3 * Copyright IBM Corp. 1999
7 * Derived from "include/asm-i386/processor.h"
8 * Copyright (C) 1994, Linus Torvalds
11 #ifndef __ASM_S390_PROCESSOR_H
12 #define __ASM_S390_PROCESSOR_H
14 #include <linux/linkage.h>
15 #include <linux/irqflags.h>
18 #include <asm/ptrace.h>
19 #include <asm/setup.h>
22 * Default implementation of macro that returns current
23 * instruction pointer ("program counter").
25 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
27 static inline void get_cpu_id(struct cpuid *ptr)
29 asm volatile("stidp %0" : "=Q" (*ptr));
32 extern void s390_adjust_jiffies(void);
33 extern const struct seq_operations cpuinfo_op;
34 extern int sysctl_ieee_emulation_warnings;
35 extern void execve_tail(void);
38 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
42 #define TASK_SIZE (1UL << 31)
43 #define TASK_UNMAPPED_BASE (1UL << 30)
45 #else /* CONFIG_64BIT */
47 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
48 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
49 (1UL << 30) : (1UL << 41))
50 #define TASK_SIZE TASK_SIZE_OF(current)
52 #endif /* CONFIG_64BIT */
55 #define STACK_TOP (1UL << 31)
56 #define STACK_TOP_MAX (1UL << 31)
57 #else /* CONFIG_64BIT */
58 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
59 #define STACK_TOP_MAX (1UL << 42)
60 #endif /* CONFIG_64BIT */
62 #define HAVE_ARCH_PICK_MMAP_LAYOUT
71 struct thread_struct {
73 unsigned int acrs[NUM_ACRS];
74 unsigned long ksp; /* kernel stack pointer */
75 mm_segment_t mm_segment;
76 unsigned long gmap_addr; /* address of last gmap fault. */
77 struct per_regs per_user; /* User specified PER registers */
78 struct per_event per_event; /* Cause of the last PER trap */
79 /* pfault_wait is used to block the process on a pfault event */
80 unsigned long pfault_wait;
81 struct list_head list;
84 typedef struct thread_struct thread_struct;
87 * Stack layout of a C stack frame.
91 unsigned long back_chain;
92 unsigned long empty1[5];
93 unsigned long gprs[10];
94 unsigned int empty2[8];
98 unsigned long empty1[5];
99 unsigned int empty2[8];
100 unsigned long gprs[10];
101 unsigned long back_chain;
105 #define ARCH_MIN_TASKALIGN 8
107 #define INIT_THREAD { \
108 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
112 * Do necessary setup to start up a new thread.
114 #define start_thread(regs, new_psw, new_stackp) do { \
115 regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
116 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
117 regs->gprs[15] = new_stackp; \
121 #define start_thread31(regs, new_psw, new_stackp) do { \
122 regs->psw.mask = psw_user_bits | PSW_MASK_BA; \
123 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
124 regs->gprs[15] = new_stackp; \
125 __tlb_flush_mm(current->mm); \
126 crst_table_downgrade(current->mm, 1UL << 31); \
127 update_mm(current->mm, current); \
131 /* Forward declaration, a strange C thing */
136 /* Free all resources held by a thread. */
137 extern void release_thread(struct task_struct *);
140 * Return saved PC of a blocked thread.
142 extern unsigned long thread_saved_pc(struct task_struct *t);
144 extern void show_code(struct pt_regs *regs);
146 unsigned long get_wchan(struct task_struct *p);
147 #define task_pt_regs(tsk) ((struct pt_regs *) \
148 (task_stack_page(tsk) + THREAD_SIZE) - 1)
149 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
150 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
152 static inline unsigned short stap(void)
154 unsigned short cpu_address;
156 asm volatile("stap %0" : "=m" (cpu_address));
161 * Give up the time slice of the virtual PU.
163 static inline void cpu_relax(void)
165 if (MACHINE_HAS_DIAG44)
166 asm volatile("diag 0,0,68");
170 static inline void psw_set_key(unsigned int key)
172 asm volatile("spka 0(%0)" : : "d" (key));
176 * Set PSW to specified value.
178 static inline void __load_psw(psw_t psw)
181 asm volatile("lpsw %0" : : "Q" (psw) : "cc");
183 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
188 * Set PSW mask to specified value, while leaving the
189 * PSW addr pointing to the next instruction.
191 static inline void __load_psw_mask (unsigned long mask)
202 " st %0,%O1+4(%R1)\n"
205 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
206 #else /* CONFIG_64BIT */
209 " stg %0,%O1+8(%R1)\n"
212 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
213 #endif /* CONFIG_64BIT */
217 * Rewind PSW instruction address by specified number of bytes.
