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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 MM_VM_SIZE(mm) DEFAULT_TASK_SIZE
78
79#define HAVE_ARCH_PICK_MMAP_LAYOUT
80
81typedef struct {
82 __u32 ar4;
83} mm_segment_t;
84
85/*
86 * Thread structure
87 */
88struct thread_struct {
89 s390_fp_regs fp_regs;
90 unsigned int acrs[NUM_ACRS];
91 unsigned long ksp; /* kernel stack pointer */
92 unsigned long user_seg; /* HSTD */
93 mm_segment_t mm_segment;
94 unsigned long prot_addr; /* address of protection-excep. */
95 unsigned int error_code; /* error-code of last prog-excep. */
96 unsigned int trap_no;
97 per_struct per_info;
98 /* Used to give failing instruction back to user for ieee exceptions */
99 unsigned long ieee_instruction_pointer;
100 /* pfault_wait is used to block the process on a pfault event */
101 unsigned long pfault_wait;
102};
103
104typedef struct thread_struct thread_struct;
105
106/*
107 * Stack layout of a C stack frame.
108 */
109#ifndef __PACK_STACK
110struct stack_frame {
111 unsigned long back_chain;
112 unsigned long empty1[5];
113 unsigned long gprs[10];
114 unsigned int empty2[8];
115};
116#else
117struct stack_frame {
118 unsigned long empty1[5];
119 unsigned int empty2[8];
120 unsigned long gprs[10];
121 unsigned long back_chain;
122};
123#endif
124
125#define ARCH_MIN_TASKALIGN 8
126
127#ifndef __s390x__
128# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
129#else /* __s390x__ */
130# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
131#endif /* __s390x__ */
132
133#define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
134 {0},{0},{0},{0},{0},{0}}}, \
135 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
136 sizeof(init_stack) + (unsigned long) &init_stack, \
137 __SWAPPER_PG_DIR, \
138 {0}, \
139 0,0,0, \
140 (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
141 0, 0 \
142}
143
144/*
145 * Do necessary setup to start up a new thread.
146 */
147#ifndef __s390x__
148
149#define start_thread(regs, new_psw, new_stackp) do { \
150 regs->psw.mask = PSW_USER_BITS; \
151 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
152 regs->gprs[15] = new_stackp ; \
153} while (0)
154
155#else /* __s390x__ */
156
157#define start_thread(regs, new_psw, new_stackp) do { \
158 regs->psw.mask = PSW_USER_BITS; \
159 regs->psw.addr = new_psw; \
160 regs->gprs[15] = new_stackp; \
161} while (0)
162
163#define start_thread31(regs, new_psw, new_stackp) do { \
164 regs->psw.mask = PSW_USER32_BITS; \
165 regs->psw.addr = new_psw; \
166 regs->gprs[15] = new_stackp; \
167} while (0)
168
169#endif /* __s390x__ */
170
171/* Forward declaration, a strange C thing */
172struct task_struct;
173struct mm_struct;
174
175/* Free all resources held by a thread. */
176extern void release_thread(struct task_struct *);
177extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
178
179/* Prepare to copy thread state - unlazy all lazy status */
180#define prepare_to_copy(tsk) do { } while (0)
181
182/*
183 * Return saved PC of a blocked thread.
184 */
185extern unsigned long thread_saved_pc(struct task_struct *t);
186
187/*
188 * Print register of task into buffer. Used in fs/proc/array.c.
189 */
190extern char *task_show_regs(struct task_struct *task, char *buffer);
191
192extern void show_registers(struct pt_regs *regs);
193extern void show_trace(struct task_struct *task, unsigned long *sp);
194
195unsigned long get_wchan(struct task_struct *p);
196#define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
197 ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
198#define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
199#define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
200
201/*
202 * Give up the time slice of the virtual PU.
203 */
204#ifndef __s390x__
205# define cpu_relax() asm volatile ("diag 0,0,68" : : : "memory")
206#else /* __s390x__ */
207# define cpu_relax() \
208 asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory")
209#endif /* __s390x__ */
210
211/*
212 * Set PSW mask to specified value, while leaving the
213 * PSW addr pointing to the next instruction.
