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;
44 unsigned long loops_per_jiffy;
45 unsigned long *pgd_quick;
47 unsigned long *pmd_quick;
48 #endif /* __s390x__ */
49 unsigned long *pte_quick;
50 unsigned long pgtable_cache_sz;
53 extern void print_cpu_info(struct cpuinfo_S390 *);
55 /* Lazy FPU handling on uni-processor */
56 extern struct task_struct *last_task_used_math;
59 * User space process size: 2GB for 31 bit, 4TB for 64 bit.
63 # define TASK_SIZE (0x80000000UL)
64 # define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
65 # define DEFAULT_TASK_SIZE (0x80000000UL)
69 # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \
70 (0x80000000UL) : (0x40000000000UL))
71 # define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
72 # define DEFAULT_TASK_SIZE (0x40000000000UL)
74 #endif /* __s390x__ */
76 #define HAVE_ARCH_PICK_MMAP_LAYOUT
85 struct thread_struct {
87 unsigned int acrs[NUM_ACRS];
88 unsigned long ksp; /* kernel stack pointer */
89 unsigned long user_seg; /* HSTD */
90 mm_segment_t mm_segment;
91 unsigned long prot_addr; /* address of protection-excep. */
92 unsigned int error_code; /* error-code of last prog-excep. */
95 /* Used to give failing instruction back to user for ieee exceptions */
96 unsigned long ieee_instruction_pointer;
97 /* pfault_wait is used to block the process on a pfault event */
98 unsigned long pfault_wait;
101 typedef struct thread_struct thread_struct;
104 * Stack layout of a C stack frame.
108 unsigned long back_chain;
109 unsigned long empty1[5];
110 unsigned long gprs[10];
111 unsigned int empty2[8];
115 unsigned long empty1[5];
116 unsigned int empty2[8];
117 unsigned long gprs[10];
118 unsigned long back_chain;
122 #define ARCH_MIN_TASKALIGN 8
125 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
126 #else /* __s390x__ */
127 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
128 #endif /* __s390x__ */
130 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
131 {0},{0},{0},{0},{0},{0}}}, \
132 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
133 sizeof(init_stack) + (unsigned long) &init_stack, \
137 (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
142 * Do necessary setup to start up a new thread.
146 #define start_thread(regs, new_psw, new_stackp) do { \
147 regs->psw.mask = PSW_USER_BITS; \
148 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
149 regs->gprs[15] = new_stackp ; \
152 #else /* __s390x__ */
154 #define start_thread(regs, new_psw, new_stackp) do { \
155 regs->psw.mask = PSW_USER_BITS; \
156 regs->psw.addr = new_psw; \
157 regs->gprs[15] = new_stackp; \
160 #define start_thread31(regs, new_psw, new_stackp) do { \
161 regs->psw.mask = PSW_USER32_BITS; \
162 regs->psw.addr = new_psw; \
163 regs->gprs[15] = new_stackp; \
166 #endif /* __s390x__ */
168 /* Forward declaration, a strange C thing */
172 /* Free all resources held by a thread. */
173 extern void release_thread(struct task_struct *);
174 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
176 /* Prepare to copy thread state - unlazy all lazy status */
177 #define prepare_to_copy(tsk) do { } while (0)
180 * Return saved PC of a blocked thread.
182 extern unsigned long thread_saved_pc(struct task_struct *t);
185 * Print register of task into buffer. Used in fs/proc/array.c.
187 extern char *task_show_regs(struct task_struct *task, char *buffer);
189 extern void show_registers(struct pt_regs *regs);
190 extern void show_trace(struct task_struct *task, unsigned long *sp);
192 unsigned long get_wchan(struct task_struct *p);
193 #define task_pt_regs(tsk) ((struct pt_regs *) \
194 (task_stack_page(tsk) + THREAD_SIZE) - 1)
195 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
196 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
199 * Give up the time slice of the virtual PU.
