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
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;
45 unsigned long loops_per_jiffy;
46 unsigned long *pgd_quick;
48 unsigned long *pmd_quick;
49 #endif /* __s390x__ */
50 unsigned long *pte_quick;
51 unsigned long pgtable_cache_sz;
54 extern void print_cpu_info(struct cpuinfo_S390 *);
56 /* Lazy FPU handling on uni-processor */
57 extern struct task_struct *last_task_used_math;
60 * User space process size: 2GB for 31 bit, 4TB for 64 bit.
64 # define TASK_SIZE (0x80000000UL)
65 # define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
66 # define DEFAULT_TASK_SIZE (0x80000000UL)
70 # define TASK_SIZE (test_thread_flag(TIF_31BIT) ? \
71 (0x80000000UL) : (0x40000000000UL))
72 # define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
73 # define DEFAULT_TASK_SIZE (0x40000000000UL)
75 #endif /* __s390x__ */
77 #define MM_VM_SIZE(mm) DEFAULT_TASK_SIZE
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 unsigned long user_seg; /* HSTD */
93 mm_segment_t mm_segment;
94 unsigned long prot_addr; /* address of protection-excep. */
95 unsigned int error_code; /* error-code of last prog-excep. */
98 /* Used to give failing instruction back to user for ieee exceptions */
99 unsigned long ieee_instruction_pointer;
100 /* pfault_wait is used to block the process on a pfault event */
101 unsigned long pfault_wait;
104 typedef struct thread_struct thread_struct;
106 #define ARCH_MIN_TASKALIGN 8
109 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
110 #else /* __s390x__ */
111 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
112 #endif /* __s390x__ */
114 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
115 {0},{0},{0},{0},{0},{0}}}, \
116 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
117 sizeof(init_stack) + (unsigned long) &init_stack, \
121 (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
126 * Do necessary setup to start up a new thread.
130 #define start_thread(regs, new_psw, new_stackp) do { \
131 regs->psw.mask = PSW_USER_BITS; \
132 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
133 regs->gprs[15] = new_stackp ; \
136 #else /* __s390x__ */
138 #define start_thread(regs, new_psw, new_stackp) do { \
139 regs->psw.mask = PSW_USER_BITS; \
140 regs->psw.addr = new_psw; \
141 regs->gprs[15] = new_stackp; \
144 #define start_thread31(regs, new_psw, new_stackp) do { \
145 regs->psw.mask = PSW_USER32_BITS; \
146 regs->psw.addr = new_psw; \
147 regs->gprs[15] = new_stackp; \
150 #endif /* __s390x__ */
152 /* Forward declaration, a strange C thing */
156 /* Free all resources held by a thread. */
157 extern void release_thread(struct task_struct *);
158 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
160 /* Prepare to copy thread state - unlazy all lazy status */
161 #define prepare_to_copy(tsk) do { } while (0)
164 * Return saved PC of a blocked thread.
166 extern unsigned long thread_saved_pc(struct task_struct *t);
169 * Print register of task into buffer. Used in fs/proc/array.c.
171 extern char *task_show_regs(struct task_struct *task, char *buffer);
173 extern void show_registers(struct pt_regs *regs);
174 extern void show_trace(struct task_struct *task, unsigned long *sp);
176 unsigned long get_wchan(struct task_struct *p);
177 #define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
178 ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
179 #define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
180 #define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
183 * Give up the time slice of the virtual PU.
186 # define cpu_relax() asm volatile ("diag 0,0,68" : : : "memory")
187 #else /* __s390x__ */
188 # define cpu_relax() \
189 asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory")
190 #endif /* __s390x__ */
193 * Set PSW mask to specified value, while leaving the
194 * PSW addr pointing to the next instruction.
197 static inline void __load_psw_mask (unsigned long mask)
211 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
212 #else /* __s390x__ */
218 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
219 #endif /* __s390x__ */
223 * Function to stop a processor until an interruption occurred
225 static inline void enabled_wait(void)
230 wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
231 PSW_MASK_MCHECK | PSW_MASK_WAIT;
235 "0: la %0,1f-0b(%0)\n"
240 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
242 #else /* __s390x__ */
248 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
250 #endif /* __s390x__ */
254 * Function to drop a processor into disabled wait state
257 static inline void disabled_wait(unsigned long code)
259 char psw_buffer[2*sizeof(psw_t)];
260 unsigned long ctl_buf;
261 psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
264 dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
267 * Store status and then load disabled wait psw,
268 * the processor is dead afterwards
271 asm volatile (" stctl 0,0,0(%2)\n"
272 " ni 0(%2),0xef\n" /* switch off protection */
274 " stpt 0xd8\n" /* store timer */
275 " stckc 0xe0\n" /* store clock comparator */
276 " stpx 0x108\n" /* store prefix register */
277 " stam 0,15,0x120\n" /* store access registers */
278 " std 0,0x160\n" /* store f0 */
279 " std 2,0x168\n" /* store f2 */
280 " std 4,0x170\n" /* store f4 */
281 " std 6,0x178\n" /* store f6 */
282 " stm 0,15,0x180\n" /* store general registers */
283 " stctl 0,15,0x1c0\n" /* store control registers */
284 " oi 0x1c0,0x10\n" /* fake protection bit */
287 : "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
288 #else /* __s390x__ */
289 asm volatile (" stctg 0,0,0(%2)\n"
290 " ni 4(%2),0xef\n" /* switch off protection */
293 " stpt 0x328(1)\n" /* store timer */
294 " stckc 0x330(1)\n" /* store clock comparator */
295 " stpx 0x318(1)\n" /* store prefix register */
296 " stam 0,15,0x340(1)\n" /* store access registers */
297 " stfpc 0x31c(1)\n" /* store fpu control */
298 " std 0,0x200(1)\n" /* store f0 */
299 " std 1,0x208(1)\n" /* store f1 */
300 " std 2,0x210(1)\n" /* store f2 */
301 " std 3,0x218(1)\n" /* store f3 */
302 " std 4,0x220(1)\n" /* store f4 */
303 " std 5,0x228(1)\n" /* store f5 */
304 " std 6,0x230(1)\n" /* store f6 */
305 " std 7,0x238(1)\n" /* store f7 */
306 " std 8,0x240(1)\n" /* store f8 */
307 " std 9,0x248(1)\n" /* store f9 */
308 " std 10,0x250(1)\n" /* store f10 */
309 " std 11,0x258(1)\n" /* store f11 */
310 " std 12,0x260(1)\n" /* store f12 */
311 " std 13,0x268(1)\n" /* store f13 */
312 " std 14,0x270(1)\n" /* store f14 */
313 " std 15,0x278(1)\n" /* store f15 */
314 " stmg 0,15,0x280(1)\n" /* store general registers */
315 " stctg 0,15,0x380(1)\n" /* store control registers */
316 " oi 0x384(1),0x10\n" /* fake protection bit */
319 : "a" (dw_psw), "a" (&ctl_buf),
320 "m" (dw_psw) : "cc", "0", "1");
321 #endif /* __s390x__ */
325 * CPU idle notifier chain.
328 #define CPU_NOT_IDLE 1
330 struct notifier_block;
331 int register_idle_notifier(struct notifier_block *nb);
332 int unregister_idle_notifier(struct notifier_block *nb);
336 #endif /* __ASM_S390_PROCESSOR_H */