1 /*
2 * S390 version
3 * Copyright IBM Corp. 1999
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "include/asm-i386/processor.h"
8 * Copyright (C) 1994, Linus Torvalds
9 */
10
11 #ifndef __ASM_S390_PROCESSOR_H
12 #define __ASM_S390_PROCESSOR_H
13
14 #include <linux/const.h>
15
16 #define CIF_MCCK_PENDING 0 /* machine check handling is pending */
17 #define CIF_ASCE 1 /* user asce needs fixup / uaccess */
18 #define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
19 #define CIF_FPU 3 /* restore FPU registers */
20 #define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */
21 #define CIF_ENABLED_WAIT 5 /* in enabled wait state */
22
23 #define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING)
24 #define _CIF_ASCE _BITUL(CIF_ASCE)
25 #define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY)
26 #define _CIF_FPU _BITUL(CIF_FPU)
27 #define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ)
28 #define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT)
29
30 #ifndef __ASSEMBLY__
31
32 #include <linux/linkage.h>
33 #include <linux/irqflags.h>
34 #include <asm/cpu.h>
35 #include <asm/page.h>
36 #include <asm/ptrace.h>
37 #include <asm/setup.h>
38 #include <asm/runtime_instr.h>
39 #include <asm/fpu/types.h>
40 #include <asm/fpu/internal.h>
41
set_cpu_flag(int flag)42 static inline void set_cpu_flag(int flag)
43 {
44 S390_lowcore.cpu_flags |= (1UL << flag);
45 }
46
clear_cpu_flag(int flag)47 static inline void clear_cpu_flag(int flag)
48 {
49 S390_lowcore.cpu_flags &= ~(1UL << flag);
50 }
51
test_cpu_flag(int flag)52 static inline int test_cpu_flag(int flag)
53 {
54 return !!(S390_lowcore.cpu_flags & (1UL << flag));
55 }
56
57 /*
58 * Test CIF flag of another CPU. The caller needs to ensure that
59 * CPU hotplug can not happen, e.g. by disabling preemption.
60 */
test_cpu_flag_of(int flag,int cpu)61 static inline int test_cpu_flag_of(int flag, int cpu)
62 {
63 struct lowcore *lc = lowcore_ptr[cpu];
64 return !!(lc->cpu_flags & (1UL << flag));
65 }
66
67 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
68
69 /*
70 * Default implementation of macro that returns current
71 * instruction pointer ("program counter").
72 */
73 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
74
get_cpu_id(struct cpuid * ptr)75 static inline void get_cpu_id(struct cpuid *ptr)
76 {
77 asm volatile("stidp %0" : "=Q" (*ptr));
78 }
79
80 void s390_adjust_jiffies(void);
81 void s390_update_cpu_mhz(void);
82 void cpu_detect_mhz_feature(void);
83
84 extern const struct seq_operations cpuinfo_op;
85 extern int sysctl_ieee_emulation_warnings;
86 extern void execve_tail(void);
87 extern void __bpon(void);
88
89 /*
90 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
91 */
92
93 #define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
94 (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
95 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
96 (1UL << 30) : (1UL << 41))
97 #define TASK_SIZE TASK_SIZE_OF(current)
98 #define TASK_MAX_SIZE (1UL << 53)
99
100 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
101 #define STACK_TOP_MAX (1UL << 42)
102
103 #define HAVE_ARCH_PICK_MMAP_LAYOUT
104
105 typedef struct {
106 __u32 ar4;
107 } mm_segment_t;
108
109 /*
110 * Thread structure
111 */
112 struct thread_struct {
113 unsigned int acrs[NUM_ACRS];
114 unsigned long ksp; /* kernel stack pointer */
115 mm_segment_t mm_segment;
116 unsigned long gmap_addr; /* address of last gmap fault. */
117 unsigned int gmap_write_flag; /* gmap fault write indication */
118 unsigned int gmap_int_code; /* int code of last gmap fault */
119 unsigned int gmap_pfault; /* signal of a pending guest pfault */
120 struct per_regs per_user; /* User specified PER registers */
121 struct per_event per_event; /* Cause of the last PER trap */
122 unsigned long per_flags; /* Flags to control debug behavior */
123 /* pfault_wait is used to block the process on a pfault event */
124 unsigned long pfault_wait;
125 struct list_head list;
126 /* cpu runtime instrumentation */
127 struct runtime_instr_cb *ri_cb;
128 unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
129 /*
130 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
131 * the end.
132 */
133 struct fpu fpu; /* FP and VX register save area */
134 };
135
136 /* Flag to disable transactions. */
137 #define PER_FLAG_NO_TE 1UL
138 /* Flag to enable random transaction aborts. */
139 #define PER_FLAG_TE_ABORT_RAND 2UL
140 /* Flag to specify random transaction abort mode:
141 * - abort each transaction at a random instruction before TEND if set.
142 * - abort random transactions at a random instruction if cleared.
143 */
144 #define PER_FLAG_TE_ABORT_RAND_TEND 4UL
145
146 typedef struct thread_struct thread_struct;
147
148 /*
149 * Stack layout of a C stack frame.
150 */
151 #ifndef __PACK_STACK
152 struct stack_frame {
153 unsigned long back_chain;
154 unsigned long empty1[5];
155 unsigned long gprs[10];
156 unsigned int empty2[8];
157 };
158 #else
159 struct stack_frame {
160 unsigned long empty1[5];
161 unsigned int empty2[8];
162 unsigned long gprs[10];
163 unsigned long back_chain;
164 };
165 #endif
166
167 #define ARCH_MIN_TASKALIGN 8
168
169 #define INIT_THREAD { \
170 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
171 .fpu.regs = (void *) init_task.thread.fpu.fprs, \
172 }
173
174 /*
175 * Do necessary setup to start up a new thread.
