |
329 | " .align 8\n" \ | |
330 | " .quad " #_fault "," #_target "\n" \ | |
331 | ".previous\n" | |
332 | #endif | |
333 | ||
1da177e4 | 334 | #endif /* __ASM_S390_PROCESSOR_H */ |