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)
69 # define TASK_SIZE (0x40000000000UL)
70 # define TASK31_SIZE (0x80000000UL)
71 # define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
72 (TASK31_SIZE / 2) : (TASK_SIZE / 2))
74 #endif /* __s390x__ */
83 struct thread_struct {
85 unsigned int acrs[NUM_ACRS];
86 unsigned long ksp; /* kernel stack pointer */
87 unsigned long user_seg; /* HSTD */
88 mm_segment_t mm_segment;
89 unsigned long prot_addr; /* address of protection-excep. */
90 unsigned int error_code; /* error-code of last prog-excep. */
93 /* Used to give failing instruction back to user for ieee exceptions */
94 unsigned long ieee_instruction_pointer;
95 /* pfault_wait is used to block the process on a pfault event */
96 unsigned long pfault_wait;
99 typedef struct thread_struct thread_struct;
101 #define ARCH_MIN_TASKALIGN 8
104 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE
105 #else /* __s390x__ */
106 # define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE
107 #endif /* __s390x__ */
109 #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \
110 {0},{0},{0},{0},{0},{0}}}, \
111 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, \
112 sizeof(init_stack) + (unsigned long) &init_stack, \
116 (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \
121 * Do necessary setup to start up a new thread.
125 #define start_thread(regs, new_psw, new_stackp) do { \
126 regs->psw.mask = PSW_USER_BITS; \
127 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
128 regs->gprs[15] = new_stackp ; \
131 #else /* __s390x__ */
133 #define start_thread(regs, new_psw, new_stackp) do { \
134 regs->psw.mask = PSW_USER_BITS; \
135 regs->psw.addr = new_psw; \
136 regs->gprs[15] = new_stackp; \
139 #define start_thread31(regs, new_psw, new_stackp) do { \
140 regs->psw.mask = PSW_USER32_BITS; \
141 regs->psw.addr = new_psw; \
142 regs->gprs[15] = new_stackp; \
145 #endif /* __s390x__ */
147 /* Forward declaration, a strange C thing */
151 /* Free all resources held by a thread. */
152 extern void release_thread(struct task_struct *);
153 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
155 /* Prepare to copy thread state - unlazy all lazy status */
156 #define prepare_to_copy(tsk) do { } while (0)
159 * Return saved PC of a blocked thread.
161 extern unsigned long thread_saved_pc(struct task_struct *t);
164 * Print register of task into buffer. Used in fs/proc/array.c.
166 extern char *task_show_regs(struct task_struct *task, char *buffer);
168 extern void show_registers(struct pt_regs *regs);
169 extern void show_trace(struct task_struct *task, unsigned long *sp);
171 unsigned long get_wchan(struct task_struct *p);
172 #define __KSTK_PTREGS(tsk) ((struct pt_regs *) \
173 ((unsigned long) tsk->thread_info + THREAD_SIZE - sizeof(struct pt_regs)))
174 #define KSTK_EIP(tsk) (__KSTK_PTREGS(tsk)->psw.addr)
175 #define KSTK_ESP(tsk) (__KSTK_PTREGS(tsk)->gprs[15])
178 * Give up the time slice of the virtual PU.
181 # define cpu_relax() asm volatile ("diag 0,0,68" : : : "memory")
182 #else /* __s390x__ */
183 # define cpu_relax() \
184 asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory")
185 #endif /* __s390x__ */
188 * Set PSW mask to specified value, while leaving the
189 * PSW addr pointing to the next instruction.
192 static inline void __load_psw_mask (unsigned long mask)
206 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
207 #else /* __s390x__ */
213 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc" );
214 #endif /* __s390x__ */
218 * Function to stop a processor until an interruption occurred
220 static inline void enabled_wait(void)
225 wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
226 PSW_MASK_MCHECK | PSW_MASK_WAIT;
230 "0: la %0,1f-0b(%0)\n"
235 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
237 #else /* __s390x__ */
243 : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
245 #endif /* __s390x__ */
249 * Function to drop a processor into disabled wait state
252 static inline void disabled_wait(unsigned long code)
254 char psw_buffer[2*sizeof(psw_t)];
255 unsigned long ctl_buf;
256 psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
259 dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
262 * Store status and then load disabled wait psw,
263 * the processor is dead afterwards
266 asm volatile (" stctl 0,0,0(%2)\n"
267 " ni 0(%2),0xef\n" /* switch off protection */
269 " stpt 0xd8\n" /* store timer */
270 " stckc 0xe0\n" /* store clock comparator */
271 " stpx 0x108\n" /* store prefix register */
272 " stam 0,15,0x120\n" /* store access registers */
273 " std 0,0x160\n" /* store f0 */
274 " std 2,0x168\n" /* store f2 */
275 " std 4,0x170\n" /* store f4 */
276 " std 6,0x178\n" /* store f6 */
277 " stm 0,15,0x180\n" /* store general registers */
278 " stctl 0,15,0x1c0\n" /* store control registers */
279 " oi 0x1c0,0x10\n" /* fake protection bit */
282 : "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
283 #else /* __s390x__ */
284 asm volatile (" stctg 0,0,0(%2)\n"
285 " ni 4(%2),0xef\n" /* switch off protection */
288 " stpt 0x328(1)\n" /* store timer */
289 " stckc 0x330(1)\n" /* store clock comparator */
290 " stpx 0x318(1)\n" /* store prefix register */
291 " stam 0,15,0x340(1)\n" /* store access registers */
292 " stfpc 0x31c(1)\n" /* store fpu control */
293 " std 0,0x200(1)\n" /* store f0 */
294 " std 1,0x208(1)\n" /* store f1 */
295 " std 2,0x210(1)\n" /* store f2 */
296 " std 3,0x218(1)\n" /* store f3 */
297 " std 4,0x220(1)\n" /* store f4 */
298 " std 5,0x228(1)\n" /* store f5 */
299 " std 6,0x230(1)\n" /* store f6 */
300 " std 7,0x238(1)\n" /* store f7 */
301 " std 8,0x240(1)\n" /* store f8 */
302 " std 9,0x248(1)\n" /* store f9 */
303 " std 10,0x250(1)\n" /* store f10 */
304 " std 11,0x258(1)\n" /* store f11 */
305 " std 12,0x260(1)\n" /* store f12 */
306 " std 13,0x268(1)\n" /* store f13 */
307 " std 14,0x270(1)\n" /* store f14 */
308 " std 15,0x278(1)\n" /* store f15 */
309 " stmg 0,15,0x280(1)\n" /* store general registers */
310 " stctg 0,15,0x380(1)\n" /* store control registers */
311 " oi 0x384(1),0x10\n" /* fake protection bit */
314 : "a" (dw_psw), "a" (&ctl_buf),
315 "m" (dw_psw) : "cc", "0", "1");
316 #endif /* __s390x__ */
321 #endif /* __ASM_S390_PROCESSOR_H */