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 <linux/linkage.h>
19 #include <asm/ptrace.h>
20 #include <asm/setup.h>
24 * Default implementation of macro that returns current
25 * instruction pointer ("program counter").
27 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
29 static inline void get_cpu_id(struct cpuid *ptr)
31 asm volatile("stidp %0" : "=Q" (*ptr));
34 extern void s390_adjust_jiffies(void);
35 extern int get_cpu_capability(unsigned int *);
36 extern const struct seq_operations cpuinfo_op;
37 extern int sysctl_ieee_emulation_warnings;
40 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
44 #define TASK_SIZE (1UL << 31)
45 #define TASK_UNMAPPED_BASE (1UL << 30)
49 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
50 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
51 (1UL << 30) : (1UL << 41))
52 #define TASK_SIZE TASK_SIZE_OF(current)
54 #endif /* __s390x__ */
59 #define STACK_TOP (1UL << 31)
60 #define STACK_TOP_MAX (1UL << 31)
62 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
63 #define STACK_TOP_MAX (1UL << 42)
64 #endif /* __s390x__ */
69 #define HAVE_ARCH_PICK_MMAP_LAYOUT
78 struct thread_struct {
80 unsigned int acrs[NUM_ACRS];
81 unsigned long ksp; /* kernel stack pointer */
82 mm_segment_t mm_segment;
83 unsigned long prot_addr; /* address of protection-excep. */
85 unsigned long gmap_addr; /* address of last gmap fault. */
86 struct per_regs per_user; /* User specified PER registers */
87 struct per_event per_event; /* Cause of the last PER trap */
88 /* pfault_wait is used to block the process on a pfault event */
89 unsigned long pfault_wait;
90 struct list_head list;
93 typedef struct thread_struct thread_struct;
96 * Stack layout of a C stack frame.
100 unsigned long back_chain;
101 unsigned long empty1[5];
102 unsigned long gprs[10];
103 unsigned int empty2[8];
107 unsigned long empty1[5];
108 unsigned int empty2[8];
109 unsigned long gprs[10];
110 unsigned long back_chain;
114 #define ARCH_MIN_TASKALIGN 8
116 #define INIT_THREAD { \
117 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
121 * Do necessary setup to start up a new thread.
123 #define start_thread(regs, new_psw, new_stackp) do { \
124 regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
125 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
126 regs->gprs[15] = new_stackp; \
129 #define start_thread31(regs, new_psw, new_stackp) do { \
130 regs->psw.mask = psw_user_bits | PSW_MASK_BA; \
131 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
132 regs->gprs[15] = new_stackp; \
133 __tlb_flush_mm(current->mm); \
134 crst_table_downgrade(current->mm, 1UL << 31); \
135 update_mm(current->mm, current); \
138 /* Forward declaration, a strange C thing */
143 /* Free all resources held by a thread. */
144 extern void release_thread(struct task_struct *);
145 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
147 /* Prepare to copy thread state - unlazy all lazy status */
148 #define prepare_to_copy(tsk) do { } while (0)
151 * Return saved PC of a blocked thread.
153 extern unsigned long thread_saved_pc(struct task_struct *t);
155 extern void show_code(struct pt_regs *regs);
157 unsigned long get_wchan(struct task_struct *p);
158 #define task_pt_regs(tsk) ((struct pt_regs *) \
159 (task_stack_page(tsk) + THREAD_SIZE) - 1)
160 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
161 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
164 * Give up the time slice of the virtual PU.
166 static inline void cpu_relax(void)
168 if (MACHINE_HAS_DIAG44)
169 asm volatile("diag 0,0,68");
173 static inline void psw_set_key(unsigned int key)
175 asm volatile("spka 0(%0)" : : "d" (key));
179 * Set PSW to specified value.
181 static inline void __load_psw(psw_t psw)
184 asm volatile("lpsw %0" : : "Q" (psw) : "cc");
186 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
191 * Set PSW mask to specified value, while leaving the
192 * PSW addr pointing to the next instruction.
