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>
17 #include <asm/ptrace.h>
21 * Default implementation of macro that returns current
22 * instruction pointer ("program counter").
24 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
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]
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;
40 static inline void get_cpu_id(cpuid_t *ptr)
42 asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
45 extern void s390_adjust_jiffies(void);
46 extern void print_cpu_info(void);
47 extern int get_cpu_capability(unsigned int *);
50 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
54 #define TASK_SIZE (1UL << 31)
55 #define TASK_UNMAPPED_BASE (1UL << 30)
59 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
60 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
61 (1UL << 30) : (1UL << 41))
62 #define TASK_SIZE TASK_SIZE_OF(current)
64 #endif /* __s390x__ */
69 #define STACK_TOP (1UL << 31)
70 #define STACK_TOP_MAX (1UL << 31)
72 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
73 #define STACK_TOP_MAX (1UL << 42)
74 #endif /* __s390x__ */
79 #define HAVE_ARCH_PICK_MMAP_LAYOUT
88 struct thread_struct {
90 unsigned int acrs[NUM_ACRS];
91 unsigned long ksp; /* kernel stack pointer */
92 mm_segment_t mm_segment;
93 unsigned long prot_addr; /* address of protection-excep. */
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;
102 typedef struct thread_struct thread_struct;
105 * Stack layout of a C stack frame.
109 unsigned long back_chain;
110 unsigned long empty1[5];
111 unsigned long gprs[10];
112 unsigned int empty2[8];
116 unsigned long empty1[5];
117 unsigned int empty2[8];
118 unsigned long gprs[10];
119 unsigned long back_chain;
123 #define ARCH_MIN_TASKALIGN 8
125 #define INIT_THREAD { \
126 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
130 * Do necessary setup to start up a new thread.
132 #define start_thread(regs, new_psw, new_stackp) do { \
134 regs->psw.mask = psw_user_bits; \
135 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
136 regs->gprs[15] = new_stackp; \
139 #define start_thread31(regs, new_psw, new_stackp) do { \
141 regs->psw.mask = psw_user32_bits; \
142 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
143 regs->gprs[15] = new_stackp; \
144 crst_table_downgrade(current->mm, 1UL << 31); \
147 /* Forward declaration, a strange C thing */
152 /* Free all resources held by a thread. */
153 extern void release_thread(struct task_struct *);
154 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
156 /* Prepare to copy thread state - unlazy all lazy status */
157 #define prepare_to_copy(tsk) do { } while (0)
160 * Return saved PC of a blocked thread.
162 extern unsigned long thread_saved_pc(struct task_struct *t);
165 * Print register of task into buffer. Used in fs/proc/array.c.
167 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
169 extern void show_code(struct pt_regs *regs);
171 unsigned long get_wchan(struct task_struct *p);
172 #define task_pt_regs(tsk) ((struct pt_regs *) \
173 (task_stack_page(tsk) + THREAD_SIZE) - 1)
174 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
175 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
178 * Give up the time slice of the virtual PU.
180 static inline void cpu_relax(void)
182 if (MACHINE_HAS_DIAG44)
183 asm volatile("diag 0,0,68");
187 static inline void psw_set_key(unsigned int key)
189 asm volatile("spka 0(%0)" : : "d" (key));
193 * Set PSW to specified value.
195 static inline void __load_psw(psw_t psw)
198 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
200 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
205 * Set PSW mask to specified value, while leaving the
206 * PSW addr pointing to the next instruction.
209 static inline void __load_psw_mask (unsigned long mask)
223 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
224 #else /* __s390x__ */
230 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
231 #endif /* __s390x__ */
235 * Function to stop a processor until an interruption occurred
237 static inline void enabled_wait(void)
239 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
240 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
244 * Function to drop a processor into disabled wait state
247 static inline void ATTRIB_NORET disabled_wait(unsigned long code)
249 unsigned long ctl_buf;
252 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
255 * Store status and then load disabled wait psw,
256 * the processor is dead afterwards
261 " ni 0(%2),0xef\n" /* switch off protection */
263 " stpt 0xd8\n" /* store timer */
264 " stckc 0xe0\n" /* store clock comparator */
265 " stpx 0x108\n" /* store prefix register */
266 " stam 0,15,0x120\n" /* store access registers */
267 " std 0,0x160\n" /* store f0 */
268 " std 2,0x168\n" /* store f2 */
269 " std 4,0x170\n" /* store f4 */
270 " std 6,0x178\n" /* store f6 */
271 " stm 0,15,0x180\n" /* store general registers */
272 " stctl 0,15,0x1c0\n" /* store control registers */
273 " oi 0x1c0,0x10\n" /* fake protection bit */
276 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
277 #else /* __s390x__ */
280 " ni 4(%2),0xef\n" /* switch off protection */
283 " stpt 0x328(1)\n" /* store timer */
284 " stckc 0x330(1)\n" /* store clock comparator */
285 " stpx 0x318(1)\n" /* store prefix register */
286 " stam 0,15,0x340(1)\n"/* store access registers */
287 " stfpc 0x31c(1)\n" /* store fpu control */
288 " std 0,0x200(1)\n" /* store f0 */
289 " std 1,0x208(1)\n" /* store f1 */
290 " std 2,0x210(1)\n" /* store f2 */
291 " std 3,0x218(1)\n" /* store f3 */
292 " std 4,0x220(1)\n" /* store f4 */
293 " std 5,0x228(1)\n" /* store f5 */
294 " std 6,0x230(1)\n" /* store f6 */
295 " std 7,0x238(1)\n" /* store f7 */
296 " std 8,0x240(1)\n" /* store f8 */
297 " std 9,0x248(1)\n" /* store f9 */
298 " std 10,0x250(1)\n" /* store f10 */
299 " std 11,0x258(1)\n" /* store f11 */
300 " std 12,0x260(1)\n" /* store f12 */
301 " std 13,0x268(1)\n" /* store f13 */
302 " std 14,0x270(1)\n" /* store f14 */
303 " std 15,0x278(1)\n" /* store f15 */
304 " stmg 0,15,0x280(1)\n"/* store general registers */
305 " stctg 0,15,0x380(1)\n"/* store control registers */
306 " oi 0x384(1),0x10\n"/* fake protection bit */
309 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
310 #endif /* __s390x__ */
315 * Basic Machine Check/Program Check Handler.
318 extern void s390_base_mcck_handler(void);
319 extern void s390_base_pgm_handler(void);
320 extern void s390_base_ext_handler(void);
322 extern void (*s390_base_mcck_handler_fn)(void);
323 extern void (*s390_base_pgm_handler_fn)(void);
324 extern void (*s390_base_ext_handler_fn)(void);
326 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
331 * Helper macro for exception table entries
334 #define EX_TABLE(_fault,_target) \
335 ".section __ex_table,\"a\"\n" \
337 " .long " #_fault "," #_target "\n" \
340 #define EX_TABLE(_fault,_target) \
341 ".section __ex_table,\"a\"\n" \
343 " .quad " #_fault "," #_target "\n" \
347 #endif /* __ASM_S390_PROCESSOR_H */