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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/page.h>
17#include <asm/ptrace.h>
18
19#ifdef __KERNEL__
20/*
21 * Default implementation of macro that returns current
22 * instruction pointer ("program counter").
23 */
24#define current_text_addr() ({ void *pc; __asm__("basr %0,0":"=a"(pc)); pc; })
25
26/*
27 * CPU type and hardware bug flags. Kept separately for each CPU.
28 * Members of this structure are referenced in head.S, so think twice
29 * before touching them. [mj]
30 */
31
32typedef struct
33{
34 unsigned int version : 8;
35 unsigned int ident : 24;
36 unsigned int machine : 16;
37 unsigned int unused : 16;
38} __attribute__ ((packed)) cpuid_t;
39
40struct cpuinfo_S390
41{
42 cpuid_t cpu_id;
43 __u16 cpu_addr;
44 __u16 cpu_nr;
45 unsigned long loops_per_jiffy;
46 unsigned long *pgd_quick;
47#ifdef __s390x__
48 unsigned long *pmd_quick;
49#endif /* __s390x__ */
50 unsigned long *pte_quick;
51 unsigned long pgtable_cache_sz;
52};
53
54extern void print_cpu_info(struct cpuinfo_S390 *);
55
56/* Lazy FPU handling on uni-processor */
57extern 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
77#define HAVE_ARCH_PICK_MMAP_LAYOUT
78
79typedef struct {
80 __u32 ar4;
81} mm_segment_t;
82
83/*
84 * Thread structure
85 */
86struct 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
102typedef struct thread_struct thread_struct;
103
104/*
105 * Stack layout of a C stack frame.
106 */
107#ifndef __PACK_STACK
108struct 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
115struct 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 { \
148 regs->psw.mask = PSW_USER_BITS; \
149 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
150 regs->gprs[15] = new_stackp ; \
151} while (0)
152
153#else /* __s390x__ */
154
155#define start_thread(regs, new_psw, new_stackp) do { \
156 regs->psw.mask = PSW_USER_BITS; \
157 regs->psw.addr = new_psw; \
158 regs->gprs[15] = new_stackp; \
159} while (0)
160
161#define start_thread31(regs, new_psw, new_stackp) do { \
162 regs->psw.mask = PSW_USER32_BITS; \
163 regs->psw.addr = new_psw; \
164 regs->gprs[15] = new_stackp; \
165} while (0)
166
167#endif /* __s390x__ */
168
169/* Forward declaration, a strange C thing */
170struct task_struct;
171struct mm_struct;
172
173/* Free all resources held by a thread. */
174extern void release_thread(struct task_struct *);
175extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
176
177/* Prepare to copy thread state - unlazy all lazy status */
178#define prepare_to_copy(tsk) do { } while (0)
179
180/*
181 * Return saved PC of a blocked thread.
182 */
183extern unsigned long thread_saved_pc(struct task_struct *t);
184
185/*
186 * Print register of task into buffer. Used in fs/proc/array.c.
187 */
188extern char *task_show_regs(struct task_struct *task, char *buffer);
189
190extern void show_registers(struct pt_regs *regs);
191extern void show_trace(struct task_struct *task, unsigned long *sp);
192
193unsigned long get_wchan(struct task_struct *p);
194#define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
195 ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
196#define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
197#define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
198
199/*
200 * Give up the time slice of the virtual PU.
201 */
202#ifndef __s390x__
203# define cpu_relax() asm volatile ("diag 0,0,68" : : : "memory")
204#else /* __s390x__ */
205# define cpu_relax() \
206 do { \
207 if (MACHINE_HAS_DIAG44) \
208 asm volatile ("diag 0,0,68" : : : "memory"); \
209 } while (0)
210#endif /* __s390x__ */
211
212/*
213 * Set PSW to specified value.
214 */
215static inline void __load_psw(psw_t psw)
216{
217#ifndef __s390x__
218 asm volatile ("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
219#else
220 asm volatile ("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
221#endif
222}
223
224/*
225 * Set PSW mask to specified value, while leaving the
226 * PSW addr pointing to the next instruction.
