/* * S390 version * Copyright IBM Corp. 1999 * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Derived from "include/asm-i386/processor.h" * Copyright (C) 1994, Linus Torvalds */ #ifndef __ASM_S390_PROCESSOR_H #define __ASM_S390_PROCESSOR_H #include #define CIF_MCCK_PENDING 0 /* machine check handling is pending */ #define CIF_ASCE 1 /* user asce needs fixup / uaccess */ #define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */ #define CIF_FPU 3 /* restore FPU registers */ #define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */ #define CIF_ENABLED_WAIT 5 /* in enabled wait state */ #define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING) #define _CIF_ASCE _BITUL(CIF_ASCE) #define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY) #define _CIF_FPU _BITUL(CIF_FPU) #define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ) #define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT) #ifndef __ASSEMBLY__ #include #include #include #include #include #include #include #include #include static inline void set_cpu_flag(int flag) { S390_lowcore.cpu_flags |= (1UL << flag); } static inline void clear_cpu_flag(int flag) { S390_lowcore.cpu_flags &= ~(1UL << flag); } static inline int test_cpu_flag(int flag) { return !!(S390_lowcore.cpu_flags & (1UL << flag)); } /* * Test CIF flag of another CPU. The caller needs to ensure that * CPU hotplug can not happen, e.g. by disabling preemption. */ static inline int test_cpu_flag_of(int flag, int cpu) { struct lowcore *lc = lowcore_ptr[cpu]; return !!(lc->cpu_flags & (1UL << flag)); } #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY) /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) static inline void get_cpu_id(struct cpuid *ptr) { asm volatile("stidp %0" : "=Q" (*ptr)); } extern void s390_adjust_jiffies(void); extern const struct seq_operations cpuinfo_op; extern int sysctl_ieee_emulation_warnings; extern void execve_tail(void); /* * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. */ #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ (1UL << 30) : (1UL << 41)) #define TASK_SIZE TASK_SIZE_OF(current) #define TASK_MAX_SIZE (1UL << 53) #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) #define STACK_TOP_MAX (1UL << 42) #define HAVE_ARCH_PICK_MMAP_LAYOUT typedef struct { __u32 ar4; } mm_segment_t; /* * Thread structure */ struct thread_struct { unsigned int acrs[NUM_ACRS]; unsigned long ksp; /* kernel stack pointer */ mm_segment_t mm_segment; unsigned long gmap_addr; /* address of last gmap fault. */ unsigned int gmap_write_flag; /* gmap fault write indication */ unsigned int gmap_pfault; /* signal of a pending guest pfault */ struct per_regs per_user; /* User specified PER registers */ struct per_event per_event; /* Cause of the last PER trap */ unsigned long per_flags; /* Flags to control debug behavior */ /* pfault_wait is used to block the process on a pfault event */ unsigned long pfault_wait; struct list_head list; /* cpu runtime instrumentation */ struct runtime_instr_cb *ri_cb; unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ /* * Warning: 'fpu' is dynamically-sized. It *MUST* be at * the end. */ struct fpu fpu; /* FP and VX register save area */ }; /* Flag to disable transactions. */ #define PER_FLAG_NO_TE 1UL /* Flag to enable random transaction aborts. */ #define PER_FLAG_TE_ABORT_RAND 2UL /* Flag to specify random transaction abort mode: * - abort each transaction at a random instruction before TEND if set. * - abort random transactions at a random instruction if cleared. */ #define PER_FLAG_TE_ABORT_RAND_TEND 4UL typedef struct thread_struct thread_struct; /* * Stack layout of a C stack frame. */ #ifndef __PACK_STACK struct stack_frame { unsigned long back_chain; unsigned long empty1[5]; unsigned long gprs[10]; unsigned int empty2[8]; }; #else struct stack_frame { unsigned long empty1[5]; unsigned int empty2[8]; unsigned long gprs[10]; unsigned long back_chain; }; #endif #define ARCH_MIN_TASKALIGN 8 #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ .fpu.regs = (void *) init_task.thread.fpu.fprs, \ } /* * Do necessary setup to start up a new thread. */ #define start_thread(regs, new_psw, new_stackp) do { \ regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \ regs->psw.addr = new_psw; \ regs->gprs[15] = new_stackp; \ execve_tail(); \ } while (0) #define start_thread31(regs, new_psw, new_stackp) do { \ regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \ regs->psw.addr = new_psw; \ regs->gprs[15] = new_stackp; \ crst_table_downgrade(current->mm); \ execve_tail(); \ } while (0) /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; struct seq_file; typedef int (*dump_trace_func_t)(void *data, unsigned long address); void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task, unsigned long sp); void show_cacheinfo(struct seq_file *m); /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* * Return saved PC of a blocked thread. */ extern unsigned long thread_saved_pc(struct task_struct *t); unsigned long get_wchan(struct task_struct *p); #define task_pt_regs(tsk) ((struct pt_regs *) \ (task_stack_page(tsk) + THREAD_SIZE) - 1) #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) /* Has task runtime instrumentation enabled ? */ #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb) static inline unsigned long current_stack_pointer(void) { unsigned long sp; asm volatile("la %0,0(15)" : "=a" (sp)); return sp; } static inline unsigned short stap(void) { unsigned short cpu_address; asm volatile("stap %0" : "=m" (cpu_address)); return cpu_address; } /* * Give up the time slice of the virtual PU. */ void cpu_relax(void); #define cpu_relax_lowlatency() barrier() static inline void psw_set_key(unsigned int key) { asm volatile("spka 0(%0)" : : "d" (key)); } /* * Set PSW to specified value. */ static inline void __load_psw(psw_t psw) { asm volatile("lpswe %0" : : "Q" (psw) : "cc"); } /* * Set PSW mask to specified value, while leaving the * PSW addr pointing to the next instruction. */ static inline void __load_psw_mask(unsigned long mask) { unsigned long addr; psw_t psw; psw.mask = mask; asm volatile( " larl %0,1f\n" " stg %0,%O1+8(%R1)\n" " lpswe %1\n" "1:" : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); } /* * Extract current PSW mask */ static inline unsigned long __extract_psw(void) { unsigned int reg1, reg2; asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2)); return (((unsigned long) reg1) << 32) | ((unsigned long) reg2); } static inline void local_mcck_enable(void) { __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); } static inline void local_mcck_disable(void) { __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK); } /* * Rewind PSW instruction address by specified number of bytes. */ static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) { unsigned long mask; mask = (psw.mask & PSW_MASK_EA) ? -1UL : (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : (1UL << 24) - 1; return (psw.addr - ilc) & mask; } /* * Function to stop a processor until the next interrupt occurs */ void enabled_wait(void); /* * Function to drop a processor into disabled wait state */ static inline void __noreturn disabled_wait(unsigned long code) { psw_t psw; psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; psw.addr = code; __load_psw(psw); while (1); } /* * Basic Machine Check/Program Check Handler. */ extern void s390_base_mcck_handler(void); extern void s390_base_pgm_handler(void); extern void s390_base_ext_handler(void); extern void (*s390_base_mcck_handler_fn)(void); extern void (*s390_base_pgm_handler_fn)(void); extern void (*s390_base_ext_handler_fn)(void); #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL extern int memcpy_real(void *, void *, size_t); extern void memcpy_absolute(void *, void *, size_t); #define mem_assign_absolute(dest, val) { \ __typeof__(dest) __tmp = (val); \ \ BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \ memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ } #endif /* __ASSEMBLY__ */ #endif /* __ASM_S390_PROCESSOR_H */