2 * include/asm-s390/processor.h
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)
9 * Derived from "include/asm-i386/processor.h"
10 * Copyright (C) 1994, Linus Torvalds
13 #ifndef __ASM_S390_PROCESSOR_H
14 #define __ASM_S390_PROCESSOR_H
16 #include <asm/ptrace.h>
20 * Default implementation of macro that returns current
21 * instruction pointer ("program counter").
23 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
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]
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;
39 static inline void get_cpu_id(cpuid_t *ptr)
41 asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
49 unsigned long loops_per_jiffy;
50 unsigned long *pgd_quick;
52 unsigned long *pmd_quick;
53 #endif /* __s390x__ */
54 unsigned long *pte_quick;
55 unsigned long pgtable_cache_sz;
58 extern void s390_adjust_jiffies(void);
59 extern void print_cpu_info(struct cpuinfo_S390 *);
60 extern int get_cpu_capability(unsigned int *);
62 /* Lazy FPU handling on uni-processor */
63 extern struct task_struct *last_task_used_math;
66 * User space process size: 2GB for 31 bit, 4TB for 64 bit.
70 # define TASK_SIZE (0x80000000UL)
71 # define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
72 # define DEFAULT_TASK_SIZE (0x80000000UL)
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)
81 #endif /* __s390x__ */
83 #define HAVE_ARCH_PICK_MMAP_LAYOUT
92 struct thread_struct {
94 unsigned int acrs[NUM_ACRS];
95 unsigned long ksp; /* kernel stack pointer */
96 mm_segment_t mm_segment;
97 unsigned long prot_addr; /* address of protection-excep. */
98 unsigned int error_code; /* error-code of last prog-excep. */
101 /* Used to give failing instruction back to user for ieee exceptions */
102 unsigned long ieee_instruction_pointer;
103 /* pfault_wait is used to block the process on a pfault event */
104 unsigned long pfault_wait;
107 typedef struct thread_struct thread_struct;
110 * Stack layout of a C stack frame.
114 unsigned long back_chain;
115 unsigned long empty1[5];
116 unsigned long gprs[10];
117 unsigned int empty2[8];
121 unsigned long empty1[5];
122 unsigned int empty2[8];
123 unsigned long gprs[10];
124 unsigned long back_chain;
128 #define ARCH_MIN_TASKALIGN 8
130 #define INIT_THREAD { \
131 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
135 * Do necessary setup to start up a new thread.
139 #define start_thread(regs, new_psw, new_stackp) do { \
141 regs->psw.mask = psw_user_bits; \
142 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
143 regs->gprs[15] = new_stackp ; \
146 #else /* __s390x__ */
148 #define start_thread(regs, new_psw, new_stackp) do { \
150 regs->psw.mask = psw_user_bits; \
151 regs->psw.addr = new_psw; \
152 regs->gprs[15] = new_stackp; \
155 #define start_thread31(regs, new_psw, new_stackp) do { \
157 regs->psw.mask = psw_user32_bits; \
158 regs->psw.addr = new_psw; \
159 regs->gprs[15] = new_stackp; \
162 #endif /* __s390x__ */
164 /* Forward declaration, a strange C thing */
168 /* Free all resources held by a thread. */
169 extern void release_thread(struct task_struct *);
170 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
172 /* Prepare to copy thread state - unlazy all lazy status */
173 #define prepare_to_copy(tsk) do { } while (0)
176 * Return saved PC of a blocked thread.
178 extern unsigned long thread_saved_pc(struct task_struct *t);
181 * Print register of task into buffer. Used in fs/proc/array.c.
183 extern char *task_show_regs(struct task_struct *task, char *buffer);
185 extern void show_registers(struct pt_regs *regs);
186 extern void show_code(struct pt_regs *regs);
187 extern void show_trace(struct task_struct *task, unsigned long *sp);
189 unsigned long get_wchan(struct task_struct *p);
190 #define task_pt_regs(tsk) ((struct pt_regs *) \
191 (task_stack_page(tsk) + THREAD_SIZE) - 1)
192 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
193 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
196 * Give up the time slice of the virtual PU.
198 static inline void cpu_relax(void)
200 if (MACHINE_HAS_DIAG44)
201 asm volatile("diag 0,0,68");
205 static inline void psw_set_key(unsigned int key)
207 asm volatile("spka 0(%0)" : : "d" (key));
211 * Set PSW to specified value.
213 static inline void __load_psw(psw_t psw)
216 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
218 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
223 * Set PSW mask to specified value, while leaving the
224 * PSW addr pointing to the next instruction.
227 static inline void __load_psw_mask (unsigned long mask)
241 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
242 #else /* __s390x__ */
248 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
249 #endif /* __s390x__ */
253 * Function to stop a processor until an interruption occurred
255 static inline void enabled_wait(void)
257 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
258 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
262 * Function to drop a processor into disabled wait state
265 static inline void disabled_wait(unsigned long code)
267 unsigned long ctl_buf;
270 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
273 * Store status and then load disabled wait psw,
274 * the processor is dead afterwards
279 " ni 0(%2),0xef\n" /* switch off protection */
281 " stpt 0xd8\n" /* store timer */
282 " stckc 0xe0\n" /* store clock comparator */
283 " stpx 0x108\n" /* store prefix register */
284 " stam 0,15,0x120\n" /* store access registers */
285 " std 0,0x160\n" /* store f0 */
286 " std 2,0x168\n" /* store f2 */
287 " std 4,0x170\n" /* store f4 */
288 " std 6,0x178\n" /* store f6 */
289 " stm 0,15,0x180\n" /* store general registers */
290 " stctl 0,15,0x1c0\n" /* store control registers */
291 " oi 0x1c0,0x10\n" /* fake protection bit */
294 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
295 #else /* __s390x__ */
298 " ni 4(%2),0xef\n" /* switch off protection */
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 */
327 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
328 #endif /* __s390x__ */
332 * Basic Machine Check/Program Check Handler.
335 extern void s390_base_mcck_handler(void);
336 extern void s390_base_pgm_handler(void);
337 extern void s390_base_ext_handler(void);
339 extern void (*s390_base_mcck_handler_fn)(void);
340 extern void (*s390_base_pgm_handler_fn)(void);
341 extern void (*s390_base_ext_handler_fn)(void);
344 * CPU idle notifier chain.
346 #define S390_CPU_IDLE 0
347 #define S390_CPU_NOT_IDLE 1
349 struct notifier_block;
350 int register_idle_notifier(struct notifier_block *nb);
351 int unregister_idle_notifier(struct notifier_block *nb);
353 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
358 * Helper macro for exception table entries
361 #define EX_TABLE(_fault,_target) \
362 ".section __ex_table,\"a\"\n" \
364 " .long " #_fault "," #_target "\n" \
367 #define EX_TABLE(_fault,_target) \
368 ".section __ex_table,\"a\"\n" \
370 " .quad " #_fault "," #_target "\n" \
374 #endif /* __ASM_S390_PROCESSOR_H */