3 * Copyright IBM Corp. 1999
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
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/const.h>
16 #define CIF_MCCK_PENDING 0 /* machine check handling is pending */
17 #define CIF_ASCE_PRIMARY 1 /* primary asce needs fixup / uaccess */
18 #define CIF_ASCE_SECONDARY 2 /* secondary asce needs fixup / uaccess */
19 #define CIF_NOHZ_DELAY 3 /* delay HZ disable for a tick */
20 #define CIF_FPU 4 /* restore FPU registers */
21 #define CIF_IGNORE_IRQ 5 /* ignore interrupt (for udelay) */
22 #define CIF_ENABLED_WAIT 6 /* in enabled wait state */
24 #define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING)
25 #define _CIF_ASCE_PRIMARY _BITUL(CIF_ASCE_PRIMARY)
26 #define _CIF_ASCE_SECONDARY _BITUL(CIF_ASCE_SECONDARY)
27 #define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY)
28 #define _CIF_FPU _BITUL(CIF_FPU)
29 #define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ)
30 #define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT)
34 #include <linux/linkage.h>
35 #include <linux/irqflags.h>
38 #include <asm/ptrace.h>
39 #include <asm/setup.h>
40 #include <asm/runtime_instr.h>
41 #include <asm/fpu/types.h>
42 #include <asm/fpu/internal.h>
44 static inline void set_cpu_flag(int flag)
46 S390_lowcore.cpu_flags |= (1UL << flag);
49 static inline void clear_cpu_flag(int flag)
51 S390_lowcore.cpu_flags &= ~(1UL << flag);
54 static inline int test_cpu_flag(int flag)
56 return !!(S390_lowcore.cpu_flags & (1UL << flag));
60 * Test CIF flag of another CPU. The caller needs to ensure that
61 * CPU hotplug can not happen, e.g. by disabling preemption.
63 static inline int test_cpu_flag_of(int flag, int cpu)
65 struct lowcore *lc = lowcore_ptr[cpu];
66 return !!(lc->cpu_flags & (1UL << flag));
69 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
72 * Default implementation of macro that returns current
73 * instruction pointer ("program counter").
75 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
77 static inline void get_cpu_id(struct cpuid *ptr)
79 asm volatile("stidp %0" : "=Q" (*ptr));
82 void s390_adjust_jiffies(void);
83 void s390_update_cpu_mhz(void);
84 void cpu_detect_mhz_feature(void);
86 extern const struct seq_operations cpuinfo_op;
87 extern int sysctl_ieee_emulation_warnings;
88 extern void execve_tail(void);
91 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
94 #define TASK_SIZE_OF(tsk) ((tsk)->mm ? \
95 (tsk)->mm->context.asce_limit : TASK_MAX_SIZE)
96 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
97 (1UL << 30) : (1UL << 41))
98 #define TASK_SIZE TASK_SIZE_OF(current)
99 #define TASK_MAX_SIZE (1UL << 53)
101 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42))
102 #define STACK_TOP_MAX (1UL << 42)
104 #define HAVE_ARCH_PICK_MMAP_LAYOUT
113 struct thread_struct {
114 unsigned int acrs[NUM_ACRS];
115 unsigned long ksp; /* kernel stack pointer */
116 unsigned long user_timer; /* task cputime in user space */
117 unsigned long guest_timer; /* task cputime in kvm guest */
118 unsigned long system_timer; /* task cputime in kernel space */
119 unsigned long hardirq_timer; /* task cputime in hardirq context */
120 unsigned long softirq_timer; /* task cputime in softirq context */
121 unsigned long sys_call_table; /* system call table address */
122 mm_segment_t mm_segment;
123 unsigned long gmap_addr; /* address of last gmap fault. */
124 unsigned int gmap_write_flag; /* gmap fault write indication */
125 unsigned int gmap_int_code; /* int code of last gmap fault */
126 unsigned int gmap_pfault; /* signal of a pending guest pfault */
127 /* Per-thread information related to debugging */
128 struct per_regs per_user; /* User specified PER registers */
129 struct per_event per_event; /* Cause of the last PER trap */
130 unsigned long per_flags; /* Flags to control debug behavior */
131 unsigned int system_call; /* system call number in signal */
132 unsigned long last_break; /* last breaking-event-address. */
133 /* pfault_wait is used to block the process on a pfault event */
134 unsigned long pfault_wait;
135 struct list_head list;
136 /* cpu runtime instrumentation */
137 struct runtime_instr_cb *ri_cb;
138 unsigned char trap_tdb[256]; /* Transaction abort diagnose block */
140 * Warning: 'fpu' is dynamically-sized. It *MUST* be at
143 struct fpu fpu; /* FP and VX register save area */
146 /* Flag to disable transactions. */
147 #define PER_FLAG_NO_TE 1UL
148 /* Flag to enable random transaction aborts. */
149 #define PER_FLAG_TE_ABORT_RAND 2UL
150 /* Flag to specify random transaction abort mode:
151 * - abort each transaction at a random instruction before TEND if set.
