2 * include/asm-s390/processor.h
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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 void print_cpu_info(void);
36 extern int get_cpu_capability(unsigned int *);
39 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
43 #define TASK_SIZE (1UL << 31)
44 #define TASK_UNMAPPED_BASE (1UL << 30)
48 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
49 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
50 (1UL << 30) : (1UL << 41))
51 #define TASK_SIZE TASK_SIZE_OF(current)
53 #endif /* __s390x__ */
58 #define STACK_TOP (1UL << 31)
59 #define STACK_TOP_MAX (1UL << 31)
61 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
62 #define STACK_TOP_MAX (1UL << 42)
63 #endif /* __s390x__ */
68 #define HAVE_ARCH_PICK_MMAP_LAYOUT
77 struct thread_struct {
79 unsigned int acrs[NUM_ACRS];
80 unsigned long ksp; /* kernel stack pointer */
81 mm_segment_t mm_segment;
82 unsigned long prot_addr; /* address of protection-excep. */
85 /* pfault_wait is used to block the process on a pfault event */
86 unsigned long pfault_wait;
89 typedef struct thread_struct thread_struct;
92 * Stack layout of a C stack frame.
96 unsigned long back_chain;
97 unsigned long empty1[5];
98 unsigned long gprs[10];
99 unsigned int empty2[8];
103 unsigned long empty1[5];
104 unsigned int empty2[8];
105 unsigned long gprs[10];
106 unsigned long back_chain;
110 #define ARCH_MIN_TASKALIGN 8
112 #define INIT_THREAD { \
113 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
117 * Do necessary setup to start up a new thread.
119 #define start_thread(regs, new_psw, new_stackp) do { \
121 regs->psw.mask = psw_user_bits; \
122 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
123 regs->gprs[15] = new_stackp; \
126 #define start_thread31(regs, new_psw, new_stackp) do { \
128 regs->psw.mask = psw_user32_bits; \
129 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
130 regs->gprs[15] = new_stackp; \
131 crst_table_downgrade(current->mm, 1UL << 31); \
134 /* Forward declaration, a strange C thing */
139 /* Free all resources held by a thread. */
140 extern void release_thread(struct task_struct *);
141 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
143 /* Prepare to copy thread state - unlazy all lazy status */
144 #define prepare_to_copy(tsk) do { } while (0)
147 * Return saved PC of a blocked thread.
149 extern unsigned long thread_saved_pc(struct task_struct *t);
152 * Print register of task into buffer. Used in fs/proc/array.c.
154 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
156 extern void show_code(struct pt_regs *regs);
158 unsigned long get_wchan(struct task_struct *p);
159 #define task_pt_regs(tsk) ((struct pt_regs *) \
160 (task_stack_page(tsk) + THREAD_SIZE) - 1)
161 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
162 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
165 * Give up the time slice of the virtual PU.
167 static inline void cpu_relax(void)
169 if (MACHINE_HAS_DIAG44)
170 asm volatile("diag 0,0,68");
174 static inline void psw_set_key(unsigned int key)
176 asm volatile("spka 0(%0)" : : "d" (key));
180 * Set PSW to specified value.
182 static inline void __load_psw(psw_t psw)
185 asm volatile("lpsw %0" : : "Q" (psw) : "cc");
187 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
192 * Set PSW mask to specified value, while leaving the
193 * PSW addr pointing to the next instruction.
196 static inline void __load_psw_mask (unsigned long mask)
207 " st %0,%O1+4(%R1)\n"
210 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
211 #else /* __s390x__ */
214 " stg %0,%O1+8(%R1)\n"
217 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
218 #endif /* __s390x__ */
222 * Function to stop a processor until an interruption occurred
224 static inline void enabled_wait(void)
226 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
227 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
231 * Function to drop a processor into disabled wait state
234 static inline void ATTRIB_NORET disabled_wait(unsigned long code)
236 unsigned long ctl_buf;
239 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
242 * Store status and then load disabled wait psw,
243 * the processor is dead afterwards
248 " ni 0(%2),0xef\n" /* switch off protection */
250 " stpt 0xd8\n" /* store timer */
251 " stckc 0xe0\n" /* store clock comparator */
252 " stpx 0x108\n" /* store prefix register */
253 " stam 0,15,0x120\n" /* store access registers */
254 " std 0,0x160\n" /* store f0 */
255 " std 2,0x168\n" /* store f2 */
256 " std 4,0x170\n" /* store f4 */
257 " std 6,0x178\n" /* store f6 */
258 " stm 0,15,0x180\n" /* store general registers */
259 " stctl 0,15,0x1c0\n" /* store control registers */
260 " oi 0x1c0,0x10\n" /* fake protection bit */
263 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
264 #else /* __s390x__ */
267 " ni 4(%2),0xef\n" /* switch off protection */
270 " stpt 0x328(1)\n" /* store timer */
271 " stckc 0x330(1)\n" /* store clock comparator */
272 " stpx 0x318(1)\n" /* store prefix register */
273 " stam 0,15,0x340(1)\n"/* store access registers */
274 " stfpc 0x31c(1)\n" /* store fpu control */
275 " std 0,0x200(1)\n" /* store f0 */
276 " std 1,0x208(1)\n" /* store f1 */
277 " std 2,0x210(1)\n" /* store f2 */
278 " std 3,0x218(1)\n" /* store f3 */
279 " std 4,0x220(1)\n" /* store f4 */
280 " std 5,0x228(1)\n" /* store f5 */
281 " std 6,0x230(1)\n" /* store f6 */
282 " std 7,0x238(1)\n" /* store f7 */
283 " std 8,0x240(1)\n" /* store f8 */
284 " std 9,0x248(1)\n" /* store f9 */
285 " std 10,0x250(1)\n" /* store f10 */
286 " std 11,0x258(1)\n" /* store f11 */
287 " std 12,0x260(1)\n" /* store f12 */
288 " std 13,0x268(1)\n" /* store f13 */
289 " std 14,0x270(1)\n" /* store f14 */
290 " std 15,0x278(1)\n" /* store f15 */
291 " stmg 0,15,0x280(1)\n"/* store general registers */
292 " stctg 0,15,0x380(1)\n"/* store control registers */
293 " oi 0x384(1),0x10\n"/* fake protection bit */
296 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
297 #endif /* __s390x__ */
302 * Basic Machine Check/Program Check Handler.
305 extern void s390_base_mcck_handler(void);
306 extern void s390_base_pgm_handler(void);
307 extern void s390_base_ext_handler(void);
309 extern void (*s390_base_mcck_handler_fn)(void);
310 extern void (*s390_base_pgm_handler_fn)(void);
311 extern void (*s390_base_ext_handler_fn)(void);
313 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
318 * Helper macro for exception table entries
321 #define EX_TABLE(_fault,_target) \
322 ".section __ex_table,\"a\"\n" \
324 " .long " #_fault "," #_target "\n" \
327 #define EX_TABLE(_fault,_target) \
328 ".section __ex_table,\"a\"\n" \
330 " .quad " #_fault "," #_target "\n" \
334 #endif /* __ASM_S390_PROCESSOR_H */