201 static inline void cpu_relax(void)
203 if (MACHINE_HAS_DIAG44)
204 asm volatile("diag 0,0,68" : : : "memory");
210 * Set PSW to specified value.
212 static inline void __load_psw(psw_t psw)
215 asm volatile("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
217 asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");
222 * Set PSW mask to specified value, while leaving the
223 * PSW addr pointing to the next instruction.
226 static inline void __load_psw_mask (unsigned long mask)
240 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
241 #else /* __s390x__ */
247 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
248 #endif /* __s390x__ */
252 * Function to stop a processor until an interruption occurred
254 static inline void enabled_wait(void)
256 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
257 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
261 * Function to drop a processor into disabled wait state
264 static inline void disabled_wait(unsigned long code)
266 unsigned long ctl_buf;
269 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
272 * Store status and then load disabled wait psw,
273 * the processor is dead afterwards
278 " ni 0(%2),0xef\n" /* switch off protection */
280 " stpt 0xd8\n" /* store timer */
281 " stckc 0xe0\n" /* store clock comparator */
282 " stpx 0x108\n" /* store prefix register */
283 " stam 0,15,0x120\n" /* store access registers */
284 " std 0,0x160\n" /* store f0 */
285 " std 2,0x168\n" /* store f2 */
286 " std 4,0x170\n" /* store f4 */
287 " std 6,0x178\n" /* store f6 */
288 " stm 0,15,0x180\n" /* store general registers */
289 " stctl 0,15,0x1c0\n" /* store control registers */
290 " oi 0x1c0,0x10\n" /* fake protection bit */
293 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");
294 #else /* __s390x__ */
297 " ni 4(%2),0xef\n" /* switch off protection */
300 " stpt 0x328(1)\n" /* store timer */
301 " stckc 0x330(1)\n" /* store clock comparator */
302 " stpx 0x318(1)\n" /* store prefix register */
303 " stam 0,15,0x340(1)\n"/* store access registers */
304 " stfpc 0x31c(1)\n" /* store fpu control */
305 " std 0,0x200(1)\n" /* store f0 */
306 " std 1,0x208(1)\n" /* store f1 */
307 " std 2,0x210(1)\n" /* store f2 */
308 " std 3,0x218(1)\n" /* store f3 */
309 " std 4,0x220(1)\n" /* store f4 */
310 " std 5,0x228(1)\n" /* store f5 */
311 " std 6,0x230(1)\n" /* store f6 */
312 " std 7,0x238(1)\n" /* store f7 */
313 " std 8,0x240(1)\n" /* store f8 */
314 " std 9,0x248(1)\n" /* store f9 */
315 " std 10,0x250(1)\n" /* store f10 */
316 " std 11,0x258(1)\n" /* store f11 */
317 " std 12,0x260(1)\n" /* store f12 */
318 " std 13,0x268(1)\n" /* store f13 */
319 " std 14,0x270(1)\n" /* store f14 */
320 " std 15,0x278(1)\n" /* store f15 */
321 " stmg 0,15,0x280(1)\n"/* store general registers */
322 " stctg 0,15,0x380(1)\n"/* store control registers */
323 " oi 0x384(1),0x10\n"/* fake protection bit */
326 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");
327 #endif /* __s390x__ */
331 * CPU idle notifier chain.
334 #define CPU_NOT_IDLE 1
336 struct notifier_block;
337 int register_idle_notifier(struct notifier_block *nb);
338 int unregister_idle_notifier(struct notifier_block *nb);
340 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
345 * Helper macro for exception table entries
348 #define EX_TABLE(_fault,_target) \
349 ".section __ex_table,\"a\"\n" \
351 " .long " #_fault "," #_target "\n" \
354 #define EX_TABLE(_fault,_target) \
355 ".section __ex_table,\"a\"\n" \
357 " .quad " #_fault "," #_target "\n" \
361 #endif /* __ASM_S390_PROCESSOR_H */