152 * - abort random transactions at a random instruction if cleared.
154 #define PER_FLAG_TE_ABORT_RAND_TEND 4UL
156 typedef struct thread_struct thread_struct;
159 * Stack layout of a C stack frame.
163 unsigned long back_chain;
164 unsigned long empty1[5];
165 unsigned long gprs[10];
166 unsigned int empty2[8];
170 unsigned long empty1[5];
171 unsigned int empty2[8];
172 unsigned long gprs[10];
173 unsigned long back_chain;
177 #define ARCH_MIN_TASKALIGN 8
179 #define INIT_THREAD { \
180 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
181 .fpu.regs = (void *) init_task.thread.fpu.fprs, \
185 * Do necessary setup to start up a new thread.
187 #define start_thread(regs, new_psw, new_stackp) do { \
188 regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \
189 regs->psw.addr = new_psw; \
190 regs->gprs[15] = new_stackp; \
194 #define start_thread31(regs, new_psw, new_stackp) do { \
195 regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \
196 regs->psw.addr = new_psw; \
197 regs->gprs[15] = new_stackp; \
198 crst_table_downgrade(current->mm); \
202 /* Forward declaration, a strange C thing */
208 typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
209 void dump_trace(dump_trace_func_t func, void *data,
210 struct task_struct *task, unsigned long sp);
211 void show_registers(struct pt_regs *regs);
213 void show_cacheinfo(struct seq_file *m);
215 /* Free all resources held by a thread. */
216 extern void release_thread(struct task_struct *);
219 * Return saved PC of a blocked thread.
221 extern unsigned long thread_saved_pc(struct task_struct *t);
223 unsigned long get_wchan(struct task_struct *p);
224 #define task_pt_regs(tsk) ((struct pt_regs *) \
225 (task_stack_page(tsk) + THREAD_SIZE) - 1)
226 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr)
227 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15])
229 /* Has task runtime instrumentation enabled ? */
230 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
232 static inline unsigned long current_stack_pointer(void)
236 asm volatile("la %0,0(15)" : "=a" (sp));
240 static inline unsigned short stap(void)
242 unsigned short cpu_address;
244 asm volatile("stap %0" : "=m" (cpu_address));
249 * Give up the time slice of the virtual PU.
251 #define cpu_relax_yield cpu_relax_yield
252 void cpu_relax_yield(void);
254 #define cpu_relax() barrier()
256 #define ECAG_CACHE_ATTRIBUTE 0
257 #define ECAG_CPU_ATTRIBUTE 1
259 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
263 asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
264 : "=d" (val) : "a" (asi << 8 | parm));
268 static inline void psw_set_key(unsigned int key)
270 asm volatile("spka 0(%0)" : : "d" (key));
274 * Set PSW to specified value.
276 static inline void __load_psw(psw_t psw)
278 asm volatile("lpswe %0" : : "Q" (psw) : "cc");
282 * Set PSW mask to specified value, while leaving the
283 * PSW addr pointing to the next instruction.
285 static inline void __load_psw_mask(unsigned long mask)
294 " stg %0,%O1+8(%R1)\n"
297 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
301 * Extract current PSW mask
303 static inline unsigned long __extract_psw(void)
305 unsigned int reg1, reg2;
307 asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
308 return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
311 static inline void local_mcck_enable(void)
313 __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
316 static inline void local_mcck_disable(void)
318 __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
322 * Rewind PSW instruction address by specified number of bytes.
324 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
328 mask = (psw.mask & PSW_MASK_EA) ? -1UL :
329 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
331 return (psw.addr - ilc) & mask;
335 * Function to stop a processor until the next interrupt occurs
337 void enabled_wait(void);
340 * Function to drop a processor into disabled wait state
342 static inline void __noreturn disabled_wait(unsigned long code)
346 psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
353 * Basic Machine Check/Program Check Handler.
356 extern void s390_base_mcck_handler(void);
357 extern void s390_base_pgm_handler(void);
358 extern void s390_base_ext_handler(void);
360 extern void (*s390_base_mcck_handler_fn)(void);
361 extern void (*s390_base_pgm_handler_fn)(void);
362 extern void (*s390_base_ext_handler_fn)(void);
364 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
366 extern int memcpy_real(void *, void *, size_t);
367 extern void memcpy_absolute(void *, void *, size_t);
369 #define mem_assign_absolute(dest, val) do { \
370 __typeof__(dest) __tmp = (val); \
372 BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \
373 memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
376 #endif /* __ASSEMBLY__ */
378 #endif /* __ASM_S390_PROCESSOR_H */