214 */
215
216static inline void __load_psw_mask (unsigned long mask)
217{
218 unsigned long addr;
219
220 psw_t psw;
221 psw.mask = mask;
222
223#ifndef __s390x__
224 asm volatile (
225 " basr %0,0\n"
226 "0: ahi %0,1f-0b\n"
227 " st %0,4(%1)\n"
228 " lpsw 0(%1)\n"
229 "1:"
230 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
231#else /* __s390x__ */
232 asm volatile (
233 " larl %0,1f\n"
234 " stg %0,8(%1)\n"
235 " lpswe 0(%1)\n"
236 "1:"
237 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
238#endif /* __s390x__ */
239}
240
241/*
242 * Function to stop a processor until an interruption occurred
243 */
244static inline void enabled_wait(void)
245{
246 unsigned long reg;
247 psw_t wait_psw;
248
249 wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
250 PSW_MASK_MCHECK | PSW_MASK_WAIT;
251#ifndef __s390x__
252 asm volatile (
253 " basr %0,0\n"
254 "0: la %0,1f-0b(%0)\n"
255 " st %0,4(%1)\n"
256 " oi 4(%1),0x80\n"
257 " lpsw 0(%1)\n"
258 "1:"
259 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
260 : "memory", "cc" );
261#else /* __s390x__ */
262 asm volatile (
263 " larl %0,0f\n"
264 " stg %0,8(%1)\n"
265 " lpswe 0(%1)\n"
266 "0:"
267 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
268 : "memory", "cc" );
269#endif /* __s390x__ */
270}
271
272/*
273 * Function to drop a processor into disabled wait state
274 */
275
276static inline void disabled_wait(unsigned long code)
277{
278 char psw_buffer[2*sizeof(psw_t)];
279 unsigned long ctl_buf;
280 psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
281 & -sizeof(psw_t));
282
283 dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
284 dw_psw->addr = code;
285 /*
286 * Store status and then load disabled wait psw,
287 * the processor is dead afterwards
288 */
289#ifndef __s390x__
290 asm volatile (" stctl 0,0,0(%2)\n"
291 " ni 0(%2),0xef\n" /* switch off protection */
292 " lctl 0,0,0(%2)\n"
293 " stpt 0xd8\n" /* store timer */
294 " stckc 0xe0\n" /* store clock comparator */
295 " stpx 0x108\n" /* store prefix register */
296 " stam 0,15,0x120\n" /* store access registers */
297 " std 0,0x160\n" /* store f0 */
298 " std 2,0x168\n" /* store f2 */
299 " std 4,0x170\n" /* store f4 */
300 " std 6,0x178\n" /* store f6 */
301 " stm 0,15,0x180\n" /* store general registers */
302 " stctl 0,15,0x1c0\n" /* store control registers */
303 " oi 0x1c0,0x10\n" /* fake protection bit */
304 " lpsw 0(%1)"
305 : "=m" (ctl_buf)
306 : "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
307#else /* __s390x__ */
308 asm volatile (" stctg 0,0,0(%2)\n"
309 " ni 4(%2),0xef\n" /* switch off protection */
310 " lctlg 0,0,0(%2)\n"
311 " lghi 1,0x1000\n"
312 " stpt 0x328(1)\n" /* store timer */
313 " stckc 0x330(1)\n" /* store clock comparator */
314 " stpx 0x318(1)\n" /* store prefix register */
315 " stam 0,15,0x340(1)\n" /* store access registers */
316 " stfpc 0x31c(1)\n" /* store fpu control */
317 " std 0,0x200(1)\n" /* store f0 */
318 " std 1,0x208(1)\n" /* store f1 */
319 " std 2,0x210(1)\n" /* store f2 */
320 " std 3,0x218(1)\n" /* store f3 */
321 " std 4,0x220(1)\n" /* store f4 */
322 " std 5,0x228(1)\n" /* store f5 */
323 " std 6,0x230(1)\n" /* store f6 */
324 " std 7,0x238(1)\n" /* store f7 */
325 " std 8,0x240(1)\n" /* store f8 */
326 " std 9,0x248(1)\n" /* store f9 */
327 " std 10,0x250(1)\n" /* store f10 */
328 " std 11,0x258(1)\n" /* store f11 */
329 " std 12,0x260(1)\n" /* store f12 */
330 " std 13,0x268(1)\n" /* store f13 */
331 " std 14,0x270(1)\n" /* store f14 */
332 " std 15,0x278(1)\n" /* store f15 */
333 " stmg 0,15,0x280(1)\n" /* store general registers */
334 " stctg 0,15,0x380(1)\n" /* store control registers */
335 " oi 0x384(1),0x10\n" /* fake protection bit */
336 " lpswe 0(%1)"
337 : "=m" (ctl_buf)
338 : "a" (dw_psw), "a" (&ctl_buf),
339 "m" (dw_psw) : "cc", "0", "1");
340#endif /* __s390x__ */
341}
342
343/*
344 * CPU idle notifier chain.
345 */
346#define CPU_IDLE 0
347#define CPU_NOT_IDLE 1
348
349struct notifier_block;
350int register_idle_notifier(struct notifier_block *nb);
351int unregister_idle_notifier(struct notifier_block *nb);
352
353#endif
354
355#endif /* __ASM_S390_PROCESSOR_H */
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