219 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
222 if (psw.addr & PSW_ADDR_AMODE)
224 return (psw.addr - ilc) | PSW_ADDR_AMODE;
226 return (psw.addr - ilc) & ((1UL << 24) - 1);
230 mask = (psw.mask & PSW_MASK_EA) ? -1UL :
231 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
233 return (psw.addr - ilc) & mask;
238 * Function to drop a processor into disabled wait state
240 static inline void __noreturn disabled_wait(unsigned long code)
242 unsigned long ctl_buf;
245 dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
248 * Store status and then load disabled wait psw,
249 * the processor is dead afterwards
254 " ni 0(%2),0xef\n" /* switch off protection */
256 " stpt 0xd8\n" /* store timer */
257 " stckc 0xe0\n" /* store clock comparator */
258 " stpx 0x108\n" /* store prefix register */
259 " stam 0,15,0x120\n" /* store access registers */
260 " std 0,0x160\n" /* store f0 */
261 " std 2,0x168\n" /* store f2 */
262 " std 4,0x170\n" /* store f4 */
263 " std 6,0x178\n" /* store f6 */
264 " stm 0,15,0x180\n" /* store general registers */
265 " stctl 0,15,0x1c0\n" /* store control registers */
266 " oi 0x1c0,0x10\n" /* fake protection bit */
269 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
270 #else /* CONFIG_64BIT */
273 " ni 4(%2),0xef\n" /* switch off protection */
276 " stpt 0x328(1)\n" /* store timer */
277 " stckc 0x330(1)\n" /* store clock comparator */
278 " stpx 0x318(1)\n" /* store prefix register */
279 " stam 0,15,0x340(1)\n"/* store access registers */
280 " stfpc 0x31c(1)\n" /* store fpu control */
281 " std 0,0x200(1)\n" /* store f0 */
282 " std 1,0x208(1)\n" /* store f1 */
283 " std 2,0x210(1)\n" /* store f2 */
284 " std 3,0x218(1)\n" /* store f3 */
285 " std 4,0x220(1)\n" /* store f4 */
286 " std 5,0x228(1)\n" /* store f5 */
287 " std 6,0x230(1)\n" /* store f6 */
288 " std 7,0x238(1)\n" /* store f7 */
289 " std 8,0x240(1)\n" /* store f8 */
290 " std 9,0x248(1)\n" /* store f9 */
291 " std 10,0x250(1)\n" /* store f10 */
292 " std 11,0x258(1)\n" /* store f11 */
293 " std 12,0x260(1)\n" /* store f12 */
294 " std 13,0x268(1)\n" /* store f13 */
295 " std 14,0x270(1)\n" /* store f14 */
296 " std 15,0x278(1)\n" /* store f15 */
297 " stmg 0,15,0x280(1)\n"/* store general registers */
298 " stctg 0,15,0x380(1)\n"/* store control registers */
299 " oi 0x384(1),0x10\n"/* fake protection bit */
302 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1");
303 #endif /* CONFIG_64BIT */
308 * Use to set psw mask except for the first byte which
309 * won't be changed by this function.
312 __set_psw_mask(unsigned long mask)
314 __load_psw_mask(mask | (arch_local_save_flags() & ~(-1UL >> 8)));
317 #define local_mcck_enable() \
318 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
319 #define local_mcck_disable() \
320 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)
323 * Basic Machine Check/Program Check Handler.
326 extern void s390_base_mcck_handler(void);
327 extern void s390_base_pgm_handler(void);
328 extern void s390_base_ext_handler(void);
330 extern void (*s390_base_mcck_handler_fn)(void);
331 extern void (*s390_base_pgm_handler_fn)(void);
332 extern void (*s390_base_ext_handler_fn)(void);
334 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
337 * Helper macro for exception table entries
340 #define EX_TABLE(_fault,_target) \
341 ".section __ex_table,\"a\"\n" \
343 " .long " #_fault "," #_target "\n" \
346 #define EX_TABLE(_fault,_target) \
347 ".section __ex_table,\"a\"\n" \
349 " .quad " #_fault "," #_target "\n" \
353 extern int memcpy_real(void *, void *, size_t);
354 extern void memcpy_absolute(void *, void *, size_t);
356 #define mem_assign_absolute(dest, val) { \
357 __typeof__(dest) __tmp = (val); \
359 BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
360 memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
363 #endif /* __ASM_S390_PROCESSOR_H */