194 static inline void __load_psw_mask (unsigned long mask)
205 " st %0,%O1+4(%R1)\n"
208 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
209 #else /* __s390x__ */
212 " stg %0,%O1+8(%R1)\n"
215 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
216 #endif /* __s390x__ */
220 * Rewind PSW instruction address by specified number of bytes.
222 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
225 if (psw.addr & PSW_ADDR_AMODE)
227 return (psw.addr - ilc) | PSW_ADDR_AMODE;
229 return (psw.addr - ilc) & ((1UL << 24) - 1);
233 mask = (psw.mask & PSW_MASK_EA) ? -1UL :
234 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
236 return (psw.addr - ilc) & mask;
241 * Function to drop a processor into disabled wait state
243 static inline void ATTRIB_NORET disabled_wait(unsigned long code)
245 unsigned long ctl_buf;
248 dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
251 * Store status and then load disabled wait psw,
252 * the processor is dead afterwards
257 " ni 0(%2),0xef\n" /* switch off protection */
259 " stpt 0xd8\n" /* store timer */
260 " stckc 0xe0\n" /* store clock comparator */
261 " stpx 0x108\n" /* store prefix register */
262 " stam 0,15,0x120\n" /* store access registers */
263 " std 0,0x160\n" /* store f0 */
264 " std 2,0x168\n" /* store f2 */
265 " std 4,0x170\n" /* store f4 */
266 " std 6,0x178\n" /* store f6 */
267 " stm 0,15,0x180\n" /* store general registers */
268 " stctl 0,15,0x1c0\n" /* store control registers */
269 " oi 0x1c0,0x10\n" /* fake protection bit */
272 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
273 #else /* __s390x__ */
276 " ni 4(%2),0xef\n" /* switch off protection */
279 " stpt 0x328(1)\n" /* store timer */
280 " stckc 0x330(1)\n" /* store clock comparator */
281 " stpx 0x318(1)\n" /* store prefix register */
282 " stam 0,15,0x340(1)\n"/* store access registers */
283 " stfpc 0x31c(1)\n" /* store fpu control */
284 " std 0,0x200(1)\n" /* store f0 */
285 " std 1,0x208(1)\n" /* store f1 */
286 " std 2,0x210(1)\n" /* store f2 */
287 " std 3,0x218(1)\n" /* store f3 */
288 " std 4,0x220(1)\n" /* store f4 */
289 " std 5,0x228(1)\n" /* store f5 */
290 " std 6,0x230(1)\n" /* store f6 */
291 " std 7,0x238(1)\n" /* store f7 */
292 " std 8,0x240(1)\n" /* store f8 */
293 " std 9,0x248(1)\n" /* store f9 */
294 " std 10,0x250(1)\n" /* store f10 */
295 " std 11,0x258(1)\n" /* store f11 */
296 " std 12,0x260(1)\n" /* store f12 */
297 " std 13,0x268(1)\n" /* store f13 */
298 " std 14,0x270(1)\n" /* store f14 */
299 " std 15,0x278(1)\n" /* store f15 */
300 " stmg 0,15,0x280(1)\n"/* store general registers */
301 " stctg 0,15,0x380(1)\n"/* store control registers */
302 " oi 0x384(1),0x10\n"/* fake protection bit */
305 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
306 #endif /* __s390x__ */
311 * Basic Machine Check/Program Check Handler.
314 extern void s390_base_mcck_handler(void);
315 extern void s390_base_pgm_handler(void);
316 extern void s390_base_ext_handler(void);
318 extern void (*s390_base_mcck_handler_fn)(void);
319 extern void (*s390_base_pgm_handler_fn)(void);
320 extern void (*s390_base_ext_handler_fn)(void);
322 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
327 * Helper macro for exception table entries
330 #define EX_TABLE(_fault,_target) \
331 ".section __ex_table,\"a\"\n" \
333 " .long " #_fault "," #_target "\n" \
336 #define EX_TABLE(_fault,_target) \
337 ".section __ex_table,\"a\"\n" \
339 " .quad " #_fault "," #_target "\n" \
343 #endif /* __ASM_S390_PROCESSOR_H */