176 */
177 #define start_thread(regs, new_psw, new_stackp) do { \
178 regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \
179 regs->psw.addr = new_psw; \
180 regs->gprs[15] = new_stackp; \
181 execve_tail(); \
182 } while (0)
183
184 #define start_thread31(regs, new_psw, new_stackp) do { \
185 regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \
186 regs->psw.addr = new_psw; \
187 regs->gprs[15] = new_stackp; \
188 crst_table_downgrade(current->mm); \
189 execve_tail(); \
190 } while (0)
191
192 /* Forward declaration, a strange C thing */
193 struct task_struct;
194 struct mm_struct;
195 struct seq_file;
196
197 typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
198 void dump_trace(dump_trace_func_t func, void *data,
199 struct task_struct *task, unsigned long sp);
200
201 void show_cacheinfo(struct seq_file *m);
202
203 /* Free all resources held by a thread. */
204 extern void release_thread(struct task_struct *);
205
206 /*
207 * Return saved PC of a blocked thread.
208 */
209 extern unsigned long thread_saved_pc(struct task_struct *t);
210
211 unsigned long get_wchan(struct task_struct *p);
212 #define task_pt_regs(tsk) ((struct pt_regs *) \
213 (task_stack_page(tsk) + THREAD_SIZE) - 1)
214 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
215 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
216
217 /* Has task runtime instrumentation enabled ? */
218 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
219
current_stack_pointer(void)220 static inline unsigned long current_stack_pointer(void)
221 {
222 unsigned long sp;
223
224 asm volatile("la %0,0(15)" : "=a" (sp));
225 return sp;
226 }
227
stap(void)228 static inline unsigned short stap(void)
229 {
230 unsigned short cpu_address;
231
232 asm volatile("stap %0" : "=m" (cpu_address));
233 return cpu_address;
234 }
235
236 /*
237 * Give up the time slice of the virtual PU.
238 */
239 void cpu_relax(void);
240
241 #define cpu_relax_lowlatency() barrier()
242
243 #define ECAG_CACHE_ATTRIBUTE 0
244 #define ECAG_CPU_ATTRIBUTE 1
245
__ecag(unsigned int asi,unsigned char parm)246 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
247 {
248 unsigned long val;
249
250 asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
251 : "=d" (val) : "a" (asi << 8 | parm));
252 return val;
253 }
254
psw_set_key(unsigned int key)255 static inline void psw_set_key(unsigned int key)
256 {
257 asm volatile("spka 0(%0)" : : "d" (key));
258 }
259
260 /*
261 * Set PSW to specified value.
262 */
__load_psw(psw_t psw)263 static inline void __load_psw(psw_t psw)
264 {
265 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
266 }
267
268 /*
269 * Set PSW mask to specified value, while leaving the
270 * PSW addr pointing to the next instruction.
271 */
__load_psw_mask(unsigned long mask)272 static inline void __load_psw_mask(unsigned long mask)
273 {
274 unsigned long addr;
275 psw_t psw;
276
277 psw.mask = mask;
278
279 asm volatile(
280 " larl %0,1f\n"
281 " stg %0,%O1+8(%R1)\n"
282 " lpswe %1\n"
283 "1:"
284 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
285 }
286
287 /*
288 * Extract current PSW mask
289 */
__extract_psw(void)290 static inline unsigned long __extract_psw(void)
291 {
292 unsigned int reg1, reg2;
293
294 asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
295 return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
296 }
297
local_mcck_enable(void)298 static inline void local_mcck_enable(void)
299 {
300 __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
301 }
302
local_mcck_disable(void)303 static inline void local_mcck_disable(void)
304 {
305 __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
306 }
307
308 /*
309 * Rewind PSW instruction address by specified number of bytes.
310 */
__rewind_psw(psw_t psw,unsigned long ilc)311 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
312 {
313 unsigned long mask;
314
315 mask = (psw.mask & PSW_MASK_EA) ? -1UL :
316 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
317 (1UL << 24) - 1;
318 return (psw.addr - ilc) & mask;
319 }
320
321 /*
322 * Function to stop a processor until the next interrupt occurs
323 */
324 void enabled_wait(void);
325
326 /*
327 * Function to drop a processor into disabled wait state
328 */
disabled_wait(unsigned long code)329 static inline void __noreturn disabled_wait(unsigned long code)
330 {
331 psw_t psw;
332
333 psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
334 psw.addr = code;
335 __load_psw(psw);
336 while (1);
337 }
338
339 /*
340 * Basic Machine Check/Program Check Handler.
341 */
342
343 extern void s390_base_mcck_handler(void);
344 extern void s390_base_pgm_handler(void);
345 extern void s390_base_ext_handler(void);
346
347 extern void (*s390_base_mcck_handler_fn)(void);
348 extern void (*s390_base_pgm_handler_fn)(void);
349 extern void (*s390_base_ext_handler_fn)(void);
350
351 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
352
353 extern int memcpy_real(void *, void *, size_t);
354 extern void memcpy_absolute(void *, void *, size_t);
355
356 #define mem_assign_absolute(dest, val) { \
357 __typeof__(dest) __tmp = (val); \
358 \
359 BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
360 memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
361 }
362
363 extern int s390_isolate_bp(void);
364 extern int s390_isolate_bp_guest(void);
365
366 #endif /* __ASSEMBLY__ */
367
368 #endif /* __ASM_S390_PROCESSOR_H */
369