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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 <asm/ptrace.h>
17
18#ifdef __KERNEL__
19/*
20 * Default implementation of macro that returns current
21 * instruction pointer ("program counter").
22 */
23#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
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
31typedef 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
39static inline void get_cpu_id(cpuid_t *ptr)
40{
41 asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
42}
43
44struct 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
58extern void s390_adjust_jiffies(void);
59extern void print_cpu_info(struct cpuinfo_S390 *);
60extern int get_cpu_capability(unsigned int *);
61
62/* Lazy FPU handling on uni-processor */
63extern struct task_struct *last_task_used_math;
64
65/*
66 * User space process size: 2GB for 31 bit, 4TB for 64 bit.
67 */
68#ifndef __s390x__
69
70# define TASK_SIZE (0x80000000UL)
71# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
72# define DEFAULT_TASK_SIZE (0x80000000UL)
73
74#else /* __s390x__ */
75
76# define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \
77 (0x80000000UL) : (0x40000000000UL))
78# define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
79# define DEFAULT_TASK_SIZE (0x40000000000UL)
80
81#endif /* __s390x__ */
82
83#define HAVE_ARCH_PICK_MMAP_LAYOUT
84
85typedef struct {
86 __u32 ar4;
87} mm_segment_t;
88
89/*
90 * Thread structure
91 */
92struct thread_struct {
93 s390_fp_regs fp_regs;
94 unsigned int acrs[NUM_ACRS];
95 unsigned long ksp; /* kernel stack pointer */
96 unsigned long user_seg; /* HSTD */
97 mm_segment_t mm_segment;
98 unsigned long prot_addr; /* address of protection-excep. */
99 unsigned int error_code; /* error-code of last prog-excep. */
100 unsigned int trap_no;
101 per_struct per_info;
102 /* Used to give failing instruction back to user for ieee exceptions */
103 unsigned long ieee_instruction_pointer;
104 /* pfault_wait is used to block the process on a pfault event */
105 unsigned long pfault_wait;
106};
107
108typedef struct thread_struct thread_struct;
109
110/*
111 * Stack layout of a C stack frame.
112 */
113#ifndef __PACK_STACK
114struct stack_frame {
115 unsigned long back_chain;
116 unsigned long empty1[5];
117 unsigned long gprs[10];
118 unsigned int empty2[8];
119};
120#else
121struct stack_frame {
122 unsigned long empty1[5];
123 unsigned int empty2[8];
124 unsigned long gprs[10];
125 unsigned long back_chain;
126};
127#endif
128
129#define ARCH_MIN_TASKALIGN 8
130
131#ifndef __s390x__
132# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
133#else /* __s390x__ */
134# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
135#endif /* __s390x__ */
136
137#define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
138 {0},{0},{0},{0},{0},{0}}}, \
139 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
140 sizeof(init_stack) + (unsigned long) &init_stack, \
141 __SWAPPER_PG_DIR, \
142 {0}, \
143 0,0,0, \
144 (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
145 0, 0 \
146}
147
148/*
149 * Do necessary setup to start up a new thread.
150 */
151#ifndef __s390x__
152
153#define start_thread(regs, new_psw, new_stackp) do { \
154 set_fs(USER_DS); \
155 regs->psw.mask = psw_user_bits; \
156 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
157 regs->gprs[15] = new_stackp ; \
158} while (0)
159
160#else /* __s390x__ */
161
162#define start_thread(regs, new_psw, new_stackp) do { \
163 set_fs(USER_DS); \
164 regs->psw.mask = psw_user_bits; \
165 regs->psw.addr = new_psw; \
166 regs->gprs[15] = new_stackp; \
167} while (0)
168
169#define start_thread31(regs, new_psw, new_stackp) do { \
170 set_fs(USER_DS); \
171 regs->psw.mask = psw_user32_bits; \
172 regs->psw.addr = new_psw; \
173 regs->gprs[15] = new_stackp; \
174} while (0)
175
176#endif /* __s390x__ */
177
178/* Forward declaration, a strange C thing */
179struct task_struct;
180struct mm_struct;
181
182/* Free all resources held by a thread. */
183extern void release_thread(struct task_struct *);
184extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
185
186/* Prepare to copy thread state - unlazy all lazy status */
187#define prepare_to_copy(tsk) do { } while (0)
188
189/*
190 * Return saved PC of a blocked thread.
191 */
192extern unsigned long thread_saved_pc(struct task_struct *t);
193
194/*
195 * Print register of task into buffer. Used in fs/proc/array.c.
196 */
197extern char *task_show_regs(struct task_struct *task, char *buffer);
198
199extern void show_registers(struct pt_regs *regs);
200extern void show_code(struct pt_regs *regs);
201extern void show_trace(struct task_struct *task, unsigned long *sp);
202
203unsigned long get_wchan(struct task_struct *p);
204#define task_pt_regs(tsk) ((struct pt_regs *) \
205 (task_stack_page(tsk) + THREAD_SIZE) - 1)
206#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
207#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
208
209/*
210 * Give up the time slice of the virtual PU.
211 */
212static inline void cpu_relax(void)
213{
214 if (MACHINE_HAS_DIAG44)
215 asm volatile("diag 0,0,68");
216 barrier();
217}
218
219static inline void psw_set_key(unsigned int key)
220{
221 asm volatile("spka 0(%0)" : : "d" (key));
222}
223
224/*
225 * Set PSW to specified value.