227 */
228
229static inline void __load_psw_mask (unsigned long mask)
230{
231 unsigned long addr;
232 psw_t psw;
233
234 psw.mask = mask;
235
236#ifndef __s390x__
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"
242 "1:"
243 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
244#else /* __s390x__ */
245 asm volatile (
246 " larl %0,1f\n"
247 " stg %0,8(%1)\n"
248 " lpswe 0(%1)\n"
249 "1:"
250 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
251#endif /* __s390x__ */
252}
253
254/*
255 * Function to stop a processor until an interruption occurred
256 */
257static inline void enabled_wait(void)
258{
259 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
260 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
261}
262
263/*
264 * Function to drop a processor into disabled wait state
265 */
266
267static inline void disabled_wait(unsigned long code)
268{
269 unsigned long ctl_buf;
270 psw_t dw_psw;
271
272 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
273 dw_psw.addr = code;
274 /*
275 * Store status and then load disabled wait psw,
276 * the processor is dead afterwards
277 */
278#ifndef __s390x__
279 asm volatile (" stctl 0,0,0(%2)\n"
280 " ni 0(%2),0xef\n" /* switch off protection */
281 " lctl 0,0,0(%2)\n"
282 " stpt 0xd8\n" /* store timer */
283 " stckc 0xe0\n" /* store clock comparator */
284 " stpx 0x108\n" /* store prefix register */
285 " stam 0,15,0x120\n" /* store access registers */
286 " std 0,0x160\n" /* store f0 */
287 " std 2,0x168\n" /* store f2 */
288 " std 4,0x170\n" /* store f4 */
289 " std 6,0x178\n" /* store f6 */
290 " stm 0,15,0x180\n" /* store general registers */
291 " stctl 0,15,0x1c0\n" /* store control registers */
292 " oi 0x1c0,0x10\n" /* fake protection bit */
293 " lpsw 0(%1)"
294 : "=m" (ctl_buf)
295 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
296#else /* __s390x__ */
297 asm volatile (" stctg 0,0,0(%2)\n"
298 " ni 4(%2),0xef\n" /* switch off protection */
299 " lctlg 0,0,0(%2)\n"
300 " lghi 1,0x1000\n"
301 " stpt 0x328(1)\n" /* store timer */
302 " stckc 0x330(1)\n" /* store clock comparator */
303 " stpx 0x318(1)\n" /* store prefix register */
304 " stam 0,15,0x340(1)\n" /* store access registers */
305 " stfpc 0x31c(1)\n" /* store fpu control */
306 " std 0,0x200(1)\n" /* store f0 */
307 " std 1,0x208(1)\n" /* store f1 */
308 " std 2,0x210(1)\n" /* store f2 */
309 " std 3,0x218(1)\n" /* store f3 */
310 " std 4,0x220(1)\n" /* store f4 */
311 " std 5,0x228(1)\n" /* store f5 */
312 " std 6,0x230(1)\n" /* store f6 */
313 " std 7,0x238(1)\n" /* store f7 */
314 " std 8,0x240(1)\n" /* store f8 */
315 " std 9,0x248(1)\n" /* store f9 */
316 " std 10,0x250(1)\n" /* store f10 */
317 " std 11,0x258(1)\n" /* store f11 */
318 " std 12,0x260(1)\n" /* store f12 */
319 " std 13,0x268(1)\n" /* store f13 */
320 " std 14,0x270(1)\n" /* store f14 */
321 " std 15,0x278(1)\n" /* store f15 */
322 " stmg 0,15,0x280(1)\n" /* store general registers */
323 " stctg 0,15,0x380(1)\n" /* store control registers */
324 " oi 0x384(1),0x10\n" /* fake protection bit */
325 " lpswe 0(%1)"
326 : "=m" (ctl_buf)
327 : "a" (&dw_psw), "a" (&ctl_buf),
328 "m" (dw_psw) : "cc", "0", "1");
329#endif /* __s390x__ */
330}
331
332/*
333 * CPU idle notifier chain.
334 */
335#define CPU_IDLE 0
336#define CPU_NOT_IDLE 1
337
338struct notifier_block;
339int register_idle_notifier(struct notifier_block *nb);
340int unregister_idle_notifier(struct notifier_block *nb);
341
342#endif
343
344#endif /* __ASM_S390_PROCESSOR_H */