226 */
227static inline void __load_psw(psw_t psw)
228{
229#ifndef __s390x__
230 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
231#else
232 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
233#endif
234}
235
236/*
237 * Set PSW mask to specified value, while leaving the
238 * PSW addr pointing to the next instruction.
239 */
240
241static inline void __load_psw_mask (unsigned long mask)
242{
243 unsigned long addr;
244 psw_t psw;
245
246 psw.mask = mask;
247
248#ifndef __s390x__
249 asm volatile(
250 " basr %0,0\n"
251 "0: ahi %0,1f-0b\n"
252 " st %0,4(%1)\n"
253 " lpsw 0(%1)\n"
254 "1:"
255 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
256#else /* __s390x__ */
257 asm volatile(
258 " larl %0,1f\n"
259 " stg %0,8(%1)\n"
260 " lpswe 0(%1)\n"
261 "1:"
262 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
263#endif /* __s390x__ */
264}
265
266/*
267 * Function to stop a processor until an interruption occurred
268 */
269static inline void enabled_wait(void)
270{
271 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
272 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
273}
274
275/*
276 * Function to drop a processor into disabled wait state
277 */
278
279static inline void disabled_wait(unsigned long code)
280{
281 unsigned long ctl_buf;
282 psw_t dw_psw;
283
284 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
285 dw_psw.addr = code;
286 /*
287 * Store status and then load disabled wait psw,
288 * the processor is dead afterwards
289 */
290#ifndef __s390x__
291 asm volatile(
292 " stctl 0,0,0(%2)\n"
293 " ni 0(%2),0xef\n" /* switch off protection */
294 " lctl 0,0,0(%2)\n"
295 " stpt 0xd8\n" /* store timer */
296 " stckc 0xe0\n" /* store clock comparator */
297 " stpx 0x108\n" /* store prefix register */
298 " stam 0,15,0x120\n" /* store access registers */
299 " std 0,0x160\n" /* store f0 */
300 " std 2,0x168\n" /* store f2 */
301 " std 4,0x170\n" /* store f4 */
302 " std 6,0x178\n" /* store f6 */
303 " stm 0,15,0x180\n" /* store general registers */
304 " stctl 0,15,0x1c0\n" /* store control registers */
305 " oi 0x1c0,0x10\n" /* fake protection bit */
306 " lpsw 0(%1)"
307 : "=m" (ctl_buf)
308 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
309#else /* __s390x__ */
310 asm volatile(
311 " stctg 0,0,0(%2)\n"
312 " ni 4(%2),0xef\n" /* switch off protection */
313 " lctlg 0,0,0(%2)\n"
314 " lghi 1,0x1000\n"
315 " stpt 0x328(1)\n" /* store timer */
316 " stckc 0x330(1)\n" /* store clock comparator */
317 " stpx 0x318(1)\n" /* store prefix register */
318 " stam 0,15,0x340(1)\n"/* store access registers */
319 " stfpc 0x31c(1)\n" /* store fpu control */
320 " std 0,0x200(1)\n" /* store f0 */
321 " std 1,0x208(1)\n" /* store f1 */
322 " std 2,0x210(1)\n" /* store f2 */
323 " std 3,0x218(1)\n" /* store f3 */
324 " std 4,0x220(1)\n" /* store f4 */
325 " std 5,0x228(1)\n" /* store f5 */
326 " std 6,0x230(1)\n" /* store f6 */
327 " std 7,0x238(1)\n" /* store f7 */
328 " std 8,0x240(1)\n" /* store f8 */
329 " std 9,0x248(1)\n" /* store f9 */
330 " std 10,0x250(1)\n" /* store f10 */
331 " std 11,0x258(1)\n" /* store f11 */
332 " std 12,0x260(1)\n" /* store f12 */
333 " std 13,0x268(1)\n" /* store f13 */
334 " std 14,0x270(1)\n" /* store f14 */
335 " std 15,0x278(1)\n" /* store f15 */
336 " stmg 0,15,0x280(1)\n"/* store general registers */
337 " stctg 0,15,0x380(1)\n"/* store control registers */
338 " oi 0x384(1),0x10\n"/* fake protection bit */
339 " lpswe 0(%1)"
340 : "=m" (ctl_buf)
341 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
342#endif /* __s390x__ */
343}
344
345/*
346 * Basic Machine Check/Program Check Handler.
347 */
348
349extern void s390_base_mcck_handler(void);
350extern void s390_base_pgm_handler(void);
351extern void s390_base_ext_handler(void);
352
353extern void (*s390_base_mcck_handler_fn)(void);
354extern void (*s390_base_pgm_handler_fn)(void);
355extern void (*s390_base_ext_handler_fn)(void);
356
357/*
358 * CPU idle notifier chain.
359 */
360#define S390_CPU_IDLE 0
361#define S390_CPU_NOT_IDLE 1
362
363struct notifier_block;
364int register_idle_notifier(struct notifier_block *nb);
365int unregister_idle_notifier(struct notifier_block *nb);
366
367#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
368
369#endif
370
371/*
372 * Helper macro for exception table entries
373 */
374#ifndef __s390x__
375#define EX_TABLE(_fault,_target) \
376 ".section __ex_table,\"a\"\n" \
377 " .align 4\n" \
378 " .long " #_fault "," #_target "\n" \
379 ".previous\n"
380#else
381#define EX_TABLE(_fault,_target) \
382 ".section __ex_table,\"a\"\n" \
383 " .align 8\n" \
384 " .quad " #_fault "," #_target "\n" \
385 ".previous\n"
386#endif
387
388#endif /* __ASM_S390_PROCESSOR_H */